| 摘要 |
A method for increasing the weight gain and/or improving the feed utilization efficiency of livestock is described which comprises the oral or non-oral administration to livestock of an effective, non-toxic amount of a compound of formula (XX): <IMAGE> (XX) or a salt thereof, in which W is phenyl optionally substituted by halogen or trifluoromethyl, or a benzofuran-2-yl group, R1x is hydrogen or methyl, R2x is carboxyl or a group O-Z4-CO2H or an ester or amide thereof; a group O-E1-NR3xR4x or a group O-E1-OR5x, wherein R3x, R4x and R5x each represents hydrogen or C1-6 alkyl, Z4 is a C1-6 straight or branched alkylene chain, x is 1 or 2, y is 2 or 3, and E1 is C2-7 straight or branched alkylene chain with at least two carbon atoms separating the two heteroatoms in the group R2x. Also described is a veterinarily acceptable premix formulation administrable in a veterinarily effective amount in feed or water comprising a compound of the formula (XX) or, where appropriate, a veterinarily acceptable salt, ester or amide thereof; in association with a veterinarily acceptable carrier therefor. Additionally, a veterinarily acceptable premix formulation comprising from about 0.001% to about 95% by weight of a compound of formula (XX) administrable in feed or water or, where appropriate, a veterinarily acceptable salt, ester or amide thereof, together with a veterinarily acceptable carrier. |
