Regulation Of Different Inorganic Phosphorus Source On Growth Performance, Intestinal Morphology Structure And Intestinal Steady State Of Weaned Piglets

This study was conducted to explore different inorganic phosphorus sources regulation of piglet on growth performance, intestinal morphology and the mechanism of action of intestinal homeostasis. The test results would provide a theoretical basis for the applications of different inorganic phosphorus in the piglets feed.Experiment I: Effect of different inorganic phosphorus source on growth performance of weaned pigletsThis experiment was conducted to study the effect of different inorganic phosphorus sources regulation of weaned piglets on growth performance while keeping other factors such as dietary energy, protein, calcium phosphorus unchanged. Two hundred weaned piglets(28±2 days old) with similar genetic background and good health status(8.41±0.97 kg of BW), and they(half males and half females) were randomly divided into 5treatments with 4 replicates of 10 piglets per repeat. The piglets were fed 0.66% DCP powdered, 0.49% MDCP granular, 0.49% MDCP powdered, 0.44% MCP granular or0.44% MCP powdery five kinds of inorganic phosphorus with the same level of calcium and phosphorus levels diet five groups, respectively.The results showed that:(1) MDCP granular, MDCP powdery, MCP granular and MCP powdery inorganic phosphorus source of acid-binding than DCP powdery inorganic phosphorus source of acid-binding decreased significantly(P<0.05), add the MCP powdery diet is the acid-binding the lowest(P<0.05).(2) 42 ~ 56 days of age stage, MCP powdery average daily gain is larger than that of DCP powdered group increased significantly(P<0.05), MDCP granular and MCP powdery were significantly Lower than DCP powdery group F/G(P<0.05).(3) The test indicated that the MCP granular diarrhea ratio decreased significantly than DCP powdery group(P<0.05). The experimental data show that, the weaning diets MCP powdery inorganic phosphate group can promote growth performance of piglets.Experiment II: Effect of different inorganic phosphorus source on apparent nutrient digestibility and calcium and phosphorus metabolism of weaned pigletsThis experiment was mainly research while keeping dietary energy, protein, calcium and other rates unchanged, the effect of different inorganic phosphorus sources regulation of weaned piglets on apparent nutrient digestibility and calcium and phosphorus metabolism. Grouping and diets are as same as Experiment I. The results show that:(1)The apparent nutrient digestibility calcium of DCP powdery group is the highest(P<0.05).(2) The ALP of MCP powderey group is the minimum(P>0.05).(3)There was no significantly different in content of coffin bone weight, coffin bone ash weight, coffin bone ratio and phosphorus among each treatment(P>0.05). However, MDCP powdery,MCP powderey and MCP granular hoof calcium content higher than DCP powdery group(P<0.05). Integrated data display, MCP powderey dietary supplement inorganic phosphorus groups is better improve the metabolism of the piglet calcium, phosphorus, but no significant difference with MDCP powdered.Experiment III: Effect of different inorganic phosphorus source on intestinal microbiology of weaned pigletsThis experiment was mainly research while keeping dietary energy, protein, calcium and other rates unchanged, the effect of different inorganic phosphorus sources regulation of weaned piglets on intestinal microbiology. Grouping and diets are as same as Experiment I. The results show that:(1) MDCP granular, MCP granular and MCP powdery groups were significantly Lower than DCP powdery group pH value of duodenum(P<0.05).(2) Among the MDCP powdery, MCP granular and MCP powdered acetate content were little difference, but the differences are compared with the both DCP powdered and MDCP granular acetate content was significantly(P<0.01). MDCP powdery,MCP granular and MCP powdered group significantly increased propionate content than the DCP powdery group(P<0.05).(3) The Jejunum containing total butyrate between different inorganic phosphorus source significant difference(P<0.01),The Escherichia coli of MDCP granular was significantly lower than the MCP granular(P<0.05), but with the DCP powdery, MDCP powderey and MCP powderey difference was not significant(P>0.05), and Lactobacillus and Bifidobacterium of MDCP granular was the highest(P<0.05).(4) Data showed that the number of the lactobacilli and bifid bacteria of MDCP powderey was the lowest,and the number of lactobacilli and bifidobacteria of differentinorganic phosphorus source were not significantly difference(P>0.05). In summary,MDCP powdered, MDCP granular and MCP powdery dietary supplement inorganic phosphorus groups to the better promote intestinal microbiology of weaned piglets.Experiment IV: Effect of different inorganic phosphorus source on intestinal morphology of weaned pigletsThis experiment was mainly research while keeping dietary energy, protein, calcium and other rates unchanged, the effect of different inorganic phosphorus sources regulation of weaned piglets on Intestinal morphology. Grouping and diets are as same as Experiment I. The results show that:(1) Jejunum villus length of MCP powdery group is significant higher than DCP powdery group(P<0.05).(2) TEM of 5000 times found that jejunum microvilli of the DCP powdery group was relatively sparse, vague and the phenomenon of loss and damage; jejunum microvilli of the MDCP and MCP inorganic phosphorus source were neat and dense, and the length was also increased, especially in the jejunum microvilli of the MCP powdery was the best compared to the other groups. Comprehensive test data show that MDCP granular, MDCP powdery, MCP granular and MCP powdery were better than DCP powdery to promote the villus length. MCP powdery is the best supplement to inorganic phosphorus groups on intestinal morphology of weaned piglets.