Effect Of Probiotic And Lipid Protein On Pig Production And Acting Machanism

The effects of probiotic and lipid protein on suckling and weaning piglets were studied. 250 suckling piglets aged of 7 days were randomly allotted to 5 treatments, one treatment included five replications of 10 pigs per replication. The trial period lasted for 28 days from 7 to 35 days of age. The weaning day was at 28 days old. Those groups included: group 1 (fed with basal diet without antibiotic, control group), group 2 (basal diet + 0.05% probiotic premix) , group 3 (basal diet + 0.1% probiotic premix) , group 4 (basal diet + 0.2% probiotic premix), group 5 (basal diet + 80ppm biomycin). The result indicated that the average daily gain(ADG) of group 3 was 1.99 bolds more than the control group, the feed/gain(F/G) of group 3 was 18.21% less than the control group (P>0.05) , and the microorganism number in piglet's gut was no significant different among 4 groups.Another 100 suckling piglets aged of 7 days were randomly allotted to 2 treatments, one treatment included five replications of 10 pigs. The trial time lasted for 28 days from 7 to 35 days of age. Those groups included: group 1 (contained 5% whey powder and 2% fish meal, control group), group 2 (7% lipid protein as substitution of 5% whey powder and 2% fish meal). The result indicated that ADG in group 1 was 31.87% higher than that in group 2 (P >0.05 ) .150 weaning piglets aged of 35 days were randomly allotted to 5 treatments, one treatment included three replications of 10 pigs. The trial time lasted for 25 days from 35 to 60 days of age. Those groups included: group 1 (fed with basal diet without antibiotic, control group), group 2 (basal diet + 0.025% probiotic premix) , group 3 (basal diet + 0.5% probiotic premix) , group 4 (basal diet + 0.10% probiotic premix) , group 5 (basal diet + 80ppm biomycin) . The results indicated that the F/G of group 3 was 8.91 % less than the control group (P > 0.05). The mortality of group 3 and 4 was 0%, which was much less than the other three groups (P<0.05) . The E coli number in caecum contents in group 3 was much less than control group (P< 0.05) . The small intestine thickness of group 3 was significantly lower than the control group (P<0.05) ; the large intestine thickness of group 3 was 41.37% lower than the control group; large intestine crypt depth was 60.19% higher than the control group; large intestine villi height was 58.54% lower than the control group(P<0.05); the caecum crypt in group 3 was 16.26% lower than the control group (P<0.05) . The aspartate aminotransferase (GOT) in group 3 was 4.15 times higher than control group (P<0.05) ; lactate dehydrogenase (LDH) was 5.76 times higher than control group (P<0.05). The immunoglobulin A in group 3 was 60.06% higher than control group (P>0.05) . The amylase activity in stomach content in group 3 was 1.98 times higher than control group (P<0.05) ; the protease activity in gastrointestinal tract (GIT) content was much higher than control group (P>0.05) .32 piglets aged of 71 days were randomly allotted to 2 treatments, the trial time lasted for 30 days from 71 to 100 days of age. Those groups included the control group with antibiotic, trial group with 0.05% probiotic premix. The results indicated that the F/G was lower than control group, and ADG was higher than control group (P >0.05 ) . The lactic acid bacteria number in trial group was much higher than control group (P<0.05) .100 weaning piglets aged of 35 days were randomly allotted to 2 treatments, one treatment included five replications of 10 pigs. The trial time lasted for 25 days from 35 to 60 days of age. Those groups included the control group with 2% fish meal and the trial group with 2% lipid protein as substitution by fish meal. The results indicated that the F/G of trial group was 31.03% lower than control group (P<0.05) ; the diarrhea ratio in trial group was lower than control group; the mortality ratio was 19.20% higher than control group (P>0.05) .It was concluded that the probiotics could improve growth performance of suckling and weaning piglets. The treatment group with probiotic had the higher lactic acid bacterial number in pig gut than other treatment group. 7% lipid protein as substitution by 2% fish meal and 5% whey powder had the similar growth performance with the the treatment with fish meal and whey powder. The probiotic could decrease mortality and small intestine thickness, promote protein metabolism of liver, increase the level of humoral immunity.