Periparturient and Postpartum Endocrine Changes of Conceptus and Maternal Units in Jersey Cows Bred for Milk Yield

D. S. Eley, W. W. Thatcher, H. H. Head, R. J. Collier, C. J. Wilcox, E. P. Call

Research output: Contribution to journalArticle

59 Scopus citations

Abstract

Control cows, sired and bred by bulls of zero estimated breeding value, and selected cows, sired by and bred to bulls of high predicted differences for milk yield, were used to evaluate maternal endocrine changes from 14 days prepartum to 28 days postpartum. Examined were concentrations in plasma of 13, 14 dihydro-15 keto-prostaglandin F2α, progesterone, estrone sulfate, estrone, luteinizing hormone, and prolactin. Ability of cows to release prolactin and luteinizing hormone on day 10 postpartum was evaluated after a simultaneous injection of thyrotropin releasing hormone (100 μg) and gonadtropin releasing hormone (100 μg). Changes in progesterone and estrogens prepartum lead to peak concentrations of prolactin and prostaglandin at parturition and 3 days postpartum, respectively. Higher basal concentrations of prolactin for control cows prepartum were associated with a higher prolactin release by thyrotropin releasing hormone at 10 days postpartum. Although release of luteinizing hormone in response to gonadotropin releasing hormone did not differ between groups on day 10 postpartum, a subsequent increase in progesterone to above 1 ng/ml was earlier and more precisely synchronized among control cows (16 ± .43 versus 23 ± 2.33 days). Within cow concentrations of F2α13, 14 dihydro-15-keto-prostaglandin-F2α were correlated with size of previous gravid uterine horn (.67) and milk yield (−.39). Selection for milk yield influenced postpartum endocrine function.

Original languageEnglish (US)
Pages (from-to)312-320
Number of pages9
JournalJournal of dairy science
Volume64
Issue number2
DOIs
StatePublished - 1981

ASJC Scopus subject areas

  • Food Science
  • Animal Science and Zoology
  • Genetics

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