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Author : Haymchal Harricharan
Publisher :
ISBN 13 :
Total Pages : 166 pages
Book Rating : 4.E/5 ( download)
Download or read book Estimates of Some Genetic Parameters of Economic Importance in Angus Cattle written by Haymchal Harricharan and published by . This book was released on 1967 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Lee Evans
Publisher :
ISBN 13 :
Total Pages : 110 pages
Book Rating : 4.:/5 (31 download)
Download or read book Estimates of Genetic Parameters Necessary for Constructing Selection Indexes for Beef Cattle written by Lee Evans and published by . This book was released on 1956 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : David Wain Schafer
Publisher :
ISBN 13 :
Total Pages : 236 pages
Book Rating : 4.:/5 (87 download)
Download or read book Estimation of Genetic Parameters and Time Trends in a Herd of Angus Cattle written by David Wain Schafer and published by . This book was released on 1987 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Miroslav Kaps
Publisher :
ISBN 13 :
Total Pages : 230 pages
Book Rating : 4.:/5 (422 download)
Download or read book Growth and Maturation of Angus Cattle written by Miroslav Kaps and published by . This book was released on 1997 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this study was to estimate genetic parameters for growth, maturity and carcass traits, and to analyze relationship of each of these traits with mature weight. Growth data utilized in the study consisted of repeated weight measurements of 3044 Angus cows. A Brody growth curve was fitted to the data for each cow individually in order to predict asymptotic (mature) weight, age when animal reached 65% of mature weight, and weights, growth rates, degrees of maturity and relative growth rates at 365 and 550 days of age. Carcass data consisted of 3477 records of steers, including hot carcass weight, back fat-thickness, rib-eye area, cutability and marbling score. Genetic parameters of mature weight were estimated from a single-trait animal model for asymptotic weight, a two-trait animal model for asymptotic and weaning weight, and a two-trait animal model for repeated mature weights (measured after 4 y of age) and weaning weight. Heritability estimates for growth and carcass traits were obtained by restricted maximum likelihood from a set of two-trait animal models considering a given trait and weaning weight which was in the model to account for any effect of culling. Similarly, genetic correlations between mature weight and other traits were obtained from a set of three-trait models. A sample of 29943 animals was used for weaning weight measurements. Fixed effects in the models included weaning, cow and carcass contemporary groups. For the carcass traits the effect of slaughter age was included in the model as a covariate. Random effects in the model included direct genetic, maternal genetic and permanent environmental effects for weaning weight, but only direct genetic and repeated measurements (if in the model) for each of the other traits. Estimates of heritability for mature weight were. 44,.51 and. 57 for the single-trait model with asymptotic weight, two-trait model with asymptotic weight and two-trait model with repeated weights, respectively. The reduced heritability estimate from the single-trait model was most likely due to the effect of culling, thus, a genetic evaluation for mature size should be considered in a multiple-trait model including mature weight as well as some earlier measured growth trait. (Abstract shortened by UMI.).
Author : Marion Fitzgerald
Publisher :
ISBN 13 :
Total Pages : 216 pages
Book Rating : 4.:/5 (131 download)
Download or read book Estimates of Genetic Parameters of Certain Production and Carcass Traits in Beef Cattle written by Marion Fitzgerald and published by . This book was released on 1961 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Brady Robert Jensen
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (1 download)
Download or read book Genetic Parameter Estimates for Feet and Leg Traits in Red Angus Cattle written by Brady Robert Jensen and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this study was to investigate the parameter estimates for feet and leg traits, relationships within feet and leg traits, and between feet and leg traits and production traits in Red Angus cattle. Subjective scores for 14 traits including: Body Condition Score (BCS), Front Hoof Angle (FHA), Front Heel Depth (FHD), Front Claw Shape (FCS), Rear Hoof Angle (RHA), Rear Heel Depth (RHD), Rear Claw Shape (RCS), Size of Hoof (Size), Front Side View (FSV), Knee Orientation (KNEE), Front Hoof Orientation (FHO), Rear Side View (RSV), Rear View (RV), and a Composite Score (COMP) were collected by trained evaluators on 1885 Red Angus cattle at different ranches across the United States. A three-generation pedigree file was obtained from the Red Angus Association of America (RAAA) that contained 13,306 animals, and EPDs on all animals with feet and leg scores were obtained. All traits except COMP were scored as intermediate optimum traits. Data were modeled using a linear bivariate animal model with random additive genetic and residual effects, and fixed effects of age and contemporary group (herd-year). Variances were estimated with ASREML 3.0 and 4.0. Heritability estimates of BCS, FHA, FHD, FCS, RHA, RHD, RCS, Size, FSV, Knee, FHO, RSV, RV, and COMP were 0.11, 0.20, 0.17, 0.09, 0.19, 0.25, 0.17, 0.36, 0.16, 0.17, 0.17, 0.30, 0.14, and 0.12, respectively. These results showed feet and leg traits were lowly to moderately heritable. Strong, positive genetic correlations were found between FHA and FHD (0.89), FHA and RHA (0.88), FHD and RHA (0.85), FHA and RHD (0.85), FHD and RHD (0.94), and FHO and Knee (0.95), indicating these traits may be highly related to one another. Strong negative correlations were found between Knee and FSV ( -0.59) and FHO and FSV ( -0.75). The strongest correlation was between front limb traits (FHA, FHD, FSV, FHO, Knee, and Comp) and the Stayability EPD (STAY) was FSV (r =0.16; r_s =0.20) and for rear limb traits (RHA, RHD, RCS, RSV, RV, and Comp) and STAY was RCS (r = -0.12; r_s=-0.14). This indicates that cattle with more slope to the angle of the shoulder stay in the herd longer and cattle with less curl to the inside of the claw tend to stay in the herd longer. Further studies with more data could help validate the relationship between feet and leg traits and production traits.
Author : Dixon D. Hubbard
Publisher :
ISBN 13 :
Total Pages : 84 pages
Book Rating : 4.:/5 (319 download)
Download or read book Guidelines for Uniform Beef Improvement Programs written by Dixon D. Hubbard and published by . This book was released on 1981 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Donald Franklin Butcher
Publisher :
ISBN 13 :
Total Pages : 158 pages
Book Rating : 4.:/5 (356 download)
Download or read book The Effect of Selection on Estimates of Genetic Parameters written by Donald Franklin Butcher and published by . This book was released on 1965 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Adolfo Pérez Márquez
Publisher :
ISBN 13 :
Total Pages : 324 pages
Book Rating : 4.:/5 (318 download)
Download or read book Estimates of Genetic Parameters for Crossbred Beef Cattle written by Adolfo Pérez Márquez and published by . This book was released on 1994 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Brian Wayne Kennedy
Publisher :
ISBN 13 :
Total Pages : 500 pages
Book Rating : 4.E/5 ( download)
Download or read book Estimates of Genetic, Environmental and Phenotypic Parameters in the Canadian Record of Performance Beef Cattle Population written by Brian Wayne Kennedy and published by . This book was released on 1974 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Theodore R. Rounsaville
Publisher :
ISBN 13 :
Total Pages : 202 pages
Book Rating : 4.E/5 ( download)
Download or read book Estimation of Phenotypic, Genetic, and Environmental Parameters in Two Beef Cattle Populations written by Theodore R. Rounsaville and published by . This book was released on 1971 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Michael J. Fields
Publisher : CRC Press
ISBN 13 : 100015288X
Total Pages : 414 pages
Book Rating : 4.0/5 (1 download)
Download or read book Factors Affecting Calf Crop written by Michael J. Fields and published by CRC Press. This book was released on 2021-11-18 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt: Factors Affecting Calf Crop summarizes the latest information available from leading cattle physiologists and geneticists regarding factors known to influence the production of live calves at weaning. You get practical information on management techniques for improving reproduction efficiency in the herd. You'll also learn about the functioning of the reproductive system and how this may affect reproductive processes in the cow herd. Managers will benefit from a clearer understanding of the factors known to limit efficient reproduction, while veterinarians and other professionals who advise cattlemen will appreciate the substantial reference material and color photographs for defining cow condition scores. Color photographs are also used to illustrate the discussions of testicular thermographies and their applications. Other chapters in the book cover developments in improving reproductive performance of the replacement heifer, the brood cow, and the bull. Topics on reproduction include physiology/endocrinology, the use of growth promotants, genetics and physiological and economic considerations in selecting the age to breed heifers, heritability of fertility, length of the breeding season, prepartum and postpartum nutrition, nursing by the calf, cloning of embryos, and much more.
Author : A. J. Sutton
Publisher : Wiley-Blackwell
ISBN 13 :
Total Pages : 360 pages
Book Rating : 4.3/5 (91 download)
Download or read book Methods for Meta-Analysis in Medical Research written by A. J. Sutton and published by Wiley-Blackwell. This book was released on 2000-12-19 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: Major text including chapters on the following: defining outcome measures; assessing heterogeneity; using fixed effects methods and random effects models for combining study estimates; publication bias.
Author : Tony J. Cunha
Publisher :
ISBN 13 :
Total Pages : 240 pages
Book Rating : 4.:/5 (319 download)
Download or read book Crossbreeding Beef Cattle written by Tony J. Cunha and published by . This book was released on 1963 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains reports presented by speakers at the Beef Cattle Short Course on Crossbreeding which was held at the University of Florida, April 12-14, 1961. The Short Course was designed to bring together the availabre information on crossbreeding of beef cattle. Accordingly, this book is a summary of what is presently known about this subject. It includes reports from Florida, Texas, Louisiana, Georgia, and other areas where considerable crossbreeding work with Brahman and British breeds is being conducted.
Author :
Publisher :
ISBN 13 :
Total Pages : 792 pages
Book Rating : 4.:/5 (36 download)
Download or read book Cuban Journal of Agricultural Science written by and published by . This book was released on 1982 with total page 792 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 962 pages
Book Rating : 4.:/5 (43 download)
Download or read book Journal of Animal Science written by and published by . This book was released on 1991 with total page 962 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : 1. WORLD CONGREES ON GENETICS APPLIED TO LIVESTOCK PRODUCTION (1974, Madrid, Spain)
Publisher :
ISBN 13 :
Total Pages : 1258 pages
Book Rating : 4.:/5 (31 download)
Download or read book 1st World Congress on Genetics Applied to Livestock Production: Symposia written by 1. WORLD CONGREES ON GENETICS APPLIED TO LIVESTOCK PRODUCTION (1974, Madrid, Spain) and published by . This book was released on 1974 with total page 1258 pages. Available in PDF, EPUB and Kindle. Book excerpt: V.2 - Round tables.
