AGENT FOR IMPROVING FEED CONVERSION RATE, AGENT FOR IMPROVING SURVIVAL RATE, AGENT FOR IMPROVING NUMBER OF EGGS LAID BY EGG-LAYING HENS, METHOD FOR GIVING SAME TO ANIMALS, AND FEED

摘要

Provided are: an agent for improving feed conversion rate; an agent for improving survival rate; an agent for improving number of eggs laid by egg-laying hens; a method for giving these agents to animals; and a feed, each directly and largely contributing to the improvement in the productivity in an animal farm.At least one kind of active component selected from among cysteine and cysteine derivatives is given to animals. The active component may be added to drinking water or a feed. Examples of the cysteine and cysteine derivatives include acetyl cysteine (NAC), S-methyl-L-cysteine (SMC), cysteine malate and acetyl cysteine amide.