Berrio L F, Hebert J A
Poultry Science Department, Louisiana State University Agricultural Center, Baton Rouge 70803.
Poult Sci. 1990 Jun;69(6):972-6. doi: 10.3382/ps.0690972.
An experiment was conducted to determine if adding supplemental cholesterol to the feed or first adding it to the supplemental fat source of laying hen diets would result in differences in egg yolk and liver cholesterol levels. Five levels of cholesterol (0, .5, 1, 2, and 4%) and three levels of animal tallow (0, 4, and 8%) were used. The diets were randomly assigned and fed for 35 days to individually caged hens within each of six replicates. Eggs laid on or near Days 0, 7, 14, 21, 28, and 35 were used for cholesterol analysis. Liver cholesterol, egg production, and feed intake were also assessed. Mixing cholesterol with the fat source before feed incorporation did not promote higher yolk or liver cholesterol levels and were essentially the same as the method in which powdered cholesterol was added directly to the feed. A linear increase in yolk and liver cholesterol was observed with 0, .5, and 1% dietary cholesterol. Yolk cholesterol also increased linearly during the first 14 days of cholesterol administration. Further increases in yolk cholesterol, however, were not obtained with either the higher levels of dietary cholesterol or the extended feeding times.
进行了一项实验，以确定在蛋鸡日粮中添加补充胆固醇或先将其添加到补充脂肪源中是否会导致蛋黄和肝脏胆固醇水平出现差异。使用了五种胆固醇水平（0、0.5、1、2和4%）和三种动物脂肪水平（0、4和8%）。日粮被随机分配，并在六个重复组中的每一组内，分别饲喂单独笼养的母鸡35天。在第0、7、14、21、28和35天或接近这些时间产的蛋用于胆固醇分析。还评估了肝脏胆固醇、产蛋量和采食量。在将饲料混合之前将胆固醇与脂肪源混合，并不会使蛋黄或肝脏胆固醇水平升高，基本上与将粉状胆固醇直接添加到饲料中的方法相同。在日粮胆固醇含量为0、0.5和1%时，观察到蛋黄和肝脏胆固醇呈线性增加。在给予胆固醇的前14天，蛋黄胆固醇也呈线性增加。然而，无论是较高的日粮胆固醇水平还是延长的饲喂时间，都没有使蛋黄胆固醇进一步增加。
