Effects of spring- versus fall-calving on perinatal nutrient availability and neonatal vigor in beef cattle.

Autor:	Wichman LG; Division of Animal Sciences, University of Missouri, Columbia, MO 65211, USA., Redifer CA; Division of Animal Sciences, University of Missouri, Columbia, MO 65211, USA., Rathert-Williams AR; Division of Animal Sciences, University of Missouri, Columbia, MO 65211, USA., Duncan NB; Division of Animal Sciences, University of Missouri, Columbia, MO 65211, USA., Payne CA; Department of Veterinary Extension and Continuing Education, University of Missouri, Columbia, MO 65211, USA., Meyer AM; Division of Animal Sciences, University of Missouri, Columbia, MO 65211, USA.
Jazyk:	angličtina
Zdroj:	Translational animal science [Transl Anim Sci] 2022 Oct 01; Vol. 6 (4), pp. txac136. Date of Electronic Publication: 2022 Oct 01 (Print Publication: 2022).
DOI:	10.1093/tas/txac136
Abstrakt:	To determine the effect of calving season on perinatal nutrient availability and neonatal beef calf vigor, data were collected from 4 spring- (average calving date: February 14; n = 203 total) and 4 fall- (average calving date: September 20; n = 179 total) calving experiments. Time to stand was determined as minutes from birth to standing for 5 s. After birth, calf weight and size (length, heart and abdominal girth, and cannon circumference) were recorded. Jugular blood samples and rectal temperatures were obtained at 0, 6, 12, and 24 h postnatally in 6 experiments and at 48 h postnatally in Exp. 2 to 8. Data were analyzed with fixed effects of season (single point) or season, hour, and their interaction (over time, using repeated measures). Experiment was a random effect; calf sex was included when P ≤ 0.25. Within calving season, correlations were determined between calf size, vigor, and 48-h serum total protein. Fall-born calves tended to have lighter ( P = 0.09) birth weight and faster ( P = 0.05) time to stand than spring-born calves. Season did not affect ( P ≥ 0.18) gestation length, other calf size measures, or 48-h serum total protein. Fall-born calves had greater ( P ≤ 0.003) rectal temperature at 0, 24, and 48 h postnatal. Spring-born calves had greater ( P ≤ 0.009) circulating glucose at 0 h, serum non-esterified fatty acids at 0 and 6 h, and plasma triglycerides at 0, 6, 12, and 48 h. Fall-born calves had greater ( P ≤ 0.03) sodium from 6 to 48 h and magnesium from 0 to 24 h of age. Phosphorus was greater ( P ≤ 0.02) at 6 and 12 h of age in spring-born calves. Spring-born calves had greater ( P ≤ 0.04) aspartate aminotransferase at 12 and 24 h and creatine kinase at 0 and 12 h of age. Fall-born calves had greater ( P ≤ 0.03) albumin, calcium, and chloride, had lower ( P ≤ 0.03) bicarbonate and direct bilirubin, and tended to have greater ( P = 0.10) anion gap (all main effects of calving season). Calf birth weight had a weak positive relationship ( P ≤ 0.03) with 48-h serum total protein and time to stand in fall-born, but not spring-born, calves. Overall, fetal growth was restricted and neonatal dehydration was increased by warm conditions for fall-born calves, but vigor and metabolism were negatively affected by cold conditions in spring-born calves. These data suggest that calving season influences perinatal nutrient availability, which may impact the transition of beef calves to postnatal life. (© The Author(s) 2022. Published by Oxford University Press on behalf of the American Society of Animal Science.)
Databáze:	MEDLINE
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