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adrenal glands adrenal indices adrenal weight adult female age class ANALYSIS OF VARIANCE Area Bittner and Chapman body fat index breeding season brown rat Chapman in press Christian 1963b Christian and Davis Clements Island population Clements Island rats climatic Collected on St condition index corpora lutea Davis and Hall Eastern Cottontail Ecology embryos environmental fat indices female Norway rats female rats Fluctuations in Mean freeze free days high densities higher house mouse INDICES OF NORWAY intrauterine mortality juveniles lactation Mammal Maryland Marys County Mean Adrenal Indices Mean Body Fat mean litter mean temperature MInth night trapping Norway Rats Collected NS Sex occurred ovaries ovulation ovulation rate peak percent placental scar population density positive correlation pregnant females rats in Baltimore RATS ON ST Rattus reproductive activity reproductive parameters resorption rate rodents Seasonal Fluctuations sex ratio SPEARMAN'S spleen index splenic stress subadult summer tion urban rats uterine horn winter