Effects of Different Progesterone Plugs on Estrous Control in Ewe

In breeding season and non-breeding season, the effects of three kinds of progesterone plugs on estrous control in ewes were studied. Meanwhile, the advantages and the disadvantages of the progesterone plugs were analyzed. The results showed that there were no significant difference among three progesterone plugs on modulating the ewes' estrus and pregnancy, and affecting estrous rate and fecundation rate (P>0.05). It was observed that the progesterone plug produced by Animal Husbandry Research Center of Heilongjiang Academy of Agricultural Sciences could modulate the ewes' estrus and pregnancy effectively, and the low cost and convenience in operation made it popularize in the reproducation of sheep widely.