Dietary supplementation with citric acid and acid Lac could improve feed conversion efficiency.

日粮中添加乳酸宝和柠檬酸可以提高饲料的转化效率。

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The changes of molecular weight, life under heat, acid value, hydroxyl value and chlorine content of lac resin during bleaching and de-chlorinating processes have been studied.

本文研究了紫胶树脂在漂白和脱氯过程中分子量、热寿命、酸价、碘价、羟基值和氯含量的变化情况。

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The fact that copper pollution of laccaic acid in stick lac could not be avoided was concluded after considering its biological source and chemical nature.

从紫胶的生物来源和紫胶红色素的化学本质分析，紫胶原胶中紫胶红色素的铜污染是不可避免的。

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