Abstract
1. 1.Lengths of some external organs (tails, feet and ear pinnas) were measured during the development in 12 warm-reared and 12 control rats. In post mortem studies those organs as well as both thermolytic (submaxillary salivary gland) and nonthermolytic (kidney, heart, liver and adrenal gland) internal organs were weighed in the same rats. 2. 2.Starting from the age of 3 months warm-reared rats became leaner and lighter and their tails grew longer than in the age-matched control animals. 3. 3.Warm rearing led to elevation in masses of thermolytic organs such as tail and salivary gland while masses of nonthermolytic organs such as kidney, liver, heart and adrenal gland remained unchanged. 4. 4.All those changes due to warm rearing were much more accentuated in female than in male rats. 5. 5.In conclusion, warm rearing stimulates hypertrophy of thermolytic organs which seems to be more important for females in the context of pregnancy and caring for young.
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