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This study was conducted to evaluate the effects of dietary supplementation of protected organic acid blends on growth performance, nutrient digestibility and faecal micro flora in growing pigs. A total of 100 crossed [(Landrace × Yorkshire) × Duroc] with an initial body weight (BW) of 23.4 ± 1.27 kg were used in a six-week trial. Pigs were randomly allocated into one of four treatments (five replications with five pigs per pen) in a randomly complete block design based on their BW. Treatments consisted of CON, basal diet; MC1, basal diet + protected organic acid 0.1%; MC2, basal diet + protected organic acid 0.2%; MC3, basal diet + protected organic acid 0.4%. BW and feed intake were measured initially and at the end of six weeks to determine average daily gain (ADG), average daily feed intake (ADFI) and gain/feed. The digestibility of nutrients and faecal micro flora was also assessed at the end of the experiment. The pigs fed MC2 diet showed greater ADG and G:F than pigs fed the control diet. Linear effects for ADG (linear, P = 0.04) as well as G: F (linear, P = 0.03) were observed. Dietary supplementation with 0.1%, 0.2% and 0.4% protected organic acid did not affect dry matter, N and energy digestibility. Supplementation of 0.2% protected organic acid increased (P < 0.05) faecal Lactobacillus population counts (linear, P = 0.01). Our result suggests that protected organic acid has the potential to enhance growth performance and improve microbial population in growing pigs.

-The objective of the present study was to evaluate the effects of blends of dietary protected organic acid supplementation on growth performance, nutrient digestibility, blood profiles, faecal microflora, and gas emission on sows and piglets with emphasis on their modes of action to improve pig performance. A total of 12 sows with an average initial body weight (BW) of 252.40±11.7 kg were used in this trial. Growth performance, blood profiles, and nutrient digestibility of sows and piglets fed protected organic acid were evaluated. The dietary treatments included a basal diet (CON); CON + 0.1% protected organic acid; and CON + 0.2% protected organic acid. The BW and back fat of sows was checked four days prior to farrowing and at the weaning day to calculate BW loss and back fat loss during that period. Inclusion of 0.2% protected organic acid provided a greater digestibility than CON diets throughout the experimental period in lactating sows. Dietary supplementation with 0.2% protected organic acid led to a higher white blood cell and lymphocyte concentration than CON treatment in sucking piglets. Immunoglobulin G concentration observed was greater in protected organic acid groups in lactating sow and sucking piglets. Increased faecal Lactobacillus counts with decreased E. coli concentrations were observed with the diets of protected organic acid fed to lactating sows. The E. coli counts were decreased in weaning piglets. The faecal H 2 S contents were decreased in 0.2% protected organic acid diets during farrowing on day 1. Dietary supplementation with protected organic acid blends beneficially affects the nutrient digestibility, ileal noxious gas (NH 3 and H 2 S) emission, as well as intestinal microbial balance in lactating sows.

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Combined IgY-PVH effectively control ETEC, therefore holds a great potential for microbial control in veterinary pharmaceutical industry.

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