Abstract

It has been demonstrated that the induction of multiple births in cattle can be accomplished by the injection of PMS (Gordon, Williams and Edwards, 1962; Turman, Renbarger and Stephens, 1968). These workers and others have reported that prenatal and postnatal mortality is less in twin than in higher multiple pregnancies and births. Therefore, the determination of a sequence of gonadotropin injections that will result in a high percentage of two ovulations is one of the requirements for developing a practical program for the induction of multiple births. In addition, the need to time the gonadotropin injections rather precisely during the estrous cycle (Casida et al., 1943; Willett, McShan and Meyer, 1952), plus a consideration of labor requirements suggest that such a program should also include estrous synchronization. The objective of this study was to determine a sequence of PMS and HCG injections, timed from either a natural or synchronized estrus, that would give a high percentage of two ovulations in beef cows and heifers.

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