Synchronization of Estrus in Sheep in Different Seasons

摘要

[Objectives] The aim was to improve and stabilize the estrus synchronization of local sheep in Xinjiang during the breeding season and non-breeding season. [Methods]The data of estrus rate and estrus concentration time were analyzed by different hormone treatment programs. [Results]eding season,whether PMSC was used did not affect the estrus of sheep when sponge and PG were used( P > 0. 05). Estrus was concentrated in 36-48 h after sponge plugs were removed,and the estrus rate in this period accounted for 74. 19% of the total. In non-breeding season,the estrus rate in the sponge plug plus PGF treatment was only56. 12%,significantly lower than that( 90. 43%) in the sponge plug plus PG plus PMSG treatment( P < 0. 01). The estrus was also concentrated in 36-48 h after sponge plugs were removed. The estrus rate at this stage was 67. 42%,accounting for 82. 8% of the total. In breeding season,the estrus rate in sheep injected with333 IU of PMSG( 81. 96%) was significantly lower than those of sheep injected with 500( 90. 25%) and 750 IU( 95. 3%)( P < 0. 05). [Conclusions] This study provides a theoretical basis for the production enterprises to save a lot of manpower and material resources.