Estrus Induction Rates and Conception Rates by MGA Feeding System in Hanwoo
2006
Lee, M.S. (National Livestock Research Institute, RDA, Suwon, Republic of Korea), E-mail: [email protected] | Jung, Y.H. (National Livestock Research Institute, RDA, Suwon, Republic of Korea) | Park, S.B. (National Livestock Research Institute, RDA, Suwon, Republic of Korea) | Im, S.K. (National Livestock Research Institute, RDA, Suwon, Republic of Korea) | Park, J.J. (National Livestock Research Institute, RDA, Suwon, Republic of Korea) | Jung, J.K. (National Livestock Research Institute, RDA, Suwon, Republic of Korea) | Moon, S.J. (Chonnam National University, Gwangju, Republic of Korea) | Kim, C.K. (Chung-Ang University, Seoul, Republic of Korea)
This study was conducted to investigate the effects of melengesterol acetate (MGA) and PGF∧2α administrations on serum progesterone level, synchrony of estrus and conception rates in Han-woo. Firstly, ten heifers and one freematin were fed 0.5 mg MGA/day for 14 days in a grain carrier, and after 19 days of MGA feeding, a single injection of 25 mg PGF∧2α were treated. Blood samples were collected to evaluate serum progesterone concentrations from the start of feeding of MGA until the end of feeding and subsequent estrous detection and artificial insemination (AI) at 3 days intervals, and on days of PGF∧2α injection, estrous detection, AI, and 15th and 60th days after AI.
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