Author(s) |
Mccafferty, K W
Toghyani, M
Morgan, N K
Cowieson, A J
Choct, M
Moss, A F
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Publication Date |
2022
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Abstract |
<p>1. A study was conducted to assess the effects of supplemental protease (0 or 15,000 units/kg) and diet type (maize- or wheat-based) on apparent jejunal and ileal digestibility and apparent total tract metabolisability of nutrients in Cobb 500 mixed-sex broilers from 6 to 31 d of age.</p> <p>2. Birds were randomly distributed into 56 metabolism cages (6 birds/cage" 14 replicates/treatment). At 22 d of age, jejunal and ileal digesta contents were collected and pooled from 4 birds/cage to determine apparent digestibility coefficients (DC) and digestible energy (DE). Feed intake was measured, and total excreta were collected from 8 to 11 and 18 to 21 d of age to determine apparent metabolisable energy (AME) and total tract nitrogen and starch metabolisability coefficients.</p> <p>3. Broilers offered the maize-based diet with protease had greater (P < 0.05) jejunal nitrogen DC, starch DC, and DE (8.2, 6.5, and 14.9%, respectively) and ileal nitrogen DC and DE (5.1 and 6.8%, respectively) than those offered the maize-based diet without protease. Ileal starch DC was increased (P < 0.05) by 1.1% with protease supplementation.</p> <p>4. Broilers offered maize-based diets had greater (P < 0.05) nitrogen (7.3%) and starch (0.6%) metabolisability coefficients and AME (4.7%) from 8 to 11 d of age, and nitrogen (4.3%) metabolisability coefficients and AME (2.0%) from 18 to 21 d of age compared with those offered wheat-based diets.</p> <p>5. Thus, protease supplementation and diet type can affect digestive dynamics and nutrient utilisation in broilers.</p>
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Citation |
British Poultry Science, 63(3), p. 386-394
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ISSN |
1466-1799
0007-1668
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Link | |
Publisher |
Taylor & Francis
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Title |
Effects of protease supplementation and diet type on jejunal and ileal digestibility and total tract metabolisability of nitrogen, starch, and energy in broilers
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Type of document |
Journal Article
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Entity Type |
Publication
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