[Influencing superovulation in cattle with serum gonadotropin antibody]

The effectiveness of GnRH (Luliberin) and goat anti-PMSG serum prepared at the Veterinary Research Institute, Brno, was studied during the superovulation of heifers treated with PMSG and Estrumate. The use of GnRH did not exert any positive influence on superovulation, as compared with the control groups,. when anti-PMSG serum was administered five hours from the determined beginning of oestrus (46-53 hours from the first administration of Estrumate), the length of oestrus was reduced in comparison with the control group (25.8 and 51.3 h), the number of 22.3). The tested heifers produced 17.8 ova, on an average, out of which (4.1 and 22.3). The tested heifers produced 17.8 ova, on an average, out of which 12.5 were good-quality embryos. The control heifers produced 6.9 ova including 2.9 embryos. The obtained results provide convincing evidence of the promising results of the use of goat anti-PMSG serum during the superovulation cattle.