Research On Definitiion Of Breeding Goal And Optimization Of Breeding Program For Sanhe Cattle

Based on the production and breeding situation of Inner Mongolia Sanhe cattle, Bio-economic model was employed to estimate the economic values of traits in breeding goal. With selection index and gene flow methods, the ZPLAN software was used to analyze the breeding efficiency of current breeding program, and optimized the various factors affecting the breeding program in Sanhe cattle. Also, we compared the breeding profit and economic evaluation of progeny test breeding, young bull breeding and genome selection breeding. The conclusions in this study were as follows:1. Bio-economic model was constructed to evaluate the economic values of each objective trait. Under milk composition (fat percentage, protein percentage,somatic cell count) pricing, economic value for each objective trait was:RMB2.26(Milk Yield,kg),40.48(Fat Percentage,%),61.39(Protein Percentage,%),-231.52(Somatic Cell Count),6.19(Birth Weight, Kg),1.39(Daily Gain for fattening Cattle, g/day),76.70(Dressing Percentage,%),0.25(Productive Lifetime, day),-1.62(Age at First Calving, day),-2.71(Calving Interval, day), respectively. Sensitivity analysis indicated that the prices of the milk and beef were positive to economic value, while the price of feed was negative to economic value.2. The relative economic weight of dairy, beef, functional traits was62:15:23, similar to3:1:1.3. Set the planning period for20years, the breeding profit of implement breeding program was RMB620.3/cow/year, the genetic progress of the implement breeding program is RMB151.28/cow/year. The optimization analysis of the progeny test breeding program in Sanhe cattle indicated:based on the total herd size of base cow population of50000,the proportion of breeding groups was30%,the proportion of post-test cow was60%in breeding group, the number of test bull was15, the production life of seed bulls and seed cows were2years, the production life of test-bulls and proven bulls were1year, the production life of the mother of cow in the breeding group was3years, the breeding program was optimal.4. The breeding program of young bull and genomic selection(GS) were compared to the progeny testing breeding program. The results showed that breeding profit of the progeny test program was the lowest, the investment of breeding and the generation interval of which were bigger than young bull breeding program, but higher in genetic progress comparing it. Genomic selection(GS)was superior to progeny testing and young bull program in the generation interval, genetic progress and breeding profit. Nevertheless, with current production and breeding conditions and long-term breeding strategies of Sanhe cattle in Inner Mongolia Hailar district, genomic selection(GS) breeding program has certain difficulty in breeding practice, Hence, progeny test program is firstly needed to consider at present.