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In the first experiment, the effects of two levels of dietary protein and energy on the number of spermin the excurrent ducts, on the weight of the testes and on the weight of the seminal vesicles wereexamined in two-year-old Merino rams from two Peppin and two non-Peppin strains. There werelarge effects of diet on each of the three characters, the effect of energy intake being much greater thanthat of protein intake. In addition, there were significant differences between strains: Peppin strainrams had higher sperm numbers and testicular weights than non-Peppin strain rams, even thoughliveweights were similar.

Effect of Protein and Energy Content of the Diet on the Rate of Sperm Production in Rams