Effect of rumen-protected methionine and lysine on casein in milk when diets high in fat or concentrate are fed

Journal of Dairy Science
J M ChowR L Baldwin

Abstract

To examine the effect of supplying methionine and lysine on milk N composition, isoenergetic, isonitrogenous diets containing 50:50 with 3.9% added fat or 25:75 forage to concentrate with no added fat were fed with or without rumen-protected methionine and lysine to four primiparous and four multiparous early lactation (36 d in milk) Holstein cows in two 4 x 4 Latin squares. Diets contained 1.7 Mcal NE1 and were fed for ad libitum intake. Periods were 21 d. Rumen-protected methionine and lysine increased total N and casein N percentage with the 3.9% fat, but did not increase total N and casein N percentage with the diet without fat. Whey N percentage was greater with the no fat than with the 3.9% fat diet. Whey N percentage was not affected by adding amino acids. Nonprotein N percentage was greater for the diet with the 3.9% fat than with no fat. Proportions of casein N or whey N to total N were unaffected by treatments. Adding methionine and lysine to diets did not increase yields of total N and casein N. The 3.9% fat diet increased proportions of long-chain (C18:0 and C18:1) and decreased proportions of short- to medium-chain fatty acids (C8 to C16) in milk fat. Plasma nonesterified fatty acids and triglyceride concentrations...Continue Reading

References

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Citations

Dec 3, 2013·Animal : an International Journal of Animal Bioscience·K D SinclairL A Sinclair
Feb 1, 1993·Journal of Dairy Science·A H Gustafsson, D L Palmquist
Nov 1, 1992·Journal of Dairy Science·E J DePeters, J D Ferguson
Nov 1, 1994·Journal of Dairy Science·K KarunanandaaT Lykos
Apr 1, 1994·Journal of Dairy Science·R A ChristensenJ H Clark
Apr 19, 2008·Journal of Dairy Science·M T SochaG A Ducharme
Jul 1, 1992·Journal of Dairy Science·D J SchauffJ K Drackley
Aug 1, 1992·Journal of Dairy Science·E J DePeters, J P Cant
Jul 12, 2012·Journal of Aquatic Animal Health·Randall W Oplinger, Eric J Wagner
Jun 1, 1993·Journal of Dairy Science·D L PalmquistD M Barbano
Nov 11, 2019·Journal of Dairy Science·A J FlemingM D Hanigan
Mar 1, 1993·Metabolism: Clinical and Experimental·G A MeijerA M van Vuuren

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