Mohammed Endris Seid และ Sornthep Tumwasorn. (2012) Estimation of direct genetic effect of milk yield and lactation length and genotype by region interaction in dairy cows in Thailand. Kasetsart University:ม.ป.ท.Mohammed Endris Seid และ Sornthep Tumwasorn. 2012. Estimation of direct genetic effect of milk yield and lactation length and genotype by region interaction in dairy cows in Thailand. ม.ป.ท.:Kasetsart University;Mohammed Endris Seid และ Sornthep Tumwasorn. Estimation of direct genetic effect of milk yield and lactation length and genotype by region interaction in dairy cows in Thailand. ม.ป.ท.:Kasetsart University, 2012. Print.