Effects of a novel consensus bacterial 6-phytase variant on the apparent ileal digestibility of amino acids, total tract phosphorus retention, and tibia ash in young broilers

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dc.citation.issue2
dc.citation.volume100
dc.contributor.authorDersjant-Li Y
dc.contributor.authorAbdollahi MR
dc.contributor.authorBello A
dc.contributor.authorWaller K
dc.contributor.authorMarchal L
dc.contributor.authorRavindran V
dc.coverage.spatialUnited States
dc.date.accessioned2023-12-14T00:14:58Z
dc.date.accessioned2024-07-25T06:34:14Z
dc.date.available2023-12-14T00:14:58Z
dc.date.available2024-07-25T06:34:14Z
dc.date.issued2022-02-01
dc.description.abstractThe effect of a novel consensus bacterial 6-phytase variant (PhyG) on apparent ileal digestibility (AID) of amino acids (AA) and phosphorus (P) utilization in young broilers when added to diets with high phytate-P (PP) content without added inorganic phosphate (Pi) and deficient in digestible (dig) AA and metabolizable energy (ME) was investigated. A total of 256 Ross 308 male broilers were assigned to 4 treatments (8 birds/cage, 8 cages/treatment) in a completely randomized design. Treatments comprised a positive control (PC, 2,975 kcal/kg ME, 3.7 g/kg dig P, 2.83 g/kg PP, 8.4 g/kg Ca, 10.6 g/kg dig lysine), a negative control (NC) without added Pi (ME −68 kcal/kg, crude protein −10 g/kg, dig AA −0.1 to −0.4 g/kg, Ca −2.0 g/kg, dig P −2.2 g/kg, Na −0.4 g/kg vs. PC), and NC plus 500 or 1,000 FTU/kg of PhyG. Test diets were corn/soy/rapeseed-meal/rice-bran-based and fed from 5 to 15 d of age. Ileal digesta and tibias were collected on day 15. Excreta was collected during days 12 to 15 to determine P retention. The NC (vs. PC) reduced (P < 0.05) P retention (−10.4% units), tibia ash (−14.3% units), weight gain (−109 g), feed intake (−82 g) and increased FCR (from 1.199 to 1.504), confirming that the NC was extremely deficient in nutrients and energy. Phytase addition to the NC linearly (P < 0.001) improved performance, but did not fully recover it to the level of the PC due to the severe nutrients/energy reduction in NC. Phytase linearly increased P retention (P < 0.001), tibia ash (P < 0.001), AID of dry matter (P < 0.05), nitrogen (P < 0.01), gross energy (P < 0.05), and all 17 individual AA (P < 0.01). At 1,000 FTU/kg, phytase increased (P < 0.05) P retention vs. PC and NC (+14.5 and +24.9% units, respectively) and increased tibia ash vs. NC (+13.8% units), equivalent to PC. The NC decreased AID of Cys, Gly, Thr, and Met vs. PC (P < 0.05). At 1,000 FTU/kg, phytase increased AID of all 17 AA vs. NC (P < 0.01), equivalent to PC. At 1,000 FTU/kg, AID AA responses (above NC) ranged from +4.5% (Met) to +15.0% (Cys), being maximal for essential Thr (+10.4%) and Val (+8.2%) and non-essential Cys (+15.0%) and Gly (+10.4%). The results highlight the efficacy of PhyG at a dose level of 500 to 1,000 FTU/kg in young broilers for improving the ileal digestibility of nitrogen, AA, and energy alongside P retention and tibia ash. The performance data emphasize the need to consider digestible nutrient intake as a response variable in exogenous enzyme studies.
dc.format.paginationskac037-
dc.identifier.author-urlhttps://www.ncbi.nlm.nih.gov/pubmed/35137139
dc.identifier.citationDersjant-Li Y, Abdollahi MR, Bello A, Waller K, Marchal L, Ravindran V. (2022). Effects of a novel consensus bacterial 6-phytase variant on the apparent ileal digestibility of amino acids, total tract phosphorus retention, and tibia ash in young broilers.. J Anim Sci. 100. 2. (pp. skac037-).
dc.identifier.doi10.1093/jas/skac037
dc.identifier.eissn1525-3163
dc.identifier.elements-typejournal-article
dc.identifier.issn0021-8812
dc.identifier.numberARTN skac037
dc.identifier.pii6523280
dc.identifier.urihttps://mro.massey.ac.nz/handle/10179/70445
dc.languageeng
dc.publisherOxford University Press
dc.relation.isPartOfJ Anim Sci
dc.rights(c) 2022 The Author/s
dc.rightsCC BY-NC 4.0
dc.rights.urihttps://creativecommons.org/licenses/by-nc/4.0/
dc.subjectamino acids
dc.subjectbroilers
dc.subjectgrowth performance
dc.subjectphytase
dc.subjecttibia ash
dc.subject6-Phytase
dc.subjectAmino Acids
dc.subjectAnimal Feed
dc.subjectAnimal Nutritional Physiological Phenomena
dc.subjectAnimals
dc.subjectChickens
dc.subjectDiet
dc.subjectDietary Supplements
dc.subjectDigestion
dc.subjectMale
dc.subjectPhosphorus
dc.subjectTibia
dc.titleEffects of a novel consensus bacterial 6-phytase variant on the apparent ileal digestibility of amino acids, total tract phosphorus retention, and tibia ash in young broilers
dc.typeJournal article
pubs.elements-id451135
pubs.organisational-groupOther
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