Estimation of Genetic Parameters for Kleiber Ratio and Trends for Weight at Birth and Weaning in Arabi Sheep
Journal Title: International journal of Advanced Biological and Biomedical Research - Year 2014, Vol 2, Issue 11
Abstract
Objective: Estimation of genetic parameters for Kleiber ratio (KR) and genetic trends for pre-weaning weights of Arabi sheep has not been previously conducted. Methods: Data and pedigree information were collected at the Khuzestan Ramin Agricultural and Natural Resources University, Animal Science Research Station, located in southwest Iran, from 2001 to 2008. (Co)variance components and corresponding genetic parameters were estimated using the restricted maximum likelihood procedure by excluding or including maternal genetic or maternal permanent environmental effects. Six animal models were fitted to optimise the model KR from birth to weaning, which is defined as the ratio of growth rate and metabolic rate and can be utilized as an indirect selection for feed conversion. Moreover, three-trait analyses were performed using the most appropriate models obtained in single-trait analyses on the basis of Akaike’s information criterion. Results: Direct heritability (h2d) estimate of 0.11 was obtained and maternal permanent environmental effects (pe2) contributed 10% of the total phenotypic variation for KR. Genetic trends for weight at birth and weaning were obtained by regression of average breeding values, on birth year. Direct genetic trends were positive and significant (p < 0.05) for weight at birth and weaning (6 and 24 g per year, respectively). Genetic correlations among traits ranged from -0.52 to 0.89 and phenotypic correlations from - 0.21 to 0. 0.71. Conclusions: Results showed the importance of inclusion of maternal permanent environmental effects in designing appropriate breeding programs to obtain accurate estimates of genetic parameters, and it is sounded that KR is a recommended option in selection program.
Authors and Affiliations
Hedayatollah Roshanfekr| Associate professor, Department of Animal Science, Faculty of Animal Science and Food Industries, Khuzestan Ramin Agricultural and Natural Resources University, Ahwaz, Iran
Keywords
Related Articles
- EP ID EP13410
- DOI -
- Views 378
- Downloads 12
COMPRESSION OF BREAST CANCER IMAGES BY PRINCIPAL COMPONENT ANALYSIS
The aim of this work, Early detection of the breast cancer and reduce the mortality rate. Breast cancer is the second most lethal cancer for women in the world today. Image compression is fundamental to the efficient a...
Effects of Inter and Intra Row Spacing on Growth, Yield and Yield Components of Roselle (Hibiscus Sabdariffa L.) at Wondo Genet, Southern Ethiopia
Objective: A field experiment was conducted to assess the optimum inter- and intra-row spacing on growth, yield and yield component of roselle (Hibiscus sabdariffa L.) in 2014/15 cropping season at wondo Genet Agricult...
Assessment of Serum Magnesium Level and Its relation with Atherosclerotic Carotid Intima Media Thickness in Post-Menopausal Women
Objective: A magnesium deficiency is known to be involved in many abnormalities in the post-menopausal women. Previous studies proposed that magnesium (Mg) might prevent atherosclerosis. In this study the efficacy of s...
Development of Entrepreneurship Ecosystem
Entrepreneurship in the world, especially in Western developed countries, the much interest in recent years the concept of entrepreneurial ecosystems and integrating the separation of infrastructure services needed by...
Studying some hydrodynamic properties of Iranian two local apples varieties related to harvest times (Ashegi and Gare Yapraq)
In order to design and manufacturing some postharvest equipment, determination of some hydrodynamic properties of crops are necessary. The quality of products in global and local markets can be increased by applying th...