Effects of Substituting Dried Potatoes for Corn on Growth Performance,Meat Quality Traits and Routine Blood Indexes of Growing-finishing Pigs
[Objective]This experiment was aimed to investigate the impact of incorporating varying proportions of dried potatoes into the diets of growing and fattening pigs on their growth performance,carcass traits,meat quality,and routine blood indexes.The primary objective was to determine the optimal ratio of potatoes substitution for corn in pig rations and assess its effects on pig performance,thereby providing a scientific foundation for the utilization of potatoes as pig feed.[Method]A total of 192 healthy three-way crossbred(Duroc × Landrace × Large White)growing and fattening pigs(half male and half female)with similar weights(33.0 kg±3.2 kg)were randomly divided into four groups,6 replicates per group and 8 pigs per replicate.The pigs in control group received the basal diet,while the pigs in experimental groups were fed diets in which 10％,20％and 30％of the total corn content in the basal diet was replaced with an equivalent amount of dried potatoes.This feeding regimen was maintained for 120 days,during which the growth performance,carcass traits,meat quality traits,and blood indexes of each group were assessed.[Result]The inclusion of 10％,20％and 30％dried potatoes in the ration did not cause significant effects on most of the indices related to fattening pig growth performance,carcass traits,and routine blood(P＞0.05)compared to control group.However,the eye muscle area of fattening pigs in 30％potatoes addition group exhibited a significant increase(P＜0.05).Moreover,a significant reduction in backfat thickness was observed with the addition of 20％and 30％dried potatoes(P＜0.05).Regarding meat quality,the incorporation of 20％and 30％dried potatoes led to a significant increase in intramuscular fat content of longissimus dorsi muscle(P＜0.05)and meat color brightness(L*45min)(P＜0.05),and a significant decrease in muscle shear strength(P＜0.05).There was a tendency for the drip loss rate to decrease with increasing potatoes content(0.05≤P＜0.1).The addition of 10％dried potato significantly increased the hematocrit and distribution width of red blood cells in blood of fattening pigs(P＜0.05).[Conclusion]The addition of 10％dried potatoes significantly increased some of the red blood cell indices associated with anemia.However,the inclusion of 20％and 30％dried potatoes notably reduced backfat thickness in growing and fattening pigs while increasing intramuscular fat content and decreasing muscle shear force.It was recommended to incorporate dried potatoes at a level of 20％to 30％in the feed for growing and fattening pigs.
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