Estrus Control In Sheep Ewesof Industrialized

In this paper,the exogenous hormone was injected into different sheep breeds under factorization raising condition ,which were fed in different ecological environment,feeding conditions seasons,to realize synchronization of estrus.Estrus ewes were treated with artificial insemination in the right time.Estrus time,transport time,second insemination time in estrus return,lambing time and litter size were record in detail. The fecundity ewes in the offspring were the supplement of the ewe group.This study used estrus control and artificial insemination together or embryo transplantation .Try to find a good method of feed sheep industrialized.Experiment 1:This study used sheep ewes estrus control and embryo transplantation together .we found the result is not magnificent in 4 times. From 0 to 24 hours,the synchronize estrus rate is 13.27% ,from 48 to 72 hours, the synchronize estrus rate is 10.94 % there was no significant difference(p> 0.05), but from 24 to 48 hours, the synchronize estrus rate is 50.75 %,which is significant different from the two above . In the first three times'frozen embryo transplanting, the difference of the pregnancy rate was not significantly (P>0.05) (66.67%, 65.52%, 65.54%). The fresh embrionic transplant's rate of pregnancy (83.3%) is higher than the frozen embrionic transplant obviously(P<0.05).The rate of the ewe which can be used to transplant under Stalls-feed condition (92.06%)is obviously higher than what under herds condition (87.19%)(P<0.05).Experiment 2:This study used sheep ewes estrus control in different sheep breeds which were fed in different ecological environment,feeding conditions seasons,the result is it's no significantly of estrus synchronization rate in different time. It's lower the non-breeding season than the same period in estrus the breeding season. The reason maybe due to early production caused by the sheep. In different places, different varieties, different feeding conditions on the first estrus control of the situation did not affect the rate of estrus significant difference, and raising the conditions of the lambing rate significantly (P< 0.05), keeping the lambing shed was significantly higher Keeping in grazing (P <0.05). Sheep and the beginning of production of sheep production control Comparison of estrus was significantly lower than the production ewes (P <0.05).Experiments 3:This experiment take the non-reproduction and the reproduction season ram reproductive health as the essential target, after sexual desire inspection, experiments is divided three kinds, namely: 1) Both the sexual desire and the seminal fluid quality are normal;2) The sexual desire is normal, but the seminal fluid quality is low .3) The seminal fluid quality is normal, but sexual desire low . To the seminal fluid quality low ram, use the low dose testosterone + PMSG short-term processing plan. To the non-sexual desire's ram, uses the low dose testosterone + HCG short-term processing plan. The test result indicated that after low dose testosterone + PMSG processing in 10-30d ,the seminal fluid quality restores normally, the effectiveness achieves 90-100% (P<0.01) ,And with the low dose testosterone + HCG processing, the normal sexual desire of the ram can restore in 12-25d,the effectiveness achieves 90-100%(P<0.01).