[Body composition of feed-restricted female rats, at the first estrus]

At first estrus the feed-restricted rats were older and, proportionally to the age, leaner than the well fed animals. They had attained a greater proportion of protein and lesser proportion of water and fat; however the animals of the two restricted diet groups and the well fed group had the same weight. First estrus was simultaneous with vaginal opening in 90% of the well fed animals, in 20% of the group I and in 0% of the group II.