Life 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
نویسنده
چکیده
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 preand postweaning feed consumption of progeny plus lifetime feed consumption of the dam. In the first approach, inputs and outputs were weighted by their probabi l i ty of occurrence; probabilit ies were a function of the age distr ibution of the cow herd and calf crop percentage in a theoretical herd. The second approach involved dividing the sum
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...
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