PhD studies supported by MEKARN
Dietary modulation to improve pig health and performance
Tran Thi Thu Hong
Hue University of Agriculture and Forestry
The aim of this thesis was to estimate the presence of Salmonella and enterotoxigenic Escherichia coli in piglets, the effect of fermented liquid feed and rice distiller’s residue as a dietary modulation of the microbial population, the presence of microflora at different sites of the digestive tract, digestibility, and to evaluate the performance of pigs under small-scale farm conditions. The first experiment showed that Salmonella and E.coli were found in faeces from piglets without and with diarrhoea. All E. coli antigens were isolated from piglets without and with diarrhoea. However, the frequency of antigen was much higher in piglets suffering from diarrhoea. Nutrient supply for sows and for piglets was low in comparison with feeding standards. In the second experiment, there were no differences in pH and butyric acid concentration of ileal digesta in pigs fed raw (R), cooked (C) or naturally fermented (F) diets. However, on diet F concentrations of acetic, lactic and propionic acid in ileal digesta were higher than on diets R and C. The ileal apparent digestibility of crude protein, crude fiber and NDF were higher in diet F than in diets R and C. The total tract apparent digestibility of crude protein was higher in diet F than in diets R and C. In conclusion, when compared with the diet in raw form, fermentation influenced the gut environment and improved the digestibility of some dietary components, while cooking prior to feeding had no measurable effects. In the third trial, a naturally fermental diet (FE) resulted in a lower pH than a diet basal on rice distiller’s residue (RDR). Diet FE contained more organic acids, and had the lowest counts of E. coli and total coliforms, and the highest counts of lactic acid bacteria (LAB). Piglets fed diets FE and RDR had lower pH, and higher concentrations of organic acids in the stomach, ileum and mid-colon than piglets fed diet CO. Counts of LAB in stomach and ileum were higher in animals fed diets FE and RDR compared with diet CO, while the number of E. coli and total coliforms along the gastrointestinal tract was reduced. The ileal digestibility of crude protein and organic matter was improved in piglets fed diet RDR compared with piglets fed diet CO. Piglets fed diet RDR had a higher weight gain and a better feed utilization than piglets fed the other diets. In the final experiment DGGE analysis showed that animals fed diet FE had a much more uniform microbial flora in the stomach and the ileum compared to the other diets. Strains belonging to the genus Pediococcus were found in stomach and ileum of piglets fed diet FE and not on the other diets which probably arose from the feed.

MeKarn PhD Graduation

Le Van An, Hue University of Agriculture and Fores Sweet potato leaves for growing pigs: biomass yield, digestion and nutritive value
Nguyen Thi Kim Dong: Can Tho University Studies on the utilization of agro-industrial by-products as protein sources for ducks in the Mekong Delta of Vietnam
Do Viet Minh Effect of supplementation of scavenging chickens on feed and nutrient intake, digestibility and performance of local and improved breeds in Vietnam
Khieu Borin Cassava foliage for monogastric animals; forage yield, digestion, influence on gut development and nutritive value
Duong Nguyen Khang Cassava leaf as a protein source for cattle in Vietnam
Do Thi Thanh Van Some animal and feed factors affecting feed intake, behaviour and performance of small ruminants
Vanthong Phengvichith Feeding and forage management systems for smallholder goat productionImproving feed intake of sugarcane and foliage in small ruminants: effect of processing and method of presentation of the feed
Ninh Thi Len Evaluation of high fibre feeds for growing pigs in Vietnam
Nguyen Quang Thieu Evaluation of mycotoxin contamination in Vietnam
Tran Thi Thu Hong Dietary modulation of gut microflora to improve pig health and food safety
Seng Sokerya Effects of cassava foliage on nematode infestation in goats in Cambodia
Huang Huong Giang: Probiotics for Piglets: Effects of probiotics on growth rate, digestibility, health status and features of intestinal microflora of exotic piglets post-weaning under the conditions of Northern Vietnam
Nguyen Thi Thuy Evaluation of Catfish by-product as a protein source for pigs in the Mekong Delta of Vietnam
Chu Manh Thang: Beef production based on cassava products and legume foliage in Vietnam
Nguyen Duy Quynh Tram Evaluation of locally available feed resources for small-scale freshwater fish production in Central Vietnam
Total records: 29