Abstract
The hypothalami of thirty-four laying hens (W. L.) were electrolytically lesioned in order to observe changes of their feed intake and body weight. They were autopsied about twenty-eight days after the operation. Five experimental hens which were lesioned the ventral part of N. hypothalamic inferior to N. tuberalis, showed hypothalamic hyperphagia and obesity. In these hyperphagic hens the daily mean feed consumption was 178.7g, and at the peak from the fourth day to the eighteenth day they took more than 200g daily. The mean body weight gain during the experimental period was 460g. In the sham-operated control the feed consumption was 113.8g, and the body weight gain was 53g. The differences of the feed consumption and the body weight gain between two groups were highly significant (P<0.001). Two slightly hyperphagic hens whose satiety center were unilaterally lesioned showed intermediate results the feed consumption 157.5g, the body weight gain 395g.The weights of abdominal fat and liver of the hyperphagics increased. Their ovaries were atretic, but the atresia of ovary seemed not to be connected to the obesity, since eight hens of the non-hyperphagics had atretic ovaries and moderate amounts of abdominal fat.Diurnal variation of feed intake was observed for three days from the seventeenth day. Commercial mash feed was given at 9:00, and the feed consumption was estimated hourly by weighing the feeders. As results, the control took very much within one hour after feeding, and thereafter in the daytime they took invariably. Before feeding in the morning they took slightly, though feeds remained in their feeders. The hyperphagics took greatly much more than the control within a few hours after feeding, and also before feeding they took significantly much more. And in the other time they took more or so. Therefore the information for satiety from the crop and the digestive tracts was supposed not to be accepted, although there was not any evidence about the chemical informations.
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