Effects of Synbiotics and Antibiotics on Nutrient Digestibility and Serum Antioxidant Function of Weaned Piglets

The paper was to investigate the effects of synbiotics and antibiotics on nutrient digestibility and serum antioxidant function of weaned piglets. Totally 216 individuals of 35-day-old piglets were randomly divided into three groups, six replicates for each group, and each replicate contained 12 piglets. The first group was antibiotics group, 20 g,/t colistin sulfate （active ingredients） were added in the basal diet; the second group was synbiotics group, 250 g/t synbiotics （contai- ning xylooligesaccharides, oligochitasan, Bacillus subtilis and Clostridium butyricum） were added in the basal diet; the third group was combination group, 20 g/t colistin sulfate and 250 g/t synbiotics were added in the basal diet. The whole trial lasted 28 d. The results showed that there was no difference between synbiotics group and antibiotic group in growth performance, nutrients digestibility or antioxidant indicators （ P 〉 0.05 ）. Compared with the piglets in synbiotics group and an- tibiotic group, piglets in combination group had higher digestibility of dry matter and organic matter, and higher T-SOD activity in serum （ P 〈 0.05 ）. It is conclu- ded that synbiotics can replace antibiotics for piglets at 35 -63 days of age. Synbiotics and antibiotic had the synergistic effect on nutrient digestibility and antioxi- dant function of piglets.

Effects of Low Protein Diets on Nutrient Digestibility and Excretion in Finishing Pigs

The experiment was conducted to study the effects of low protein diets on nutrient digestibility and excretion of finishing pigs. For the 30-d trial,fortytwo duroc × landrace × yorkshire( DLY) finishing pigs with the initial weight of( 91. 13 ± 1. 64) kg were randomly divided into two groups,with three replicates in each group. The pigs in the two groups were fed with different crude protein( CP) levels( control groups: 15. 49% and low protein groups: 12. 59%). The results showed that:( 1) The digestibility of dry matter and crude fat( CF) in low protein groups were increased significantly( P < 0. 01),but there were no significant differences in digestibility among CP,calcium( Ca) and phosphorus( P);( 2) The digestibility of arginine( Arg) in low protein groups were 2. 02%( P <0. 05) lower than that in control groups. However,the digestibility of other amino acid were no difference between two groups;( 3) The nitrogen( N) excretion in low protein groups was 23. 96%( P < 0. 05) lower than that in control groups,but there were no significant differences in excretion among organic matter,P and Ca( P > 0. 05). The results showed that 2. 9% reduction of the CP in diets could improve nutrient digestibility and reduce the excretion of N,but reduced the digestibility of Arg.

Research Progress on the Effects of Dietary Fiber Regulating Gut Microbiota on Sows Reproductive Performance

Dietary fiber(DF)is an essential nutrient in sow diet.It can increase sow satiety and prevent constipation.It can also regulate sow gut microbiota,and the interaction between the two can regulate sows reproductive performance and metabolic function and the growth performance of offspring piglets.It can be seen that the benefits of DF in sow production are inseparable from the interaction of gut microbiota.This paper reviewed the effects of DF on the diversity of sows gut microbiota,and the effects of DF-gut microbiota interaction on sows gut microbiota,metabolism,ovulation and lactation,as well as on offspring production performance,aiming to provide a new strategy for the application and research in sow diet.