References
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- Bonsma, F. N. (1939). Factors influencing the growth and development of lambs with special reference to cross breeding of Merino sheep for fat-lamb production in South Africa. University of Pretoria Publications, Pretoria.
- Owen, J. B. (1956). Agriculture, 62.
- Sugai, K., and Teramoto, K. (1958). Sci. Rep. Fac. Agric. No. 11, 61–67 (English summary in Animal Breeding Abstracts).