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Animal Reproduction Science
Folman, Y., Institute of Animal Science, The Volcani Center, A.R.O., Bet Dagan, Israel
McPhee, S.R., Animal Research Institute, Department of Agriculture, Werribee, Vic., Australia
Cummin, I.A., Animal Research Institute, Department of Agriculture, Werribee, Vic., Australia
To synchronize oestrus, a single dose of 0.5 mg of the prostaglandin F2α analogue cloprosterol (Estrumate) was administered to 200 post-partum beef and dairy cows. Six, 9 or 13 days following the injection of Estrumate a progesterone-releasing intravaginal device (PRID) was inserted for 12 to 16 days. Among the synchronization treatments investigated, the most promising one was to administer 0.5 mg of Estrumate followed 13 days later by a PRID inserted for 12 days. Following the use of this treatment 87% of post-partum suckling beef and dairy cows manifested oestrus within the first 3 days after PRID removal; 80% appeared in heat between approximately 36 and 72 h following PRID removal. Conception rates for untreated controls, cows inseminated once at 55 h, and cows inseminated twice at 48 and 72 h following PRID removal, were 52, 50 and 48% respectively. © 1981.
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The effect of "Estrumate" followed by progesterone coils on oestrus synchronization and conception of post-partum beef and dairy cows
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Folman, Y., Institute of Animal Science, The Volcani Center, A.R.O., Bet Dagan, Israel
McPhee, S.R., Animal Research Institute, Department of Agriculture, Werribee, Vic., Australia
Cummin, I.A., Animal Research Institute, Department of Agriculture, Werribee, Vic., Australia
The effect of "Estrumate" followed by progesterone coils on oestrus synchronization and conception of post-partum beef and dairy cows
To synchronize oestrus, a single dose of 0.5 mg of the prostaglandin F2α analogue cloprosterol (Estrumate) was administered to 200 post-partum beef and dairy cows. Six, 9 or 13 days following the injection of Estrumate a progesterone-releasing intravaginal device (PRID) was inserted for 12 to 16 days. Among the synchronization treatments investigated, the most promising one was to administer 0.5 mg of Estrumate followed 13 days later by a PRID inserted for 12 days. Following the use of this treatment 87% of post-partum suckling beef and dairy cows manifested oestrus within the first 3 days after PRID removal; 80% appeared in heat between approximately 36 and 72 h following PRID removal. Conception rates for untreated controls, cows inseminated once at 55 h, and cows inseminated twice at 48 and 72 h following PRID removal, were 52, 50 and 48% respectively. © 1981.
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