2011 Cilt 30 Sayı 1

Permanent URI for this collectionhttps://hdl.handle.net/11452/13940

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    Physiological mechanisms of multiple ovulations and factors affecting twin calving rates in cattle
    (Uludağ Üniversitesi, 2011-05-09) Çobanoğlu, Özden; Uludağ Üniversitesi/Veterinerlik Fakültesi.
    Reproduction in bovine is affected by several different factors. These factors explain some of the variations observed in the reproductive efficiency of animals. Several comprehensive studies were conducted to assess the incidence of twinning at birth in various dairy and beef cattle breeds. In this manner, many environmental and genetic factors affecting reproductive system have been studied quite extensively. Even if the natural incidence of multiple births in cattle is very low, some variations on the twinning rate can be observed due to the influence of breed differences, the effects of feeding and management systems and also the effects of some environmental sources such as a parity, an age of cow, a season of the year and a geographic location of raised animals. Thus, the main purpose of this review is to emphasize and explain the physiological mechanisms regulating multiple ovulations in cattle and also some of the important factors affecting multiple births positively or negatively on the cow production system.