SYNCHRONIZATION OF FERTILIZATION OF EWES USING RAM EFFECT | СИНХРОНИЗИРАНЕ НА ЗАПЛОЖДАНЕТО НА ОВЦЕТЕ ЧРЕЗ ЕФЕКТА НА КОЧА
2014
Nedelkov, K., Thrakia University, Stara Zagora (Bulgaria) | Todorov, N., Thrakia University, Stara Zagora (Bulgaria)
It is made an overview of the authors own experiments and published literature for the essence of factors which influence the ability to change the time for fertilization and synchronization of fertility of ewes by using the so called ram effect. Through the proper use of the ram effect it could be achieved synchronization of fertility of ewes with the result that within 10 to 13 days, at the beginning of the lambing period, it is possible to be lambed 40 to 50% of all ewes. Furthermore, this method allows adjusting the time of fertilization of ewes in order lambs for slaughter to be suitable for sale when their prices are most favorable or to achieve other economic benefits. Depending on the breed it is possible displacement of fertilization with 2 to 4 weeks. The response rate of ewes to the ram effect is not the same and it depends on the breed, feeding and respectively the body condition score, season, weather conditions, libido of teaser rams and other factors. Maiden ewes react weaker than adult ewes. The ram effect is greater when approaching a natural breeding season but it still occurs in the middle of breeding season. The ram effect is easy to use, inexpensive and environmentally safe method justifying its use in sheep breeding. The only disadvantage of the method is the need of more rams for natural insemination of many ewes for a short period. However, this is an advantage for artificial insemination.
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