کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10973149 | 1108011 | 2016 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The effects on digestibility and ruminal measures of chemically treated corn stover as a partial replacement for grain in dairy diets1
ترجمه فارسی عنوان
تأثیرات بر قابلیت هضم و اندازه گیری شبیه ذرت تحت تاثیر شیمیایی به عنوان جایگزینی جزئی برای غلات در رژیم های لبنی 1
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کلمات کلیدی
ذرت، اکسید کلسیم، قلیایی، هضم فیبر،
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم دامی و جانورشناسی
چکیده انگلیسی
Alkaline treatment of gramineous crop residues can convert an abundant, minimally utilized, poorly digestible straw into a moderately digestible feedstuff. Given the volatile nature of grain prices, substitution of treated stover for grain was investigated with dairy cows to provide insights on ruminal and digestibility effects of a feed option that makes use of alternative, available resources. The objective of this study was to evaluate changes in diet digestibility and ruminal effects when increasing levels of calcium oxide-treated corn stover (CaOSt) were substituted for corn grain in diets of lactating cows. Mature corn stover was treated with calcium oxide at a level of 50Â gâkgâ1 dry matter (DM), brought up to a moisture content of 50% following bale grinding, and stored anaerobically at ambient temperatures for greater than 60Â d before the feeding experiment. Eight ruminally cannulated Holstein cows averaging 686Â kg of body weight and 35Â kg of milkâdâ1 were enrolled in a replicated 4Â ÃÂ 4 Latin square, where CaOSt replaced corn grain on a DM basis in the ration at rates of 0, 40, 80, and 120Â gâkgâ1 DM. All reported significant responses were linear. The DM intake declined by approximately 1Â kg per 4% increase in CaOSt inclusion. With increasing replacement of corn grain, dietary neutral detergent fiber (NDF) concentration increased. However, rumen NDF turnover, NDF digestibility, NDF passage rate, and digestion rate of potentially digestible NDF were unaffected by increasing CaOSt inclusion. Total-tract organic matter digestibility declined by 5 percentage units over the range of treatments, approximately 1.5 units per 4-percentage-unit substitution of CaOSt for grain. With increasing CaOSt, the molar proportions of butyrate and valerate declined, whereas the lowest detected ruminal pH increased from 5.83 to 5.94. Milk, fat, and protein yields declined as CaOSt increased and DM intake declined with the result that net energy in milk declined by approximately 1 Mcal per 4% increase in CaOSt. Time spent ruminating (minâkgâ1 DM intake) increased with increasing CaOSt, though total minutes per day were unaffected. These insights on the effect of substitution of treated corn stover for corn grain may be used to predict the effect on nutrient supply to the cow over a range of substitution levels. The acceptability of the effect will depend on the economics of milk production and availabilities of feedstuffs.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Dairy Science - Volume 99, Issue 8, August 2016, Pages 6342-6351
Journal: Journal of Dairy Science - Volume 99, Issue 8, August 2016, Pages 6342-6351
نویسندگان
D.E. Cook, D.K. Combs, P.H. Doane, M.J. Cecava, M.B. Hall,