Diurnal variation in milk and plasma urea nitrogen in Holstein and Jersey cows in response to degradable dietary protein and added fat

Journal of Dairy Science
L A RodriguezM L McGilliard

Abstract

Four Holstein and four Jersey cows fitted with ruminal and duodenal cannulas were used in two 4 x 4 Latin squares to investigate the effects of varying protein degradability and supplemental fat on diurnal changes in plasma and milk urea N. Dietary dry matter contained 16.2% crude protein with two concentrations of ruminally undegradable protein (RUP) that were obtained by substituting blood meal for a portion of soybean meal. Treatments were 1) 29% RUP and 0% added fat, 2) 29% RUP and 2.7% added fat (Ca soaps of fatty acids), 3) 41% RUP and 0% added fat, and 4) 41% RUP and 2.7% added fat. Dry matter of the total mixed diet fed at 1000 and 1400 h consisted of 30% corn silage, 29% alfalfa haylage, and 41% concentrate. Ruminal ammonia, plasma urea N, and milk urea N were measured every 4 h over a 24-h period. Dry matter intake was depressed 6.7% by added fat. Ruminal ammonia was 25 to 45% lower when the 41% RUP diets were fed. Overall, the concentration of plasma urea N and milk components were not influenced by diet. However, milk urea N was higher in Holsteins than in Jerseys. Both plasma and milk urea N increased within 2 h after the 1000-h feeding followed by a decline at 6 h after the 1400-h feeding. In this short-term study...Continue Reading

References

Aug 1, 1992·Journal of Dairy Science·E J DePeters, J P Cant
Sep 1, 1992·Journal of Dairy Science·W M SeymourJ H Herbein
Nov 1, 1992·Journal of Dairy Science·E J DePeters, J D Ferguson
Feb 1, 1993·Journal of Dairy Science·A H Gustafsson, D L Palmquist

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Citations

Oct 4, 2012·Animal : an International Journal of Animal Bioscience·E Humann-Ziehank, M Ganter
Jun 5, 2003·Journal of Dairy Science·P J Rajala-Schultz, W J A Saville
Sep 10, 2003·Journal of the American Veterinary Medical Association·Pedro MelendezWilliam W Thatcher

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