Study On Adaptability Of Small Fat-tail Sheep In Southern China

Germplasm Characteristics, wool quality, fattening and reproductive performancewere tested for the study of adaptability of small fat-tail sheep in the south area, and semencryopreservation effect and parasite infection were discussed. Compared with small fat-tailsheep of origin, the ability to adapt to the situation of south area was evaluated in order tofind out the adaptation of small fat-tail sheep in the south region and work out thecorresponding strategies and solutions. It has a positive significance for improving thescientific nature of small fat-tail sheep breeding and extension in the southern region.1Germplasm characteristics determination of small fat-tail sheep of south regionThe variation of body temperature and heart rate was within the normal physiologicalrange. The lambing rate was236.8%, litter weight at birth weight was7.27±1.95kg. Theweight of3months of male and female lamb was18.53±3.05kg and17.38±2.79kg,respectively. Further, body weight of yearling ewe was37.50±3.42kg, which all reachedstock germ-plasm requirements.2Wool quality determination of small fat-tail sheep in southern areaIn the hot and humid conditions of the southern region, wool quality of small fat-tailsheep was descending, wool production decreased seriously.3Study on fattening performance of small fat-tail sheepLambs at2-3months age were fattened for60d with rice and detoxicated rapeseedcakes diet, daily gain was150.8±24.5g, slaughter rate was46.35%, which were lowerthan control group that was fed with rice and soybean meal diet, but the difference was notsignificant. Slaughtering rate of stabling small fat-tail sheep of south region was about45.6%, net meat rate was around33.8%, which was significantly higher than the slaughterperformance of grazing conditions.4Effect of different cultivation methods on small fat-tail sheep breeding performanceThe reproductive performance of small fat-tail sheep bred in the condition ofconfinedness was better than that bred in the condition of grazing.5Study on semen cryopreservation effect of small fat-tail sheepThree extender used in Small fat-tail sheep，stored for72h at4℃, the sperm motilitywas43%, the percent abnormal sperm count was20.7%, normal acrosome count was36.3%with the types2.Three kinds of diluents were used in small fat-tail sheep semen cryopreservation, Aftersaved for72h with formula2at4℃, semen average activity, sperm average malformationrate and acrosome integrity rate were43%,20.7%,36.3%,respectively.6Parasitic infection of small fat-tail sheepSmall fat-tail sheep bred in southern area had a higher roundworm infection rateamong all kinds of internal parasites.In a word, Small fat-tail sheep showed a strong adaptability to the culture environmentof southern area.