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Asian Journal of Animal and Veterinary Advances

Year: 2007 | Volume: 2 | Issue: 1 | Page No.: 9-14
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Authors

Mahmudur Rahman

Rejoanoul Islam

Mohammad Mubinur Rahman

Mamunul Haque

Tanuza Das

Keywords

This study was aimed to access information on genetic parameters i.e., heritability and genetic correlations of some economic traits of dairy cattle available in Bangladesh. For that, data materials were collected from Central Cattle Breeding Station and Dairy Farm, Savar, Dhaka recorded during 1992 to 2005 on Indigenous called Local, Friesian x Local (50 F-50% L) and Jersey x Local (50 J-50% L) cattle covered birth weight, first lactation milk yield, first lactation length and first calving interval. REML estimated heritabilities (h2) of BW were 0.365, 0.495 and 0.489 in Local, Friesian x Local and Jersey x Local cattle, respectively. The same for FLL, FLMY and FCI were 0.486, 0.428 and 0.128 in Local; 0.495, 0.495 and 0.497 in Friesian x Local cattle and 0.496, 0.499 and 0.496 in Jersey x Local cattle. The overall estimates were 0.500, 0.497, 0.498 and 0.499, respectively for BW, FLL, FLMY and FCI. The mediums to high estimates for all the traits indicate that the traits studied were largely influenced by additive gene action. Genetic correlations (rG) of BW with FLL, FLMY and FCI were very low except medium rG between BW and FCI in Local cattle. The direction of genetic association was positive except negative rG were between BW and FLMY and BW and FCI in Local cattle. First lactation length was positively genetically correlated with FLMY and FCI in a medium to high magnitudes in all the studied genetic groups. Genetic correlations between FLMY and FCI were medium in Jersey x Local cattle but low in Local and Friesian x Local cattle. The overall estimate was also low. The magnitude of REML estimated (co) variance and genetic parameters obtained in the present study were within the published range of estimates. Therefore, these estimates may be used in selection and breeding programmes for dairy cattle development in Bangladesh.
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