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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.19.0651    [Accepted] Published online January 13, 2020.
Genetic parameters and Principal components analysis of breeding value for birth and weaning weight in Egyptian buffalo
Mohamed M. I. Salem1,*  , Amin Mohamed Said Amin2  , Ayman Fouad Abd Elhady Ashour2  , Mohamed Mohamed El-Said Ibrahim2  , Mohammed Kotb Abo-Ismail3 
1Department of Animal and Fish Production, Faculty of Agriculture, University of Alexandria, Alexandria, 21545, Egypt
2Animal Production Research Institute, Agricultural Research Center, Dooki, Giza, 12619, Egypt
3Animal science Department, College of Agriculture, Food and Environmental Sciences, California Polytechnic State University, San Luis Obispo, California 93407, USA
Correspondence:  Mohamed M. I. Salem, Tel: +203-5915427, Fax: +203-5922780, Email: mmisalem@gmail.com
Received: 15 August 2019   • Revised: 14 October 2019   • Accepted: 21 December 2019
Abstract
Objective
The objectives of the current study were to study the main environmental factors affecting birth weight (BW) and weaning weight (WW), estimate variance components, genetic parameters and genetic trend and to evaluate the variability and relationships among breeding value of BW and WW using principal components analysis (PCA).
Methods
A total of 16370 records were collected from 8271 buffalo calves. Genetic parameters and breeding values were estimated using a bivariate animal model which includes direct, maternal and permanent maternal effects. These estimates were standardized and used in PCA analysis.
Results
The direct heritability estimates were 0.06 and 0.41 for BW and WW, respectively whereas direct maternal heritability values were 0.03 and 0.14, respectively. Proportions of variance due to permanent environmental effects of dam were 0.455 and 0.280 for birth and weaning weight respectively. The genetic correlation between birth and weaning weights was weak approaching zero, but the maternal correlation was 0.26. The first two principal components (PC1 and PC2) were estimated utilizing the standardized breeding values according to Kaiser method. The total variance explained by the first two PCs was 71.17% in which 45.91% and 25.25% were explained by PC1 and PC2, respectively. The direct breeding values of BW were related to PC2 but those of WW and maternal breeding values of birth and weaning weights were associated with PC1.
Conclusion
The results of genetic parameters and PCA indicate that birth and weaning weights were not genetically correlated, and improving growth traits of Egyptian buffaloes could be achieved using WW without any adverse effect by BW.
Keywords: Genetic Analysis; Growth Traits; Multivariate Techniques


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