Efficacy of β-mannanase on broiler growth performance and energy utilization in the presence of increasing dietary galactomannan
| Autor: | H G Walters, M. P. Williams, B Carter, R. E. Latham, Jongmin Lee |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
Male Soybean meal Randomized block design Mannans 03 medical and health sciences Galactomannan chemistry.chemical_compound Random Allocation Starter Animal science Ileum Beta-Mannanase Animals Guar gum Dose-Response Relationship Drug Chemistry Viscosity 0402 animal and dairy science Broiler beta-Mannosidase Galactose 04 agricultural and veterinary sciences General Medicine 040201 dairy & animal science Animal Feed Diet Intestines 030104 developmental biology Dietary Supplements Animal Science and Zoology Animal Nutritional Physiological Phenomena Digestion Energy Metabolism β mannanase Chickens |
| Zdroj: | Poultry science. 97(2) |
| ISSN: | 1525-3171 |
| Popis: | An experiment was conducted to investigate the impact of β-mannanase inclusion on growth performance, viscosity, and energy utilization in broilers fed diets varying in galactomannan (GM) concentrations. Treatments were arranged as a 3 (GM concentration) × 3 (β-mannanase inclusion) factorial randomized complete block design with 12 replicates of 29 male broilers per replicate for a 42-d experiment. Efforts were made to reduce the amount of soybean meal, and thus GM, in the basal diet with guar gum included at 0, 0.21, or 0.42% to achieve a GM supplementation of 1,500 and 3,000 ppm, respectively. Beta-mannanase was included at 0, 200, or 400 g/ton. Broilers were fed a starter (d 0 to 14), grower (d 15 to 28), and finisher diets (d 29 to 42). Growth performance was monitored and ileal contents collected on d 14, 28, and 42 to determine ileal digestible energy (IDE) and intestinal viscosity. Increasing levels of GM negatively (P 0.05) influenced body weight (BW) following the starter and grower periods and increased (P 0.01) mortality corrected feed conversion ratio (FCR) throughout the study. Reduced growth performance was associated with increased (P 0.05) intestinal viscosity and decreased (P 0.05) IDE when GM inclusion was increased. Inclusion of β-mannanase in diets containing supplemental GM on d 28, increased average BW to levels similar to diets without supplemental GM. Improvements in FCR were also observed with β-mannanase inclusion in diets containing supplemental GM. Ileal digestible energy was increased (P 0.05) with the addition of β-mannanase on d 28 of age. Multiple interactions in growth performance, intestinal viscosity, and IDE were associated with β-mannanase administration. In conclusion, β-mannanase improved IDE, reduced intestinal viscosity, and improved growth performance; however, the observed benefit was dependent upon dietary GM concentration. |
| Databáze: | OpenAIRE |
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