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Title: Nitrogen Transactions in Ruminants
Contributor(s): Nolan, JV (author)orcid ; Dobos, RC (author)
Publication Date: 2005
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Abstract: The primary goal of ruminant nutritionists is to achieve maximum output of proteinaceous materials in products such as milk, meat and wool with a minimum of dietary crude protein (CP) inputs. In practice, this nitrogen (N) output to input ratio is relatively low. For example, it can vary from 13% for milk protein production in pasture-fed dairy cows (Wanjaiya et al., 1993) to 31% in dairy cows grazing on Lolium perenne based pasture (Delagarde et al., 1997). However, since 40-45% efficiency coefficients are theoretically possible in dairy cows (Van Vuuren and Meijs, 1987; Hvelplund and Madsen, 1995), there is scope for considerable improvement in nutritional management of our grazing livestock. Moreover, increasing the efficiency of use of protein N by livestock, leading to lower N excretion, is becoming an environmental imperative in many countries (Castillo et al., 2001).
Publication Type: Book Chapter
Source of Publication: Quantitative Aspects of Ruminant Digestion and Metabolism, p. 177-206
Publisher: CABI Publishing
Place of Publication: Wallingford
ISBN: 0851998143
Field of Research (FOR): 070204 Animal Nutrition
HERDC Category Description: B1 Chapter in a Scholarly Book
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