Periparturient endocrine changes of conceptus and maternal units in Jersey cows bred for milk yield.

D. S. Eley, W. W. Thatcher, H. H. Head, Robert J Collier, C. J. Wilcox

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Control cows, sired by and bred to bulls with assumed zero estimated breeding values, and selected cows, sired by and bred to bulls of high predicted difference for milk yield, were used. Blood samples were collected via jugular venipuncture on alternate days from 35 to 14 days prepartum, from 14 to 28 days postpartum, and daily from 14 days prepartum to 14 days postpartum. We examined blood hematocrit, and concentrations in plasma of protein, estrone, estradiol, estrone sulfate, progestins, glucocorticoids, luteinizing hormone, and prolactin. Total plasma volume was measured on days -21, -7, and +11. Weekly body weights, prepartum and postpartum, were recorded. All data were analyzed by least squares analysis of variance with day and hematocrit as continuous independent variables. Hematocrit was higher for selected cows throughout the sampling period. Prepartum concentrations of progesterone were higher in selected cows, but concentrations of estrone, luteinizing hormone, and prolactin were lower than in control cows. Hormonal and physiological responses indicated that selection for milk yield influenced both the conceptus and maternal units as measured by prepartum endocrine function.

Original languageEnglish (US)
Pages (from-to)296-311
Number of pages16
JournalJournal of Dairy Science
Volume64
Issue number2
StatePublished - Feb 1981
Externally publishedYes

Fingerprint

conceptus
Jersey
Hematocrit
Postpartum Period
milk yield
Milk
Estrone
Mothers
estrone
Luteinizing Hormone
breeds
cows
Prolactin
hematocrit
luteinizing hormone
prolactin
Phlebotomy
Plasma Volume
Progestins
Least-Squares Analysis

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Food Science
  • veterinary(all)

Cite this

Periparturient endocrine changes of conceptus and maternal units in Jersey cows bred for milk yield. / Eley, D. S.; Thatcher, W. W.; Head, H. H.; Collier, Robert J; Wilcox, C. J.

In: Journal of Dairy Science, Vol. 64, No. 2, 02.1981, p. 296-311.

Research output: Contribution to journalArticle

Eley, D. S. ; Thatcher, W. W. ; Head, H. H. ; Collier, Robert J ; Wilcox, C. J. / Periparturient endocrine changes of conceptus and maternal units in Jersey cows bred for milk yield. In: Journal of Dairy Science. 1981 ; Vol. 64, No. 2. pp. 296-311.
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