The effect of the application of ICI 80996 in different phases of the oestral cycle on heat synchronization in heifers
With the objective of studying The efficiency of the synthetic prostaglandin analogue F2α ICI 80996 on heat synchronization, a study using 44 heifers was conducted. The synchronizing agent was applied by intramuscular injection at a dose of 0.5 mg/animal, in a system of two doses at an interval of eleven days. The heifers were divided into four groups of 11, where group A received the first dose on the second day of the cycle, B on the fourth, C on the eighth and D on the fourteenth day of the oestrus cycle. Following the application of the first dose, 0, 9.1, 100.0 and 100.0% of the animals of groups A, B, C and D respectively responded to treatment. The mean intervals between the application of the treatment and the start of heat were 64.4 and 72.6 hour respectively for groups C and D. Following application of the second dose, the total percentage of animals in heat was 93.2%, with a 100% response for groups A, C and 72.7% in group B. The mean interval between treatment and heat initiation for the four groups combined was 80.2 hours. Difference between groups was nonsignificant in relation to his interval and means were 80.9; 65.3; 87.3 and 83.3 hours respectively for groups A, B, C and D.
| Main Authors: | , , , , , |
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| Format: | Digital revista |
| Language: | por |
| Published: |
Pesquisa Agropecuaria Brasileira
2014
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| Online Access: | https://seer.sct.embrapa.br/index.php/pab/article/view/15709 |
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