Atkins, K. D. 1980. Non-genetic factors affecting body weight in sheep. Australian Journal of Experimental Agriculture and Animal Husbandry 20:272-279
Buitendag, G. 1986. Commercial Agriculture in Zimbabwe 1986/7. Annual Report (Ed. M. Van Hoffen) Mardon Printers, Harare. Zimbabwe
Buvanendran, V., S. M. Makuza and P. Chironga. 1992. Phenotypic and genetic parameters of weaning traits in Dorper sheep in Zimbabwe. Small Ruminant Res. 7:369-374
Central Statistical Office (CSO) 1999. Agriculture and Livestock Survey in Communal Lands. Central Statistical Office, Causeway, Harare, Zimbabwe
Chang, T. S. and A. L. Rae. 1972. The genetic basis of growth, reproduction and maternal environment in Romney ewes. II Genetic co variation between hogget characters, fertility and environment of the ewe. Aust. J. Agric. Res. 23:149-165
Cloete, S. W. P., G. J. Delport, G. J. Erasmus, J. J. Olivier, H. J. Heydenrych and Elizabeth du Toit. 1992. Environmental and genetic trends in clean fleece mass, live mass and fibre diameter in selection experiment for increased clean fleece mass in South Africa Merino sheep. S. Afr. J. Anim. Sci. 22:50-57
Dickerson, G. E. 1978. Animal size and efficiency: Basic Concepts. Animal Prod. 27:36
Dingwall, W. S., J. J. Robinson and C. Fraser. 1981. Foetal growth during early pregnancy in prolific ewes. Anim. Prod. 32:364 (Abstr)
Donald, H. P. and W. S. Russel 1970. The relationship between liveweight of ewe at mating and weight of newborn lamb. Anim. Prod. 12:273-280
Donkin, D. J. 1973. Sheep breeds in Rhodesia. In: Sheep Handbook. Sheep Producers Association, Harare, Zimbabwe. pp. 2.1-8
Galal, E. S. E., E. A. Aboul-Naga, E. A. Elatawil and E. S. Kishin. 1972. Estimates of Combining Abilities and Maternal Influence in Crosses between Merino, Ossimi and Barkie Sheep. Anim. Prod. 15:47-52
Hulet, C. V., W. C. Foote and D. A. Price. 1969. Factors affecting growth of ovine fetuses during early gestation. Anim. Prod. 11:219-223
Kennan, T. C. D. 1979. Rhodesia Agricultural Journal 76:53-63.
Khan, B. U. and K. L. Sohani. 1983. Preweaning body weights and linear body measurements in Jamunapari goats under semi- arid farm conditions. Ind. J. Anim. Sci. 53:835-840.
Khombe, C. T. 1985. Environmental Factors affecting the growth and viability of crossbred sheep and goats on range in Zimbabwe. In: Small Ruminants in African Agriculture. (Ed. R. T. Wilson and D. Bourzat). International Livestock Centre for Africa (ILCA), Addis Ababa, Ethiopia pp. 46-52.
Mangus, W. L. and J. S. Brink. 1971. Relationship between direct and maternal effect on growth in Herefords. I. Environmental factors during preweaning growth. J. Anim. Sci. 32:17-25.
Manyuchi, B., H. P. R. Tawonezvi and R. M. Chiwara. 1990. Breed and environmental Influences on weaner lamb production in Zimbabwe Tropical Animal Health and Production 22:35-38.
Matika, O. 1995. Sheep in a Semi-Arid Environment in Zimbabwe: Performance levels and genetic parameters. Matopos Research Station, Bulawayo, Zimbabwe (unpublished).
Meyer, K. 1988. Restricted Maximum Likelihood to estimate variance components for animal models with several random effects using a derivative-free algorithm, Selection, Evolution (23).
Mukandan, G. and T. G. Rajagopalan. 1971. An evaluation of dam on the frequency of multiple births in Malabari goats. Kerala. J. of Veterinary Sci. 2(2):95-98 (ABA 47, 4894).
Olson, W. L., G. E. Dickerson and H. A. Glimp. 1976. Selection criteria for intensive market lamb production: Growth traits. J. Anim. Sci. 43:78-89.
Olivier, J. J., G. J. Delport, G. J. Erasmus and T. J. Eksteen. 1987. Linear type scoring in Merino sheep. Karoo Agric 3(9):1.
SAS. 1996. SAS Guide for Personal computers, version 6.12. SAS inst., Inc., Cary, NC. USA.
Shrestha, J. N. B., W. E. Rempel and W. J. Boyan. 1974. Evalution of purebred ewe and lamb productivity. J. Anim. Sci. 39:966 (Abstr).
Trail, J. C. and G. D. Sacker. 1966. Production records of lambs from East Africa Blackheaded ewes and Dorset Horn rams. East African Agricultural and Forestry Journal.
Van Wyk, J. B., G. J. Erasmus and K. V. Konstantinov. 1992. Nongenetic factors influencing early growth traits in the Elsenburg Dormer sheep stud. S. Afric. J. Anim. 23:67-70.
Wilson, R. T. 1986. Livestock production in Central Mali: Long term studies on cattle and small ruminants in the agropastoral system Research Report 14. ILCA, Addis Ababa, Ethiopia.