Ruminal Kinetics of Nutrients Degradation, Hydration, and Functional Specific Gravity of Three Types of Beet Pulp
محورهای موضوعی : Camel
ا. تیموری یانسری
1
(Department of Animal Science, Faculty of Agricultural Science, Sari University of Agricultural Science and Natural Resources, Sari, Iran)
کلید واژه: ruminant feed, beet pulp, physically effective fiber, physical property,
چکیده مقاله :
Two experiments were conducted to evaluate the relationships between nutrients degradability, kinetics of hydration, functional specific gravity (FSG) of the three types of beet pulp (BP) including fine (FBP), normal (NBP) and pelleted (PBP) BP. In experiment 1, about 3 g of samples was weighed in sealed nylon bags (6 cm×7.5 cm, 40±5 µm pore size), incubated in rumen of two cannulated Holstein steers at 0, 3, 6, 12, 18, 24, 36 and 48 h. The dry matter (DM) degradation was different among the treatments for soluble, slowly and potentially degradable fractions, rate of degradation, and effective degradability. In experiment 2, after ruminal incubation of two bags at 0, 0.5, 1, 1.5, 3, 6, 12, 18, 24, 36 and 48 h, the bags were removed without and with washing, the kinetic of hydration, functional specific gravity (FSG) measured with pycnometer. Hydration rate and water holding capacity (WHC) were different. Grinding and pelleting decreased hydration rate and WHC of BP, but increased initial and final FSG over incubation time. Soluble, slowly degradable, and indigestible fraction of DM explained 82.4, 94.8, 2.7, 54.2, 87.3 and 79.7%; 34.1, 50.0, 2.2, 31.4, 62.2 and 63.4%; and 89.1, 12.2, 68.0, 84.7 and 92.9% of the total variation of the fractional rate of degradation, effective degradability, hydration rate, WHC, initial and final FSG, respectively. In addition, the correlations between digestion and hydration parameters were high. As BP has lower than critical size, can easily pass from the reticulorumen orifice, therefore, its FSG is more important to control ruminal retention time and degradation.
دو آزمایش برای ارزیابی رابطه بین قابلیت تجزیه مواد مغذی، کنتیک هیدراسیون، گرانروی خاص عملکردی (FSG) سه نوع پالپ چغندرقند (BP) شامل ریز (FBP)، نرمال (NBP) و پلت شده (PBP) انجام شد. در آزمایش اول، حدود سه گرم از نمونه­ها وزن شده و در کیسه­های نایلونی (6 سانتی­متر×5/7 سانتی­متر با اندازه سوراخ­های 5±40) بسته­بندی شده و در شکمبه دو گاو نر اخته هلشتاین کانوله­گذاری شده به مدت 0، 3، 6، 12، 18، 24، 36 و 48 ساعت انکوباسیون گردیدند. تجزیه ماده خشک (DM) بین تیمارها برای بخش­های قابل تجزیه محلول، کُند و بالقوه، نرخ تجزیه و تجزیه­پذری مؤثر متفاوت بود. در آزمایش دوم، پس از انکوباسیون شکمبه­ای دو کیسه به مدت 0، 5/0، 1، 5/1، 3، 6، 12، 18، 24، 36 و 48 ساعت، کیسه­ها بدون شستشو و با شستشو برداشته شده و کنتیک هیدراسیون، گرانروی خاص عملکردی (FSG) با پیکنومتر اندازه­گیری شدند. نرخ هیدراسیون و ظرفیت نگهداری آب (WHC) متفاوت بودند. آسیاب کردن و پلت نمودن منجر به کاهش نرخ هیدراسیون و WHC پالپ چغندرقند گردید. ولی FSG اولیه و نهایی را در طی زمان انکوباسیون افزایش داد. بخش­های قابل تجزیه محلول، کُند و قابل هضم DM به ترتیب 4/82، 8/94، 7/2، 2/54، 3/87 و 7/79 درصد، 1/34، 0/50، 2/2، 4/31، 2/62 و 4/63 درصد و 1/89، 2/12، 0/68، 7/84 و 9/92 درصد از تنوع کُل نرخ تجزیه بخشی، قابلیت تجزیه مؤثر، نرخ هیدراسیون، WHC و FSG اولیه و نهایی را توصیف می­کردند. علاوه بر این، همبستگی بین پارامترهای هضم و هیدراسیون بالا بود. چون BP کمتر از اندازه ضروری بود، می­تواند به آسانی از منافذ شکمبه و روده عبور کرده و بنابراین FSG آن برای کنترل زمان ماندگاری و تجزیه شکمبه­ای از اهمیت بیشتری برخوردار است.
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