Relationship of Early Lactation and Bovine Somatotropin on Nutrient Uptake by Cow Mammary Glands

P. S. Miller, B. L. Reis, C. C. Calvert, E. J. DePeters, R. L. Baldwin

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Twenty-one multiparous lactating dairy cows with previous 305-d milk production records varying from 5900 to 13,600 kg were used to investigate effects of bST administration and stage of lactation on nutrient plasma arterial concentrations and arterial-venous differences across the mammary glands (uptake). On d 71 and continuing until d 126 of lactation, cows were injected with 40 mg of sometribove (bST group) or bicarbonate buffer (placebo group). Arterial and venous blood plasma samples were collected over a 12-h period on d 35, 70, 105, and 126 of lactation. Plasma concentration of glucose was 7% higher in midlactation compared with early lactation cows. Plasma concentration of acetate decreased from 2.11 to 1.87 mM in placebo versus bST-treated cows. Plasma arterial concentration and uptake of D-β-hydroxybutyrate were .52 and .18 mM higher, respectively, in early versus midlactation cows. Concentration and uptake of NEFA were elevated in both early lactation and bST-treated cows. Triacylglyceride concentrations were 24 and 19% lower in early lactation and bST-treated cows compared with midlactation cows receiving placebo. Likewise, uptake of triacylglyceride was reduced in early lactation and with bST treatment compared with midlactation. The mediation of nutrient delivery and uptake by the mammary gland appears to be markedly similar between early lactation and bST-treated cows, suggesting a similarity between these physiological states and the homeostatic and homeorhetic mechanisms regulating nutrient partitioning in the lactating dairy cow. In early compared with midlactation cows receiving placebo, uptakes of D-β-hydroxybutyrate and NEFA were reduced, and triacylglyceride uptake increased.

Original languageEnglish (US)
Pages (from-to)3800-3806
Number of pages7
JournalJournal of Dairy Science
Volume74
Issue number11
DOIs
StatePublished - Jan 1 1991

Fingerprint

Human Mammary Glands
early lactation
Lactation
mammary glands
nutrient uptake
somatotropin
cows
uptake mechanisms
placebos
Placebos
Hydroxybutyrates
Nonesterified Fatty Acids
Food
dairy cows
lactation
nutrient partitioning
bovine growth hormone
Bicarbonates
nutrients
lactation stage

Keywords

  • AVD
  • D-P-hydroxybutyrate
  • FCHOL
  • IL
  • PAC
  • PHBA
  • TAG
  • TCHOL
  • VLDL
  • arterial-venous difference
  • dairy cow
  • free cholesterol
  • irreversible loss
  • nutrient uptake
  • plasma arterial concentration
  • somatotropin
  • total cholesterol
  • triacylglyceride
  • very low density lipoprotein

ASJC Scopus subject areas

  • Food Science
  • Animal Science and Zoology
  • Genetics

Cite this

Relationship of Early Lactation and Bovine Somatotropin on Nutrient Uptake by Cow Mammary Glands. / Miller, P. S.; Reis, B. L.; Calvert, C. C.; DePeters, E. J.; Baldwin, R. L.

In: Journal of Dairy Science, Vol. 74, No. 11, 01.01.1991, p. 3800-3806.

Research output: Contribution to journalArticle

Miller, P. S. ; Reis, B. L. ; Calvert, C. C. ; DePeters, E. J. ; Baldwin, R. L. / Relationship of Early Lactation and Bovine Somatotropin on Nutrient Uptake by Cow Mammary Glands. In: Journal of Dairy Science. 1991 ; Vol. 74, No. 11. pp. 3800-3806.
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