News 364 views last update:6 Aug 2012

Effect yeast and MOS tested in pigs

The Animal Sciences Group from Wageningen University carried out an experiment to determine the effects of yeast culture (XPCLS) and yeast culture XPCLS + mannan oligosaccharide (MOS) in pig diets on the performance, gut integrity, and immune function in weanling pigs. The researchers also wanted to determine whether these dietary supplements can replace antimicrobial growth promoters (AGP) in pig diets.

A total of 480 weanling pigs (27-d old and 7.8 ± 0.1 kg) were assigned to one of four experimental treatments:
1) diets without AGP and without yeast culture (control diet);
2) diets with AGP but no yeast culture;
3) diets without AGP but with 0.125% yeast culture;
4) diets without AGP but with 0.125% yeast culture + 0.2% MOS.

From day 1 to 35 post-weaning, average daily gain tended to be lower and feed conversion ratio was lower in piglets that were fed the control diet compared to piglets that were fed the other diets. Average daily feed intake was not affected by dietary treatment. Performance was similar in piglets that were fed diets supplemented with AGP, yeast culture, and yeast culture + MOS.

Gut integrity
Villous length, crypt depth, and microbial composition in the gut were not affected by dietary treatment. Blood cell composition, villous length, crypt depth, and microbial composition, however, were affected by time after weaning. Red blood cells, haemoglobin, haematocrite value, mean cell volume, mean cell haemoglobin, percentage of lymphocytes in the leucocyte (white blood cell) population, villous length, and crypt depth were greater at five weeks post-weaning than at two weeks post- weaning.

More insights needed
The results from this study suggest that yeast culture could be an alternative to AGP in diets for weanling pigs. The addition of MOS to diets containing yeast culture would not improve performance and immunity of weanling pigs above that of yeast culture alone. The researchers say that more insight into the mode of action is needed.

Related link:
The full report (in Dutch)

Related website:
Animal Sciences Group

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