1. Bykeni Z 1974. Some methods of evaluating the reproductive fitness of cocks. Byulleten Vsesoyuznogo Nauchno Issledovatel'skogo Instituta Razvedeniya I Genetiki Sel'skokhozyaistvennykh Zhivotnykh 1:30-34.
2. Choi KS Ohh BK Yeo JS 1980. Estimation of genetic variation in economic traits of broiler breeder stock. 1: Estimation of genetic variation in body weight of broiler breeder stock by means of diallel crosses. Korean Journal of Animal Science 22(6):453-460.
3. Gal'Pern I Dukhno Z 1974. Evaluation of hens and cocks for sexual behaviour and the use of this trait in breeding for increased fertility. XV Worlds Poultry Congress and Exposition New Orleans Proceedings and abstracts:259-261.
4. Gill HS Varma SK 1983. Genetic studies of growth in Columbian Plymouth Rock. Indian Journal of Animal Sciences 53(2):172-174.
5. Gonzalez E Berea G Perez M 1979. Inheritance of some traits in broilers. Memoria Asociacion Latinoamericana de Produccion Animal 14:135-136.