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Gojam, Y. ,  Tegegne, Azage ,  Gebrewold, A. ,  Bekele, T. ,  [The influence of weaning age and different calf starter rations on testis diameter, scrotal circumference and body weight of Friesian crossbred bull calves at different ages] ,  The influence of weaning age and different calf starter rations on testis diameter, scrotal circumference and body weight of Friesian crossbred bull calves at different ages