有哪些信誉好的足球投注网站the effect of body size on production efficiency in cattle. breed comparisons and inter-breed relationships牛的体型对生产效率的影响。.pdfVIP
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the effect of body size on production efficiency in cattle. breed comparisons and inter-breed relationships牛的体型对生产效率的影响。
THE EFFECT OF BODY SIZE ON PRODUCTION EFFICIENCY IN CATTLE BREED COMPARISONS AND INTER-BREED RELATIONSHIPS St.C.S. TAYLOR A.R.C. Animal Breeding Research Organisation, West Mains Road, Edinburgh EHg 3JQ,Scotland SUMMARY The effect of body size on the production efficiency of different breeds of cattle is considered only after examining the more general problem of breed comparisons in relation to genetics, nutrition and production physiology. Genetic problems include what breeds and crosses to compare, how to set up a structured multi-breed population, and what breeding programme to follow with a view to practising . across-breed selection. The main nutritional problem is what feeding system to adopt without prejudicing the outcome of a breed comparison, and mention is made of the advantages and disadvantages of ad libitum feeding with a complete standard diet. The main problem of pro- duction physiology is defining optimal performance. Indirect assessment of optimal performance, if it is to be effective, should be based on inter-breed relationships among characteristics of economic importance. Several inter-breed relationships are discussed, and those involving mean mature body size are considered with reference to making breed comparisons for productive efficiency. Some examples are given of specific breed comparisons with the effect of body size included and excluded. Breed comparisons in cattle are discussed under three headings: I) genetic problems, 2) nutritional problems, and 3) those associated with the assessment of productive merit. GENETIC OR BREEDING PROBLEMS Whether we are improving cattle by between-breed selection or by what is now popularly called breed substitution , o
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