Cattle Genetic
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Taking Beef Cattle Breeding Into The 21st Century
Efficiency of beef production will be the major concern of beef breeders well into the twentyfirst century. The competition from other protein sources will provide the incentive for the beef industry to incorporate current breeding technology and the new emerging biotechnologies into commercial production systems. Considerable effort by the scientific community and expense to the industry will be encountered to make beef a competitive protein source. A number of technologies are developing to enhance beef production efficiency.
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Multibreed Genetic Evaluations Of Beef Cattle
Genetic evaluation for multibreed populations has received increased attention in the last decade. Here we discuss modeling considerations for analysis of multibreed field data, review strategies for analysis present in the literature, and discuss our experiences generating EPDs for crossbred animals in the U. S. and Canadian Simmental genetic evaluation program.
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Determination Of An Appropriate Selection Criteria For Growth Composition In Charolais
A total of 3994 carcass records representing 170 sires were used to determine an appropriate lean-related trait to be used in a genetic improvement program. Lean yield (LY) was predicted using carcass weight (CW), ribeye area (REA) and fat thickness (FAT) and used to calculate other composite traits: lean carcass weight (LW) and 3 variants of lean growth rate (LGRl, LGR2 and LGR.3).
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Genetic Improvement Of Beef Production Traits By Performance Testing Beef Bulls In France
Genetic correlations between central performance tests (CPT) and progeny tests were estimated in Limousine and Charolais breeds using bulls that were successively performance and progeny tested in France : 113 out of 587 Limousine bulls with a positive performance test and 60 (30 top ranking and 30 lower ranking) out of 5 10 Charolais bulls were used.
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