초록

The fertility of female mammals can be improved by dispensing once or within a short time repeatedly a high dosage of tyrosine. The dispensation can be carried out at will intravenously or orally.

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A process of increasing fertility in a female mammal having a cycle comprising supplying the female mammal with a sufficient amount of L-tyrosine or an alkali metal or alkaline earth metal salt of L-tyrosine, an alkyl ester of L-tyrosine having 1 to 5 carbon atoms in the alkyl group, glycyl-L-tyrosi

A process of increasing fertility in a female mammal having a cycle comprising supplying the female mammal with a sufficient amount of L-tyrosine or an alkali metal or alkaline earth metal salt of L-tyrosine, an alkyl ester of L-tyrosine having 1 to 5 carbon atoms in the alkyl group, glycyl-L-tyrosine, an N-fatty acid acyl substituted L-tyrosine having 2 to 22 carbon atoms in the acyl group or N-hydroxmethyl L-tyrosine to increase the fertility of the mammal.