1. Performance of the Abernossa ranch in the production of Ethiopian Boran x Holstein crossbred dairy heifers in Ethiopia;Ababu D;Ethiop J Anim Prod,2006
2. Abebe G. 2008. Reproduction in sheep and goats. In: Alemu Yami, R.C. Merkel, editor. Sheep and goat production handbook for Ethiopia. p. 66–69.
3. Amhara Region Livestock Resources Development Agency (ARLSDA). 2005. Cattle genetic and health improvements and managements’ Training Manual. Bahir dar Ethiopia. 4-51p.
4. Andasa Livestock Research Centre (ALSRC). 2009. Development of open nucleus breeding scheme for Fogera cattle. Andasa Ethiopia.
5. Arthur GH. 2001. Arthur's veterinary reproduction and obstetrics. 8th ed.. London: Bailliere Tindall; p. 430–767.