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2. Official Methods of Analysis,1984
3. Ethology of Free Ranging Domestic Animals;Arnold,1978
4. Milk Offtake, Growth and Feeding Habits of Camels in the Southern Rangelands of Ethiopia;Belet-Desalegne,1985
5. Some observations on the behaviour of dairy cattle with particular reference to grazing;Castle;J. Dairy Res.,1950