ABSTRACT
Embryos collected from individual donors are generally all at a uniform stage of development, but occasionally one or more may be retarded, for example, two-cell embryos collected with eight-cell embryos. Substantial improvement in the survival rate of transferred embryos has been achieved, and procedures developed and adopted for use in sheep are basically those presently in use in both sheep and goats. Transfer procedures are similar for sheep and goats and they are basically those developed and illustrated by Hunter et al. Nonsurgical transfer has been attempted in the goat using very fine cannulae and cervical forceps. Hence, superovulation and transfer could prove a useful aid in preferential selection for the more fecund animals within populations. Serum gonadotropins, for example, Pregnant Mares Serum Gonadotropin and pituitary extracts of equine and ovine origin, will readily induce superovulation when given during the latter stage of the luteal phase of the estrous cycle.
