Effect of dehulling on digestibility and nutritive value of oat groats for dogs
Kempe, Riitta; Saastamoinen, Markku (2004)
Agrifood Research ReportsMaa-ja elintarviketalous
Myynti MTT tietopalvelut
Myynti MTT tietopalvelut
Hulls, which dilute the nutritional quality of oats, are perhaps the most important reason why oats has been replaced by other cereals, like rice, corn, wheat and barley, in the nutrition of dogs. The high crude fibre and cellulose contents of hulls have negative effects on the dry matter, organic matter, crude protein, energy and mineral digestibilities (K, Na, Cl) of cereals in dogs (Fahey et al. 1992, Lewis et al. 1994, Kienzle et al. 2001). However, when dehulled, oat groats are superior to other cereals in digestible energy value and digestible crude protein value in dogs (Kempe et al. 2004). Also the digestibility of the main nutrients of oat groats are comparable to those of rice and better than in wheat, barley or corn (Kempe et al. 2004). The efficiency of dehulling is dependent on rotation speed of the dehuller. It is important that the nutritionally valuable kernels are intact after hulling process. To determine the effect of dehulling on apparent nutrient digestibilities and feed values for dogs, oats was dehulled at three different rotation speeds: 200, 300 and 400 rpm using small laboratory dehuller. The oat groats were heat treated in a flower mill with indirect steam (160oC, 30 min). A digestibility trial was carried out in metabolism cages on eight female Alaskan huskies according to a replicated 4 × 4 Williams square design. Dehulling the oats at the rotation speed 300 rmp increased the faecal digestibility of dry matter, organic matter, crude fibre, N-free extract, crude carbohydrates and gross energy compared to low rotation speed. High rotation speed 400 rpm did not induce further increase in the nutrient digestibility, except dry matter and crude carbohydrates. Digestibility of crude protein, fat and starch were unaffected by the treatment and were an average 82%, 87% and 99%, respectively. However, the amount of digestible protein (DCP) and energy (DE) increased when dehulling level increased: 121, 134 and and 140 g DCP kg-1 DM and 15.1, 16.7 and 17.0 MJ DE kg-1 DM, respectively. Fahey et al.1992. Journal of Animal Science 70: 1169-1174; Lewis et al. 1994. Journal of Nutrition 124: 2716S-2718S; Kienzle et al. 2001. Journal of Animal Physiology and Animal Nutrition 85: 174-185; Kempe, R. et al. 2004. Agricultural and food Science in Finland (in press).
- Julkaisut