影响蛋鸡血浆极低密度脂蛋白(VLDL)含量的环境因素

ENVIRONMENTAL FACTORS AFFECTING THE CONTENT OF VERY LOW DENSITY LIPOPROTEIN ( VLDL ) IN PLASMA OF LAYING HENS

生长阶段的蛋鸡血浆极低密度脂蛋白(VLDL)含量很少。开产后血中VLDL浓度与日粮蛋白质水平呈强正相关,并与产蛋率的高低相适应。日粮粗蛋白质为18％时,血中VLDL含量平均在4000～7100mg/100ml,可视为产蛋鸡正常高产水平。环境温度对血中VLDL浓度有影响,但不显著。蛋鸡在17～25℃下血中VLDL含量提高,温度升高(达29～33℃),VLDL含量与蛋白质食入量的相关程度降低。

The VLDL content in plasma was low in pullets during growing stage,but it was highly significantly correlated with the crude protein level in the diets when egg- laying stage began,and related to egg production rate. The average VLDL content, 4000~7100mg/100ml in plasma, could be considered as an insicator of high egg production level of laying hens receiving 18% CP in diets. The concentration of VLDL was affected by the ambient temperature, but no significant difference was found. The VLDL content was higher at 17~25℃, however, the correlation between CP intake and VLDL decreased while the temperature increased ( up to 29~33℃ ) .