分类: feed additives
作者: roura, e., ipharraguerre, i.r. and torrallardona, d.
出版物:journal of animal science, 85 (e-suppl. 1): 78
two trials were conducted in newly weaned 26d-old pigs to study the effect of the addition of an enhanced milky flavor to feed with and without its water-soluble formulation applied to drinking water. in trials 1 and 2 respectively, 192 and 132 piglets (landrace x pietrain) were distributed in four or three blocks of 12 pens according to initial body weight. pigs were offered free access to 1 of 6 diets differing only in the flavor dose (trial 1: 0, 250, 500, 750, 1000 and 1500 ppm and trial 2: 0, 1000, 2000, 3000, 4000 and 5000 ppm). additionally, half of the pens were offered flavored water during the first 28 (trial 1) or 14 (trial 2) days postweaning. single effects of feed treatments for the non-flavored water groups are reported here. at the end of the pre-starter phase (0-14 d postweaning) of trial 1, animals in the 1500 ppm group had the numerically highest adg (121 g/d) and adfi (180 g/d). when compared to the control diet, all diets treated with flavor improved (p < 0.05) feed efficiency during the starter phase (14-28 days postweaning), but overall (0-28 d postweaning) only the diet treated with 1500 ppm of flavor improved (p < 0.05) adg. however, when only equidistant doses were analyzed (0, 500, 1000 and 1500 ppm), a significant (p < 0.10) linear effect was observed for adg throughout the 28 days. in trial 2 flavor addition in feed resulted in increases in adg in the pre-starter phase (p < 0.01) and overall (p < 0.05). at the end of the trial, feed treated with 1000, 2000, 3000 and 5000, but not 4000, ppm of flavor increased (p < 0.05) adg by 21, 21, 19 and 26% respectively compared with the control. in trial 2, the response to increasing flavor dosage was quadratic (p < 0.01). it is concluded that adding the enhanced milky flavor to feed results in higher adg in weanling pigs and that such response is linear at low doses (up to 1500 ppm) but becomes quadratic for the high doses (1000 through 5000 ppm).