FROZEN SEMEN PRODUCTION UNDER SINGLE AND DOUBLE EJACULATION REGIMES FOR PUREBRED BULLS

The number of sperms harvested from any breeding sire will depend on the frequency of ejaculation (number of ejaculates collected weekly) and the amount of sexual preparation provided to the bull before permitting him to ejaculate. Sexual preparation of the bull is possible by permitting false mounts or by active restraining of the bull or a combination of false mounts and restraints prior to semen collection (Almquist, 1973; Almquist and Hale, 1956). The number of ejaculates per collection day and the number of collection days per week for a bull fall under the routine management decisions. The factors which are to be considered in this decision making process include the market demand for semen, the number of available breeding sires and the breeding soundness of the bulls.