Abstract
Data pertained to 335 crossbred cows comprising of 1/2 Friesian (F) + 1/2 Hariana (H), 1/2 F + 1/4 Jersey (J) + 1/4 H, 1/2 F + 1/4 Brown Swiss (BS) + 1/4 H, 1/2 F + 1/4 Red Dane (R) + 1/4 H, FR (I) and FRH (I) genetic groups extending over a period of 21 years (1970-1990) maintained at Animal Farm of CCS HAU, Hisar. The averages for first lactation milk yield was 2,486.24±80.26 kg and peak yield of first three lactation were 11.35±0.72 kg, 13.97±0.60 kg and 16.02±0.42 kg, respectively. The lifetime milk production was observed as 11,305.16±1,004.52 kg in crossbred cattle. The average first lactation fat yield was observed as 102.06±0.01 kg and peak fat yield of first three lactation were 0.458±0.01, 0.490±0.01 and 0.500±0.02 kg, respectively. The lifetime fat production was estimated as 502.31±45.90 kg. LTMP and LTFP had reasonably good additive genetic variance which could be exploited either through mass selection/combined with family or pedigree selection. FLMY, peak yields and LTMP had significant positive phenotypic correlation with FLFY and LTFP and the correlation at the genetic level were also higher and positive for these traits. Finally, peak week milk yield of first lactation (PMY1) was the earliest available trait having desirable and significant correlation at phenotypic and positive at genetic level with FLFY, PFY1 and PFY2, PFY3 and LTFP and selection for this trait will help in early evaluation of sires and dams and will increase genetic advancement per unit of time. (Asian-Aust. J. Anim. Sci. 2003. Vol 16, No. 9 : 1242-1246)
Highlights
The first lactation milk and fat yield reflects the real economic worth of the cow and is considered as a selection criterion for the improvement of genetic potential of dairy animals by using different progeny testing programme in which superior germplasm can be identified on the basis of performance of their progeny under farm and field condition
Data pertained to 335 crossbred cows comprising of 1/2 Friesian (F) + 1/2 Hariana (H), 1/2 F + 1/4 Jersey (J) + 1/4 H, 1/2 F + 1/4 Brown Swiss (BS) + 1/4 H, 1/2 F + 1/4 Red Dane (R) + 1/4 H, FR (I) and FRH (I) genetic groups extending over a period of 21 years (1970-1990) maintained at Animal Farm of CCS HAU, Hisar
Vander Welf and De Boar (1989a) proposed a mixed model for analysis of such data in which care has been taken for fixed effects of heterosis and recombination for the estimates of variance components from crossbred population
Summary
The first lactation milk and fat yield reflects the real economic worth of the cow and is considered as a selection criterion for the improvement of genetic potential of dairy animals by using different progeny testing programme in which superior germplasm can be identified on the basis of performance of their progeny under farm and field condition. Vander Welf and De Boar (1989a) proposed a mixed model for analysis of such data in which care has been taken for fixed effects of heterosis and recombination for the estimates of variance components from crossbred population They used parent group model and found that estimates of additive variance were. In the present study it was not possible to include the effect of heterosis and recombination in the model due to lack of proper data structure/records, parent group model was used to utilize the available records Keeping this in view the above facts and to plan a sound-breeding programme for further propagation of these crossbred animals having different levels of exotic inheritance, it is essential to know the extent of genetic variability and co-variability among different milk and fat production traits
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