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The effect of protein intake on the onset of puberty in Bunaji and Friesian x Bunaji crossbred bulls in Nigeria



The effect of protein intake on the onset of puberty in Bunaji and Friesian x Bunaji crossbred bulls in Nigeria



Theriogenology 28(4): 427-434



Twenty-one Bunaji (BJ) bulls and 21 Friesian .times. Bunaji (FR .times. BJ) crossbred bulls, approximately 6 mo of age were divided after weaning into two groups and fed isocaloric rations (2.40 ME Mcal/Kg/DM) containing crude protein levels of 14.45% (high protein) and 8.51% (low protein) for a period of 16 mo to determine the effect of protein intake on puberty. Animals on high protein diets ejaculated first motile spermatozoa and attained puberty at significantly (P < 0.05) earlier ages than those on low protein diets. Mean ages at puberty in mo for BJ on low and high protein diets were 15.50 .+-. 0.51 and 14.82 .+-. 0.68 and for FR .times. BJ, the ages were 17.79 .+-. 0.82 and 12.94 .+-. 0.60, respectively. The animals on high protein diets at point of puberty had significantly (P < 0.05) lighter body weights, smaller scrotal circumference, lower chest girth, better body condition score and better sperm quality than those on low protein. There were no significant (P < 0.05) differences in withers height or volume of semen at puberty for the two protein diets.

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Accession: 006652707

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PMID: 16726325


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