کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8981225 | 1108147 | 2005 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The Effect of Concentrate Supplementation on Nutrient Flow to the Omasum in Dairy Cows Receiving Freshly Cut Grass
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کلمات کلیدی
digestible OMpotentially digestible NDFDNDFRDNECMiNDF - Indfindigestible NDF - NDF غیر قابل تحملMetabolizable energy - انرژی متابولیزه شدهConcentrate - تمرکزNutrient flow - جریان تغذیهMicrobial protein synthesis - سنتز پروتئین میکروبیenergy-corrected milk - شیر اصلاح شده با انرژیDOM - قضاوتSubstitution rate - نرخ تعویضMPs - نمایندگان مجلسGrass - چمنDairy cow - گاو شیری
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم دامی و جانورشناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
An experiment was carried out to determine the effect of increasing the amount of grain-based concentrate (0, 3, or 6Â kg/d) on nutrient flow to the omasum, rumen fermentation pattern, milk yield, and nutrient use of dairy cows. Harvested timothy-meadow fescue grass was fed individually 3 times daily to 6 rumen-cannulated Holstein-Friesian cows in a duplicated 3Â ÃÂ 3 Latin square experiment. Grass was offered as 6 equal meals daily, and concentrates were fed as 2 equal meals daily. Nitrogen, microbial N, and neutral detergent fiber (NDF) flow from the rumen were measured using an omasal sampling technique in combination with a triple marker method [CoEDTA, Yb, and indigestible NDF (INDF) as markers]. Concentrate supplementation linearly decreased ruminal pH, N degradability, ammonia N concentration, and molar proportion of acetate and increased the molar proportion of butyrate. Supplementation of grass with concentrates linearly increased dry matter intake (DMI), microbial N synthesis, N, and NDF flow to the omasum, and ruminal and total tract NDF digestibility decreased linearly. Decreases in NDF digestibility in response to concentrates was primarily related to a decrease in the rate of digestion. Increased DMI overcame the negative effects of concentrate on NDF digestion, resulting in a linear increase in total metabolizable energy intake and milk production. Physical constraints were found not to limit grass DMI. Concentrate supplementation increased the apparent use of dietary N for milk production because of a reduction in N intake, rather than thorough improvements in N capture in the rumen.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Dairy Science - Volume 88, Issue 4, April 2005, Pages 1443-1453
Journal: Journal of Dairy Science - Volume 88, Issue 4, April 2005, Pages 1443-1453
نویسندگان
A. Sairanen, H. Khalili, J.I. Nousiainen, S. Ahvenjärvi, P. Huhtanen,