EFFICACY OF LAPAROSCOPICAL INTRAUTERIN INSEMINATION DEPENDING ON TIME OF SEMEN DEPOSITION IN THE UTERUS LUMEN AFTER ESTROUS SYNCHRONIZATION

M. Murawski, A. Kosiek

Artificial insemination is not widespread method in sheep reproduction because of low fertility of ram frozen-thawed semen. However laparoscopical intrauterine insemination give opportunity to get fertility similar to fertility of natural mated ewes. The aim of that study was to determine the most appropriate time of intrauterin insemination to obtain the highest fertility in the flock of ewes after estrous synchronization. Data were collected from two group consisted of 75 crossbreeds (Valaska x Lacone x Olkuska) ewes in each group. Estrous synchronization was carried out in the April (anoestrous) by Chrono-gest® method. Insemination was carried out in the first group between 54 to 56 hours and between 56 to 58 hours in the second group after sponges withdrawal. Ultrasound examination was performed 35 day after intrauterin insemination which shows that 80 % of ewes from the first and 93 % from the second group were pregnant. During lambing time from the first and the second group 77 and 92 % of ewes give birth to lambs respectively. Prolificacy of the first and second group were 156 and 160 % respectively and was significantly higher (p ? 0.05) from natural average prolificacy (134 %) for this flock. In this study was showed that the most proper time for intrauterine insemination of ewes crossbreeds was fertility window between 56 to 58 hours after sponges withdrawal which resulted in 92 % of synchronized ewes lambed.

Download full text in PDF format