Satiating properties of diets rich in dietary fibre fed to sows as evaluated by physico-chemical properties, gastric emptying rate and physical activity

The use of ingredients with high DF content in sow diets may reduce the physical activity of the sow.

The purpose of the present study was to evaluate and rank different DF sources for their physico-chemical properties and on the stomach emptying rate related to physical activity. Therefore the study was carried out using 4 diets to evaluate satiating properties of sow diets: a barley/wheat control diet (Con) and three diets with added dietary fibre (DF) from potato pulp (PP), sugar beet pulp (SBP) and pectin residue (PR). Diets PP and SBP were characterized by having a high content of soluble DF, whereas PR was characterized by a high content of insoluble DF. Swelling and water binding capacity were highest in PP, followed by SBP, PR and lowest in the Con diet. Four dry sows were used in a 4×4 Latin Square design and gastric emptying parameters as lag phase and gastric emptying half time was measured using 13C-acetate as marker for the liquid phase and 13C-octanoic acid as marker for the solid phase. The sows were placed inside a respiration chamber and 13C-carbondioxide was measured in the expired air. The animal activity was measured as relative total activity to overall mean activity by the activity sensor and standing/laying by the photocell when the sows stayed in the respiration chamber.

Both measures of activity was reduced when sows were fed potato pulp and sugar beet pulp compared to pectin residue and barley/wheatcontrol diets (P=0.001), which suggest that high fibre soluble diets is superior in improving satiety of sows as compared to the high fibre insoluble diet and the low fibre control diet. Increased time to reach Tlag and T50 indicate delayed gastric emptying. The liquid phase emptying measured by the 13C-acetic acid was characterized by a low gastric emptying rate (high T50 and Tlag) in potato pulp, intermediate in sugar beet pulp and high emptying rate in sows fed pectin residue and control diets (low T50 and Tlag) (P=0.022). This ranking of diets agrees well with that observed for WBC and swelling and activity measures.

Feeding diets rich in soluble DF reduce the physical activity of sows and these satiating properties could be attributed to increased swelling and WBC in the stomach, which in turn delayed the gastric emptying rate of the liquid phase of gastric content. Measurements of gastric emptying turned out to be a practical tool for ranking of the ability of DF sources to reduce activity in sows.

H Jørgensen, PK. Theil, KE Bach Knudsen, 2010. Livestock Science, 134:37-40.

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Satiating properties of diets rich in dietary fibre fed to sows as evaluated by physico-chemical properties, gastric emptying rate and physical activity

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