Effects Of Difference In Digestibility Of Dietary Starch On Growth Performance, Carcass Characteristics And Meat Quality In Growing-finishing Pigs

Starch is the main component of feed grains carbohydrates, is also a major source of energy needed for animals, representing over 50% of aquaculture production costs. But studies show that because of the different sources of starch composition and structure, its digestion speed and location was different in animals, and the energy supply in different ways,so their supply efficiency was also different.This experiment aimed to study the effects of different source of starch on Growth Performance, Carcass Characteristics and Meat Quality in growing-finishing Pigs.A total of 15 crossbred PIC healthy fattening pigs were randomly divided into three groups(n = 5 replicates of a pig). Group 1 was fed maize starch as control group, group 2added 50% potato starch, group 3 using stick rice starch, the experiment lastedthree months.The measurement results were as follows:1. Growth performance.The feed conversion(feed consumption/body weight gain) of maize starch group was lower than stick rice starch group and potato starch group( P <0.05).While the average daily gain of corn starch group was significantly higher than stick rice starch group and potato starch group(P < 0.05). But there was no significant difference among three groups in the average daily feed intake(P > 0.05).2. Carcass characteristics. Potato starch could significantly reduced body length and fat ratio,improving the lean meat(P < 0.05), reduced the skin rate(P < 0.01). Stick rice starch group significantly reduced longissimus muscle areaand skin rate(P < 0.05), improved bone ratio(P< 0.01). The heart and liver weight of potato starch group were significantly lower than corn starch group and glutinous stick starch group.The spleen weight of corn starch group was lower than potato starch group and glutinous stick starch group.(P <0.05).3. Meat quality. The shear force of potato starch group was significantly lower than corn and stick rice starch group(P < 0.01), but cooked meat rate was significantly higher than stick rice starch group(P < 0.05). Intramuscular fat content of stick rice starch group was significantly lower than maize starch group(P < 0.05), oleic acid was significantly higher than maize starch and potato starch group(P < 0.05). The multiple unsaturated fatty acidcontent of potato starch group was significantly higher than maize starch and stick rice starch group(P < 0.05).In a word, the growth performance of maize starch group was the best. Maize starch was favor of fat deposition. Potato starch was conducive to muscle development. Stick rice starch was good for bone growth. Potato starch could reduce heart and liver weight. Patato group could improve the meat quality of animal.