雏鸡饲粮蛋氨酸水平对硒生物效能的影响

用1日令—4周令白洛克雏鸡,1日令—6周令京Ⅲ系雏鸡,以玉米、黄豆、小麦等组成的饲粮,加或不加硒(Se,Na_2SeO_3)和(或)蛋氨酸(DL—Wet),测定了饲粮不同蛋氨酸水平对硒生物效能的影响。以体增重,料肉比,全血和血浆谷胱甘肽过氧化物酶(GSHPx)活力,组织硒含量等指标为判据,试验结果表明,在0.1,0.2ppm硒水平,雏鸡饲粮蛋氨酸水平影响亚硒酸钠硒的生物效能,对饲料硒的生物效能也有所影响。在本试验饲粮条件下,补加蛋氨酸提高硒的生物效能,而以硒0.2ppm和蛋氨酸0.5％的用量(饲料自身含量+添加量)为适宜配比。

EFFECT OF DIETARY METHIONINE LEVEI ON BIOPOTENCY OF SEIENIUM IN CHICKS

The purpose of the experiments is to study the effects of graded methionine levels in the diet on the biopotency of selenium in the 1 to 5—week-old White Plymouth Rock chicks and 1 to 6-week-old White Beijing Ⅲ Line chicks.A basal diet composed of maize, soybean and wheat supplemented with or without selenium as sodium selenite and/or DL—methionine was used. As evidenced by the parameters of growoth response, efficiency of feed utilization, glutathione peroxidase activity in blood and Selenium concentration in tissues, the dietary methionine levels in chicks were found to affect the biopotency of selenite at dietary selenium levels of 0.1, 0.2 ppm, and altered the biopotency of selenium in the feed slightly. Under experimental conditions, methionine supplementation increased the biopotency of selenium. The optimum amount of seleium and methionine, including that in the feed and the supplementation, was 0.2 ppm selenium and 0.5 per cent of methionine.