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Research Abstract


Effects of coextrustion of flaxseed and field peas on the digestibility of energy, ether extract, fatty acids, protein, and amino acids in grower-finisher pigs

Authors :

J.K. Htoo, X. Meng, J.F. Patience, M.E.R. Dugan, and R.T. Zijlstra

Purpose :

To determine the ileal and total tract digestibility of individual fatty acids, ether extract, energy, protein, and amino acids in a mix of flax and field peas and to determine whether extrusion improves the nutritive value of this mix.

Methodology :

  • A 50:50 mix of flax and field peas was divided and processed in 4 different ways:
    1. Ground through a knife mill, non-extruded
    2. Extruded using a single-screw extruder with minimal water input
    3. Extruded using a twin-screw extruder at low intensity
    4. Extruded using a twin-screw extruder at high intensity
  • The basal and flax/field pea diets were based on wheat and soybean meal. The 4 experimental diets included one of the flax/field pea mixtures at 30% of the basal diet.
  • T-cannulas were fitted to the distal ileum of the barrows. These contents were used for a 2-day collection of the ileal digesta. This, along with a 2-day collection of feces was used to analyze DM, ether extract, ash, and amino acids.

Results :

  • Extrusion increased the ATTD of GE, ether extract and the DE content of the flax/field pea blend, and the AID of certain amino acids.
  • Extrusion also tended to increase the AID of linolenic acid.
  • Extrusion did not affect the apparent total tract digestibility, and apparent ileal digestibility of DM, OM, and CP for grower finisher pigs.

Conclusion :

  • LinPRO, which is produced by single screw extrusion, resulted in a trend for greater AID of linolenic acid and total fatty acids as compared to other methods of extrusion.
  • Extrusion of the flax/field pea blend improved the digestibility of ether extract, energy, amino acids, and some fatty acids and thereby increased the content of DE and Omega-3 fatty acids.