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|Title:||Nitrogen Transactions in Ruminants||Contributor(s):||Nolan, JV (author) ; Dobos, RC (author)||Publication Date:||2005||Handle Link:||https://hdl.handle.net/1959.11/388||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||Other Links:||http://www.cabi.org/datapage.asp?iDocID=228
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