Download or read book Environmental and Genetic Effects on the Weaning Weight of Hereford Calves written by James Bradford Burgess and published by . This book was released on 1953 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Genetic and Environmental Factors on Weaning Weight of Hereford Calves written by James Andrew Carpenter and published by . This book was released on 1961 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Estimation of Genetic and Environmental Parameters of Weaning Weight and Weaning Grade in Hereford Cattle written by Kurt Eberhard Sittmann and published by . This book was released on 1963 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Inbreeding and Environmental Factors on the Weaning Weight and Post weaning Growth of Range Hereford Cattle written by Geoffrey Oswald Harwin and published by . This book was released on 1963 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present study was initiated to determine the effects of inbreeding and certain environmental and genetic factors on the weaning weight of range Hereford calves. The study was also extended to include an investigation of the effect of these variables on post-weaning traits of range Hereford females including yearling gain and weight at 18 months, 2 1/2 years and 3 1/2 years of age. The data used in the study were obtained from a long term cattle breeding project initiated by Colorado State University in 1946 at the San Juan Basin Experiment Station and included onservations from 16 inbred lines of Hereford cattle, crosses between yhese lines and a control herd. The preliminary phase of the study was concerned with the development of appropriate mathematical models enabling minimum variance unbiased estimates of the various genetic and ebvironmental factors under investigation. The interactions between the various main effects as they affect weaning weight were investigated simultaneously by means of a least squares analysis. The interactions of sex x mating system, sex x age of dam and year x age of dam were significant. Investigation of the within year regression of weaning weight on age of calf also indicated a significant interaction between age of calf and year. Preleminary investigation indicated a marked curvilinear decline in weaning weight with inbreeding and differential response to inbreeding of both lines and sexes. The results of the preliminary studies were used in developing the final models...
Download or read book The Genetic and Environmental Aspects of Maternal Effects Upon Weaning Weight of Beef Calves written by Richard Carroll Thomas and published by . This book was released on 1968 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Genetic and Environmental Factors Affecting the Performance of Hereford Calves from Birth to Weaning written by Shanmugampillay Loganathan and published by . This book was released on 1962 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Some Factors Affecting Weaning Weights and Weaning Scores in Beef Calves written by James S. Brinks and published by . This book was released on 1957 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetic and Environmental Factors Influencing the Weaning Weight of Beef Calves written by Missouri-Columbia. Agricultural Experiment Station and published by . This book was released on 1963 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetic and Environmental Factors Influencing the Weaning Weight of Beef Calves written by Homer Bronstetter Sewell and published by . This book was released on 1963 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
Download or read book Some Genetic and Environmental sic Factors Affecting Weaning Weight and Weaning of Grade in Angus Cattle in South Texas written by Paige Allan Stasney and published by . This book was released on 1971 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
Download or read book A Biometrical Study of Weight of Angus and Hereford Cows and Growth of Their Progeny written by Larry Arnold Nelson and published by . This book was released on 1967 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetic Parameters For Docility Weaning Weight Yearling Weight And Intramuscular Fat Percentage In Hereford Cattle written by José Antonio Torres Vázquez and published by . This book was released on 2016 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Temperament in cattle can be described as the reactivity or fear response to human handling, and it is important to beef cattle producers not only from a human safety but also due to potential correlations with other economically traits. Before a docility selection metric can be added to a genetic evaluation, any potential antagonisms with economically relevant traits should be quantified. The objective was to estimate genetic parameters, including genetic correlations, for chute score (CS), weaning weight (WW), yearling weight (YW), and intramuscular fat percentage (IMF) in Hereford cattle. Single-trait and bivariate animal models were used to estimate heritabilities and genetic correlations. Models included fixed effects of sex and contemporary group, defined as herd–year–season. Direct genetic and residual components were included as random effects. For CS and WW, also additional random effects of maternal genetic and maternal permanent environment were fitted. For CS, WW, YW, and IMF, heritability estimates were 0.27 ± 0.02, 0.35 ± 0.03, 0.36 ± 0.02, and 0.27 ± 0.02, respectively. Genetic correlations between CS and WW, CS and YW, CS and IMF, WW and YW, WW and IMF, and YW and IMF were –0.12 ± 0.06, –0.10 ± 0.05, –0.08 ± 0.06, 0.47 ± 0.05, –0.19 ± 0.09, and –0.41 ± 0.05, respectively. Heritability estimates for all traits suggest that they would respond favorably to selection, although the selection for increased WW or YW could decrease marbling, which is often associated with favorable meat quality. Genetic correlations between CS and WW, YW, and IMF were all favorable but weak, suggesting that selection for improved docility will not have negative consequences on growth or meat quality. Maternal additive and maternal permanent environmental variances for CS were close to zero, suggesting that their inclusion in National Cattle Evaluations is not warranted.
Download or read book Some Genetic and Environmental Factors Influencing the Weaning Weights of Southwestern Range Cattle written by Otto Floyd Pahnish and published by . This book was released on 1958 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research Bulletin written by Satya Narayan Pani and published by . This book was released on 1971 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
