The fat content of sows' milk is increased thereby increasing the energy supplied to the sow's piglets, by administering a phenethanolamine of formula (I):
wherein:
R is hydrogen, hydroxy, methoxy or amino;
R¹ is hydrogen or cyano;
R² is C₂-C₄ alkyl or a group of formula (II)
R³ is hydrogen or methyl;
R⁴ is hydrogen, hydroxy, fluoro, nitro or carbamoyl;
provided that:
R and R⁴ are not both hydrogen;
R⁴ is not hydroxy when R is hydrogen;
R is hydrogen or amino when R¹ is cyano;
R is hydrogen, hydroxy or methoxy when R¹ is hydrogen;
R² is C₂-C₄ alkyl when and only when R¹ is cyano;
or a physiologically acceptable acid addition salt thereof.
通过施用式 (I) 的
苯乙醇胺,可增加母猪乳汁中的脂肪含量,从而增加供应给母猪仔猪的能量:
其中
R 是氢、羟基、甲氧基或
氨基;
R¹ 是氢或
氰基
R² 是 C₂-C₄ 烷基或式(II)的基团
R³ 是氢或甲基;
R⁴ 是氢、羟基、
氟、硝基或
氨基甲酰基;
条件是
R 和 R⁴ 不同时为氢;
当 R⁴ 为氢时,R⁴ 不是羟基;
当 R¹ 为
氰基时,R 是氢或
氨基;
当 R¹ 为氢时,R 是氢、羟基或甲氧基;
当且仅当 R¹ 为
氰基时,R² 为 C₂-C₄ 烷基;
或其生理上可接受的酸加成盐。