To study the effect of non-genetic factors on production and reproduction performance of Holdeo (Holstein Friesian × Deoni) straightbreds

Abstract

The present study was undertaken to evaluate the effect of non genetic factors on production and reproduction performance in Holdeo (HF × Deoni). It involves investigations of productive and reproductive characteristics viz., Lactation milk yield, Peak milk yield, Days to reach peak milk yield, Lactation period, Dry period, Service period, Gestation period and Inter calving period. The study included 20 years data (1976-1995) on total number of animals 223 Holdeo straightbred cows. The overall least squares means were recorded for LMY (1491.58  21.62 kg), PMY (7.12  0.02 kg), DRPMY (35.82  0.16 days), LP (288.58  2.14 days), DP (141.24  1.52days), SP (156.96  2.49 days), (273.77  0.06 days) and ICP (429.43  2.44 days). The LMY, PMY,LP, DP, SP, GP and ICP in Holdeo cow was not significantly affected by period of calving, season of calving and lactation order and dry period. The DRPMY was significantly affected by lactation order and dry period (P < 0.05) in Holdeo straightbred cows. However, period of calving and season of calving had non-significant effect on DRPMY. Overall least squares means of DP in Holdeo cow was 141.24  1.52 days. The effect of period of calving on GP was significant (P