The Effect Of Type Of Diet And Enzyme Preparation On Growth Performance And Carcass Traits Of Ducks And Pigs

The aim of the current study was to study the effect of different diet types(including com-soybean-based diet,wheat-corn-based diet and wheat-soybean-based diet) on body weight gain,feed/gain and average daily feed intake for Cherry Valley Ducks and growing pig,respectively.And to study the supplementation of multi-enzyme in corn-soybean diet and wheat-soybean diet whether can elimination the bad effect of NSP which come from wheat to ducks and growing pigs or not.In Exp 1,729 Cherry Valley Ducks were randomly assigned to 1 of 9 dietary treatment groups with three replicates of twenty-seven ducks according to initial weight. Experimental period lasted 49 d.A feeding trial lasted 42 d and at 49 d of age a slaughter trial carried out.9 diets were used in this experiment:A,com-based diet;B,corn-based diet with 0.025%multi-enzyme;C,corn-based diet with 0.05%multi-enzyme;D, com-wheat-based diet;E,com-wheat-based diet with 0.025%multi-enzyme;F, corn-wheat-based diet with 0.05%multi-enzyme.The enzyme was composed of xylanase (4000u/g),β-glucanase(1000u/g) and cellulase(500u/g).The results of Exp.1 were as follows:1.Growth performance was significantly affected by diet types.The body weight gain of ducks from 0 to 3 wk were 53.4g in com-wheat diet and 52.3g in wheat-based diet, respectively.Compared with the corn-based diet treatment group,the body weight gain decreased by 1.89%and 3.93%(P＜0.01),respectively.The average daily feed intake of corn-based diet treatment group was higher than that of wheat-soybean meal,but without statistical significant(P=0.053).There were no significant differences in body weight gain,feed/gain and daily feed intake among different diet types in 4-6w and 0-6w.2.Feed to gain of ducks were improved by supplemental multi-enzyme to corn-wheat-based diet and wheat-based diet.The supplemental levels of multi-enzyme to com-based diet had no significant difference on daily feed intake,body weight gain of ducks.The supplemental levels of multi-enzyme to corn-wheat-based diet had no significant difference on daily feed intake,body weight gain of ducks,but feed to gain in 4-6w was significant decreased of E than that of D(P=0.047),and feed to gain in 0-6w had a trend toward a decrease.The levels of multi-enzyme had no significant difference on daily feed intake,body weight gain of wheat-based diet ducks,but feed to gain in 4-6w and 0-6w of H had a trend toward a decrease when compared with G 3.Types of diet and enzyme had an significant effects on eviscerated weights and leg muscle rate(P＜0.05),but had no difference on semi-eviscerated weights percentage and abdominal fat percentage.Exp.2.A total of 112 Duroc×Landrace×Yorkshire growing pigs(mean initial BW was 21 kg ) were randomly divided into 7 groups.Each group had 4 replicates,with 4 pigs each replicate.Pigs were provided to 7 diets,respectively,in a 28d growth study. Treatment including:A:positive control treatment,corn-based diet;B:negative control group 1,wheat-based diet with 30%wheat;C:negative control group 2,wheat-based diet with 55%wheat;D:negative control group 1 with enzymeⅠ(500g/t);E:negative control group 1 with enzymeⅠ(500g/t);F:negative control group 1 and enzymeⅡ(500g/t);G:negative control group 2 with enzymeⅡ(500g/t).The enzymeⅠwas composed of xylanase(4000u/g),β-glucanase(1000u/g) and cellulase(500u/g).The enzymeⅡwas composed of xylanase(8000u/g),β-glucanase(2000u/g) and cellulase (1000u/g).The results of Exp.2 were as follows:1.Effect of basal diet types on growth performance of pigs.During the whole experimental period(28d),A,B and C diet had no significant effect on feed intake of pig. When compared with positive group(499.3g),average daily gain of B with 30%wheat (489.3g) had no significant difference(P＞0.05),and average daily gain of C with 55% wheat(437.6g) was significantly decreased(P＜0.05).Compared with that of A(2.21), feed to gain of B with 30%wheat(2.31) increased by 4.52%(P＞0.05),and ratio of feed to gain of C with 55%wheat was significantly increased by 14.5%(P＜0.05).2.Adding multi-enzyme had no significant effect on growth performance of pigs. Compared with that of B group,D group and F group increased the daily weight gain by 3.27%and 1.84%,respectively,and decreased ratio of feed to gain by 4.33%and 5.19%, respectively.The daily weight gain and ratio of feed to gain compared with positive control treatment of D group and F group had no significant difference(P＞0.05).The E group and G group had no further improvement for growth performance of pigs.The following conclusion of this study could be drawn from:1.Feed intake of 0-3w had a trend toward a decrease with increasing the content of wheat.Average daily gain and body weight of 3w was significantly reduced;but which had no significant effect on growth performance of 0-6w and 4-6w.2.Addition to corn-wheat basal diet and wheat basal diet with enzyme reduced the feed to gain of ducks,and extremely improved the economic benefit. 3.Growth performance of growing pigs reduced with increasing the content of wheat.Average daily gain and feed to gain in 30%group had no significant difference when compared with corn basal diets(P＞0.05).Average daily gain and feed to gain in 55%group both were worse than that of corn basal diets(P＜0.05).4.Supplemental enzyme to wheat basal diets had no effect on average daily gain and feed to gain.5.The suitable quantity of wheat in growing pigs diet is 30%,and supplemental enzymeⅠand enzymeⅡto wheat basal diet have a similar effects.