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Nitrogen metabolism and milk production in dairy cows fed semi-restricted amounts of ryegrass-legume silage with birdsfoot trefoil (Lotus corniculatus L.) or white clover (Trifolium repens L.)

Eriksson, Torsten and Norell, L and Nilsdotter-Linde, Nilla (2012). Nitrogen metabolism and milk production in dairy cows fed semi-restricted amounts of ryegrass-legume silage with birdsfoot trefoil (Lotus corniculatus L.) or white clover (Trifolium repens L.). Grass and forage science. 67:4, 546-558
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Official URL: http://dx.doi.org/10.1111/j.1365-2494.2012.00882.x

Abstract

In change-over trials, mid-lactation dairy cows were fed concentrate-supplemented, isonitrogenous and isofibrous perennial ryegrasslegume silage diets that satisfied energy requirements but were suboptimal with respect to metabolizable protein supply. Legumes were either birdsfoot trefoil with low levels of condensed tannins (typical for hemiboreal conditions), or white clover. Averaged over two experimental years, birdsfoot trefoilbased silage resulted in lower digestibility (P < 0.001) of dry matter (50 g kg(-1)), organic matter (52 g kg(-1)), neutral detergent fibre (120 g kg(-1)) and nitrogen (24 g kg(-1)) and lower rumen total volatile fatty acid concentration (7 mm; P = 0.009). Milk protein yield was 36 g d(-1) higher with birdsfoot trefoil silage (P = 0.002), while raw milk yield tended to be 0.8 kg d(-1) higher (P = 0.06). Rumen ammonia concentration was similar between diets, but milk urea concentration (P < 0.001), urinary urea excretion (P = 0.002) and faecal-N proportion (P = 0.001) were higher with birdsfoot trefoil silage. The results suggest that grassbirdsfoot trefoil silage produced in hemiboreal areas exhibits a protein-sparing effect in dairy rations, despite a low condensed tannin content that is further diluted by companion grasses and ration concentrate proportion.

Authors/Creators:Eriksson, Torsten and Norell, L and Nilsdotter-Linde, Nilla
Title:Nitrogen metabolism and milk production in dairy cows fed semi-restricted amounts of ryegrass-legume silage with birdsfoot trefoil (Lotus corniculatus L.) or white clover (Trifolium repens L.)
Series/Journal:Grass and forage science (0142-5242)
Year of publishing :2012
Volume:67
Number:4
Page range:546-558
Number of Pages:13
Publisher:Wiley-Blackwell
ISSN:0142-5242
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Submitted version
Full Text Status:Public
Agris subject categories.:L Animal production > L50 Animal physiology and biochemistry
L Animal production > L51 Animal physiology - Nutrition
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
Keywords:birdsfoot trefoil, white clover, silage, dairy cows, condensed tannins, nitrogen balance
URN:NBN:urn:nbn:se:slu:epsilon-e-1695
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-1695
Additional ID:
Type of IDID
Web of Science (WoS)000310874500009
DOI10.1111/j.1365-2494.2012.00882.x
ID Code:10505
Department:(NL, NJ) > Dept. of Crop Production Ecology
(VH) > Dept. of Animal Nutrition and Management
Deposited By: SLUpub Connector
Deposited On:08 Nov 2013 10:55
Metadata Last Modified:10 Dec 2014 12:59

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