True ileal calcium digestibility in soybean meal and canola meal, and true ileal phosphorous digestibility in maize-soybean meal and maize-canola meal diets, without and with microbial phytase, for broiler growers and finishers
| Autor: | Michael R. Bedford, Velmurugu Ravindran, M.R. Abdollahi, L. S. David |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
food.ingredient
040301 veterinary sciences Soybean meal chemistry.chemical_element Biology Calcium Zea mays 0403 veterinary science Animal science food Animals Canola 6-Phytase Meal digestive oral and skin physiology 0402 animal and dairy science Broiler food and beverages 04 agricultural and veterinary sciences General Medicine Animal Feed 040201 dairy & animal science Diet chemistry Phosphorus Dietary Animal Nutritional Physiological Phenomena Digestion Animal Science and Zoology Phytase Soybeans Chickens Food Science |
| Zdroj: | British Poultry Science. 62:293-303 |
| ISSN: | 1466-1799 0007-1668 |
| DOI: | 10.1080/00071668.2020.1849559 |
| Popis: | 1. Published data on the ileal Ca digestibility in soybean meal (SBM) and canola meal (CM), and the effect of microbial phytase on the Ca digestibility of these ingredients are limited. Therefore, two experiments were conducted, with the primary objective of determining the true ileal digestibility of calcium (Ca) in SBM and CM, without and with microbial phytase, during broiler grower (Experiment 1) and finisher (Experiment 2) periods. A secondary objective was to investigate the influence of microbial phytase on the true ileal digestibility of phosphorus (P), apparent digestibility of nitrogen (N) and minerals, and phytate disappearance in maize-SBM and maize-CM diets. Six experimental diets based on SBM and CM, with three phytase doses (0, 500 and 2000 FTU/kg), were fed to broilers from day 18 to 21 (Experiment 1) or 39 to 42 (Experiment 2) post-hatch. A Ca- and P-free diet, with no added phytase, was also developed to determine the endogenous Ca and P losses. Titanium dioxide was incorporated in all diets as an indigestible indicator. Each experimental diet was randomly allocated to six replicate cages (eight birds per cage). Apparent ileal digestibility was calculated using the indicator method and the true ileal digestibility was calculated by correcting for endogenous losses. Apparent total tract retention (ATTR) of Ca and P was also measured.2. Ileal endogenous losses of Ca and P were determined to be 236 and 310 mg/kg of dry matter intake (DMI), respectively, in broiler growers and 29 and 130 mg/kg of DMI, respectively, in broiler finishers. True ileal Ca digestibility coefficients of SBM and CM, without added phytase, were determined to be 0.51 and 0.53, respectively, in broiler growers and 0.33 and 0.22, respectively, in broiler finishers. Increasing phytase doses increased ( |
| Databáze: | OpenAIRE |
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