DOI: 10.1002/vms3.1203 ORIGINAL ARTICLE 24-Hour postnatal total serum protein concentration affects the health and growth performance of female Holstein dairy calves Mitra Aghakhani1 Majid Toghyani1 Amir Davar Foroozandeh Shahraki1 Seyed Nouroldin Tabatabaei1 Erfaneh Moosavi-Zadeh1 Hassan Rafiee2 1 Department of Animal Science, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran Abstract Background: Total serum protein (TSP) within the first few days of life in the neonatal 2 Animal Science Research Department, Isfahan Agriculture and Natural resources Research and Education Center, Agriculture Research, Education and Extension Organization (AREEO), Isfahan, Iran calf has predictive value for subsequent growth and production in calves before and after weaning. Introduction: The objective of this study was to evaluate the effect of TSP concentration 24-h after birth (24-h) on the performance and health of Holstein dairy Correspondence Hassan Rafiee, Animal Science Research Department, Isfahan Agriculture and Natural resources Research and Education Center; Agriculture Research, Education and Extension Organization (AREEO), 8174835117 Isfahan, Iran. Email: [email protected] calves. Methods: A total of 152 female calves were enrolled in this study. Blood samples were collected at 24-h, and TSP concentration was measured with a refractometer. Calves based on TSP concentration at 24-h were allocated into three groups: 1 – TSP ≤6.5 g/dL, 2 – TSP between 6.6 and 6.9 g/dL and 3 – TSP ≥7 g/dL. The weighing was done at birth and at days 30 and 60. Starter feed intake was recorded from day 3 to weaning, and body structures were measured at birth and weaning day. Results: Calves with TSP >6.5 g/dL had greater body weight at days 30 and 60 than calves with TSP ≤6.5 g/dL. Average daily gain during 1–30 and 1–60 days of life increased as TSP increased. Furthermore, starter feed intake during the first 60 days of life was greater in calves with TSP ≥7 g/dL than calves with TSP <7 g/dL. The TSP concentration influenced structural growth, and >6.5 g/dL calves had greater heart girth, hip width and body length than ≤6.5 g/dL calves. Moreover, odds ratio for pneumonia decreased as TSP increased, whereas diarrhoea was unaffected. Conclusion: The TSP at 24-h is an important contributing factor for the variation in growth performance and health of preweaning calves, and strategies to improve calf immunity and increase TSP lead to better animal health during preweaning period. Implications: These results indicated that TSP ≥6.5 g/dL possibly was associated with greater performance, and this concentration could be considered a baseline for future analyses. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. © 2023 The Authors. Veterinary Medicine and Science published by John Wiley & Sons Ltd. 2230 wileyonlinelibrary.com/journal/vms3 Vet Med Sci. 2023;9:2230–2237. KEYWORDS body structures, dairy calves, growth, health, total serum protein 1 INTRODUCTION tration after birth with body weight (BW) and average daily gain (ADG) during the first 21 (Elsohaby et al., 2019) and 180 (Robi- Bovine colostrum is defined as first secretion after parturition and son et al., 1988) days of life in dairy calves. Robison et al. (1988) contains higher protein, immunoglobulins, non-protein nitrogen, fat, reported that mortality of heifer calves through 6 months of age with vitamins and minerals compared to normal milk (Kelly, 2003). Due to FPT was 6.78% compared with 3.33% mortality for calves with ade- the absence of transfer of antibodies by placental blood to the calf dur- quate passive immunity. In addition, calves that survived with FPT ing gestation, the transfer of passive immunity through the absorption failed to grow rapidly through 180 days of age. Furthermore, calf of antibodies from colostrum is essential for neonatal calves. There- serum Ig concentration 24–48 h after birth was a significant source fore, colostrum management and providing high-quality colostrum in of variation in mature milk and fat production, and heifers with FPT proper time and volume are well recognized as vital in preventing had lower milk production during their first lactation (Denise et al., disease during a period that the immune system will gradually acti- 1989). vate in neonatal calves (Godden et al., 2019). Colostrum quality is well In the previous studies, the suggested cut-off values for the FPT defined by immunoglobulin G (IgG) concentration less than 2.0 g/dL as using a refractometer were <5.2 g/dL TSP in healthy calves (Tyler poor quality, 2.0–5.0 g/dL as moderate quality and finally the greater et al., 1996; Windeyer et al., 2014) and <5.5 g/dL TSP in clinically than 5.0 g/dL as excellent quality (Shearer et al., 1992). The current ill calves (McGuirk & Collins, 2004; Tyler et al., 1996). Furthermore, recommendation is the intake of colostrum containing the IgG concen- Donovan et al. (1998), in a large study with 3300 female calves, indi- tration >5.0 g/dL during the first 6–8 h of life. It is well demonstrated cated the lowest risk of calves’ mortality and morbidity until 6 months that colostral IgG concentration will peak approximately 24–36 h after of life was associated with TSP >6.5 g/dL, and suggested this level will feeding colostrum (Hassig et al., 2007). Therefore, if the serum IgG con- be considered the baseline for future analyses. Moreover, Manriquez centration exceeded 1.0 g/dL during that time, calves to be relatively et al. (2018) categorized concentrations of TSP as low (≤6.5 g/dL); well protected against pathogens (McGuirk & Collins, 2004). In a recent medium (6.6–7.4 g/dL); or high (≥7.5 g/dL). Furthermore, Lombard et al. study, four serum IgG categories were proposed including excellent, (2020) reported in a systematic review that calves with TSP ≥6.2 g/dL good, fair and poor with serum IgG levels of ≥2.5, 1.8–2.49, 1.0–1.79 have an excellent transfer of passive immunity. Based on these studies and <1.0 g/dL, respectively (Lombard et al., 2020). These researchers (Donovan et al., 1998; Lombard et al., 2020; Manriquez et al., 2018), showed a reduction in morbidity and mortality rates with increasing it seems that calves with TSP >6.5 g/dL have an excellent transfer of serum IgG levels. passive immunity and lowest risk of mortality and morbidity until 6 Total serum protein (TSP) or IgG concentration within the first few months of life and suggesting that TSP >6.5 g/dL will be considered days of life is the primary indexes for the failure of passive trans- the baseline for future analyses. We categorized concentrations of TSP fer (FPT) (Godden et al., 2019). In the neonatal calf, IgG constitutes a as low (≤6.5 g/dL); medium (6.6–6.9 g/dL); or high (≥7.0 g/dL) for eval- large proportion of the protein in serum. This allows the measurement uating the TSP concentration on calves’ performance in the current of TSP to provide an estimation of serum IgG concentration (Morrill experiment. & Tyler, 2012). The TSP measurement is more practical in farm con- However, to our knowledge, there is limited information about the ditions, as well as highly correlated with blood IgG concentration in association between TSP concentration at 24-h and BW, ADG, starter calves (Thornhill et al., 2015). Many articles used refractometers for feed intake, body structure growth and morbidity in the preweaning measuring the TSP (Cuttance et al., 2019; Hue, Williams, et al., 2021; period for dairy calves. Therefore, this study aimed to assess the effects Hue, Skirving, et al., 2021; Vogels et al., 2013). Hue, Williams et al. of calves’ TSP concentration during the first 24 h after colostrum feed- (2021) reported that serum protein refractometer measurements pre- ing on health, growth performance and starter feed intake of female dicted serum IgG level with high accuracy, providing an on-farm test Holstein dairy calves. to determine that calves have received sufficient passive immunity and colostrum components. Moreover, passive transfer of immunity has predictive value for 2 MATERIALS AND METHODS subsequent growth and production in calves before and after weaning (Denise et al., 1989; Elsohaby et al., 2019; Robinson et al., 1998). The FPT was associated with underdevelopment of the digestive 2.1 Experimental design, cow management and treatments tract and lower feed intake, resulting in reduced growth rates during rearing, and decreased milk production during the first lactation, The experiment was carried out in a large commercial dairy herd, con- compared with calves that had adequate passive immunity (DeNise sisting of 3500 lactating cows in the Isfahan district during autumn et al., 1989; Donovan et al., 1998; Robison et al., 1988). For example, 2018 with mean temperature and relative humidity 7◦ C and 51%, a significant association was indicated between serum IgG concen- respectively. 20531095, 2023, 5, Downloaded from https://onlinelibrary.wiley.com/doi/10.1002/vms3.1203 by Cochrane Mexico, Wiley Online Library on [26/10/2025]. See the Terms and Conditions (https://onlinelibrary.wiley.com/terms-and-conditions) on Wiley Online Library for rules of use; OA articles are governed by the applicable Creative Commons License 2231 AGHAKHANI ET AL. AGHAKHANI ET AL. For this experiment, a total of 152 female Holstein dairy calves Calves were monitored individually twice daily (before milk feed- (39.0 ± 4.7 kg of initial BW), without birth defects, having been deliv- ing) for any signs of ill thrifty, such as weakness, decreased appetite, ered without assistance, and showing a regular respiratory pattern, dehydration, fever, abnormal faecal consistency, increased respiratory were eligible for enrolment. It was suggested in the literature that TSP rate and other lethargy signs. Faeces were scored daily according to ≥6.5 g/dL would be considered the baseline for future analyses, and the the procedure of Habibi et al. (2020) and categorized as firm and well- calves based on TSP concentration at 24 h of life (24-h) were allocated formed (score 1), soft and pudding-like (score 2), runny and pancake into three experimental groups: 1 – TSP concentration ≤6.5 g/dL, 2 – batter (score 3) and liquid and splatters (score 4). A diarrheic calf was TSP concentration between 6.6 and 6.9 g/dL and 3 – TSP concentration considered if the faecal score was ≥3. If having a faecal score ≥3 and ≥7 g/dL. coughing or nasal discharge, the calves were examined by the veteri- The calves were separated within 10 min after birth, not allowed narian to confirm diarrhoea or pneumonia (Habibi et al., 2020). The to suckle on their dams, weighed and moved to individual pens treatment procedures for diarrhoea and pneumonia were applied at (1.22 × 2.44 m) with sawdust bedding. Calves were weighed on an elec- the FKA Milk and Meat Co. (Isfahan). Treatments were discontinued in tronic scale and fed maternal colostrum based on an average of 10% calves that did not respond to the treatment. No animal died during the of their birth weight, approximately 30 min after separation from their study. dam. If all colostrum was not consumed, the remainder was fed 2 h later after birth. According to farm protocol, the colostrum was harvested within 30 min postpartum using a portable milking machine. Colostrum of individual cows was milked into clean buckets and fed to their calves in bottles according to their BW. Colostrum feeding was followed by feeding 3 L of transitional milk per day until day 3. The transitional milk from all dams was pooled and all calves fed transitional milk with similar quality. In the current experiment, transition milk is the milk that cows produce after colostrum during second and third milkings. After that, calves received whole milk (mean composition: 3.6% ± 0.13% fat, 3.2% ± 0.01% CP, 4.8% ± 0.15% lactose and 12.8% ± 0.52% total solids) in galvanized buckets twice daily at 0800 and 1500 h until weaning. All calves were fed 5 L/day of milk from day 4 to 15 and offered 6 L/day of milk from day 16 to 21 of age and then 7 L/day from day 22 to 50 and 4 L/day from day 51–56 and 2 L/day from day 57–60 (total milk offered = 331 L). At day 4, calves were fed starter feed containing 224 g/kg CP, 2.3 Blood sampling and measurements Blood samples were taken approximately at 24-h after birth from the jugular vein into untreated evacuated tubes. The blood samples were centrifuged at 1500 × g for 15 min at 4◦ C, and the serum was analysed using an optical protein refractometer (Instrument-Model PA203; US patent D510880) for total protein. TSP was measured twice using a refractometer, and the mean of these measurements was recorded. Distilled water was used to calibrate the refractometer before each use. Colostrum samples were collected in 50 mL in plain evacuated serum tubes (BD Vacutainer, Becton, Dickinson and Co., Belliver Industrial Estate) per cow for IgG analyses by ELISA sandwich method (Bovine IgG ELISA Bioassay Tech. Lab E0010Bo Kit, assay sensitivity of 1.03 μg/mL and Intra and inter-CV were <8.00% and <10.00%). 39 g/kg ether extract and 11.79 MJ/kg ME on a DM basis prepared as a mashed form. Starter feed was formulated according to CNCPS 2.4 Experimental design and analysis and calves had free access to starter feed by offering an amount that resulted in the residue of 10% of offered feed after 24 h. Through the At first, a linear regression was used to assess the linear relationship experiment, calves had free access to the starter feed and fresh water between TSP concentration at 24-h with performance traits (BW at day from the nipple. 60 and ADG). To evaluate the effect of TSP on calf performance factors (growth traits and starter feed intake) linear mixed model (PROC MIXED) was 2.2 Sampling and measurements used. For traits such as starter feed intake with repetitions during the experiment, they were analysed as repeated measurement. Also, to BW was measured at birth, days 30 and 60 of life about 4 h after morn- estimate the odds ratio of disorders due to differences in TSP at 24- ing milk feeding. Starter refusals were recorded and renewed every h used a logistic regression model with PROC GLIMMIX assumed a day at 10:00 AM. The starter feed intake of each calf was calculated binary distribution with the logit link function. All statistical analysis from the difference between the daily starter feed that was offered and was conducted using the SAS/STAT 9.4 (SAS Institute Inc.). Addition- refused. Means of ADG were determined. ally, the differences among the treatments were evaluated using a Body measurements of each calf include body length (distance multiple comparison test following the Tukey–Kramer method. Sta- between the points of shoulder and rump), withers height (distance tistical significance of any main effect was declared at p ≤ 0.05. The from the base of the front feet to the withers), body barrel (circum- statistical model used for the analyses was as follows: ference of the belly before feeding), heart girth (circumference of the chest), hip height (distance from the base of the rear feet to hook bones) and hip-width (distance between the points of hook bones) were mea- Yijklm = μ + TPi + Periodj + β1 × Bweightk + β2 × Bstral + Calfm + TPi × Periodj + eijklm sured with calipers at the birth and weaning (day 60) according to the where Yijklm is the dependent variable (weight as continuous; disor- method described by Mirzakhani et al. (2021). ders as binomial trait; starter feed intake as continuous; and structure 20531095, 2023, 5, Downloaded from https://onlinelibrary.wiley.com/doi/10.1002/vms3.1203 by Cochrane Mexico, Wiley Online Library on [26/10/2025]. See the Terms and Conditions (https://onlinelibrary.wiley.com/terms-and-conditions) on Wiley Online Library for rules of use; OA articles are governed by the applicable Creative Commons License 2232 TA B L E 1 Descriptive statistics for 152 Holstein calves enrolled in the current study. Items Mean (± SD) Minimum Total serum protein at 24 h (g/dL) 6.7 ± 0.6 5.3 Maximum 8.9 Colostrum’s IgG (mg/mL) 84.1 ± 15.0 45.2 116.5 Birth weight (kg) 39.0 ± 4.7 25.0 50.0 Body weight at day 30 (kg) 48.3 ± 7.4 33.0 69.0 Body weight at day 60 (kg) 70.9 ± 10.1 41.0 91.0 TA B L E 2 Results of the final linear relationship for serum total protein and calves’ growth performance. Variables Estimate (± SE) p Value Body weight at 60 day (kg) Intercept 27.00 ± 7.80 0.007 Total serum protein 6.53 ± 1.15 <0.001 Intercept 603.61 ± 162.25 0.003 Total serum protein 23.04 ± 14.61 0.04 Average daily gain (g/day) F I G U R E 1 Distribution of total serum protein concentration (g/dL) at 24 h of life of 152 female Holstein calves. growth traits as continuous); TPi is the TSP at 24-h (three levels; 1: ≤6.5 g/dL; 2: between 6.5 and 6.9 g/dL; and 3: ≥7.0 g/dL) as an independent variable, periodj is the measurement time, β1 and β2 are regression coefficient for birth weight and birth structure traits (e.g. heart girth and withers height) and Bweightk and Bstral are covariates of birth weight and birth structure, respectively, TPi × periodj is the interaction of TSP and measurement time, Calfm is the random effect of calf and eijkl is the random residual error. 3 RESULTS F I G U R E 2 Starter feed intake during the first 8 weeks of life with three levels of total serum protein (TSP) at 24 h of life. Results of descriptive analysis for TSP concentration at 24-h, life increased as TSP increased, whereas ADG was greater during 30– colostrum’s IgG concentration, birth weight and BW at days 30 60 days of life in calves with TSP ≥7 g/dL than calves with TSP <7 g/dL. and 60 of Holstein dairy calves are presented in Table 1. TSP con- Moreover, starter feed intake during the first 60 day of life was greater centration at 24-h ranged from 5.3 to 8.9 g/dL, colostrum’s IgG in calves with TSP ≥7 g/dL than calves with TSP <7 g/dL, and there concentration ranged from 45.2 to 116.5 mg/mL, birth weight ranged was no significant difference between calves with TSP ≤6.5 g/dL and from 25 to 50 kg, BW at day 30 ranged from 33 to 69 kg and BW between 6.6 and 6.9 g/dL (Figure 2). at day 60 ranged from 41 to 91 kg. Furthermore, the distribution of The results of structural growth are listed in Table 4. The TSP at 24- TSP concentration at 24-h of 152 calves used in the current study is h influenced structural growth, and >6.5 g/dL calves had greater heart presented in Figure 1. girth, hip width and body length than ≤6.5 g/dL calves. Body barrel The results of linear regression analysis between TSP and calf was greater in ≥7.0 g/dL calves than ≤6.5 g/dL calves, but 6.6–6.9 g/dL growth performance showed that for each unit increase of TSP, the was not different from ≥7.0 to ≤6.5 calves. Moreover, increasing TSP final weight of the calf increased by 6.53 kg (CI: 3.86–7.91; p < 0.001), increased withers height and hip height. and ADG increased by 23 g/day (CI: 16.9–26.8; p = 0.04, Table 2). Moreover, odds ratio for pneumonia between birth and weaning As shown in Table 3, calves with TSP >6.5 g/dL at 24-h had greater decreased as TSP increased (Table 5). The TSP concentration at 24- BW at 30 (p = 0.001) and 60 (p = 0.001) day of life than calves with TSP h had no significant effect on the incidence risk of diarrhoea in dairy ≤6.5 g/dL at 24-h. Furthermore, ADG during 1–30 and 1–60 days of calves. 20531095, 2023, 5, Downloaded from https://onlinelibrary.wiley.com/doi/10.1002/vms3.1203 by Cochrane Mexico, Wiley Online Library on [26/10/2025]. See the Terms and Conditions (https://onlinelibrary.wiley.com/terms-and-conditions) on Wiley Online Library for rules of use; OA articles are governed by the applicable Creative Commons License 2233 AGHAKHANI ET AL. AGHAKHANI ET AL. TA B L E 3 Least squares means (± SE) for the effects of total serum protein at 24 h of life on starter feed intake, average daily gain, feed efficiency and body weight of dairy calves. total serum protein at 24 h of life (g/dL) ≤6.5 Items ≥7.0 6.6–6.9 p Value Birth body weight (kg) 38.7 ± 0.45 39.4 ± 0.53 39.9 ± 0.53 0.11 Body weight at day 30 (kg) 45.63 ± 0.49b 49.70 ± 0.50a 50.20 ± 0.56a 0.001 Body weight at day 60 (kg) 69.31 ± 0.90b 71.38 ± 1.04a 72.83 ± 1.02a 0.001 1–30 days 220.6 ± 16.7c 355.9 ± 19.2b 373.1 ± 18.2a 0.001 31–60 days 754.7 ± 25.4 b 723.5 ± 28.9 b 789.5 ± 29.9 a 0.04 1–60 days 505.0 ± 15.0c 539.5 ± 17.0b 563.7 ± 17.0a 0.04 1–30 days 461.4 ± 14.2b 456.1 ± 16.6b 536.5 ± 15.0a 0.003 31–60 days 2067.9 ± 33.0b 2073.5 ± 39.0b 2282.0 ± 36.0a 0.001 1–60 days 1264.6 ± 18.4 1264.5 ± 21.9 1409.0 ± 20.9 0.001 Average daily gain (g/day) Starter feed intake (g/day) a-c b b a Means within a row with different superscripts are significantly different (p < 0.05). TA B L E 4 days of life. Least squares means (± SE) for the effects of total serum protein at 24 h on body structures measurements (cm) of dairy calves at 60 Total serum protein at 24 h (g/dL) Items ≤6.5 Heart girth 96.32 ± 0.61 ≥7.0 6.6–6.9 b 98.81 ± 0.41 a 108.10 ± 0.92 ab p Value 99.82 ± 0.68 a 0.001 109.61 ± 0.89 a 0.001 Body barrel 106.07 ± 0.7 Withers height 84.21 ± 0.40c 85.94 ± 0.46b 87.74 ± 0.44a 0.001 Hip height 88.88 ± 0.42 c 91.09 ± 0.49 b 92.57 ± 0.47 0.003 Hip width 14.42 ± 0.16b 16.71 ± 0.19a 16.90 ± 0.18a 0.01 Body length 51.61 ± 0.40 53.08 ± 0.46 53.73 ± 0.44 0.001 a-c b b a a a Means within a row with different superscripts are significantly different (p < 0.05). TA B L E 5 Estimated odds ratios (95% CI) for the effects of total serum protein at 24 h on diarrhoea and pneumonia of dairy calves during first 60 days of life. Total serum protein at 24 h (g/dL) ≤6.5 6.6–6.9 ≥7.0 p Value Incidence risk (%) 55.17 55.80 50.0 0.42 OR (± CI) Reference 0.98 (0.67–1.19) 0.78 (0.50–1.21) Incidence risk (%) 10.34a 3.42b 1.60c OR (± CI) Reference 0.13 (0.04–0.47) 0.05 (0.01–0.20) Disorders Diarrhoea Pneumonia a-c 4 0.001 Means within a row with different superscripts are significantly different (p < 0.05). DISCUSSION tural growth and health in preweaning dairy calves. This study demonstrated that TSP concentrations at 24-h <6.5 g/dL were associated with The objective of this study was to investigate the association between increased calf morbidity and reduced ADG, BW, structural growth and TSP at 24-h and growth performance, starter feed intake, body struc- starter feed intake during the preweaning period. Furthermore, these 20531095, 2023, 5, Downloaded from https://onlinelibrary.wiley.com/doi/10.1002/vms3.1203 by Cochrane Mexico, Wiley Online Library on [26/10/2025]. See the Terms and Conditions (https://onlinelibrary.wiley.com/terms-and-conditions) on Wiley Online Library for rules of use; OA articles are governed by the applicable Creative Commons License 2234 results suggested that TSP >6.5 g/dL could be considered a new base- gut fill and increased weights of gastrointestinal tissues not the frame line for future analyses. In the present study, the TSP concentrations size of body (Khan et al., 2011). Calves are expected to increase in BW were measured by a refractometer. Many articles used refractome- concomitantly with structural growth, and skeletal growth is equally ters for measuring the TSP (Cuttance et al., 2019; Hue, Williams, et al., important function to consider because those body dimensions are not 2021; Vogels et al., 2013; Hue, Skirving, et al., 2021). Hue, Williams often influenced by body condition, degree of fatness or gut fill (Hein- et al. (2021) reported that serum protein refractometer measurements richs et al., 1992). Because 50% of withers height increase occurs in the predicted serum IgG level with high accuracy, providing an on-farm test first 6 months of life (Kertz et al., 1998), we anticipated that the calves to determine that calves have received sufficient passive immunity and with greater TSP g/dL would gain faster than calves with TSP <6.5 g/dL colostrum components. in both BW and frame size. Although mature body size is determined The TSP concentration at 24-h positively influenced days 30 and 60 by genetic potential, but diet and health status can result in animals BW, day 60 body structure growth and ADG from birth to day 60. These achieving that genetic potential earlier or being retarded in growth results suggest that passive transfer status significantly affects growth and never achieving their maximal mature size (Owens et al., 1993). performance during the first month of life (Mastellone et al., 2011). In Thus, the increased structural growth of calves with TSP greater than agreement with our finding, Mastellone et al. (2011) detected signifi- 6.5 g/dL might be the result of additional energy and nutrients available cant linear associations between serum Ig concentration at 24-h and for skeletal deposition due to the increase in DMI and these calves may BW at day 30 and ADG from birth to day 30 in buffalo calves. Moreover, have the potential to achieve structural maturity at a younger age. a significant association was indicated between serum IgG concentra- Calves fed adequate colostrum immunoglobulin may develop and tion after birth with BW and ADG during the first 21 (Elsohaby et al., grow normally, as opposed to calves with failure of transfer of pas- 2019) and 180 (Robison et al., 1988) days of life in dairy calves. More- sive immunity, which have decreased nutrient utilization and reduced over, Cuttance et al. (2018) showed that the weaning weights increased feed intake (Colditz, 2004; Massimini et al., 2007). A meta-analysis by by 0.4 kg for every 1.0 g/dL increase in TSP concentration. Stefańska Soberon et al. (2012) found that every kg increase in preweaning ADG et al. (2021) reported that BW was associated with initial TSP con- and could increase the first lactation milk yield by 1550 kg. It could be centration between 24 and 48 h after birth, and calves with greater hypothesized that manipulation of heifer TSP level may offer a viable TSP had greater BW and ADG until day 450 of life. Furman-Fratczak method of increasing first lactation milk yield through greater starter et al. (2011) stated that TSP levels did not affect ADG for the first 6 feed intake, ADG and body structural growth during the preweaning months, but claves with greater TSP levels had greater ADG between period. In agreement with our results, Stefańska et al. (2021) showed 12 and 15 months of life and achieved BW allowing first insemina- that the initial TSP concentration of dairy heifers was associated with tion 17 day sooner. The increase in ADG and BW of calves possibly greater withers height and lower age at first oestrus, artificial insem- is attributed to greater starter feed intake in the current study. Thus, ination service, pregnancy and calving and improvement actual and improving colostrum management practices in dairy farms and greater energy-corrected milk during first lactation. TSP in calves could increase starter feed intake and ADG. Starter feed Calfhood diseases have a major impact on the economic viability of intake is an important factor for ruminal development and minimizing dairy cow operations, due to the direct costs of calf losses and treat- weaning BW slump and stress, and for adapting to future solid diets, ment and the long-term effects on performance. The lower incidence which could also directly influence future performance (Silva et al., of diseases due to greater TSP concentration was expected because of 2019). Moreover, colostrum is a source of hormones and growth fac- the great impact of colostrum-derived immune cells on calves’ health. tors, including insulin, IGF-I, IGF-II, epidermal growth factor, growth Many of non-immunoglobulin factors in colostrum (i.e. cytokines, GH hormone, adiponectin and leptin (Bach, 2012). These factors promote and IGF-1) might have interacted with Ig concentration or acted the development of the gastrointestinal tract and the production of directly to influence the growth response or to advance the immune digestive enzymes (Guilloteau et al., 1997). Therefore, the adequacy and metabolic systems of the dairy calves (Hagiwara et al., 2000; Reber of colostrum and IgG intake has both short- and long-term effects on et al., 2005). The same significant association was reported in previ- dairy calves (Shivley et al., 2018) and probably influence their future ous studies (Nocek et al., 1984; Robison et al., 1988; Virtala et al., growth rate, fertility and milk production. On the other hand, it was 1996). Cuttance et al. (2018a) reported that calves with TSP <5.2 g/dL reported that ADG reduced by 0.067 kg/day in calves experienced calf- had 1.68 times higher odds of experiencing a farmer-recorded ani- hood respiratory disease (Buczinski et al., 2021) and calves with lower mal health event between birth and weaning. In agreement with our TSP concentration experienced more pneumonia in the current study. results, Donovan et al. (1998) and Stefańska et al. (2021) noted TSP To our knowledge, this is the first experiment that examines the was not associated with incidence, age of onset or severity of diar- effect of TSP at 24-h on preweaning starter feed intake and body struc- rhoea. However, pneumonia was strongly associated with TSP during tural growth. Calves fed greater starter feed received more energy the first 6 months (Donovan et al., 1998). Virtala et al. (1996) reported and protein, resulting in greater ADG and body structure. Generally, that each additional week of pneumonia reduced total BW gain and starter feed is an important part of a preweaned calf’s diet, and the total height gain during the first 3 months of life by 0.8 kg and 0.2 cm, aim is that the calf is consuming enough starter to sustain a good ADG respectively. Moreover, higher mean haptoglobin levels and higher and body growth during the preweaning period. However, there is a intensity and frequency of respiratory and gastrointestinal tract mor- common concern that an increase in BW can be attributed to greater bidity were observed in the calves with lower Ig levels at 30–60 h 20531095, 2023, 5, Downloaded from https://onlinelibrary.wiley.com/doi/10.1002/vms3.1203 by Cochrane Mexico, Wiley Online Library on [26/10/2025]. See the Terms and Conditions (https://onlinelibrary.wiley.com/terms-and-conditions) on Wiley Online Library for rules of use; OA articles are governed by the applicable Creative Commons License 2235 AGHAKHANI ET AL. AGHAKHANI ET AL. of life (Furman-Fratczak et al., 2011). An increase in haptoglobin con- ETHICS STATEMENT centration is commonly related to the intensity of an inflammatory Guidelines for the care and use of animals were approved by the Iranian reaction (Heegaard et al., 2000). Probably calves with greater TSP have Council of Animal Care (1995). The authors confirm that the ethical a greater capacity to inactivate pathogenic invasion and mount an ear- policies of the journal, as noted on the journal’s author guidelines page, lier response than calves with lower TSP; the latter must mount an have been adhered to and the appropriate ethical review committee acquired humoral immune response for defence (Elsohaby et al., 2019). approval has been received. The authors confirm that they have fol- Prevention of diseases (such as pneumonia) in the early life of dairy lowed EU standards for the protection of animals used for scientific calves by increasing the TSP level may improve ADG and structural purposes. growth of calves. Together, our results and previous studies indicate that strategies to improve calf immunity and increase TSP lead to bet- DATA AVAILABILITY STATEMENT ter animal health during the preweaning period, irrespective of the The data that support the findings of this study are available from the dairy management system. corresponding author upon reasonable request. The initial feeding (colostrum and transitional milk quality and quantity) is an important factor in calf performance and health. In the ORCID present study, the calves received their dam’s colostrum at the rate of Majid Toghyani https://orcid.org/0000-0003-0470-856X 10% of their BW. In the following, the calves received similar transi- Hassan Rafiee https://orcid.org/0000-0002-4230-2598 tion milk, whole milk and the starter feed, and it could be noted that the most important factor affecting the difference in TSP level was PEER REVIEW the quality of colostrum consumed. The colostrum’s IgG concentration The peer review history for this article is available at https://publons. ranged from 4.52 to 11.65 g/dL. In agreement, Immler et al. (2022) com/publon/10.1002/vms3.1203. and Turini et al. (2020) reported TSP increased in association with an increase in the Brix percentage of the colostrum administered to REFERENCES the calves and calves being fed colostrum with higher Brix values had Bach, A. (2012). Optimizing performance of the offspring: Nourishing and managing the dam and postnatal calf for optimal lactation, reproduction, and immunity. Journal of Animal Science, 90, 1835–1845. Buczinski, S., Achard, D., & Timsit, E. (2021). Effects of calfhood respiratory disease on health and performance of dairy cattle: A systematic review and meta-analysis. Journal of Dairy Science, 104, 8214–8227. Colditz, I. G. (2004). Some mechanisms regulating nutrient utilisation in livestock during immune activation: An overview. 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Veterinary Medicine and Science, 9, 2230–2237. https://doi.org/10.1002/vms3.1203 20531095, 2023, 5, Downloaded from https://onlinelibrary.wiley.com/doi/10.1002/vms3.1203 by Cochrane Mexico, Wiley Online Library on [26/10/2025]. See the Terms and Conditions (https://onlinelibrary.wiley.com/terms-and-conditions) on Wiley Online Library for rules of use; OA articles are governed by the applicable Creative Commons License 2237 AGHAKHANI ET AL.
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