Evaluation of the National Research Council (NRC) nutrient requirements for beef cattle: Predicting feedlot performance

نویسندگان

  • E. K. Okine
  • D. H. McCartney
  • J. B. Basarab
چکیده

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 August 2003.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Amino Acid Nutrition of Feedlot Calves

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 کامل

Nutritional recommendations of feedlot consulting nutritionists: the 2007 Texas Tech University survey.

Forty-two consulting feedlot nutritionists were asked to participate in a survey regarding nutritional recommendations for feedlot cattle. Eleven nutritionists chose not to participate or did not reply to our request. Thirty-one nutritionists agreed to participate, and 29 completed the survey. Their practices were located in the following states: Texas, Kansas, and Oklahoma (46.43%); Iowa, Nebr...

متن کامل

Effects 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...

متن کامل

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 کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2004