The Effect of Level of Wheat Inclusion in Diets for Growing and Finishing Pigs on Performance, Nutrient Digestibility and Gastric Ulceration

  • Ball, M.E.E. ;
  • Magowan, E.
  • Received : 2010.07.08
  • Accepted : 2010.10.02
  • Published : 2012.07.01


Four experimental diets were formulated to contain 700 g/kg cereal with decreasing levels of wheat:barley inclusion. Diet 1 contained 700 g/kg wheat, diet 2 contained 600 g/kg wheat and 100 g/kg barley, diet 3 contained 500 g/kg wheat and 200 g/kg barley and diet 4 contained 400 g/kg wheat and 300 g/kg barley. The diets were offered to pigs on three trials to investigate effects on the performance of individually (n = 72) and group housed (n = 480) pigs and on nutrient digestibility in pigs housed in metabolizm crates (n = 24). Performance was assessed from 10 wks of age until slaughter and carcass characteristics were measured. For the group performance study, one pig from each pen (in total 24) at 10, 15 wks and at finish were slaughtered to ascertain scores for stomach ulceration, stomach weights and intestinal length. Level of wheat inclusion did not significantly (p>0.05) affect liveweight gain (LWG) or feed conversion ratio (FCR). Feed intake was lowest (p<0.05) for individually housed pigs offered diets containing 700 g/kg wheat during the 10-15 wk period, which indicated that individually housed pigs attempted to eat to a constant energy intake. There was little evidence of stomach ulceration across treatments and increasing wheat inclusion had no detrimental effect. Higher levels of wheat inclusion tended to increase backfat depth at the $P_2$ position which could lead to increasing grading penalties in a commercial situation although more research is required in this area. Increasing level of wheat inclusion increased digestible energy (DE) content but the lack of effect on FCR and killing out percentage indicated that utilization of energy from barley and wheat was similar. Digestibility coefficients increased linearly with increasing wheat content, which can be attributed to the lower level of fibre and higher level of starch in wheat compared with barley.




  1. Association of Official Analytical Chemists, 1990. Official Methods of Analysis of the Association of Official Analytical Chemists, 15th Edition. AOAC Press, Gaithersburg, USA.
  2. Bach Knudsen, K. E. 1997. Carbohydrate and lignin contents of plant materials used in animal feeding. Anim. Feed Sci. Technol. 67:319-338.
  3. Chae, B. J., I. K. Han, J. H. Kim, C. J. Yang, S. J. Ohh, Y. C. Rhee and Y. K. Chung. 1997. Effects of feed processing and feeding methods on growth and carcass traits for growing-finishing pigs. Asian-Aust. J. Anim. Sci. 10:164-169.
  4. Cole, D. J. A., B. Hardy and D. Lewis. 1972. In: Pig Production (Ed. D. J. A. Cole), pp. 243-257. London, Butterworths.
  5. Hanrahan, T. J. and J. F. O'Grady. 1984. Wheat as an ingredient in pig feeds. Ir. J. Agric. Res. 23:117-125.
  6. Johansen, H. N., K. E. Bach Knudsen, B. Sandstrom and F. Skjoth. 1996. Effects of varying content of soluble fibre from wheat flour and oat milling fractions on gastric emptying in pigs. Br. J. Nutr. 75:339-351.
  7. Morel, P. and Y. H. Cottam. 2007. Effects of particle size of barley on intestinal morphology, growth performance and nutrient digestibility in pigs. Asian-Aust. J. Anim. Sci. 20:1738-1745.
  8. Nielsen, E. K. and K. L. Ingvartsen. 2000. Effect of cereal type, disintegration method and pelleting on stomach content, weight and ulcers and performance in growing pigs. Livest. Prod. Sci. 66:271-282.
  9. Official Journal of the European Communities, 1998. L257, 19/09/1998, p. 14.
  10. Potkins, Z. V., T. L. J. Lawrence and J. R. Thomlinson. 1989. Oesphagogastric parakeratosis in the growing pigs: Effects of the physical form of barley-based diets and added fibre. Res. Vet. Sci. 47:60-67.
  11. Smith, W. J. and S. A. Edwards. 1996. Ulceration of the pars oesophagea - the role of a factor in wheat. The Pig - J. Proc. Section, 36:194-200.
  12. United States Department of Agriculture (USDA) 2008. Grain: World Markets and Trade. United States Department of Agriculture, Foreign Agricultural Service - Circular Series FG0508, May 2008.
  13. Van Barneveld, R. J. 1999. Chemical and physical characteristics of grains related to variability in energy and amino acid availability in pigs: a Review. Aust. J. Agric. Res. 50:667-687.
  14. Weatherup, R. N., V. E. Beattie, K. J. McCracken, R. W. Henry, S. G. McIlroy and S. Smyth. 2002. The effects of energy and lysine concentrations in grower diets for pigs on performance from 8 to 12 weeks of age. Ir. J. Agric. Food Res. 41:95-104.
  15. Wonda, K. J., J. D. Hancock, K. C. Behnke, G. H. Kennedy and R. H. Hines. 1992. In: Kansas State University Swine Day Report of Progress 667 (Eds B. Goodband and M. Tokach), pp. 127-130. Kansas, USA.