损毁北京鸭下丘脑腹内侧核及腹外侧区对体重、器官重量的影响

实验用4周龄北京鸭，雌雄不拘．饲喂第3d，用2mA直流电对北京鸭下丘脑腹内侧核（VMH）和腹外侧区（LHA）进行双侧阳极损毁．于损毁后第17d进行脑灌流．以脑切片所在位置将28只动物分成4组：对照组（I）9只，损毁VMH组15只，其中VMH非脂肪肝组（Ⅱ）8只，VMH脂肪肝组（Ⅲ）7只，损毁LHA（Ⅳ）4只．观察各组体重、器官重的变化，结果如下：1）损毁当天，各组活重无显著性差异．2）灌流前各组体重结果：损毁VMH脂肪肝组（2.78±0.19）kg显著高于假损毁组（2．47±0．14）kg（P＜0．05），而损毁LHA组体重（1．73±0．2）kg显著低于假损毁组（P＜0．01）．3）测定屠体中，损毁VMH脂肪肝组肌胃重显著高于对照组（P＜0．05），而损毁LHA组肌胃重、胴体重、腹脂和胸腿肌重均显著低于对照组（P＜0．01）这提示：禽类同样存在有摄食中枢和饱中枢，它们对禽类的摄食活动起着重要的作用．

Ventromedial Hypothalamus (VMH) and Lateral Hypothalamic Area (LHA) Lesion in Beijing Duck: Effect on Body Weight and Orange Weights

The experiment here lesioned both VMH and LHA of Beijing ducks, at 4-5 weeks age. We poured into duck's brain seventeenth day after lesion. We divided 28 ducks into four groups by lesioned position of brain cut: control group (I) 9 ducks, VMH-lesioned without fat liver (Ⅱ) 8 ducks, VMH-lesioned with fat liver (Ⅲ) 7 ducks, LHA-lesioned 4 ducks. Then we measured the changes of body weight and orange weight each groups. The results showed: Body weight of Ⅲ group was higher than I group (P<0. 05), but Ⅳ group's body weight was lower than I group (P<0.01). Gizzard Weight of Ⅲ group was higher than I group (P<0. 05), but gizzard weight, bone-in carcass weight, weight of abdomen fat and muscle weight of chest and leg of Ⅳ group were lower than I group (P<0. 01 ). The results showed: There are food intake centre and full centre in poultry.