2[2]Thompson J R,Freeman A E,Nilson D J,et al.Evaluation of a linear type program in Holstein[J].Journal Dairy Science,1981,(64):1610-1617.
3[3]Thompson J R,Lee K L,Freeman A E,et al.Evaluation of a linearized type appraisal system for Holstein cattle[J].Journal Dairy Science,1983,(66):325-331.
4[4]Brotherstone S,McManus C M,Hill W G.Estimation of genetic parameters for linear and miscellaneous type traits in Holstein Friesian dairy cattle[J].Livestock Production Science,1990,(26):177-192.
5[5]Diers H,Swalve H.Estimation of genetic parameters and breeding value for linear scored type traits[J].World Review of Animal Production,1990,(4):67-70.
