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Conference on Artificial Insemination

U. S. D. A.

Abstract

The third annual conference on artificial insemination was called to order by the chairman, Dr. L. M. Winters of Minnesota. In his introductory remarks Dr. Winters pointed out that the main objects of the conference were to make possible the exchange of ideas and findings of men working in the field, and to stimulate discussion. No formal papers had been included in the program in previous years, but a few were planned for this year to form a basis for discussion.

Dr. L. E. Casida of Wisconsin discussed a project designed to study fertility in dairy cattle. Three phases of the work were discussed, namely: (1) Interval from parturition to first succeeding oestrum; (2) Abnormalities at first heat following parturition; and (3) Experimental ovulation. The period from parturition to the first oestrum varied from 4 to 250 days. Ovarian changes associated with longer periods included quiescent ovaries, anovulatory follicles, corpus luteum atreticinn without heat, and ovulation without heat.