Abstract
The effects of feed processing on the apparent ileal digestibility of amino acid and the utilisation of nitrogen (N) in diets containing wheat by-products were studied in five castrated male pigs (live weight 40-109 kg). A T-cannula was surgically fitted into the caecum of the pigs at a live weight of 27 kg using the steered ileo-caecal valve technique. The experiment was conducted with a 6 x 5 cyclic change-over design in which six diets were arranged 2x3 factorially. The corresponding factors were type of wheat by-product in the diets: wheat bran (152 g/kg) or wheat middlings (328 g/kg), and method of feed processing: steam pelleting, expanding or extrusion. The other dietary feed ingredients were barley and soya bean meal. The feed-processing method or dietary wheat by-product had no effect on the apparent ileal digestibility of amino acids and crude protein. The pigs on diets containing wheat middlings tended to retain more N per intake (p
Highlights
The effecls of feed processing on the apparent ileal digestibility of amino acid and the utilisation of nitrogen (N) in diets containing wheat by-products were studied in five castrated male pigs
Pressurized hydrothermal feed processing methods such as pelleting, expanding and extrusion are commonly used in the feed industry to improve the nutritive value and hygienic quality of feed ingredients or compounds
The purpose of this study was to compare the effects of pelleting, expanding or extrusion on the apparent ileal digestibility of protein and amino acids in diets containing either wheat bran or wheat middlings
Summary
The effecls of feed processing on the apparent ileal digestibility of amino acid and the utilisation of nitrogen (N) in diets containing wheat by-products were studied in five castrated male pigs (live weight 40-109 kg). The corresponding factors were type of wheat by-product in the diets: wheat bran (152 g/kg) or wheat middlings (328 g/kg), and method of feed processing: steam pelleting, expanding or extrusion. The feed-processing method or dietary wheat by-product had no effect on the apparent ileal digestibility of amino acids and crude protein. Feed processing at a moderate temperature or wheat by-product in the diets had no influence on the apparent ileal digestibility of amino acids. Dietary inclusion of fibre-rich wheat bran has decreased the feed retention time from mouth to anus and depressed the digestibility of nutrients including protein (Stanogias and Pearce 1985)
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