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Factors affecting egg “quality” after superovulation in cattle
THERIOGENOLOGY
FACTORS AFFECTING EGG "QUALITY" AFTER SUPEROWLATION IN CATTLE M. P. BOLAND* , T. F. CROSBY AND I. GORDON Faculty of Agriculture University College Dublin, Ireland More than 200 beef heifers were superovulated to provide eggs for surgical and non-surgical transfers to recipients for twinning. Treatment with a standard regimen of pregnant mare's serum gonadotropin (PMSG) followed by human chorionic gonadotropin (HCG) applied on day 16 of the estrous cycle yielded an average of eight fertilized eggs per donor, but the incidence of egg abnormalities increased markedly when recovery wasmade more than 3 days after estrus. The viability of eggs recovered from superovulated cattle was tested by transfer to the rabbit oviduct. The PMSG-HCG treatment was also compared with a Prostaqlandin-PMSG regimen and superovulation was repeated in donor cattle to observe the incidence of abnormal eggs.
JANUARY
1978 VOL. 9 NO. 1
87
FACTORS AFFECTING EGG "QUALITY" AFTER SUPEROWLATION IN CATTLE M. P. BOLAND* , T. F. CROSBY AND I. GORDON Faculty of Agriculture University College Dublin, Ireland More than 200 beef heifers were superovulated to provide eggs for surgical and non-surgical transfers to recipients for twinning. Treatment with a standard regimen of pregnant mare's serum gonadotropin (PMSG) followed by human chorionic gonadotropin (HCG) applied on day 16 of the estrous cycle yielded an average of eight fertilized eggs per donor, but the incidence of egg abnormalities increased markedly when recovery wasmade more than 3 days after estrus. The viability of eggs recovered from superovulated cattle was tested by transfer to the rabbit oviduct. The PMSG-HCG treatment was also compared with a Prostaqlandin-PMSG regimen and superovulation was repeated in donor cattle to observe the incidence of abnormal eggs.
JANUARY
1978 VOL. 9 NO. 1
87