Download or read book Genetic and Phenotypic Relationships Among Yields of Milk and Its Components in Dairy Cattle written by Arden Ray Hardie and published by . This book was released on 1972 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Genetics of Cattle 2nd Edition written by Dorian Garrick and published by CABI. This book was released on 2014-11-28 with total page 642 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Dairy Chemistry and Biochemistry written by P. F. Fox and published by Springer. This book was released on 2015-06-19 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the most comprehensive introductory text on the chemistry and biochemistry of milk. It provides a comprehensive description of the principal constituents of milk (water, lipids, proteins, lactose, salts, vitamins, indigenous enzymes) and of the chemical aspects of cheese and fermented milks and of various dairy processing operations. It also covers heat-induced changes in milk, the use of exogenous enzymes in dairy processing, principal physical properties of milk, bioactive compounds in milk and comparison of milk of different species. This book is designed to meet the needs of senior students and dairy scientists in general.
Download or read book A Study of the Genetic Relationships of Solids not fat Production in Bovine Milk written by Marvin Lyle Nelson and published by . This book was released on 1965 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetic and Phenotypic Relationships Between Certain Body Measurements and Milk Production in Dairy Cattle written by John Clark Wilk and published by . This book was released on 1962 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Herd Environment on the Genetic and Phenotypic Relationship Among Milk Yield Fertility and Somatic Cell Score in Holstein Cattle written by Héctor Juárez Castillo and published by . This book was released on 1998 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetic Relationships for Milk and Fat Yields Between Brazilian and United States Holstein Cattle Populations written by Claudio Napolis Costa and published by . This book was released on 1998 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Advances in Breeding of Dairy Cattle written by Julius Van der Werf and published by . This book was released on 2019 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fertility in the High Producing Dairy Cow written by M. G. Diskin and published by . This book was released on 2001 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Environment on Nutrient Requirements of Domestic Animals written by National Research Council and published by National Academies Press. This book was released on 1981-02-01 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetic and Phenotypic Relationships Among Fifteen Measures of Reproduction in Dairy Cattle written by Ole Mervin Meland and published by . This book was released on 1984 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetic Relationships Between Milk Fat SNF and Protein written by William Wayne Wunder and published by . This book was released on 1964 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Herd Environment on the Genetic and Phenotypic Relationships Among Milk Yield Fertility and Somatic Cell Score in Holstein Cattle written by Hector Juarez Castillo and published by . This book was released on 1998 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: A total of 248,230 first parity records of Holstein cows calving from 1987 to 1994, daughters of 588 sires in 3,042 herds were used to evaluate genotype by environment interactions in mature equivalent milk yield (MEM), lactation mean somatic cell score (LMSCS), and conception rate at first service (CRFS). Herds were classified into low and high management groups using three different criteria to differentiate production environments. Phenotypic means for MEM and body weight at first calving were greater in high than in low management herds, while low management herds had higher phenotypic means for LMSCS, CRFS, and age at first calving than high management herds. Genetic parameters were modeled using multiple trait linear models. For the complete data set heritability estimates for MEM, LMSCS, and CRFS, were 0.276, 0.103, and 0.015. Heritabilities and genetic and phenotypic correlations were consistent regardless of the environmental classification criteria. For low management herds, heritabilities for MEM, LMSCS, and CRFS averaged 0.232, 0.101, and 0.020, while for high management herds average heritabilities were 0.283, 0.097, and 0.009. For the low management herds, genetic (and phenotypic) correlations between MEM and LMSCS, MEM and CRFS, LMSCS and CRFS averaged 0.247, $-$0.407, and $-$0.228, ($-$0.055, $-$0.174, and $-$0.037), while for the high management herds they averaged 0.178, $-$0.304, and $-$0.139, ($-$0.089, $-$0.171, and $-$0.034). The genetic correlations between pairs of traits were consistently lower in high than in low management groups, suggesting a genotype by environment interaction. These changes suggest that differences of management between the two management levels reduces considerably the antagonistic genetic association between the traits studied. Breeding programs designed to increase milk yield at the same time that to reduce the genetic increase of LMSCS and the rate of genetic deterioration of CRFS must take into account the magnitude of the differences in the expected correlated responses in LMSCS and CRFS in the two levels of management.
Download or read book Nutrition and Lactation in the Dairy Cow written by Philip C. Garnsworthy and published by Elsevier. This book was released on 2013-10-22 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nutrition and Lactation in the Dairy Cow is the proceedings of the 46th University of Nottingham Easter School in Agricultural Science. Said symposium was concerned with the significant advances in the field of nutrition and lactation in the dairy cow. The book is divided in five parts. Part I deals with the principles behind nutrition and lactation of cows. Part II discusses the cow’s nutrient interactions; responses to nutrients that yield protein and energy; and the influence of nutrient balance and milk yields. Part III tackles the efficiency of energy utilization in cows and its relation to milk production. Part IV talks about food intake of cows and the factors that affect it, while Part V deals with the different feeding systems for cows. The text is recommended for those involved in raising cows and dairy production, especially those who would like to know more and make studies about the relationship of nutrition and lactation of cows.
Download or read book The Genetic Effect on Reproduction in the Israeli Dairy Cattle Population and the Genetic and Phenotypic Relationships Between Reproduction and Milk Production Traits written by Kjeld Kragelund and published by . This book was released on 1976 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ruminant Nutrition written by Robert Jarrige and published by John Libbey Eurotext. This book was released on 1989 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: Deals with feed evaluation systems, the nutrient requirements of ruminant livestock and the feeding value of a wide range of feedstuffs. This book lists about 800 typical forages, 65 crop residues and 120 concentrate and by-product feeds. It is suitable for teachers, specialist scientists and industrialists.
Download or read book Likelihood Bayesian and MCMC Methods in Quantitative Genetics written by Daniel Sorensen and published by Springer Science & Business Media. This book was released on 2007-03-22 with total page 745 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book, suitable for numerate biologists and for applied statisticians, provides the foundations of likelihood, Bayesian and MCMC methods in the context of genetic analysis of quantitative traits. Although a number of excellent texts in these areas have become available in recent years, the basic ideas and tools are typically described in a technically demanding style and contain much more detail than necessary. Here, an effort has been made to relate biological to statistical parameters throughout, and the book includes extensive examples that illustrate the developing argument.
