Genetic Relationships Between Milk Production and Growth in Holsteins ... PDF Download
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Author: David W. Blackmore
Publisher:
ISBN:
Category : Cattle
Languages : en
Pages : 160
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Book Description
Author: David W. Blackmore
Publisher:
ISBN:
Category : Cattle
Languages : en
Pages : 160
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Book Description
Author: James Amon Grantham
Publisher:
ISBN:
Category :
Languages : en
Pages : 66
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Book Description
Author: Joseph Calbert Johnson
Publisher:
ISBN:
Category : Holstein-Friesian cattle
Languages : en
Pages : 118
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Book Description
Author: Walker Myrick Dawson
Publisher: Forgotten Books
ISBN: 9780365770527
Category : Business & Economics
Languages : en
Pages : 28
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Book Description
Excerpt from Genetic Correlations Between Milk Production and Meat Production Traits in Milking Shorthorn Cattle A knowledge of the genetic relationships between lactation and growth and carcass traits in cattle is basic to an understanding of the degree to which excellence in desired characters can be combined in the same animal. The magnitude of positive or negative associations among traits is a major factor in determining whether the beef and dairy industries should use specialized types or dual-purpose types. A question of equal importance relates to the indirect effects, if any. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author: Marvin Lyle Nelson
Publisher:
ISBN:
Category :
Languages : en
Pages : 154
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Book Description
Author: Barbara L. Irion
Publisher:
ISBN:
Category : Calves
Languages : en
Pages : 140
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Book Description
Author: Claudio Napolis Costa
Publisher:
ISBN:
Category :
Languages : en
Pages : 394
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Book Description
Genetic relationships between Brazilian and U.S.A. Holstein cattle populations were studies using firstlactation 305-d ME milk and fat records of 29,413 daughters of 705 sires in Brazil and 726,932 daughters of 701 sires in the U.S.A. There were 358 sires with daughter records in both countries. Data sets consisted of all herds and low and high herds stratified by within-year standar deviation for milk (HYSD) computed within counthin country. Components of (co) variance, heritability, and genetic correlations for milk and fat yields were estimated using three data groupings: all, low and high HYDS data sets form within-country and between-country bivariete and multivariate analyses, simutaneous milk and fat yields in both countries. A sire model was solved with a restricted Maximum Likelihood (REML) derivative-free algorithm. Heritabilies for milk and fat yields using all the data were smaller in Brazil (.26 and .23) than in the in the U.S.A. (.33 and .36). Genetic correlations between milk and fat were .79 in Brazil and .62 in the U.S.A. Sire and residual variances for milk yield in Brazil were 59% and 81% (all herds), 51% and 58% (low HYSD herds), and 59% and 101% (high HYSD herds) as large as those obtained for all the U.S.A. data. corresponding percentage values for fat yield were 39% and 65%, and 48%, and 41 and 80%, respectively. Genetic correlations obtained from biavariate analyses between countries ranged from .79 to .87 for milk yield and were .89 or .90 for fat yield. Parameter estimates using all data for bibariate and multivariate analyses were essentially the same. Correlated response from sire selection using the U.S.A. information increased with average HYSD Brazil: daughter response was greatest (.77 kg/kg for milk yield and .63 kg/kg for fat yield) based on information from U.S.A. half-sisters in low HYSD herds. Unequal daughter responses from unequal genetic (co) variances under restrictive Brazilian conditions support the presence of an interaction between genetype and environment, which affects the yield expectation of daughters of U.S.A. sires performing in Brazilian herd enrironments.
Author: Robert H. Miller
Publisher:
ISBN:
Category : Cattle
Languages : en
Pages : 162
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Book Description
Author: Julius Van der Werf
Publisher:
ISBN: 9781786762986
Category : Cattle
Languages : en
Pages : 659
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Book Description
Author: Dorian Garrick
Publisher: CABI
ISBN: 1780642210
Category : Science
Languages : en
Pages : 642
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Book Description
Since the time of domestication more than 10,000 years ago, cattle have played an increasingly crucial role in the development of human civilizations. Progress has been quite remarkable since the turn of the century; the sequencing of the bovine genome in 2009 launched new avenues for furthering our understanding of theoretical and practical aspects of cattle genetics. Covering a vast array of questions, this book reviews major topics from molecular and developmental genetics, disease resistance and immunogenetics to genetic improvement of dairy and beef breeds, addressing all current problems in the field. This second edition includes a new team of authors and completely new chapters on the genetics of fat production, nutrition, feed intake and efficiency, growth and body composition. Fully updated throughout, it provides a valuable resource on cattle genetics for researchers, breeders, veterinarians and postgraduate students.
