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Paper Information

Journal:   SCIENTIFIC-RESEARCH IRANIAN VETERINARY JOURNAL   WINTER 2008 , Volume 3 , Number 4 (17); Page(s) 73 To 80.
 
Paper: 

EVALUATION OF THE GENETIC AND PHENOTYPIC POTENTIAL OF PRODUCTIVE TRAITS IN NAJDI DAIRY CATTLE USING UNI AND MULTIPLE TRAITS MODEL

 
 
Author(s):  NAZARI M., BEIGI NASSIRI M.T., FAIAZI J.
 
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Abstract: 

In this study 15600 records of milk and fat yield and fat percentage which were collected during 1988-2004 were used to estimate genetic parameters. The data were obtained by Animal Breeding Station of Najdi Cattle located in Shooshtar. (Co) Variance components were estimated using uni and multiple traits animal model with Restricted Maximum Likelihood method. Mean and Standard deviation for milk yield, fat yield and fat percentage were: 706.68±19.68, 30.10±2.96 and 4.26±0.05 respectively. In this model, the effect of the month and calving season, lactation period, milking type on all traits was significant. Calving interval was covariable. Heritability of milk yield, fat yield and fat percentage were: 0.29±0.05, 0.1±0.01 and 0.15±0.02 respectively using univariate model. Genetic and phenotypic correlation between milk yield-fat percentage, milk yield-fat yield, fat yield-fat percentage were: -0.39 and -0.04, 0.83 and 0.3, 0.7 and 0.32 respectively. Heritability for milk yield trait was moderate. So, selection on the basis of this trait may cause desirable genetic gain.

 
Keyword(s): HERITABILITY, MILK AND FAT YIELD, NAJDI CATTLE, CALVING SEASEN, KHOUZESTAN, ANIMAL MODEL, UNI AND MULTIPLE TRAITS
 
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