Year: 2015 | Month: August | Volume 5 | Issue 2
Estimates of Genetic Parameters and Trends of Lactation Performance Traits of Deoni Cattle
Abstract:
Data on 114 Deoni cows maintained at Cattle Cross Breeding Project, Vasantrao Naik Marathwada Agriculture University, Parbhani over a period of 25 years were used for the present investigation. The data were subjected to assess the effect of period of calving, season of calving, lactation order and age at first calving on persistency and lactation traits. The records corrected for significance and non-genetic factors were used for estimating genetic parameters of the milk production traits. Least squares means for persistency of milk yield in Deoni cattle by Mahadevan method was 2.98±0.20. The significant effect of period of calving was recorded on 305 DMY, LL, PY and DAPY and non-significant effect, was recorded on persistency of milk yield, lactation milk yield .The non-significant effect of season of calving & lactation order was recorded on persistency of milk yield & all milk production traits. The significant (P<0.05) effect of age at first calving was observed only on lactation length. It showed increasing trend from A1 to A3. Moderate to high estimates of heritability for all lactation traits were observed indicating improvement in these traits, which may probably be brought about by individual selection. Moderately high heritability was observed for persistency of milk yield (0.36 ± 0.23) and LL (0.25 ± 0.23).
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