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Estimates Of Genetic Parameters And Responses To Selection In Meat Type Poultry Populations
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Book Synopsis Estimates of Genetic Parameters and Responses to Selection in Meat Type Poultry Populations by : Terry Brank Kinney
Download or read book Estimates of Genetic Parameters and Responses to Selection in Meat Type Poultry Populations written by Terry Brank Kinney and published by . This book was released on 1962 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Genetics of Body Weight and Feed Efficiency in Broiler Chickens by :
Download or read book The Genetics of Body Weight and Feed Efficiency in Broiler Chickens written by and published by . This book was released on 2019 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Genetic Evaluation and Selection in Egg-laying Poultry by : M. Gilbert Jeyaruban
Download or read book Genetic Evaluation and Selection in Egg-laying Poultry written by M. Gilbert Jeyaruban and published by . This book was released on 1992 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: Estimation of genetic paramenters from a selected population using an animal model was studied along with several problems in optimization of selection response with an acceptable rate of imbreeding in poultry populations using various methods of genetic evaluation, restrictions on selection, mating ratios and population sizes. The genetic parameters for 6 recent generations of a selected commercial egg-laying poultry popuolation were estimated using a derivative free restricted maximum likeihood procedure based on an animal model. The estimated genetic variances for five economically important traits were found to be influenced by the number of generations of data used in the evaluation. This in the evaluation. This finding was examined in a simulation study with different population sizes and different selection intensities for males and females. A normal and a sex-limited trait, both with heritabilities of 0.1 or 0.5 were considered. Estimated additive genetic variance for both the normal and sex-limited trait with a heritability of 0.1 did not show any clear trend as the number of generations of data were increased. But for a heritability of 0.5, the estimated geneticvariances decreased as the number of generations used in the estimation decreased. Use of two generations data led to underestimates of truegenetic variance and use of 5 generations led to over estimates. The exact combination of conditions leading to these biases was not identified and the need for further research was highlighted. The diferences in genetic response and rate of inbreeding were examined by stochasticsimulation of egg-laying poultry selection stocks for traits with heritabilities of 0.1, 0.2 and 0.5 when selecting on estimated breeding values using an individual animal model evaluation (BLUP) or evaluation based on family selecting indexes. The BLUP evaluation gave slightly higher selection responses then the selection indexes, with the differences being almost non-existent at high heritability. But BLUP also gave considerably higher rates then selection indexes. Thus, on the basisof response and inbreeding there seems to be advantage to applying BLUP evaluations for egg-laying poultry stocks. The effects of mating ratio, population size and restrictions on the selecton of close relatives on the selection response and rate of inbreeding were examined by stochastic simulation. Selecton was based on an index comprising 3 economically important traits in egg-laying poultry. The simulation resultsshowed thet population size of around 3000 recorded females and a mating ratio in the range of 1:8 to 1:6 (male:female) would be appropriateto get good selection responses (about $8.5 Cdn. after generation 10) with moderate rates of inbreeding (about 1.2 to 1.5% per generation).
Book Synopsis Estimation of Genetic Parameters Under Optimal and Suboptimal Environments for Body Weight in Chicken Using a Diallel Mating System by : Mohamed Hanafi Sayed Mahmoud
Download or read book Estimation of Genetic Parameters Under Optimal and Suboptimal Environments for Body Weight in Chicken Using a Diallel Mating System written by Mohamed Hanafi Sayed Mahmoud and published by . This book was released on 1966 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: A 2 x 2 x 2N confounded diallel mating design (2 series, 2 males, N females per male per series) was used to obtain estimates of the genetic parameters in body weight traits in a noninbred population of New Hampshire chickens grown on 18% and 24% protein rations. Individual selection also was applied to evaluate the reliability of the genetic parameters obtained under each protein level. The analysis showed an extremely large contribution of series effects to the total variation in the traits which was attributed to the environmental influences from one series to the other and to the maternal environment. The component of variance due to series x male interaction was found to be small or zero under the 24% protein ration. An optimal environment may have given certain genotypes a greater opportunity to adapt to the environment. The higher estimates of the component of variance of series x female interaction for one-day body weight suggests the influence of maternal effects from one series to the other and from one dam to the other. Generally, estimates for the component of variance of male effects were higher under the 18% protein ration than under the 24% protein ration. Conversely, the component of variance of female effects showed higher values under the 24% protein ration than under 18% protein ration for most of the traits considered. ...
Book Synopsis A Genetic Analysis of a Poultry Breeding Program by : Sylvester Nzebunwa Ibe
Download or read book A Genetic Analysis of a Poultry Breeding Program written by Sylvester Nzebunwa Ibe and published by . This book was released on 1981 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Estimation of Genetic Parameters for Different Cardiovascular Defects in Meat-type Chickens by :
Download or read book Estimation of Genetic Parameters for Different Cardiovascular Defects in Meat-type Chickens written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Poultry Genetics, Breeding and Biotechnology by : W.M. Muir
Download or read book Poultry Genetics, Breeding and Biotechnology written by W.M. Muir and published by Lulu.com. This book was released on 2003 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation. In this comprehensive research book issues associated with poultry breeding are addressed, by examining quantitative and molecular genetics and the uses of transgenic technology. The important area of disease resistance and transmission is also covered in a special section looking at the genetics of disease resistance. This book represents the first complete integration of our current knowledge of biotechnology and quantitative and molecular genetics as applied to poultry breeding.
Book Synopsis A Summary of Reported Estimates of Heritabilities and of Genetic and Phenotypic Correlations for Traits of Chickens by : Terry B. Kinney
Download or read book A Summary of Reported Estimates of Heritabilities and of Genetic and Phenotypic Correlations for Traits of Chickens written by Terry B. Kinney and published by . This book was released on 1969 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Genetics and the Behavior of Domestic Animals by : William M. Muir
Download or read book Genetics and the Behavior of Domestic Animals written by William M. Muir and published by Elsevier Inc. Chapters. This book was released on 2013-04-22 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many behaviors in poultry can be modified by genetic selection. Selection of laying hens for maximum egg production had the unfortunate side effect of increased rates of beak inflicted damage on other birds. Selective breeding has eliminated broodiness and has either increased or decreased other behaviors, such as hysteria, fearfulness, appetite in broilers, social dominance, ability and damage to other birds. Genetic selection can be used to reduce behaviors that cause welfare problems. However, it must be approached with caution to avoid unintended consequences that would be detrimental to welfare. A calm, docile bird that appears behaviorally calm, may take longer for its heart rate to return to normal after it is frightened. The use of group selection instead of single-bird selection can be effectively used to reduce undesirable behaviors such as feather pecking and to maintain high egg production. An entire group of birds is selected instead of selecting individuals.
Book Synopsis Recurrent Selection and Genetic Parameters of Economic Importance in the Domestic Fowl by : Luther David Andrews
Download or read book Recurrent Selection and Genetic Parameters of Economic Importance in the Domestic Fowl written by Luther David Andrews and published by . This book was released on 1966 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Poultry Genetics, Breeding, and Biotechnology by : W. M. Muir
Download or read book Poultry Genetics, Breeding, and Biotechnology written by W. M. Muir and published by CABI. This book was released on 2003-06-18 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive research book represents the first complete integration of current knowledge in this area. It addresses issues associated with poultry breeding particularly by examining quantitative and molecular genetics and the uses of transgenic technology. A special section covers the important area of disease resistance and transmission.
Download or read book Dissertation Abstracts written by and published by . This book was released on 1964-09 with total page 1366 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effect of Selection on Estimates of Genetic Parameters by : Donald Franklin Butcher
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:
Download or read book Poultry Science written by and published by . This book was released on 1996 with total page 1092 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vol. 5 includes a separately paged special issue, dated June 1926.
Book Synopsis Weighted Least Squares Estimates of Genetic Parameters in Chickens by : Martinho de Almeida e Silva
Download or read book Weighted Least Squares Estimates of Genetic Parameters in Chickens written by Martinho de Almeida e Silva and published by . This book was released on 1974 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Selection Response and the Nature of Genetic Variation for Eight-week Body Weight in the Domestic Fowl by : Dalbir Singh
Download or read book Selection Response and the Nature of Genetic Variation for Eight-week Body Weight in the Domestic Fowl written by Dalbir Singh and published by . This book was released on 1968 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book National Union Catalog written by and published by . This book was released on 1956 with total page 634 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes entries for maps and atlases.
