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Abstract
A total number of 32 does and 16 NZW rabbit bucks were sed in the present study in factorial design of (4 x4). The animals were divided to 4 experimental groups. The first group was fed according to NRC (1984) requirements and served as a control diet. The other 3 groups were fed different diets formulated to contain 120% protein (HP) or energy (HE) or both (HP & HE) ofNRC (1977) requirements, respectively. The results showed that libido, sperm motility, sperm-cell concentration and total-sperm output values were significantly (P<O.Ol) higher in NZW rabbit bucks fed diet contained 21.5% crude protein plus 3100 kcal DE (HE+HP)as compared to 21.5% crude protein(HP), 3100 kcaIIDE(HE) or 17% crude protein control group. However, semen- ejaculate volume and pH value of seminal NZW bucks fed diets contained different levels of crude protein and energy were not significant. The percentages of dead spermatozoa, sperm abnormalities and acorsomal damage were significantly (P<O.O 1) lower than bucks which fed the control diet. Hydrogen-ion concentration (pH) in semen NZW bucks was insignificantly increased in summer than the other seasons of the year. However, the percentage of sperm motility (%), sperm-cell concentration (x106 / ml) and total-sperm output (x106 /ejaculate) were significantly (P<O.Ol) increased in spring season, while the percentages of dead spermatozoa, sperm abnormalities and acrosomal damage were significantly (P<O.Ol) lower in spring than other seasons of the year. The interactions between feeding levels and seasons were significant by(P<O.Ol) affected volume, sperm-cell concentration, total-sperm output and sperm motility. from the results of the present work, it could be concluded that in summer season we must use improved diets contained 20% of energy and protein more than the NRC requirements to alleviation the heat stress effects on productive and reproductive performance of male and female rabbits under Egyptian conditions.