Performance,litter quality and gaseous odour emissions of broilers fed phytase supplemented diets

作     者：Nishchal K.Sharma Mingan Choct Shu-Biao Wu Robert Smillie Natalie Morgan Amal S.Omar Nisha Sharma Robert A.Swick 

作者机构：School of Environmental and Rural Science University of New England Poultry Cooperative Research Centre University of New England Animal Production Research Institute Agricultural Research Centre 

出 版 物：《Animal Nutrition》 (动物营养（英文版）)

年 卷 期：2016年第2卷第4期

页      面：288-295页

学科分类：090502[农学-动物营养与饲料科学] 0905[农学-畜牧学] 09[农学] 

基　　金：supported under the Australian Government's Cooperative Research Centres Program a part of Poultry CRC sub project grant 2.2.8 

主　　题：Broiler Litter quality Meat chickens Odour Performance Phytase 

摘      要：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 x 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 0.05). Solid phase microextraction 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.