1. Ackermann, J.J., 1993. Study of Dorper Sheep in the Dorper Land Area (in Afrikaans). M.Sc. Thesis, University of Stellenbosch, Stellenbosch, South Africa.
2. Effects of progestagen type and PMSG source on lambing outcomes in ewes following artificial insemination;Al-Kamali;Ir. Vet. J,1990
3. Effect of pregnant mare serum gonadotropin injection on litter size in young Etwah-cross goat does;Artiningsih;Jurnal-Ilmu-Ternak-dan-Veteriner,1996
4. Production and reproduction norms for Dorper sheep evaluated in two different areas (in Afrikanns);Badenhorst;Karoo. Agric,1991
5. Ovarian function in ewes during the transition from breeding season to anoestrus;Bartlewski;Anim. Reprod. Sci,1999