M. . Endris, S. Tumwasorn, C. . Wongwan, P. . Sopannarath, and S. . . Prasanpanich, “Estimation of Direct Genetic Effects on Milk Yield and Lactation Length in the Aownoi Dairy Cooperative”, Agr. Nat. Resour., vol. 46, no. 4, pp. 546–553, Aug. 2012.