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Short-term feeding response in chicks to tea saponin

机译：雏鸡对茶皂素的短期喂养反应

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Tea saponin is known to suppress chick growth rate by decreasing feed intake, although the mechanism by which tea saponin decreases feed intake remains obscure. Since tea saponin has bitter taste, palatability was suggested to be a major factor affecting feed intake. However, there are some experimental results showing another possibility. The present experiment was conducted with chicks to evaluate the involvement of taste in the adverse effect of tea saponin on feed intake. When Single Comb WhiteLeghorn male chicks were given a casein diet for at least 4 h in experiments 1 and 2, 1 percent tea saponin depressed feed intake. The decrease in feed intake immediately after feeding (0-2 h) was rather mild and became severer with time (2-4 h). Removal of saponin from the diet increased feed intake, and this beneficial effect was manifested for the 2-4 h of the feeding period as compared with the lirst 2 h. In experiment 3, 40 mg of tea saponin was administered directly to the proventricutus by capsules to avoid the effect of taste or orally as a 1 percent solution. Despite the fact that chicks were given free access to the saponin-free diet after the administration, the depression in feed intake due to saponin was lasted until 8 h had passed, irrespective of different dosing methods. These results show that the aversion to the saponin-added diet docs not occur immediately after the ingestion of tea saponin and that the adverse effect of tea saponin on feed intake is carried over. Thus, it seems unlikely that taste is a primary factor decreasing feed intake in chicks given tea saponin.
机译：已知茶皂素通过降低采食量来抑制雏鸡的生长速度，尽管茶皂素降低采食量的机理仍然不清楚。由于茶皂素味苦，建议适口性是影响采食量的主要因素。但是，一些实验结果显示了另一种可能性。本实验是对小鸡进行的，以评估口味与茶皂素对饲料摄入的不利影响有关。在实验1和实验2中，当给Single Comb WhiteLeghorn雄性小鸡饲喂酪蛋白饮食至少4 h时，有1％的茶皂素降低了采食量。喂食后（0-2小时）采食量的减少相当轻微，并随时间（2-4小时）变得更严重。从日粮中去除皂苷会增加饲料的采食量，与最初的2 h相比，这种有益效果在2-4 h的采食期中表现出来。在实验3中，通过胶囊将40mg茶皂素直接施用至原肠，以1％溶液的形式口服或口服以避免口感的影响。尽管在给药后小鸡可以自由进食无皂苷的饮食，但不管采用何种给药方法，由于皂苷引起的采食量的降低一直持续到8小时。这些结果表明，摄入茶皂素后不会立即对添加有皂苷的饮食产生厌恶，并且茶皂素对饲料摄入的不利影响得以延续。因此，看起来不太可能是在服用茶皂素的雏鸡中降低饲料摄入量的主要因素。

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