Breeding Programs of Dairymen Selecting Holstein Sires by Computer
نویسندگان
چکیده
منابع مشابه
Application of myostatin in sheep breeding programs: A review
Myostatin or growth and differentiation factor 8 (GDF8), has been known as the factor causing double muscling phenotypes in which a series of mutations make the myostatin protein inactive, hence disabling it to regulate the deposition of muscle fibre. This phenotype happens with high frequency in a breed of sheep known as the Texel. Quantitative trait loci (QTL) studies show that a portion of t...
متن کاملEvaluation of crosses of Holstein, Jersey or Brown Swiss sires x Holstein-Friesian/Gir dams. 2. Female liveweights.
The liveweights of 100 females sired by Holstein (H), Jersey (J) or Brown Swiss (BS) bulls out of Holstein-Friesian x Gir dams of 1/2 to 3/4 Holstein-Friesian fraction were compared. The animals were kept in a single herd under the same management. The data were analyzed separately for four age categories by least squares techniques. The models for cows and heifers older than 18 months included...
متن کاملSelecting and Breeding the Unique Brahman
The American Brahman, unique in many ways, differs from cattle of European origin in form, physiology and genetic make-up. The Brahman is generally utilized to complement rather than compete with others breeds. Even though the same basic genetic principles operate for Brahmans as for any other breed, goals are different and the gene pool and distribution of the Brahman population is different. ...
متن کاملRelationship of Somatic Cell Score and Linear Type Trait Evaluations of Holstein Sires
Genetic evaluations of Holstein bulls for mean somatic cell score were compared with their standardized transmitting abilities for linear type traits. Based on first lactation daughter information from five dairy records processing centers, PTA for somatic cell scores for 712 sires ranged from -.50 to .56. Standardized transmitting abilities for 14 type traits were provided for these bulls by t...
متن کاملOptimizing design of breeding programs
Beef cattle breeders are increasingly being offered gene marker tests for important traits in the breeding objective. They must make an economically rational decision whether to use these tests. Besides a potential immediate effect in seedstock sales, gene marker tests will affect the genetic improvement rate in the population. To examine the returns in a multi-trait breeding objective a pseudo...
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ژورنال
عنوان ژورنال: Journal of Dairy Science
سال: 1983
ISSN: 0022-0302
DOI: 10.3168/jds.s0022-0302(83)81840-2