Published in Scientific Papers. Series D. Animal Science, Vol. LXIV, Issue 1
Written by Tsvetomira BANCHEVA, Svetoslava STOYCHEVA, Tsvetelina DIMITROVA, Nikolay MARKOV
In the temperate zone, sheep show an annual rhythm in their reproduction with alternating estrous and anestrous periods. In both seasons, biotechnical methods for intensification of the reproductive process include synchronization of estrous and ovulation through non-hormonal and hormonal methods and insemination. In sheep breeding practice, two methods of insemination are applied - natural and artificial insemination Factors influencing the efficiency of fertilization are: breed, age, season, feeding, physical condition of sheep and rams, method of synchronization, dose of gonadotropic preparation, method of insemination, time and frequency of insemination, use of fresh, chilled or frozen semen. In both methods of insemination, it is necessary to create good organization and control. The objective of the present review is to examine and summarize the factors influencing the result of the application of natural or artificial insemination of sheep.
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