Selection indexes for beef cattle
نویسندگان
چکیده
منابع مشابه
Evaluation and Selection of Beef Cattle
In former times, selections in beef cattle were based on conformation alone. Today increased costs of production, competition from other feedstuffs and current exponential growth rates of human populations suggest that while energetic efficiency and volume of production are not the sole over-riding factors in beef cattle production, they are becoming increasingly important. The time has come wh...
متن کاملGenetic selection for temperament traits in dairy and beef cattle
Animal temperament can be defined as a response to environmental or social stimuli. There are a number of temperament traits in cattle that contribute to their welfare, including their response to handling or milking, response to challenge such as human approach or intervention at calving, and response to conspecifics. In a number of these areas, the genetic basis of the trait has been studied....
متن کاملSimulated selection for reproductive rate in beef cattle.
Computer simulation was used to evaluate four selection strategies for reproductive success in beef cattle. The strategies were no culling; culling of nonpregnant heifers; culling of nonpregnant heifers and cows nonpregnant twice; culling all nonpregnant females. In addition, simulations were conducted utilizing method four for 20 yr, then changed to method three for an additional 20 yr. Cows w...
متن کاملUsing Live Animal Carcass Ultrasound Information in Beef Cattle Selection
In some instances, value-based marketing systems can be economically advantageous to cattle producers. Monetary rewards are sometimes available for producing a high-quality, consistent end product that meets consumer demands. One tool that can help producers in the efficient and profitable production of beef cattle is live animal carcass ultrasound. This gives cattle producers the ability to ma...
متن کاملEvaluation of Selection Practices in Three Lines of Beef Cattle
Selection practices in three synthetic lines of beef cattle were evaluated based on data collected over 12 to 13 years. Sires from the Jersey, Angus and Simmental breeds were mated to three lines of foundation crossbred dams to produce first generation progeny. Subsequent calves were produced mating crossbred parents of the same generation. Crossbred sires were selected based on an index that i...
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ژورنال
عنوان ژورنال: Genetics Selection Evolution
سال: 1978
ISSN: 1297-9686
DOI: 10.1186/1297-9686-10-4-598b