Bindya Liz Abraham creator Sosamma Iype (Guide) text xx Mannuthy Centre for Advanced Studies in Animal Genetics and Breeding, College of Veterinary and Animal Sciences 2001 9999 monographic und

print

The present work is a study on the association between body weights, lactation milk yield and age at first calving in Vechur and other dwarf desi cattle maintained at Kerala Agricultural University. This information can be utilized in the selection programme to evolve a small cow weighing around 125kg and yielding 800 kg milk per lactation. The average body weights at birth, three, six, nine, twelve months and at adult stage for males of Vechur were 11.2 ± 0.2 kg, 28.7 ± 0.7 kg, 44.2 ± 0.8kg, 63.9 ± 4.0 kg, 76.1 ± 1.9 kg, 173.6 ± 6.9 kg and those for Kasargod, 11.1 ± 0.3 kg, 33.5 ± 3.0 kg, 49.5 ± 4.6 kg, 80.4 ± 6.8 kg, 86.8 ± 11.2 kg and 194?"3 ± 19.9 kg respectively. The corresponding estimates for females of Vechur were 10.2 ± 0.2 kg, 28.3 ± 0.7 kg, 43.3 ± 0.8 kg 52.7 ± 1.3 kg, 69.5 ± 1.2 kg and 138.5 ± 2.3 kg and those for Kasargod, 9.5 ± 0.4 kg, 29.1 ± 1.8 kg, 49.5 ± 2.7 kg, 54.3 ± 3.0 kg, 61.1 ± 3.8 kg and 147.7 ± 5.1 kg respectively. The average gain in weight for the four periods i.e., months 0-3, 3-6, 6-9 and 9 -6;12 when expressed as a percentage of initial weight for males of Vechur were 149.0, 54.7, 39.7, 25.3 and those for Kasargod, 198.4, 62.5, 59.5, 17.0 per cent respectively. The corresponding estimates for the females of Vechur were 178.1, 55,8, 31.8, 27.1 and those for Kasargod, 169.1, 58.4, 20.0, 13.3 per cent respectively. Male calves of Vechur gained 6.7 times and those of Kasargod 7.8 times the birth weight by twelve months of age. I Males and females differed in body weight only at adult stage. Between breeds, male calves at nine months and female calves at twelve months differed. The average age at first calving and lactation milk yield of Vechur were 1080.3 ± 33.6 and 579.6 ± 35.7 kg and those of Kasargod were 1147.5 ± 68.0 days and 298.3 ± 35.6 kg respectively. The means for milk yield differed significantly. Weight at three months had a heritability of 0.61 and adult body weight, 0.81 in Vechur. The heritability for milk yield and age at first calving were 0.1 and 0.06 respectively. Estimation of phenotypic correlations in Vechur revealed that birth weight had a correlation of 0.446 with twelve months weight. Body weights at the adjacent stages had correlations ranging from 0.36-0.77. Age at first calving had correlation only with weight at nine months (0.668) and milk yield had only with adult body weight (0.406), 11 In Kasargod, body weight at different stages upto 12 . months had correlations around 0.8 but not with adult body weight. Adult body weight and milk yield were found to have a correlation of 0.918. Genetic correlation In Vechur for weight at three months and adult weight was 0.683, but that between adult weight and milk yield was not significant. The annual genetic gain from selection was estimated to be -4.35 kg and 12.968 kg for adult body weight and lactation milk yield respectively. Considering a take off time of five years, it would be possible to achieve the target of 800 kg per lactation from the present 579.5 kg, in a time period of 22 years. Vechur is the smallest breed not only of India, but probably of the wor ld is the highest milk yielder among the very light breeds with the lowest age at first calving among all Indian breeds. Kasargod males have the highest growth rate upto one year among all Indian breeds. The potential of the Vechur cow for milk and the Kasargod bull calf for meat can be advantageously utilized at present and improved with selection in the future. MVSc 636.082 BIN/AS http://krishikosh.egranth.ac.in/handle/1/5810036527 http://krishikosh.egranth.ac.in/handle/1/5810036527 140128 20220830152840.0