Gamallo A, Villanua A, Beato M J
Physiol Behav. 1986;36(5):835-7. doi: 10.1016/0031-9384(86)90439-7.
The effect of being reared in a crowd for 6 continuous weeks postweaning on body weight gain, food intake and gland weight (thymus, adrenals and testes) was studied in Sprague-Dawley adult male rats. Crowd-reared rats (10 per cage) showed a significantly lower body weight at the end of the crowding period as compared to control rats (5 per cage). After 200 days of being reared under the same conditions (5 per cage), the body weights of crowd-reared rats were still significantly lower than those of control rats. However, the body weight gain during this period was the same for both groups. Crowd-reared rats also had significantly lower thymus weight and higher adrenal gland and testes weights as compared to those weights of control rats. In addition, food intake was similar for both groups.
在断奶后连续6周饲养于拥挤环境中对成年雄性斯普拉格-道利大鼠体重增加、食物摄入量和腺体重量（胸腺、肾上腺和睾丸）的影响进行了研究。与对照大鼠（每笼5只）相比，拥挤饲养的大鼠（每笼10只）在拥挤期结束时体重显著更低。在相同条件下（每笼5只）饲养200天后，拥挤饲养的大鼠体重仍显著低于对照大鼠。然而，在此期间两组的体重增加量相同。与对照大鼠的相应重量相比，拥挤饲养的大鼠胸腺重量显著更低，肾上腺和睾丸重量更高。此外，两组的食物摄入量相似。
