1. Addisu B, Mengistie T, Adebabay K, Getinet M, Asaminew T, Tezera M, Gebeyehu G (2010) Milk yield and calf growth performance of cattle under partial suckling system at Andassa Livestock Research Centre, North West Ethiopia. http://www.lrrd.org/lrrd22/8/bite22136.htm . Accessed 21 Mar 2013
2. Agyemang K, Dwinger RH, Grieve AS, Bah ML (1991) Milk production characteristics and productivity of N’Dama cattle kept under village management in Gambia. J Dairy Sci 74:1598–1609
3. Amasaib EO, Fadel-Elseed AM, Mahala AG, Fadlelmoula AA (2011) Seasonal and parity effects on some performance and reproductive characteristics of crossbred dairy cows raised under tropical conditions of Sudan. Livestock Res Rural Develop 23(4):78. http://www.lrrd.org/lrrd23/4/amas23078.htm
4. Amsalu S (2003) Growth performance of Boran cattle and their Friesian crosses in Ethiopian. In: Proceeding of the 11th Annual conference of the Ethiopian Society Animal production (ESAP), Addis Ababa, Ethiopia, 2003–235
5. Asheber S (1992) Evaluation of the reproductive and preweaning growth performance of Fogera cattle and their F1 Fresian crosses at Andassa cattle breeding station in Ethiopia. (unpublished MSc thesis, University of Alemaya)