Effect of vitamins A, E and selenium and progestagen-PMSG on reproductive performance in Kivircik sheep

Koyuncu M., Uzun S., Ozis Ş., Yerlikaya H.

INDIAN VETERINARY JOURNAL, vol.82, no.6, pp.630-633, 2005 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 82 Issue: 6
  • Publication Date: 2005
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.630-633
  • Bursa Uludag University Affiliated: Yes


Little is known about the effects of vitamin E and A supplementation on specific reproductive events in sheep. Two pharmacological agents are frequently used to synchronize estrus in small ruminants during the breeding season: luteolytic drugs (Thimonier, 1981) and progesterone or its analog progestagen (Gordon, 1975). The progestagen most widely used commercially via intravaginal sponges are medroxyprogesterone acetate and fluorgestone acetate. Although some experiments have found these two progestagens equally effective in estrus, ovulation and fertility (Gordon, loc. cit.; Smith et al., 1981). Others have favoured fluorgestone (Boland et al., 1978; Alifakiotis et al., 1982). Though Turkey sheep breeds show estrus cyclicity round the year, the majority of ewes exhibit estrus activity during the autumn and the overall productivity remains low due to their poor reproductive ability. The objective of this study was to investigate the reproductive efficiency in the native breed adopted in this region.