THE EFFECT OF DIFFERENT PER CENTS OF PROTEIN IN THE DIET ON BACHELOR AND VIRGIN RATS

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Abstract
Five groups of bachelor and virgin rats (I to V) were fed synthetic diets containing 10.3, 142, 18.2, 222 and 26.3% of protein, respectively. Each animal was segregated in a revolving cage during its life span. The order of efficiency of these diets as determined by total miles run was, from greatest to least: 14.2%, 5104 miles; 18.2%, 5041 miles; 22.2%, 4691 miles; 26.3%, 3802 miles; 10.3%, 3461 miles. Both sexes reached their maximum weight at later ages than mated animals. The duration of sexual life of the [female][female] was greatest in group II and least in groups I and V. The sexual span was longer and the age at which estruation ceased was greater than has been determined by mating tests. The life span of both sexes was shortest in group V. It was longest in the [male][male] of group III and the [female][female] of group II.

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