Disclosed a process for making greater use of female gametes in herbivorous mannals. The techniques include methods of obtaining ova from donor, preparation of recipients, detection of oestrus, and transplant techniques. Also disclosed are methods of making greater desired use of ova of these mammals. Among those are techniques by sex determination, for freezing and thawing eggs, for tissue culture of eggs and for clonal production of like embroyos utilized for transplantation to achieve a greater number of clonal differentiated cellular bodies having like genetic characteristics.
