Natural Moldy Corn Production Performance And Meat Quality Of Growing-finishing Pigs

This study consist of 2 experiments for determining the impact of maize naturally contaminated with mycotoxins on performance and meat quality of growing-finishing pigs.In Exp.1,18 crossbred(Duroc×Large White×Landrace) with a mean weight(43.41±5.20) kg growing pis were randomly divided into 3 groups: control group given the basic diet with normal maize;25%mycotoxin group given the diet in which normal maize was 25%replaced by mycotoxin-contaminated maize; 50%mycotoxin group(50%replaced by mycotoxin-contaminated maize).Exp.2 28 crossbred(Duroc×Large White×Landrace) with a mean weight(55.61±3.89) kg growing pigs were randomly divided into 4 groups:control group given the basic diet with normal maize;25%mycotoxin group given the diet in which normal maize was 25%replaced by mycotoxin-contaminated maize;50%mycotoxin group(50% replaced by mycotoxin-contaminated maize),and 100%mycotoxin group(100% replaced by mycotoxin-contaminated maize),All pigs were provided with water and feed ad libitum.When body weight of pigs were up to 100-110kg,pigs were bleeded to slaughter,and calculate dressing percent.Liver,kidney,spleen and meat samples collected from left longissimus were prepared to measure organ index,drip loss,meat color and pH-value at 45min and 24h after slaughter.Average daily gain(ADG), average daily feed intake(ADFI),feed to gain ratio(F/G) of pigs,and feeding time in the 3 phases including form 0 to 14d,15d to the slaughter day,and overall phase were measured.The results showed that there were no significant differences for ADG, feeding time,meat quality indexes,and dressing percent among groups in two experiments(P＞0.05).However,in trial 1,the F/G of 25%mycotoxin group tended to reduce without significant differences in 15d-slaughter phase and over phase respectively compared with the control group(P＞0.05).50%mycotoxin group significantly reduce F/G in the same periods compared with the control group (P＜0.05).In trial 2,when compared with control group,100%mycotoxin group ADFI reduced significantly(P＜0.05),F/G tend to reduce(P＞0.05) in the first 14-days,and the performances of pigs tend to reduced in 15d-slaughter and overall phase.In concluding,the 6 kinds of mycotoins in the normal or contaminated maize were both check out.Deoxnivalenol was 4300μg/kg in the contaminated maize,and fumonisin was 6230μg/kg in the control maize.,The diets replaced with contaminated maize tended to elevate the heart index and reduce F/G of growing-finishing pigs. However,in 100%mycotoxin group ADFI was reduced,the whole performances were drop,and the feeding time was longer.The diet naturally contaminated with mycotoxins had no significant influences on dressing percent and meat quality.