Twinning and Efficiency of Beef Production
نویسندگان
چکیده
منابع مشابه
Genetic aspects of twinning in cattle.
Twinning in cattle ranges from about 1% for beef breeds to about 4% for dairy breeds. The incidence of double births may have both positive and negative effects, which mainly depends on the purpose for which the cattle are raised. Because of freemartinism, as well as management problems connected e.g. with a greater risk of dystocia and retained placenta, it is an undesirable trait in dairy her...
متن کاملEffects of sex control and twinning on economic optimization of culling cows in Japanese Black cow-calf production systems.
The effects of sex control and twinning techniques on determination of optimal culling parity of cows in beef cow-calf production systems were deterministically analyzed using a herd model simulation. The model simulated the annualized net revenue as an economic indicator during the whole life cycle of a cow. Biological factors (survivability, growth, reproduction, and feed requirements) and ec...
متن کاملTwinning in Beef Cattle: an Opportunity to Improve Reproductive and Economic Efficiency of Beef Production?
The possibility of improving the rate of reproduction in beef cattle by selection for an increased rate of twinning has been debated with both pessimism and optimism since the early days of animal breeding. The success of selection for multiple births in sheep lifted hopes that a similar program for cattle would also be successful. Pearl (1912) wrote, “From the standpoint of practical breeder i...
متن کاملCow-calf reproductive, genetic, and nutritional management to improve the sustainability of whole beef production systems.
Optimizing efficiency in the cow-calf sector is an important step toward improving beef sustainability. The objective of the study was to use a model to identify the relative roles of reproductive, genetic, and nutritional management in minimizing beef production systems' environmental impact in an economically viable, socially acceptable manner. An economic and environmental diet optimizer was...
متن کاملTwinning in cattle.
INTRODUCTION The biological efficiency of traditional systems of beef production is low due to the low reproductive rate and the high proportion of total energy which is required for maintenance of the breeding herd. Dickerson (1978) estimated that 56% of the total feed energy intake for adult and market cattle is required solely for body maintenance (the non-productive energy requirement rises...
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