| Autor: |
McCafferty KW; School of Environmental and Rural Sciences, University of New England, Armidale, Australia., Toghyani M; Poultry Research Foundation, The University of Sydney, Camden, Australia., Morgan NK; School of Environmental and Rural Sciences, University of New England, Armidale, Australia., Cowieson AJ; DSM Nutritional Products, Kaiseraugst, Switzerland., Choct M; School of Environmental and Rural Sciences, University of New England, Armidale, Australia., Moss AF; School of Environmental and Rural Sciences, University of New England, Armidale, Australia. |
| Jazyk: |
angličtina |
| Zdroj: |
British poultry science [Br Poult Sci] 2022 Jun; Vol. 63 (3), pp. 386-394. Date of Electronic Publication: 2021 Oct 15. |
| DOI: |
10.1080/00071668.2021.1975260 |
| Abstrakt: |
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.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.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.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.5. Thus, protease supplementation and diet type can affect digestive dynamics and nutrient utilisation in broilers. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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