الفهرس 
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Abstract
The objective of this study was to determine the effect of fat, probiotic and zinc-enriched diets on age of puberty, body weight and body size, testicular measurements, testosterone concentration, sexual desire, semen characteristics and freezability of Barki ram semen. Twenty two Barki rams were randomly assigned into four groups; Group I (n=5) was fed the basal diet enriched with 3.7% of dry fat/kg concentration/day, Group II (n=5) was fed a basal diet-enriched with 10gm of probiotic /head/day, Group III (n=6) was fed on the basal diet enriched with 100 mg of 10% zinc chelated with methionine/ kg dry matter/ day and Group IV (n=6) was served as control. Results showed that the age of puberty, as determined by the complete penis prepuce separation and the first successful ejaculation, was significantly shorter in animals fed a diet enriched with fat, followed by zinc and then probiotic as compared with control. The body weight, body size, testicular measurements and plasma testosterone concentrations were significantly higher in rams fed a diet enriched with fat, followed by zinc and then probiotic than control animals. Sexual desire, quantity and quality of semen were significantly improved in animals fed a diet enriched with fat, zinc and probiotic, respectively. Meanwhile, semen freezability was improved in animals fed a diet fortified with fat and zinc with no significant improvement in animals fed a probiotic-enriched diet. Moreover, freezing of Barki rams semen in straws or pellets had no significant effect on freezability of their semen.