Patterns of nutrient uptake by the mammary glands of lactating dairy cows.

Journal of Dairy Science
P S MillerR L Baldwin

Abstract

Twenty-one multiparous lactating dairy cows with previous 305-d milk production records varying from 5900 to 13,600 kg were used to examine patterns of nutrient uptake by the mammary glands. On d 71 and continuing until d 126 of lactation, animals were injected daily with 40 mg of sometribove (bST group) or bicarbonate buffer (control group). Arterial and venous blood plasma samples were collected over a 12-h period on d 35, 70, 105, and 126 of lactation. Regression equations developed to evaluate linear effects of plasma arterial concentrations on net arterial-venous difference across the mammary glands demonstrated that, for acetate, NEFA, and D-beta-hydroxybutyrate, plasma arterial concentration accounted for over 50% of variation in uptake by the mammary glands. Additionally, a sigmoidal equation fitted the relationship between D-beta-hydroxybutyrate plasma arterial concentration and mammary gland uptake (r2 = .70). Triacylglyceride concentration was less effective in predicting uptake (r2 = .25). Administration of bST did not alter patterns of nutrient uptake, but a fourfold increase in NEFA uptake was predicted for bST-treated cows from this study, using NEFA concentrations from the literature. These observations indicate...Continue Reading

References

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Citations

Nov 14, 2013·Journal of Mammary Gland Biology and Neoplasia·Feng-Qi Zhao
Oct 29, 2011·Journal of Dairy Science·J Guinard-FlamentC Hurtaud
Mar 20, 1998·The British Journal of Nutrition·M D HaniganN E Smith
Feb 11, 2014·Journal of Mammary Gland Biology and Neoplasia·Edgar C Ontsouka, Christiane Albrecht
Feb 1, 2018·Journal of Animal Science·Gary J HausmanSteve B Smith
Nov 16, 2019·Annual Review of Animal Biosciences·Mark D Hanigan, Veridiana L Daley
Oct 8, 2016·BMC Bioinformatics·Junli DuYulin Chen
Aug 6, 2020·International Journal of Molecular Sciences·Marie-Cécile Alexandre-GouabauVincent Paillé

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