Timed A.I. marks 20-year anniversary

摘要

Timed a .1. was first applied to dairy cows in Wisconsin more than two decades ago when ovsynch wasintroduced by Richard Pursley and Milo Wilt-bank. Its application has markedly changed how we manage reproduction not only in dairy cows but also in beef cows.Because of the options timed a.I. provides, and where heat detection is lacking, many herds can manage their a.I. breeding program quite well without heat detection. Let's look at the use of timed a.I. in the u.s. and some of the characteristics of herds applying estrus- and ovu-lation-synchronization and timed a.I. programs.