Effect of choline chloride on the performance of laying hens
There is a view that the young layer’s ability to partially meet the methionine requirement by using choline chloride is higher than that of the old layer, so the young layer’s choline requirement is higher than that of the old layer. It is inferred from this that the requirements and tolerance of choline in laying hens of different ages may be different. This is consistent with the findings in this experiment that choline chloride has different effects on the performance of laying hens of different ages.
Comprehensive choline chloride’s effects on egg production rate, egg weight and feed intake, adding choline chloride to feed higher than 1 000 mg/kg will have an adverse effect on the performance of laying hens. Among them, when the additive dose reaches 1 000 mg/kg, it has an adverse effect on the egg production rate and feed-to-egg ratio, especially when it reaches 4 000 mg/kg, it has a significant adverse effect on the egg production rate; the additive dose reaches 8 000 mg/kg Time significantly reduces egg weight and feed intake. Unfortunately, due to the setting of the level of choline chloride, it is impossible to determine whether the addition of choline chloride below 1,000 mg/kg at the age of 31 to 36 weeks will have an adverse effect on the production performance.
The safety evaluation of doses below 1000 mg/kg needs further study.
luInfluence of Choline Chloride on Egg Quality
The color of egg yolk is one of the important indicators to measure egg quality, and it is also one of the factors that affect the performance of poultry eggs. This experimental study found that at the age of 20-22 weeks, the egg yolk color of each choline chloride added group was significantly higher than that of the non-added group, but at 38 weeks of age, 1,000, 2,000, and 4,000 mg/kg choline chloride The egg yolk color of the added group was significantly higher than that of the non-added group, while the egg yolk color of the 16 000 mg/kg added group was significantly lower than that of each added group.
① Adding choline chloride higher than 1 000 mg/kg to the diet reduces the egg production rate and increases the feed-to-egg ratio; adding choline chloride higher than 4 000 mg/kg to the diet reduces egg weight and feed intake.
② Adding 1 000 and 2 000 mg/kg choline chloride to the diet increases the thickness and strength of the eggshell; adding less than 4 000 mg/kg choline chloride has no significant effect on the protein height and the Huff unit; add
Adding 1,000, 2,000, and 4,000 mg/kg choline chloride significantly improves the color of egg yolk; adding choline chloride to the diet increases the phosphatidylcholine content of whole eggs, and adding 16 000 mg/kg choline chloride significantly increases egg yolk Phosphatidylcholine content.
Keywords: laying hens; choline chloride; performance; egg quality