Effect of a novel consensus bacterial 6-phytase variant in grower pigs fed corn-soybean meal-based diets formulated with a full nutrient matrix and no added inorganic phosphorus
| Autor: | Yueming Dersjant-Li, Leon Marchal, Marta Isabel Gracia, O Casabuena Rincon, Deepak E Velayudhan |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Consensus
Swine 030309 nutrition & dietetics Soybean meal Positive control chemistry.chemical_element Non Ruminant Nutrition Zea mays Feed conversion ratio Matrix (chemical analysis) 03 medical and health sciences Animal science Nutrient Genetics Animals Inorganic phosphorus 6-Phytase 0303 health sciences Chemistry Phosphorus 0402 animal and dairy science Nutrients 04 agricultural and veterinary sciences General Medicine Animal Feed 040201 dairy & animal science Diet Dietary Supplements Animal Nutritional Physiological Phenomena Digestion Animal Science and Zoology Phytase Soybeans Food Science |
| Zdroj: | J Anim Sci |
| ISSN: | 1525-3163 0021-8812 |
| DOI: | 10.1093/jas/skab176 |
| Popis: | The capacity of a novel consensus bacterial 6-phytase variant (PhyG) to entirely replace dietary inorganic phosphorus (Pi) source in grower pigs fed diets with reduction of calcium (Ca), net energy (NE), and digestible amino acids (AA) was evaluated, using growth performance and apparent total tract digestibility (ATTD) of nutrients as outcome measures. A total of 352 mixed-sex pigs (initial BW 23.4 kg) were randomized to 4 treatments, 8 pigs/pen, and 11 pens/treatment. Diets were corn-soybean meal-based and formulated by phase (grower 1, 25 to 50 and grower 2, 50 to 75 kg BW). The positive control diet (PC) provided adequate nutrients and a negative control diet (NC) was formulated without Pi (1.2 g/kg ATTD P) and reduced in Ca (-0.12 to -0.13 percentage points), NE (-32 kcal/kg), and digestible essential AA (-0.004 to -0.026 percentage points) vs. PC. Two further treatments comprised the NC plus 500 or 1,000 FTU/kg of PhyG. Data were analyzed by ANOVA, mean contrasts and orthogonal polynomial regression. Nutrient reductions in the NC reduced (P < 0.05) average daily gain (ADG) during grower 1 and overall (73 to 136 d of age), increased (P < 0.05) feed conversion ratio (FCR) during grower 1 and overall and tended to reduce (P < 0.1) average daily feed intake (ADFI) during grower 2 and overall, vs. PC. Phytase supplementation improved (P < 0.05) FCR during grower 1, ADG during grower 2 and overall, ATTD of DM and P, and tended to improve DE (P = 0.053) in a linear dose-dependent manner. PhyG at 1,000 FTU/kg resulted in growth performance (all measures, all phases) equivalent to PC. The findings demonstrate that PhyG at 1,000 FTU/kg totally replaced Pi in complex grower pig diets containing industrial co-products, compensated a full nutrient matrix reduction and maintained performance. |
| Databáze: | OpenAIRE |
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