Food restriction and reproductive development in wild house mice

Reproductive development was examined in wild house mice who had either unlimited or severely restricted access to food. The degree of food restriction was set at a level that allowed no body growth after 24 days of age. This treatment completely blocked reproductive development in females. In contrast, it had only minor effects on the reproductive development of males. Despite their stunted condition, food-restricted males developed normal numbers of sperm in their testes and vasa deferentia. They developed almost normal accessory tissues, and 8 of 10 inseminated test females when challenged at 8 wk of age. These results are considered primarily in relation to the opportunistic reproductive strategy of this species.