Effects Of Dietary Types And Dietary Supplementation With Yeast Cultures On Nutrient Digestibility And Ileal Chyme Characteristics Of Growing Pigs

The purpose of this experiment was to study the effects of different diet types and dietary yeast cultures on apparent digestibility of nutrient end of ileum,apparent digestibility of whole intestine,apparent digestibility of amino acid end of ileum,digestive enzyme activity,p H and viscosity of intestinal chyme of growing pigs.The test was designed using a 2×2 factor and tested according to a repeated Latin square procedure.Eight boars(35.63±0.76kg)of du×long×big ternary hybrid castrated with the same age and good body condition were selected and random divided into 4 treatment groups,with 2 replicates for each treatment and 1 growth pig for each repetition.The following four experimental diets were fed :(1)corn type diet,(2)corn type diet + 0.5% yeast culture,(3)barley sorghum diet,(4)barley sorghum diet + 0.5% yeast culture.Fecal urine was collected by complete fecal collection,and chyme was collected by simple T-fistula for sampling and analysis.The results showed that:Compared with the barley sorghum diets,the corn type diets significantly increased the terminal ileum apparent digestibility of the crude protein(P<0.01).For corn type diets,the addition of yeast culture to the diet significantly increased the terminal ileum apparent digestibility of the dry matter(P<0.05).The yeast culture added in the diet and the type of diets had no significant effect on the terminal ileum apparent digestibility of the growing pig calcium,phosphorus,crude ash,crude fiber,neutral detergent fiber and acid detergent fiber(P>0.05).Compared with the barley sorghum diets,the corn type diets significantly increased the apparent intestinal digestibility of crude protein(P<0.01),Significantly reduced the apparent intestinal digestibility of acid detergent fiber(P<0.05).Compared with the control group,the addition of yeast culture to the feed had a tendency to increase the apparent intestinal digestibility of the growing pig acid detergent fiber(P < 0.10).The yeast culture added to the diet and the type of diets had no significant effect on the dry matter,calcium,phosphorus,crude ash,crude fiber and neutral detergent fiber digestibility of growing pigs(P>0.05).Compared with barley sorghum diets,corn type diets significantly increased growing pig of lysine,phenylalanine,threonine,isoleucine,leucine,valine,arginine,methionine,histidine,aspartic acid,serine,glutamic acid,glycine,alanine,tyrosine,proline and cystine terminal ileum apparent digestibility(P<0.01).Compared with the control group,the addition of yeast culture in the diet significantly increased tryptophan terminal ileum apparent digestibility(P<0.01);the apparent digestibility of the lysine end of the ileum increased(P< 0.10).The yeast culture added to the diet and the type of diets had an interaction with the apparent digestibility of tyrosine in growing pigs(P<0.05).Compared with the control group,the addition of yeast culture in the diet significantly increased the apparent digestibility of growing pigs(P<0.05);there was a trend of increasing metabolizable energy/total energy(P<0.10).Compared with the barley sorghum diets,the corn type diets significantly increased the daily urine output of growing pigs(P<0.05).The yeast culture added to the diet and the type of diets had no significant effect on the daily feed intake,daily fecal output,digestive energy and metabolic energy of growing pigs(P>0.05).Compared with the barley sorghum diets,the corn type diets significantly increased the p H of the growing ileum chyme(P<0.01);significantly increased the ileal chyme amylase activity(P<0.05);There is an increasing trend of the ileal chyme trypsin activity(P < 0.10).The yeast culture added to the diet and the type of diets had no significant effect on the lipase activity and viscosity of the ileum chyme of growing pigs(P>0.05).In conclusion,compared with barley sorghum diets,corn type diets can significantly increase crude protein digestibility,amino acid terminal apparent digestibility,chyme amylase activity and p H.Compared with the control group,the addition of yeast culture in the diet can increase the apparent digestibility of amino acid terminal ileum,improve the characteristics of ileal chyme,and raise the feed utilization rate.