Effects of graded amounts of duodenal infusions of methionine on the mammary uptake of major milk precursors in dairy cows

Journal of Dairy Science
J Guinard, H Rulquin

Abstract

Arteriovenous differences in plasma and rate of blood flow were measured across the udder of four lactating dairy cows to examine the effects of increased supplies of a limiting AA on nutrient balance to the mammary gland. Treatment consisted of graded amounts of duodenal infusions of DL-Met (0, 8, 16, and 32 g/d) over 4-d periods according to a 4 x 4 Latin square design. Cows were fed a diet formulated to meet protein and energy requirements and based on 70:30 corn silage:concentrate ratio and dehydrated alfalfa (1.5 kg/d of DM). The basal diet met 70% of Met requirements. Yields of milk, fat, and protein and milk fat content were unaffected by infusions of Met, but milk protein content tended to increase by 5% to a maximum at the third treatment. Surprisingly, the rate of mammary blood flow declined in response to infusions of Met. The mammary uptake remained constant, nevertheless, for oxygen, energy-yielding nutrients, and nonessential AA. In contrast, the quantity of essential AA taken up by the udder decreased. As a result, milk protein yield seemed sustained by an increased efficiency of the mammary gland. In addition, in response to the Met infusions, the arterial supply of Met nearly increased 3-fold, and the mammary u...Continue Reading

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Citations

Jul 1, 1997·The Proceedings of the Nutrition Society·B J Bequette, F R Backwell
Aug 5, 2004·Journal of Dairy Science·L DoepelH Lapierre
Jul 31, 2002·Journal of Dairy Science·P H LuimesD Petitclerc
Dec 5, 2000·Journal of Dairy Science·M KorhonenP Huhtanen
Apr 19, 2008·Journal of Dairy Science·M T SochaG A Ducharme
Jan 5, 2002·Journal of Dairy Science·S Pruekvimolphan, R R Grummer
May 23, 2000·Journal of Dairy Science·S J MabjeeshB J Bequette
May 23, 2002·Journal of Dairy Science·S J MabjeeshB J Bequette
Dec 16, 2019·Journal of Dairy Science·Alex BachMaria Vidal
Mar 1, 1997·The Proceedings of the Nutrition Society·D B ShennanD T Calvert
Feb 28, 2002·Journal of Dairy Science·A Delgado-ElorduyH Tagari
Apr 2, 2018·Journal of Dairy Science·John P CantJohn Doelman
Nov 11, 2019·Journal of Dairy Science·A J FlemingM D Hanigan

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