Management of postpartum anoestrus in Vechur cows by hormonal methods

The study aimed to evaluate suitable hormonal treatment regimen for inducing oestrus in postpartum anoestrus Vechur cows and its reproductive outcome. The efficiency of Ovsynch and Ovsynch + progesterone protocols in 12 anoestrus cows was studied. Six anoestrus cows were kept as untreated control and they were observed for a period of 180 days postpartum. Both treatment protocols resulted in a complete oestrus induction response of 100 per cent. The interval from treatment to induced oestrus was significantly lower in the Ovsynch group (50.10 ± 1.44 h) than in the Ovsynch + progesterone (54.40 ± 0.48 h) group. In comparison to the control group, treatment group animals displayed a high intensity score for oestrus. The duration of oestrus in the Ovsynch group (26.41 ± 0.53 h) was significantly longer than the control (24.45 ± 0.46 h) group and the Ovsynch + progesterone group (24.13 ± 0.42 h). The overall conception rate for three consecutive AI in Ovsynch, Ovsynch + progesterone and control group were 66.67, 83.33 and 33.33 per cent, respectively. The calving to conception intervals were significantly (p<0.001) shorter in Ovsynch (118.33 ± 9.71 d) and Ovsynch + progesterone (106.67 ± 8.12 d) groups than the control (191.5 ± 5.36 d). It is concluded that hormonal treatment is effective in inducing postpartum oestrus and reducing the calving to conception interval in Vechur cows. Keywords: Ovsynch, postpartum anoestrus, progesterone, Vechur