کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8882651 | 1625238 | 2016 | 33 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Performance, litter quality and gaseous odour emissions of broilers fed phytase supplemented diets
ترجمه فارسی عنوان
عملکرد، کیفیت بستر و انتشار گازهای گازی جوجه های گوشتی با رژیم های غذایی افزوده فیتاز
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کلمات کلیدی
جوجه گوشتی کیفیت لنت، مرغ گوشتی بخور کارایی، فیتاز،
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم دامی و جانورشناسی
چکیده انگلیسی
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 2Â ÃÂ 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, 1,500Â FTU/kg. The PC was formulated to meet the 2014 Ross 308 nutrient specifications, whereas the NC was formulated with lower Ca (â1.4Â g/kg), available P (â1.5Â g/kg), Na (â0.3Â g/kg), dLys (â0.2Â g/kg) and MEn (â0.28Â 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 1,500Â FTU/kg, respectively (PÂ <Â 0.01) across all diets. Phytase by diet interactions on BW gain were observed on d 24 and 35 (PÂ <Â 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 68Â g in the PC and 127, 233 and 173Â g in the NC at 500, 1,000 and 1,500Â FTU/kg, respectively. Diet by phytase interactions were also observed for tibia ash, litter quality and water to feed intake ratio (PÂ <Â 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 (PÂ >Â 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 (PÂ >Â 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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Animal Nutrition - Volume 2, Issue 4, December 2016, Pages 288-295
Journal: Animal Nutrition - Volume 2, Issue 4, December 2016, Pages 288-295
نویسندگان
Nishchal K. Sharma, Mingan Choct, Shu-Biao Wu, Robert Smillie, Natalie Morgan, Amal S. Omar, Nisha Sharma, Robert A. Swick,