AN S 226 Lecture Notes - Lecture 18: Corpus Luteum, Estrous Cycle, Tris
11 Apr 2019
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Effective only: 5 to 15 cycle (why?) Common brand names are lutalyse (upjohn ) and estrumate ( ) . Heat detection can start immediately after treatment to breed early those who were in da. Otherwise, wait about 5 days to heat detect will get 65 to 70% of normally cycling females. 1 shot: 5 days of breeding: 75% expected to show estrus in next 2 to 5 days. Means heat detect 5 days, then inject those who did not show heat. Then heat detect in 2 to 5 days. 2 shot: 11 days apart gives about 70 to 80 % response. Progestins: mga, oral application, 14 days application typical, uniform consumption necessary problem with use on new pastures, cows must be cycling, prolonged use can reduce fertility, common feedlot application . why: mga (melengestrol acetate by pharmacia-upjohn co. ) is a synthetic progesterone. As such, it is used to block estrus activity.
