(Co)Variance components and genetic parameter estimates for growth traits in Moghani sheep |
| |
| Institution: | 1. Department of Animal Science, Faculty of Agriculture, University of Guilan, Rasht, Iran;2. Department of Animal Science, Faculty of Agriculture, University of Kurdistan, Sanandaj, Iran;3. Department of Animal Science, Jiroft Faculty of Agriculture, Shahid Bahonar University of Kerman, Jiroft, Iran;1. Department of Animal Science, College of Agriculture, Shahid Bahonar University of Kerman, P.O. Box 76169-133, Kerman, Iran;2. Department of Animal and Poultry Science, College of Aburaihan, University of Tehran, P.O. Box 465, Pakdasht, Iran;1. Division of Animal Genetics and Breeding, Faculty of Veterinary Sciences & Animal Husbandry, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, Shuhama, Alusteng, Srinagar, J&K, 190006, India;2. Department of Sheep Husbandry Kashmir, Jammu and Kashmir, India;1. Department of Animal Sciences, Stellenbosch University, Private Bag X1, Matieland, 7602, South Africa;2. Directorate: Animal Sciences, Department of Agriculture, Western Cape Government, Private Bag X1, Elsenburg, 7607, South Africa;3. Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation (QAAFI), The University of Queensland, Health and Food Sciences Precinct, 39 Kessels Road, Coopers Plains 4108, Australia;1. Sustainable Intensification and Resilient Production Systems (SIRPS) Program, International Center for Agricultural Research in the Dry Areas (ICARDA), c/o ILRI 5689 Addis Ababa, Ethiopia;2. Sustainable Intensification and Resilient Production Systems (SIRPS) program, International Center for Agricultural Research in the Dry Areas (ICARDA), P.O. Box 950764, Amman 11195, Jordan;3. Embrapa Caprinos e Ovinos, Caixa Postal 71, CEP 62010-970 Sobral/CE, Brazil;1. Department of Animal Science, Science and Research Branch, Islamic Azad University, Tehran, Iran;2. Department of Animal Science, Shahr-e-Qods Branch, Islamic Azad University, Tehran, Iran;3. Department of Animal Science, Faculty of Agriculture, University of Kurdistan, Sanandaj, Iran |
| |
| Abstract: | Genetic parameters were estimated for birth weight (BW), weaning weight (WW), yearling weight (YW), average daily gain from birth to weaning (ADG1) and average daily gain from weaning to yearling (ADG2) in Moghani sheep. Maximum number of data was 4237 at birth, but only 1389 records at yearling were investigated. The data was collected from 1995 to 2007 at the Breeding Station of Moghani sheep in Jafarabad, Moghan, Iran. (Co)Variance components and genetic parameters were estimated with different models which including direct effects, with and without maternal additive genetic effects as well as maternal permanent environmental effects using restricted maximum likelihood (REML) method. The most appropriate model for each trait was determined based on likelihood ratio tests and Akaike's Information Criterion (AIC). Maternal effects were important only for pre-weaning traits. Direct heritability estimates for BW, ADG1, WW, ADG2 and YW were 0.07, 0.08, 0.09, 0.09 and 0.17, respectively. Fractions of variance due to maternal permanent environmental effects on phenotypic variance were 0.08 for ADG1. Maternal heritability estimates for BW and WW were 0.18 and 0.06, respectively. Multivariate analysis was performed using the most appropriate models obtained in univariate analysis. Direct genetic correlations among studied traits were positive and ranged from 0.37 for BW–ADG2 to 0.85 for ADG1–YW. Maternal genetic correlation estimate between BW and WW was 0.33. Phenotypic and environmental correlation estimates were generally lower than those of genetic correlation. Low direct heritability estimates imply that mass selection for these traits results in slow genetic gain. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
