Comparing Logistic and Michaelis-Menten Multiphasic Models for Analysis of in vitro Gas Production Profiles of some Starchy Feedstuffs
محورهای موضوعی : Camelا. پرند 1 , ع.ر. وکیلی 2 , م. دانش مسگران 3
1 - Department of Animal Science, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran
2 - Department of Animal Science, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran
3 - Department of Animal Science, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran
کلید واژه: gas production, cereals, multi-phasic models,
چکیده مقاله :
Two multi-phasic models (logistic (LOG) and Michaelis-Menten (MM)) with three sub-curves were used to describe gas production kinetics of corn (CG), barley (BG), wheat (WG) and triticale (TG) grains. In each model sub curve, 1 describes the gas production caused by fermentation of the soluble fraction, gas production caused by fermentation of the non-soluble fraction is described in sub curve 2 and sub curve 3 represents gas production by microbial turnover. With MM model TG and WG had highest gas production from the soluble fraction followed by BG and CG. With LOG model there was no difference in gas production from the soluble fraction between BG and CG (P>0.05) and TG and WG (P>0.05) but TG and WG had higher gas volume from this fraction comparing to CG and BG (P<0.05). For gas production caused by fermentation of the non-soluble fraction, CG had the highest volume using MM model and CG and BG had higher volume with LOG model comparing to WG and TG (P<0.05). With MM model BG had highest gas production by microbial turnover but with LOG model WG and TG had higher gas production for the third sub curve. The LOG model had a slightly better fitting performance comparing to MM model in the present study but considering the methodology of this trial and the nature of models it does not necessarily represent the superiority of LOG model over MM model.
در این پژوهش از دو مدل چند‌بخشی (لجستیک (LOG) و میکائیلیس–منتن (MM)) دارای سه زیر بخش به منظور بررسی کینتیک تولید گاز در خوراک‌های دانه ذرت، دانه جو، دانه گندم و دانه تریتیکاله استفاده شد. در هر مدل زیربخش اول بیان کننده تولید گاز ناشی از تخمیر بخش محلول خوراک‌ها، زیربخش دوم توضیح دهنده گاز حاصل از تخمیر بخش نامحلول خوراک‌ها و زیربخش سوم نشان دهنده تولید گاز حاصل از ترن آور میکروبی است. با استفاده از مدل MM میزان تولید گاز از بخش محلول به ترتیب از بیشترین به کمترین برای دانه‌های تریتیکاله، گندم، ذرت و جو به دست آمد. با استفاده از مدل LOG در گاز حاصل از تخمیر بخش محلول تفاوتی بین دانه‌های جو و ذرت (05/0P>) و دانه‌های تریتیکاله و گندم (05/0P>) وجود نداشت اما تولید گاز حاصل از این بخش برای دانه‌های تریتیکاله و گندم بالاتر از دانه‌های جو و ذرت بود (05/0P<). برای تولید گاز ناشی از تخمیر بخش نامحلول دانه ذرت با استفاده از مدل MM بیشترین بود و تولید گاز ناشی از تخمیر بخش نامحلول برای دانه‌های ذرت و جو با استفاده از مدل LOG بیشتر از دانه‌های تریتیکاله و گندم بود (05/0P<). با استفاده از مدل MM، تولید گاز ناشی از ترن آور میکروبی برای دانه جو بیشترین بود در حالیکه تولید گاز در زیربخش سوم برای دانه‌های تریتیکاله و گندم با استفاده از مدل LOG بیشترین بود. در پژوهش حاضر نیکویی برازش برای مدل LOG کمی بهتر از مدل MM بود اما با در نظر گرفتن شرایط مطالعه حاضر این مطلب نمی‌تواند به طور قطع بیانگر توانایی بهتر مدل LOG در توضیح کینتیک تولید گاز از منابع نشاسته‌ای در مقایسه با مدل MM باشد.
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