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Direct Maternal Genetic Correlations For Preweaning Growth In Hereford Cattle
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Book Synopsis Direct-maternal Genetic Correlations for Preweaning Growth in Hereford Cattle by : Assefaw Tewolde
Download or read book Direct-maternal Genetic Correlations for Preweaning Growth in Hereford Cattle written by Assefaw Tewolde and published by . This book was released on 1981 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt: Maternal effects are an important source of variation in pre-weaning traits in beef cattle.
Book Synopsis Estimation of Direct and Maternal Additive and Heterotic Effects for Preweaning Growth Traits in Cattle Breeds Represented in the Southern Region by : Wayne Edward Wyatt
Download or read book Estimation of Direct and Maternal Additive and Heterotic Effects for Preweaning Growth Traits in Cattle Breeds Represented in the Southern Region written by Wayne Edward Wyatt and published by . This book was released on 1986 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effects of Within Breed Selection for Yearling Weight and Crossbreeding on the Cow-calf Unit by : Bruce E. Cunningham
Download or read book The Effects of Within Breed Selection for Yearling Weight and Crossbreeding on the Cow-calf Unit written by Bruce E. Cunningham and published by . This book was released on 1985 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Direct and Maternal Effects on Preweaning Characters of Brahman, Hereford and Brahman-Hereford Crossbred Cattle by : Rodney Lee Roberson
Download or read book Direct and Maternal Effects on Preweaning Characters of Brahman, Hereford and Brahman-Hereford Crossbred Cattle written by Rodney Lee Roberson and published by . This book was released on 1984 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Direct and Maternal Genetic Effects on Preweaning Characteristics of Brahman, Hereford and Brahman-Hereford Crossbred Cattle by :
Download or read book Direct and Maternal Genetic Effects on Preweaning Characteristics of Brahman, Hereford and Brahman-Hereford Crossbred Cattle written by and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of Response to Selection and Inbreeding in a Closed Line of Hereford Cattle by : J. S. Brinks
Download or read book Evaluation of Response to Selection and Inbreeding in a Closed Line of Hereford Cattle written by J. S. Brinks and published by . This book was released on 1965 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Estimation of Direct and Maternal Additive and Heterotic Genetic Effects for Preweaning Traits in Beef Cattle by : Chi Lawrence Tawah
Download or read book Estimation of Direct and Maternal Additive and Heterotic Genetic Effects for Preweaning Traits in Beef Cattle written by Chi Lawrence Tawah and published by . This book was released on 1987 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract.
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1997 with total page 806 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Direct and Maternal Effects on Beef Cattle by :
Download or read book Direct and Maternal Effects on Beef Cattle written by and published by . This book was released on 1991 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt: In cattle, pre-weaning (WG) and calving ease (CE) are referred to as maternal traits which have both a genetic and a behavioral basis. This study separates the direct and maternal effects of both WG and CE and estimates the heritability of each.
Book Synopsis Direct and Correlated Responses to Selection for Weaning Weight and Postweaning Gain in Hereford Cattle by : Renato Irgang
Download or read book Direct and Correlated Responses to Selection for Weaning Weight and Postweaning Gain in Hereford Cattle written by Renato Irgang and published by . This book was released on 1984 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: Single trait selection was practiced in three lines of Hereford cattle derived from a common base population. Bulls were selected within sire families for increased weaning weight (WW) in line WWL, increased postweaning gain (PG) in line PGL and ramdomly selected in the control line (CTL). The data consist of 2,467 progeny produced from 1967 to 1981 by 125 sires and 922 dams. After 3 years of stablishing the foundation population, 12 years of continuous selection resulted in slightly less than two generations of selection of selection and in low inbreeding coefficients. Direct selection applied to either WW or PG improved both traits. However, selection for PG increased both PG and WW faster than selection for WW. Selection for WW and for PG increased milk production, preweaning daily gain, yearling weight and feed intake. Correlated responses in these traits were larger in PGL than in WWL. Selection for either WW or PG also increased the amount of fatness in bulls in feedlot. However, it did not result in any significant change in feed efficiency. Increased birth weight was observed from PG selection but not from WW selection. Realized heritabilities and regression coefficients of correlated responses on cumulative selection differentials, estimated from "quasi-replicates" generated by grouping individual descendents from sires utilized in different years of the foundation population, indicated that genetic drift affected responses to selection and suggest that replication of selection experiments is necessary ...
Book Synopsis Direct and Maternal Effects on Beef Cattle by : J. W. Wilton
Download or read book Direct and Maternal Effects on Beef Cattle written by J. W. Wilton and published by . This book was released on 1991 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt: In cattle, pre-weaning (WG) and calving ease (CE) are referred to as maternal traits which have both a genetic and a behavioral basis. This study separates the direct and maternal effects of both WG and CE and estimates the heritability of each.
Book Synopsis Genetic Parameter Estimates and Breed Effects for Calving Difficulty and Birth Weight in a Multi-breed Population by : Cashley Marie Ahlberg
Download or read book Genetic Parameter Estimates and Breed Effects for Calving Difficulty and Birth Weight in a Multi-breed Population written by Cashley Marie Ahlberg and published by . This book was released on 2014 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: There are multiple breeds of beef cattle available to utilize in breeding systems to maximize production and economics. Calving difficulty (dystocia) is a significant cost to beef production and is more prevalent in first-calf heifers. The objectives of this study were to estimate genetic parameters and breed differences for calving difficulty and birth weight as a first step towards the development of across-breed adjustment factors for calving difficulty. Two models were employed to analyze birth weight (BWT) and calving difficulty (CD) recorded on 4,579 first parity females from the Germplasm Evaluation program at the U.S. Meat Animal Research Center (USMARC). Both bivariate animal models fit CD and BWT either using CD scores based on USMARC scoring system (Model 1) or CD assigned as Z scores based on the midpoint incidence rate (Model 2). Heritability estimates (SE) for BWT direct, CD direct, BWT maternal and CD maternal for model 1 were 0.35 (0.10), 0.29 (0.10), 0.15 (0.08), and 0.14 (0.08), respectively. Heritability estimates for BWT direct, CD direct, and BWT maternal for model 2 were similar to model 1. The estimate of CD maternal from model 2 was 0.13 (0.08). Genetic correlation estimates were positive between BWT direct and CD direct (0.63 ±0.17; model 1) and (0.64±0.17; model 2). All other genetic correlations were not significant. Bos Indicus influenced breeds tended to have the largest estimates of BWT direct. Calving difficulty direct breed effects ranged from -1.01 to 7.50 for model 1 and from -1.06 to 7.36 for model 2. Calving difficulty maternal breed effects ranged from -1.55 to 5.27 for model 1 and from -1.55 to 5.25 for model 2. Diverse biological types of cattle have different effects on both birth weight and calving difficulty. These differences can be used to match breeds to complement needs of production systems. Across-breed adjustment factors are needed for producers to accurately make selection decisions between sires of different breeds to improve calving difficulty.
Book Synopsis Estimates of Direct, Maternal and Grandmaternal Genetic Variances for Weights and Gains of Swine Weaned at Four Weeks of Age by : Daryl Lynn Kuhlers
Download or read book Estimates of Direct, Maternal and Grandmaternal Genetic Variances for Weights and Gains of Swine Weaned at Four Weeks of Age written by Daryl Lynn Kuhlers and published by . This book was released on 1973 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal of Animal Science written by and published by . This book was released on 1988 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Information Resources on the Care and Welfare of Beef Cattle by : Cynthia Petrie Smith
Download or read book Information Resources on the Care and Welfare of Beef Cattle written by Cynthia Petrie Smith and published by . This book was released on 2004 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the main animal welfare concerns in beef cattle production is that of pain and distress. Dehorning, castration, and branding are husbandry procedures which can cause pain and discomfort. Less acute but still distressful are those issues related to the animal environment. Extreme natural conditions can result in cattle that are heat and/or cold stressed. Drought and the resulting overstocking for available feed resources can also reduce body fatness. These are important welfare issues in modern beef production. The following bibliography explores these issues and more and should provide a useful resource for scientists, veterinarians, extension specialists, students, and others.
Book Synopsis New Zealand Journal of Agricultural Research by :
Download or read book New Zealand Journal of Agricultural Research written by and published by . This book was released on 1986 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Zimbabwe Agricultural Journal written by and published by . This book was released on 1982 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt:
