Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Variance And Covariance Component Estimation Of Reproductive Traits In A Multibreed Beef Cattle Herd Applying Linear And Threshold Models
Download Variance And Covariance Component Estimation Of Reproductive Traits In A Multibreed Beef Cattle Herd Applying Linear And Threshold Models full books in PDF, epub, and Kindle. Read online Variance And Covariance Component Estimation Of Reproductive Traits In A Multibreed Beef Cattle Herd Applying Linear And Threshold Models ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Variance and Covariance Component Estimation of Reproductive Traits in a Multibreed Beef Cattle Herd Applying Linear and Threshold Models by : Robert Rolfe Van der Westhuizen
Download or read book Variance and Covariance Component Estimation of Reproductive Traits in a Multibreed Beef Cattle Herd Applying Linear and Threshold Models written by Robert Rolfe Van der Westhuizen and published by . This book was released on 2001 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Restricted Maximum Likelihood Estimation of Variance Components for Multiple Traits with Missing Observations and an Application to Beef Cattle by : Dorian John Garrick
Download or read book Restricted Maximum Likelihood Estimation of Variance Components for Multiple Traits with Missing Observations and an Application to Beef Cattle written by Dorian John Garrick and published by . This book was released on 1988 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography of Agriculture written by and published by . This book was released on 1985 with total page 1364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Moment-type Estimation of Genetic Parameters and Their Variances for Calving Date and Production Traits from Hereford Data Using Multi-way Models by : Edward J. Otieno-Rege
Download or read book Moment-type Estimation of Genetic Parameters and Their Variances for Calving Date and Production Traits from Hereford Data Using Multi-way Models written by Edward J. Otieno-Rege and published by . This book was released on 1985 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Multiple Trait Variance-covariance Component Estimation Procedures with Missing Information for Some Traits by : Jose Valente
Download or read book Multiple Trait Variance-covariance Component Estimation Procedures with Missing Information for Some Traits written by Jose Valente and published by . This book was released on 1988 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: Material and methods; General multivariate linear model; Restricted maximum likelihood equations; Shortcut approach; Em algorithms; Canonical transformation; Generation of data sets for testing and validation DHIA production and reproduction data; Convergence criteria; Good and poor priors.
Book Synopsis Estimation of Heterogeneous Components of Variance in Mixed Linear Models with an Application to Dairy Cattle Breeding by : Kent Alan Weigel
Download or read book Estimation of Heterogeneous Components of Variance in Mixed Linear Models with an Application to Dairy Cattle Breeding written by Kent Alan Weigel and published by . This book was released on 1992 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Parameter Estimation for Carcass Traits Including Growth Information of Simmental Beef Cattle Using Restricted Maximum Likelihood with a Multiple-trait Model by : Brent Wayne Woodward
Download or read book Parameter Estimation for Carcass Traits Including Growth Information of Simmental Beef Cattle Using Restricted Maximum Likelihood with a Multiple-trait Model written by Brent Wayne Woodward and published by . This book was released on 1990 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Variance Components and Animal Breeding by : Lloyd Dale Van Vleck
Download or read book Variance Components and Animal Breeding written by Lloyd Dale Van Vleck and published by . This book was released on 1979 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Topics Relating to the Variance and Covariance Components Needed to Evaluate Animals Genetically by : William Donald Slanger
Download or read book Topics Relating to the Variance and Covariance Components Needed to Evaluate Animals Genetically written by William Donald Slanger and published by . This book was released on 1975 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Harris Benedict Wright Publisher :Ann Arbor, Mich. : University Microfilms International ISBN 13 : Total Pages :288 pages Book Rating :4.E/5 ( download)
Book Synopsis Estimation of (co)variance Components to Perform a Multiple Trait Sire Evaluation for Canadian Simmental Cattle by : Harris Benedict Wright
Download or read book Estimation of (co)variance Components to Perform a Multiple Trait Sire Evaluation for Canadian Simmental Cattle written by Harris Benedict Wright and published by Ann Arbor, Mich. : University Microfilms International. This book was released on 1987 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Guidelines for Uniform Beef Improvement Programs by : Dixon D. Hubbard
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:
Book Synopsis Variance Component Estimation for Reproductive Traits and Analyses of Myofibrillar Proteins and Age at Puberty in Angus Beef Cattle Divergently Selected for Blood Serum Insulin-like Growth Factor i Concentration by : Ahmet Yilmaz
Download or read book Variance Component Estimation for Reproductive Traits and Analyses of Myofibrillar Proteins and Age at Puberty in Angus Beef Cattle Divergently Selected for Blood Serum Insulin-like Growth Factor i Concentration written by Ahmet Yilmaz and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: The first objective of this study was to obtain (co)variance component estimates for reproductive traits of beef cattle. Heritabilities for insulin-like growth factor I (IGF-I) concentration of three blood samples collected at d 28, 42, and 56 of the 140-d postweaning test, which are abbreviated as IGF28, IGF42, and IGF56, espectively, and mean IGF-I were 0.32, 0.34, 0.30, and 0.32, respectively. Heritabilities for scrotal circumference, percent sperm motility, percent normal sperm cells, age of heifers at first calving, and calving rate were 0.51, 0.09, 0.43, 0.26, and 0.13, respectively. The calving rate data were entered as either 1 (if conceived) or 100 (if not conceived). Additive genetic correlations of scrotal circumference, percent motile sperm cells, and calving rate with mean IGF-I concentration were 0.35, 0.43, and 60.41, respectively. These results suggest that selection for increased serum IGF-I concentration should increase scrotal circumference, percent motile sperm cells, and calving rate. The second objective in this study was to examine effects of high or low blood serum IGF-I concentration on age of heifers at puberty. Results of a progesterone assay showed that age at puberty did not differ between heifers in the high and low IGF-I selection lines. A cubic relationship existed between age at puberty and mean IGF-I concentration. Residual correlations of age at puberty with IGF-I measurements tended to be negative and nonsignificant. The third objective of this study was to examine effects of high or low blood serum IGF-I concentration on expression of myofibrillar proteins. Troponin C levels were higher in the high IGF-I line bulls and myosin light chain 2 levels were higher in the low IGF-I line bulls. Although their levels did not differ between the high and low IGF-I lines, desmin and the 32 kDa protein had significant correlations with IGF-I concentration. Coefficients for the quadratic regression of density of desmin on IGF28, IGF42, and mean IGF-I were significant. Cubic relationships existed between density of 32 kDa protein and IGF56 and mean IGF-I. Results from this study indicate that serum IGF-I concentrations are genetically correlated with reproductive traits, there are some IGF-I selection line effects on expression of myofibrillar proteins, and selection for blood serum IGF-I does not change age of heifers at puberty.
Book Synopsis Estimation of Genetic (co)variances for Production, Survival and Reproduction by : Man-Cang Dong
Download or read book Estimation of Genetic (co)variances for Production, Survival and Reproduction written by Man-Cang Dong and published by . This book was released on 1987 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Linear Models for the Prediction of the Genetic Merit of Animals, 4th Edition by : Raphael Mrode
Download or read book Linear Models for the Prediction of the Genetic Merit of Animals, 4th Edition written by Raphael Mrode and published by CABI. This book was released on 2023-10-09 with total page 409 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fundamental to any livestock improvement programme by animal scientists, is the prediction of genetic merit in the offspring generation for desirable production traits such as increased growth rate, or superior meat, milk and wool production. Covering the foundational principles on the application of linear models for the prediction of genetic merit in livestock, this new edition is fully updated to incorporate recent advances in genomic prediction approaches, genomic models for multi-breed and crossbred performance, dominance and epistasis. It provides models for the analysis of main production traits as well as functional traits and includes numerous worked examples. For the first time, R codes for key examples in the textbook are provided online. Suitable for graduate and postgraduate students, researchers and lecturers of animal breeding, genetics and genomics, this established textbook provides a thorough grounding in both the basics and in new developments of linear models and animal genetics.
Book Synopsis Genetic Parameters in Straightbred and Crossbred Beef Cattle Populations by : Richard John Dunn
Download or read book Genetic Parameters in Straightbred and Crossbred Beef Cattle Populations written by Richard John Dunn and published by . This book was released on 1968 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advances in Statistical Methods for Genetic Improvement of Livestock by : Daniel Gianola
Download or read book Advances in Statistical Methods for Genetic Improvement of Livestock written by Daniel Gianola and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt: Developments in statistics and computing as well as their application to genetic improvement of livestock gained momentum over the last 20 years. This text reviews and consolidates the statistical foundations of animal breeding. This text will prove useful as a reference source to animal breeders, quantitative geneticists and statisticians working in these areas. It will also serve as a text in graduate courses in animal breeding methodology with prerequisite courses in linear models, statistical inference and quantitative genetics.
Book Synopsis Genetic Variance and Covariance Compenents for Feed Intake, Average Daily Gain, and Postweaning Gain and Indices to Improve Feed Efficiency in Growing Beef Cattle by : Kelli June Retallick
Download or read book Genetic Variance and Covariance Compenents for Feed Intake, Average Daily Gain, and Postweaning Gain and Indices to Improve Feed Efficiency in Growing Beef Cattle written by Kelli June Retallick and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Feed is the single most expensive cost related to beef cattle production. Currently a 70 d performance test is recommended for accurate calculation of efficiency. Previous research has suggested intake tests can be limited to 35 d. Objectives of this study were to estimate genetic parameters for growth and intake traits, compare two alternative indices for feed efficiency, and quantify the genetic response to selection for feed efficiency combining an intake test with two types of gain data. On-test average daily feed intake (ADFI), on-test average daily gain (ADG), and postweaning gain (PWG) records on 5,606 growing steers and heifers were obtained from the U.S. Meat Animal Research Center in Clay Center, NE. On-test ADFI and ADG data were collected from a minimum of 62 to 148 d testing days. Independent quadratic regressions were fitted for body weight on time, and on-test ADG was predicted from the resulting equations. PWG was calculated by subtracting adjusted 205-d weights from 365-d weights and dividing by 160. Genetic correlations were estimated using multiple trait animal mixed models with ADG, ADFI, and PWG for both sexes as dependent variables. The genetic correlations between ADG and PWG for both steers (0.81) and heifers (0.65) were strong. This indicates PWG is a strong proxy for ADG on-test and long test periods may not be necessary. Indices combining EBVs for ADFI and ADG and for ADFI and PWG were evaluated. For each index, the weighting of gain was arbitrarily set to 1.0 and the weighting for ADFI was the negative of the average of the intra-contemporary group ratio of mean gain divided by mean ADFI. Values were combined with EBV to compute two index values per animal. Pearson correlations for steers (0.96) and heifers (0.45) indicated a strong relationship for steers between the indices. Because more animals can be measured for intake, using PWG increases genetic progress of selection for feed efficiency by 15-17% per year. These findings support using PWG data in combination with ADFI to determine efficient animals, lessen costs, and increase annual feed efficiency genetic change.
