Efficiency of nitrogen use in dairy cows grazing ryegrass with different water soluble carbohydrate concentrations

L. A. Miller, D. H. Baker, Michael K. Theodorou, John C. MacRae, Mervyn O. Humphreys, Nigel D. Scollan, Jon M. Moorby

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Abstract

This experiment is one of a series designed to investigate the efficiency of nitrogen (N) use in Holstein-Friesian dairy cows grazing perennial ryegrass (Lolium perenne) which has been bred to express high water soluble carbohydrate (WSC) concentrations. Animals grazed either a High Sugar (HS) grass or a Control (C) variety chosen on the basis of heading date compatibility. Dry matter (DM) intakes were estimated using herbage mass. Milk yields, milk constituent concentrations and plasma concentrations of b-hydroxybutyrate, glucose, total protein, albumin and urea were also measured. Forage DM intakes were similar for the two grasses. However, because of differences in the nitrogen content of the varieties (128 vs 176 g crude protein (CP) kg-1 DM; s.e.d. 10.5; P
Original languageEnglish
Pages10-21
Number of pages12
Publication statusPublished - 2001
Externally publishedYes

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