Read e-book online Horse genetics PDF

By Bailey, E., Brooks, S. A. (Eds.)

ISBN-10: 1780643292

ISBN-13: 9781780643298

ISBN-10: 1845936752

ISBN-13: 9781845936754

The second one version of this publication includes chapters on horse breeding and genetics, together with the evolution and domestication of horses; genomics; the genetics of coat color and development, ailments and function; karyotypes and chromosome abnormalities; breeding programmes; epigenetics; genetic edition inside of and among breeds; the taxonomy of Equidae; questions and solutions in regards to the genetics and heredity of actual characteristics and illnesses and the appliance of selective breeding to enhance the health and wellbeing and function of horses. to be had In Print

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Sample text

One genotypic class is lethal, so the expected ratios need to be adjusted accordingly. ●● Several of these mechanisms simultaneously influence the trait expression. It is obviously much easier and faster for an individual dog breeder to obtain statistically significant data working with litters of puppies than for a horse breeder working with a single birth per mare each year! Indeed, with rare exceptions, such as the study of dominant white by Pulos and Hutt (1969), horse breeders are unlikely to use such information.

An X-linked recessive trait is generally obvious from an apparent association with males, but is not a trait that is necessarily associated with sexual characteristics. ●● A polygenic trait will: (i) be most frequent among related horses; (ii) shows exceptions to the dominant/recessive modes of inheritance; and (iii) is not usually confined to a single breed. Polygenic traits often show a continuous range of variation, ranging from normal to slightly affected to extremely affected. Examples of such traits in humans include diabetes and heart disease; for horses, conformation traits and performance traits behave as polygenic traits.

This word description of the color phenotype can suggest which alleles a particular animals might possess for pigment synthesis and distribution. However, there are several key limitations of word descriptions: ●● Most breeds have a rather restricted set of recognized color names compared with the variation of hues that exists. Although frustrating at times, this may be an appropriate policy because much of the variation in shade and intensity within colors is not yet defined by adequate genetic models.

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Horse genetics by Bailey, E., Brooks, S. A. (Eds.)


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