DOSE OF NORGESTOMET AND ITS EFFECT ON THE SECRETARY PATTERN OF HORMONES IN KANGEYAM COWS

Abstract

Twelve Kangeyam cows were synchronized with double injection of PGF2alpha at 11 days interval. At induced oestrus the cows were divided into groups as 1 and 2 consisting of six cows each. Group 1 and 2 were treated with one norgestomet and two norgestomet implants respectively. The day of implant insertion was considered as day 0 and the implants were kept in situ for 9 days. In both the groups 25 mg of PGF2alpha was administered on the day of implant insertion. The concentrations of progesterone, oestradiol and luteinizing hormones were assayed. During the treatment period the progesterone concentration did not show any significant difference between the groups. The luteinizing hormone registered an increasing trend in group-1 and such trend was not observed in group 2. The oestradiol concentration increased upto day 5 of the treatment period in both the groups and then it started to decrease in group 2 and consistently increased in group 1.