The Effect Of Starch Sources On Growth Performance,Nutrient Digestibility And Blood Biochemical Indicators In Growing-finishing Pigs

The object of this experiment was to determine the effect of different starch sources on growth performance, nutrient digestibility and blood biochemical indicators in growing-finishing pigs to find the effect on growing-finishing pigs’ production performance: 1.The effect of starch sources on growth performance in growing-finishing pigs.Fifteen PIC growing-finishing pigs with similar baby weight of 24.49±1.34 kg were randomly assigned to three groups. Every group has five pigs which will be fed separately in the stages of 25~50 kg, 50~75 kg, 75~100 kg. The three groups are corn starch group(control group), sticky rice starch group(RDS) and resistant starch group(50% potato starch replaces 50% corn starch of control group). The results indicated that daily gain and feed conversion ratio in control group with corn starch was better than the 50% corn- 50% potato starch group in the stage of 25~50 kg, significantly(P<0.05). The food/gain ration in sticky rice starch group at the weight of 50~75 kg was significantly higher than corn starch group and 50% corn- 50% potato starch group(P<0.05),and the 50% corn- 50% potato starch group significantly increased the daily feed intake in the phase of 75~100 kg(P<0.05). 2. The effect of starch sources on Nutrient Digestibility in growing-finishing pigs.The digestibility of nutrients in fecal of the test pigs in the stages of 25~50 kg, 50~75 kg, 75~100 kg were detected. The results showed that during the weight of 25~50 kg, the Ca absorption in the test group 1 was significantly higher than the control group(P<0.05), and the Ca absorption in the test group 2 was significantly higher than control group(P<0.01); The P absorption in the test group 1 and the test group 2 were higher than the control group(P<0.05). During the weight of 50~75 kg, the digestibility of dry matter and energy in the test group 1 and the test group 2 were higher than the control group(P<0.05),and the digestibility of the crude protein in the test group 2 was significantly higher than the control group(P<0.05). The Ca absorption in the test group 1 and the test group 2 were higher than the control group(P<0.01). the P absorption in the test group 2 was significantly higher than control group(P<0.05); the P absorption in the test group 1 was significantly higher than control group(P<0.01). During the weight of 75~100 kg, the Ca, P absorption in the control group were significantly higher than the test group 1(P<0.01). 3. The effect of starch sources on blood biochemical indicators in growing-finishing pigs.The blood biochemical indicators of the test pigs in the 50 kg and 75 kg were detected. The results showed that the plasma glucose and insulin concentration of pigs in post-prandial was no significant diversity among groups(P>0.05). The TC in sticky rice starch group was significantly higher than the other two groups(P<0.05), and the TG in potato was significantly lower than the other two groups(P<0.05).In conclusion, corn starch as the main energy source of feed can increase growing-finishing pigs’ daily gain, lower feed conversion ratio and improve the growth performance in the early stage. Sticky rice starch and potato starch can increase growing-finishing pigs’ digestibility of Ca and P, which has a important significance on skeletal development. During the weight of 50~75 kg, Both the starch and potato starch could significantly increase the digestibility of nutrient substances. The levels of lipid substances in the blood of PIC pigs can be adjusted by the sticky rice starch and potato starch, and both of starch can adjust the body fat metabolism in different degrees.