Effects of Age and Gonadotropin Treatment on Superovulation in the Calf

Publisher Website
Google Scholar
Abstract
Souperovulation of the calf has been reviewed by Onuma, Hahn and Foote (1970). Mean superovulatory response often has been adequate, but variability always has been extreme. Only a small percentage of the ovulation points has resulted in recovered ova, and cleaved ova have been rare until recently (Onuma et al., 1970). The aim of our work was to find improved methods of obtaining viable fertilized ova from calves of several ages by varying gonadotropin treatments and the time of ova recovery. Holstein calves, several days of age, were purchased locally and with the exception of one group were housed individually and fed a standard diet (Onuma et al., 1970). The usual sequence of treatments started with an intramuscular (i.m.) injection of pregnant mares' serum gonadotropin (PMSG) followed in 5 days by pituitary luteinizing hormone (LH) given intravenously (i.v.). Ova usually were recovered 3 or 5 days later. Specific designs, including age of the calves used, are described for each experiment along with the results. Copyright © 1971. American Society of Animal Science . Copyright 1971 by American Society of Animal Science.

This publication has 0 references indexed in Scilit: