Comparison of using gonadotropin releasing hormone [Gn-RH] and/or manual rupture in treatment of ovarian cysts in dairy cows

ABSTRACT

This study was designed to evaluate the efficiency of the treatment with Gn-RH and /or manual rupture of the ovarian cysts. The work was carried out on 30 Friesian and Crossbred cows having postpartum ovarian cysts classified into four groups. Group I [6 cows] left without treatment and served as control, the cows in group II [8 cows] were treated i.m. with 20 ug Gn-RH [Receptal, Hoechst, AG], the cows in group III [6 cows were treated by manual rupture of the cyst and the group IV [10 cows] were treated i.m. with Gn-RH [20 ug] with a simultaneous crushing of the cysts. The animals were closely observed for estrus, and two or three months following treatment, the cows were reexamined for pregnancy diagnosis. Animals treated with Gn-RH together with crushing of ovarian cysts exhibited percentage of heat appearance [90%] within a period of 12.11 +/- 4.79 days following treatment and also 90% got pregnant. In cows treated only with Gn-RH, 87.5% came in heat after 17.18 +/- 6.08 days and 75% become pregnant. In cows treated by manual rupture of the cysts, 66.6% exhibited heat within 32.0 +/- 11.51 days and 50% conceived