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Genotype X Environment Interactions In Sheep
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Book Synopsis Genotype X Environment Interactions in Sheep by : Kathleen Steele Corum
Download or read book Genotype X Environment Interactions in Sheep written by Kathleen Steele Corum and published by . This book was released on 1974 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 865 ewe production records taken from three lamb crops, were analyzed to study breed effects, heterosis, environmental effects and interactions between them, and breed and heterosis x environment interaction effects on ewe production traits. In each of two environments, approximately 144 ewes were mated in a three breed reciprocal cross design each year. The resulting 757 parturitions produced 1263 lambs. Hampshire, Suffolk and Willamette sheep from university flocks were used. Two rams of each breed were used in each environment each year. One location was rolling hill land, the other was level, irrigated, valley bottom land, both near Corvallis, Oregon. Least squares analyses of variance were computed on ewe production traits which included fertility, lambs born, percent survival to weaning, lambs weaned and pounds of lamb weaned. None of the effects tested in the analysis of fertility showed significance. On the other traits, year was significant except for survival. Location was significant for pounds weaned per ewe mated and for lambs born, percent weaned and pounds weaned per ewe lambing. The main effect of the hill land was superior except for lambs born per ewe which lambed. Dam age was significant except for survival. The age effect on fertility was not tested. Otherwise production increased with age. Dam weight change during the mating season was significant for pounds weaned per ewe mated and for prolificacy. Pounds weaned increased with weight gain while prolificacy decreased. Lambing date was significant for lambs born and lambs weaned per ewe lambing. Prolificacy increased as the lambing season progressed. Location x year interaction effects on pounds of lamb weaned per ewe mated and on lambs weaned, percent weaned and pounds of lamb weaned per ewe which lambed were significant. Dam breed and dam x location interaction were significant for pounds weaned per ewe mated. The overall and hill land ranking of ewe breeds was Willamette, Suffolk, then Hampshire. The interaction re. sulted primarily from a disproportionate increase in the performance of the Willamette ewes on the hill land. The Suffolk ewes were superior on the irrigated pasture. This suggests that a superior adaptation of Willamette ewes to hill land has resulted during their development and selection there. Sire x year was significant for lambs born. The interaction effect alone, however, in no case was more than 0.10 lamb so its importance is questionable. Heterosis and heterosis x location interaction were significant for pounds weaned per ewe mated. Heterosis was 31.3% for pounds weaned per ewe mated on the valley pasture and 8.2% on the hill pasture. These results suggest that heterosis is greater when conditions for the expression of a given trait are suboptimal.
Book Synopsis Genotype by Environment Interactions in Production Traits of Sheep by : A. P. Mavrogenis
Download or read book Genotype by Environment Interactions in Production Traits of Sheep written by A. P. Mavrogenis and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Genotype-environment Interaction in Production Traits of Sheep by : Abdel Hamid Osman
Download or read book Genotype-environment Interaction in Production Traits of Sheep written by Abdel Hamid Osman and published by . This book was released on 1965 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Genotype-environment Interaction in Sheep & Pigs, 1972-1978 by :
Download or read book Genotype-environment Interaction in Sheep & Pigs, 1972-1978 written by and published by . This book was released on 1985 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Genotype X Environment Interaction in Merino Sheep in Western Australia with Special Consideration of the Effects on Index Selection by : Sonja Dominik
Download or read book Genotype X Environment Interaction in Merino Sheep in Western Australia with Special Consideration of the Effects on Index Selection written by Sonja Dominik and published by . This book was released on 2001 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Genotype X Environment Interactions in Animals by : Basil Leon McIntyre
Download or read book Genotype X Environment Interactions in Animals written by Basil Leon McIntyre and published by . This book was released on 1972 with total page 760 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Genotype-environment Interactions in Lamb Mortality with Particular Reference to Birth Coat and Haemoglobin Type by : John Marcus Obst
Download or read book Genotype-environment Interactions in Lamb Mortality with Particular Reference to Birth Coat and Haemoglobin Type written by John Marcus Obst and published by . This book was released on 1970 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Genotype - Environment Interactions and Genetic Parameters in New Zealand Romney Sheep by : Subhash Chander Chopra
Download or read book Genotype - Environment Interactions and Genetic Parameters in New Zealand Romney Sheep written by Subhash Chander Chopra and published by . This book was released on 1978 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Adaptation and Fitness in Animal Populations by : Julius van der Werf
Download or read book Adaptation and Fitness in Animal Populations written by Julius van der Werf and published by Springer Science & Business Media. This book was released on 2008-10-17 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fitness and adaptation are fundamental characteristics of plant and animal species, enabling them to survive in their environment and to adapt to the inevitable changes in this environment. This is true for both the genetic resources of natural ecosystems as well as those used in agricultural production. Extensive genetic variation exists between varieties/breeds in a species and amongst individuals within breeds. This variation has developed over very long periods of time. A major ongoing challenge is how to best utilize this variation to meet short-term demands whilst also conserving it for longer-term possible use. Many animal breeding programs have led to increased performance for production traits but this has often been accompanied by reduced fitness. In addition, the global use of genetic resources prompts the question whether introduced genotypes are adapted to local production systems. Understanding the genetic nature of fitness and adaptation will enable us to better manage genetic resources allowing us to make efficient and sustainable decisions for the improvement or breeding of these resources. This book had an ambitious goal in bringing together a sample of the world’s leading scientists in animal breeding and evolutionary genetics to exchange knowledge to advance our understanding of these vital issues.
Book Synopsis Simulation of Genetic and Environmental Interaction of Three Tropical Hair Sheep Breeds for Meat Production by : Mohammad Hasan Rajab
Download or read book Simulation of Genetic and Environmental Interaction of Three Tropical Hair Sheep Breeds for Meat Production written by Mohammad Hasan Rajab and published by . This book was released on 1987 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Genotype-environment Interaction for Reproductive Traits in Ewes by : Howard Harold Meyer
Download or read book Genotype-environment Interaction for Reproductive Traits in Ewes written by Howard Harold Meyer and published by . This book was released on 1972 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Genotype X Environment Interactions in Animals by : S. N. Pani
Download or read book Genotype X Environment Interactions in Animals written by S. N. Pani and published by . This book was released on 1972 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Quantitative Genetics in Sheep Breeding by : Helen Newton Turner
Download or read book Quantitative Genetics in Sheep Breeding written by Helen Newton Turner and published by . This book was released on 1969 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Impact of Genetic X Environment Interactions on Performance of Katahdin Lambs Divergently Selected for Fecal Egg Count Estimated Breeding Value by : Nicole Kaitlyn Valliere
Download or read book Impact of Genetic X Environment Interactions on Performance of Katahdin Lambs Divergently Selected for Fecal Egg Count Estimated Breeding Value written by Nicole Kaitlyn Valliere and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Simulation of Genetic and Enviromental Interaction of Three Tropical Hair Sheep Breeds for Meat Production by : M. H. Rajab
Download or read book Simulation of Genetic and Enviromental Interaction of Three Tropical Hair Sheep Breeds for Meat Production written by M. H. Rajab and published by . This book was released on 1987 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of this study are: (1) to obtain estimates of genetical and environmental parameters for growth and reproduction characters of three tropical breeds of sheep Morada Nova, Brazilian Somali and Santa Ines; (2) to examine genotype by environmental interactions in order to optimally match these three genotypes with different environments by assessing the effect of different levels of nutrition on productivity of sheep in a semi-arid environment.
Book Synopsis An Investigation Into Genotype X Environmental Interaction in Mutton and Beef Producing Animals by : Frederick Wilhelm Cornelius Neser
Download or read book An Investigation Into Genotype X Environmental Interaction in Mutton and Beef Producing Animals written by Frederick Wilhelm Cornelius Neser and published by . This book was released on 1996 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Optimising UK Sheep Breeding Programmes by the Inclusion of Genotype X Environment (GxE) Interactions by : Ann McLaren
Download or read book Optimising UK Sheep Breeding Programmes by the Inclusion of Genotype X Environment (GxE) Interactions written by Ann McLaren and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
