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Genetic Evaluation of F1, F2 and F3 Crosses of Hariana with Friesian, Brown Swiss and Jersy |
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Triveni Dutt, B. Bhushan, B. B. Srivastava, P. N. Bhat |
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| Abstract |
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Data on the first lactation performance traits of F1, F2 and F3 crosses covering the period from 1972 to 1995 of a total of 803 dairy cows of three genetic grades maintained at Livestock Production Research Farm, Indian Veterinary Research Institute, Izatnagar were analysed. Three genetic grades were 1/2 Friesian + 1/2 Hariana (FH), 1/2 Friesian + 1/4 Brown Swiss and 1/4 Hariana (FBH) and 1/2 Friesian + 1/4 Jersey + 1/4 Hariana(FJH). Age at first calving increased by 7% and 8% in F2 and F3, respectively, over the F1 in FH. The reduction in age at first calving at F2 and F3 levels by 2-7% over the F1 was observed in FBH and FJH. The lactation milk yield of F1, F2 and F3 crosses was 1,943 100.3, 2,202 120.5 and 1,925 123.2 kg in FH; 2,014 76.7, 2,264 91.5 and 2,096 123.9 kg in FBH and 2,005 87.0, 2,414 94.4 and 2,093 121.1 kg in FJH, respectively. The lactation milk yield improved by 12-20% in F2 crosses in various genetic grades. The performance of F1 was, however, maintained in FH F3 crosses, it improved by 4% in FBH and FJH F3 crosses. The lactation lengths and calving intervals were nearly the same for F1, F2 and F3 crosses in FH while lactation lengths and calving intervals were reduced by 3-11% in F2 and F3 crosses in FBH and FJH genetic grades. The milk yield/day of lactation length and milk yield/day of calving interval increased by 16-35% in F2 and 2-14% in F3 over the F1 in various genetic grades. It is recommended that a sufficiently large effective population size of these three genetic grades be maintained by inter se matings and rigorous selection of sires so for developing a genetic base population for new breed development. |
| Keywords:
First Lactation Traits; Crossbreds; Dairy Cow |
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