Analysis Of Breeding Effect Of Chinese Simmental Using Open Nucleus Breeding System

Datacontalning l8495 records of 7928 bomals) of ChineseSinunental were collected from 7 livestock breeding bos at nationallevel to evalwte the breeding effect of Chinse Shaental over 20years. Besides evalwting the genetic paramaters, we also evaluate thePBV(Predicted Breeding Value) of the four main traitS and analysistheir trends. Inbreeding coefficients were also analyZed in this studyThe traits anaiyzed were 305-day milk yteld, ndlk fat percentage, milkprotein percentage, body weigh at l8 months, chly gain at l8 monthsand score of body tyPe. Their heritabilities are 0.35, 0.2, 0.2l, 0.3l,0.29 and 0. 18 resPectively The mean PBV of 305-day Inilk yield keptgoing uP, ndlk fat percentage has no obvious fluchation, body weighand body tyPe score Presellted a going down trCnd.The resultS indicate that. it can cofibol the coefficient of inbreedingeffechvely using ONBS and a lot of propess have been made onChinse Striental ndlk yield trait, and tha, the ndlk fat percentage isabout 3.7%. More attention should be paid to body weight of ChineseSinunental, improving the meat performance as well as ndth yteldperformance in the fufor.