PT  - JOURNAL ARTICLE
AU  - Liege Teixeira
AU  - Caroline Fredrich Dourado Pinto
AU  - Alexandre de Mello Kessler
AU  - Luciano Trevizan
TI  - Effect of partial substitution of rice with sorghum and inclusion of hydrolyzable tannins on digestibility and postprandial glycemia in adult dogs
AID  - 10.1101/482083
DP  - 2018 Jan 01
TA  - bioRxiv
PG  - 482083
4099  - http://biorxiv.org/content/early/2018/11/28/482083.short
4100  - http://biorxiv.org/content/early/2018/11/28/482083.full
AB  - Sorghum is used as a substitute of rice in dog food, owing to its nutritional similarity and low cost. However, its use has been associated with negative effects, like a reduction in palatability, digestibility, and enzyme activity, which can decrease nutrient absorption. The presence of condensed tannins (CT) in sorghum may cause these effects. Another tannin group, the hydrolysable tannins (HT), is known for its antioxidant properties. Research has shown the nutritional effects of sorghum on dogs, but the effect of HT on dogs remains unknown. We evaluated the effects of substituting rice with sorghum containing CT and inclusion of commercial extract of HT on digestibility, fecal and urinary characteristics, and postprandial blood glucose levels in adult dogs. Nine adult Beagle were randomly subjected to 4 treatments: 50% rice; (RS) 25% rice + 25% sorghum; (RHT) 50% rice + 0.10% HT; (RSHT) 25% rice + 25% sorghum + 0,10% HT. Tannins did not affect food intake. The digestibility of dry matter, organic matter, crude protein, acid hydrolyzed fat, gross energy, and metabolizable energy (ME) decreased with sorghum inclusion (P < 0.05). Sorghum also decreased protein digestibility (P < 0.05). Greater fecal dry matter was observed with the RHT diet. HT associated with sorghum reduced ME (P < 0.05). Sorghum inclusion enhanced fecal output, without altering fecal score (P > 0.05). No alterations in urinary characteristics were observed. Sorghum and HT did not affect the postprandial blood glucose response measured by the area under the curve (P > 0.05). The substitution of rice by sorghum negatively affected protein absorption and ME of the diets. Sorghum can be considered as a good source of carbohydrates in therapeutic diets for weight control. HT may potentiate the effect of CT, but more research is needed to evaluate its potential use in dog nutrition.