Lavinia Moise

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ANALYSE OF AVERAGE DURATION OF PREGNANCY AND OESTRUS IN SHEEP BREED MERINO PALAS AND TIGAIE

Lavinia Moise, Al. Şonea, V. Moise

Abstract
In this paper, the average duration of oestrus and pregnancy in Merinos of Palas and Ţigaie is analyzed to maximize reproductive function in these breeds. Application of a proper management, of planning and control methods of the sexual cycle, of conducting the rate of sexual life, of the fertility and prolificity can lead to high production parameters. The research was conducted in three different locations, in adult sheep and young sheep of Merinos of Palas breed, Ţigaie and half-breeds. Oestrus in sheep suddenly appears and gradually disappears after 24-36 hours of its appearance being accompanied by less obvious behavioral changes. In sheep with short oestrus, fertility and twinning are smaller, so it is recommended the separation of male and female sheep, avoiding the permanent contact of sheep with rams. Sheeps taken in study, average duration of oestrus was 24 hours (54.46% of adult sheep, respectively 64% of sheep young). From the analysis of the data obtained, shows that at adult sheeps, average duration of pregnancy is less than 148 days, and as regards the young sheep, average duration of pregnancy in all three units in the survey is with just over 148 days. Knowledge of gestation duration period allows the breeders the lambing planning and the creation of optimal conditions for lambing.

Key words: oestrus, pregnancy, sheep