Effects of heat stress during pregnancy on postpartum reproductive changes in Holstein cows

Journal of Animal Science
G S LewisR J Collier

Abstract

Effects of heat stress during the last third of gestation on reproductive changes postpartum were studied in Holstein cows. Cows and heifers 160 to 190 d of gestation were assigned in June 1978 to shade (n = seven cows and two heifers) or no shade (n = eight cows and two heifers) management treatments. After parturition, all cows (n = 19) were moved to the milking herd and managed uniformly. On the day of calving and on each Monday, Wednesday and Friday thereafter until d 50 postpartum, jugular blood samples were collected. Beginning approximately 7 d postpartum, the reproductive tract of each cow was examined rectally after collection of blood samples. Estrus was monitored twice daily and cows were inseminated after d 45 postpartum. Prepartum heat stress increased 13,14-dihydro-15-keto-prostaglandin F2 alpha (PGFM) concentrations postpartum and increased the rate of uterine involution. Regardless of prepartum treatment, progesterone concentrations indicated that luteal phases had begun by d 12.4 +/- 1.3 postpartum, which was about 3 d before PGFM was basal. The first luteal phase lasted only 10.7 +/- .9 d. First estrus was not detected until d 32.3 +/- 4.8 postpartum. The previously gravid uterine horn had a negative effect on...Continue Reading

Citations

Nov 21, 2017·Journal of Dairy Science·R J CollierY Xiao
Sep 9, 2020·Journal of Dairy Science·P PinedoW W Thatcher
Jun 1, 1985·Journal of Dairy Science·F C Gwazdauskas
Nov 8, 2017·Reproduction in Domestic Animals = Zuchthygiene·O AarifA A Sheikh
Jan 1, 1987·Veterinary Research Communications·F N ThompsonA B Caudle
Jan 26, 2016·Journal of Dairy Science·G E DahlA P A Monteiro
Sep 16, 2000·Theriogenology·Y Yavas, J S Walton

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