Life cycle efficiency of beef production: VIII. Relationship between residual feed intake of heifers and subsequent cow efficiency ratios1,2
نویسندگان
چکیده
منابع مشابه
Life cycle efficiency of beef production: II. Relationship of cow efficiency ratios to traits of the dam and progeny weaned.
Several measures of life cycle cow efficiency were calculated using weights and individual feed consumptions recorded on 160 dams of beef, dairy and beef X dairy breeding and their progeny. Ratios of output to input were used to estimate efficiency, where outputs included weaning weights of progeny plus salvage value of the dam and inputs included creep feed consumed by progeny plus feed consum...
متن کاملEvaluation of life-cycle herd efficiency in cow-calf systems of beef production.
A deterministic beef efficiency model (BEM) was used to evaluate life-cycle herd efficiency (LCHE) in cow-calf beef production systems using four breed groups of beef cattle. The breed groups were Beef Synthetic #1 (SY1), Beef Synthetic #2 (SY2), Dairy Synthetic (DS), and purebred Hereford (HE). The LCHE was defined over the lifetime of the herd as the ratio of total output (lean meat equivalen...
متن کاملLife Cycle Efficiency of Beef Production: Vi. Relationship of Cow Efficiency Ratios for Progeny Slaughtered to Growth, Condition, Fertility and Milk Production of the Dam 1'2'3
Weights and individual feed consumptions of 160 beef, dairy and beef • dairy darns and their progeny were used to estimate several measures of life cycle cow efficiency. Efficiency was expressed as the ratio of ou tput to input, where output included relative values for slaughter weights, carcass weights and t r immed wholesale cut weights of progeny and weight of the dam, and inputs were prean...
متن کاملResidual Feed Intake and Feed Efficiency: Differences and Implications
In the beef production system, 70-75% of the total dietary energy is used for maintenance (Ferrell and Jenkins 1984; NRC 1996; Montaldo-Bermudez et al. 1990). Thus, while only 5% of the total life cycle dietary energy consumption is used for protein deposition in beef cattle, swine and poultry are more efficient at 14 and 22%, respectively. The relatively large size, slow maturity and slow repr...
متن کاملVariation in Feed Efficiency of Growing Heifers and Implications for Intensified Cow-Calf Production
Global demand for food has been projected to increase 70% by 2050 in order to support a growing population that is becoming more urbanized and affluent. As disposable incomes increase in developing countries, people will elect to include more animal-protein foods in their diet. This rising demand for animal protein will require a concomitant increase in the supply of cereal grains as well as pr...
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ژورنال
عنوان ژورنال: Journal of Animal Science
سال: 2016
ISSN: 0021-8812,1525-3163
DOI: 10.2527/jas.2016-0690