Nationwide Research in Cattle Reproduction. A Review
نویسندگان
چکیده
منابع مشابه
A review of population data utilization in beef cattle research.
Controlled experimentation has been the most common source of research data in most biological sciences. However, many research questions lend themselves to the use of population data, or combinations of population data and data resulting from controlled experimentation. Studies of important economic outcomes, such as efficiency, profits, and costs, lend themselves particularly well to this typ...
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Different livestock sectors as beef industries get benefit from the production of male animals while dairy industries get benefit from the milk production by the female animals. Therefore, it is obvious need to produce the animals of desired sex which can be achieved by predetermining the sex of conceptus at the time of conception i.e. pre determination of sex may be of great economic importanc...
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The paper is presented in three parts. It is not a review of the literature but a statement of the authors’ views in the light of their experience, and backed by their recent experimental results. Introduction. The physiological principles of control of the ovarian cycle are discussed, together with the practical problems associated with such control. The complexities of the problems directly a...
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Reproduction is a key profit driver in beef cattle production systems around the world. However genetic evaluation for reproduction traits is generally limited or non-existent. This is likely a function of low levels of recording reproduction traits, and low heritabilities. Traditional BLUP based genetic evaluations have been used effectively in beef for generating estimated breeding values and...
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Disposition has been shown to significantly affect feed intake and growth rates of beef cattle. However, little research has evaluated the effects of poor disposition, and methods to improve this trait, on reproductive function of beef females. Thus, two experiments were conducted to determine the effects of disposition and acclimation to human handling on reproductive function of mature cows a...
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ژورنال
عنوان ژورنال: Journal of Dairy Science
سال: 1958
ISSN: 0022-0302
DOI: 10.3168/jds.s0022-0302(58)91012-9