Sokoto Journal of Veterinary Sciences

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Effect of graded levels and sources of protein on scrotal circumference and semen profile of Yankasa rams

A Jibril, IU Ate, PI Rekwot, CU Osuhor


The effect of graded levels and sources of protein on scrotal circumference and semen profile in Yankasa rams were investigated in a 96 day study. Twenty Yankasa rams aged 18-24months and weighing 21-30 kg with clinically normal genitalia were divided into 4 groups (A, B, C and D) of 5 rams each. All animals were fed Digitaria hay as a basal diet ad libitum and supplemented with the formulated ration at 2% of their respective live-weights. Iso caloric rations (10.50 MJ/kg DM ME) were formulated using non-conventional protein source (maize offal and dry layer litter) to contain 12.11% CP, 14.96% CP, and 17.94% CP and fed to groups A, B and C respectively. Another ration was formulated using conventional protein source (maize, wheat bran, groundnut cake, bone meal, vitamin premix and salt) to contain 12.26% CP and fed to group D (control group). Semen was collected every two weeks with the aid of a battery powered electroejaculator and then evaluated. Rams on 12.11% CP had significantly higher scrotal circumference than those on 17.11% C. and control. Significantly higher (P<0.05) semen volume was recorded for group B when compared with control group, but other groups showed no significant difference in volume of semen (P>0.05). Rams fed 14.96% CP diet had significantly higher semen concentration when compared with rams on 17.94% CP and control (P<0.01). Percentage gross motility, sperm morphology, sperm output and sperm viability were not influenced by level and source of protein (P>0.05). Thus, it is evident from this study that dry layer litter and maize offal compete favorably with conventional protein sources in improving scrotal circumference and semen concentration of Yankasa rams.

Keywords: Dry layer litter, protein, rams, semen, scrotal circumference.

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