New National Research Council (NRC) Beef Cattle Requirements - Range Application
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چکیده
منابع مشابه
Application of the 1996 NRC to Protein and Energy Nutrition of Range Cattle
Based on applications of the 1996 National Research Council (NRC) Nutrient Requirement of Beef Cattle (2000 update) model at our laboratories and on use of the model to evaluate published literature, it is our assessment that the NRC model (Level 1) represents an advancement in nutrient requirements of grazing cattle. We evaluated 8 published studies (35 treatment observations) to compare obser...
متن کاملEvaluation of the National Research Council (NRC) nutrient requirements for beef cattle: Predicting feedlot performance
1Department of Agriculture and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada T6G 2P5; 2Agriculture and Agri-Food Canada, Lacombe Research Centre, 6000 C&E Trail, Lacombe, Alberta, Canada T4L 1W1; 3Alberta Agriculture, Food and Rural Development, Western Forage Beef Group, Lacombe Research Centre, Lacombe, Alberta, Canada. T4L 1W1. Received 27 January 2003, accepted 28 Au...
متن کاملEffects of body weight, frame size and rate of gain on the composition of gain of beef steers.
Energy concentration of gain (EG) is an inherent component in beef cattle feeding systems. The National Research Council (NRC) uses equations based on body weight, rate of gain and cattle type to predict EG and, in turn, to calculate dietary energy requirements. From EG, fat and protein deposition can be calculated directly. A dynamic computer growth model also can be used to estimate EG. In bo...
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In 1996 the Subcommittee on Beef Cattle Nutrition of the National Research Council (NRC) released the seventh revised edition of the 'Nutrient Requirements of Beef Cattle' (subsequently updated as NRC, 2000). Among the more dramatic changes with this revision was the enhanced characterization of feedstuffs with respect to composition and degradation rates of N and carbohydrate fractions, with t...
متن کاملPredicting net energy and protein requirements for growth of implanted and nonimplanted heifers and steers and nonimplanted bulls varying in body size.
Energy and protein retained in 50, 38, and 54 nonimplanted Holstein and Angus heifers, steers, and bulls, respectively, 17 pens (237 cattle) of beef breed implanted heifers, and 65 pens (535 cattle) of beef breed implanted steers were compared to values predicted by the 1984 National Research Council (NRC), Cornell Net Carbohydrate and Protein System (CNCPS), and the model of Oltjen et al. (OLT...
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