Effect of season, parity and sex of calf on retention of placenta in cows and buffaloes

摘要

The reproductive pattern and breeding behaviour of cows and buffaloes vary due to changes in season and agro-climatic conditions of area (Saxena et al., 1983). The incidence of retained placenta (17.58-19.13 percent) has been recorded in the exoticcows (Narayanan et al., 2000). Its incidence varies due to gestation period and season. Therefore, the present investigation was undertaken to study the effect of season, parity and sex of calf on the retention of placenta in cows and buffaloes in the sub-Himalayan terrain of Uttaranchal State. Data were collected from the reproduction records of Livestock Research Centre of the University, regarding nature of calving (normal/abnormal), sex of calf, retention of placenta, parity, month and year of calving in cows and buffaloes during 1990-99. The crossbred cows and buffaloes which failed to expel their placenta within 24 hours of calving were considered to have retained their placenta as per farm practices. A total of 275 and 13 calvings in cows and buffaloes comprised the experimental material for this study. The incidence of retained placenta was studied upto 10th and 5th lactations in cows and buffaloes respectively depending upon the availability of data.