Please use this identifier to cite or link to this item:
|Title:||Performance, litter quality and gaseous odour emissions of broilers fed phytase supplemented diets||Contributor(s):||Sharma, Nishchal K (author); Choct, Mingan (author) ; Wu, Shubiao (author) ; Smillie, Robert (author); Morgan, Natalie (author) ; Omar, Amal S (author); Sharma, Nisha (author); Swick, Robert A (author)||Publication Date:||2016||Open Access:||Yes||DOI:||10.1016/j.aninu.2016.10.003||Handle Link:||https://hdl.handle.net/1959.11/20339||Abstract:||The effect of graded levels of phytase on performance, bone characteristics, excreta/litter quality and odorant emissions was examined using 720 Ross 308 male d-old broilers. A 2 × 4 factorial arrangement of treatments was employed with 6 replicates of 15 birds per pen. Factors were: diets-positive and negative control (PC, NC); phytase – 0, 500, 1,000, 1,500 FTU/kg. The PC was formulated to meet the 2014 Ross 308 nutrient specifications, whereas the NC was formulated with lower Ca (-1.4 g/kg), available P (-1.5 g/kg), Na (-0.3 g/kg), dLys (-0.2 g/kg) and MEn (-0.28 MJ/kg) equivalent to nutrient matrix values for 500 FTU/kg phytase in the starter, grower and finisher periods (i.e., downspec diet). On d 24, phytase decreased FCR by 1.6, 4.3 and 4.6 points at inclusion levels of 500, 1,000 and 1,500 FTU/kg, respectively (P < 0.01) across all diets. Phytase by diet interactions on BW gain were observed on d 24 and 35 (P < 0.01). The effect of phytase was much more pronounced in the NC diet as compared with the PC diet. On d 24, phytase increased BW gain by 37, 55 and 68 g in the PC and 127, 233 and 173 g in the NC at 500, 1,000 and 1,500 FTU/kg, respectively. Diet by phytase interactions were also observed for tibia ash, litter quality and water to feed intake ratio (P < 0.01) with higher phytase effect in NC as compared with PC. Neither diet nor phytase impacted excreta moisture content on d 18 or 21 (P > 0.05). Solid phase micro-extraction gas chromatography-mass spectrometry (SPME-GC-MS) analysis of gaseous emissions on d 39 indicated no difference in the emission of alcohols, aldehydes, ketones, volatile fatty acids and phenols between treatments (P > 0.05). The results indicate that phytase has greater benefits when formulated using nutrient matrix values as compared with adding it over the top in an already nutrient sufficient diet. The later method would be expected to increase feed costs without concomitant performance benefits.||Publication Type:||Journal Article||Source of Publication:||Animal Nutrition, 2(4), p. 288-295||Publisher:||Zhongguo Xumu Shouyi Xuehui [Chinese Association of Animal Science and Veterinary Medicine]||Place of Publication:||China||ISSN:||2405-6545||Field of Research (FOR):||070204 Animal Nutrition||Peer Reviewed:||Yes||HERDC Category Description:||C1 Refereed Article in a Scholarly Journal||Statistics to Oct 2018:||Visitors: 32
|Appears in Collections:||Journal Article|
Files in This Item:
checked on Nov 30, 2018
checked on Feb 6, 2019
Items in Research UNE are protected by copyright, with all rights reserved, unless otherwise indicated.