کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8981281 | 1108149 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Grazing Behavior Affects Daily Ruminal pH and NH3 Oscillations of Dairy Cows on Pasture
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم دامی و جانورشناسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Grazing Behavior Affects Daily Ruminal pH and NH3 Oscillations of Dairy Cows on Pasture Grazing Behavior Affects Daily Ruminal pH and NH3 Oscillations of Dairy Cows on Pasture](/preview/png/8981281.png)
چکیده انگلیسی
Grazing behavior of Holstein cows in late lactation at 2 pasture allowances without or with supplementation was studied in a single reversal design. Twenty multiparous cows (4 ruminally cannulated) grazed a bromegrass/orchardgrass pasture offered at 2 pasture allowances: 1) low, and 2) high, with 25 and 40Â kg/d of DM per cow, respectively. Half of the cows were supplemented with a mineral/vitamin mixture (1Â kg/ d of the mix in a corn/molasses carrier) and the other half supplemented with a corn-based concentrate (1Â kg of concentrate per 4Â kg of milk). Automatic behavior recorders were used to measure grazing time and number of bites. For the mineral/vitamin mixture-supplemented cows, grazing time and number of bites after the p.m. milking was greater and ruminal pH was numerically lower at the high pasture allowance. For the concentrate-supplemented cows, grazing behavior and ruminal pH did not differ between the 2 pasture allowances. Pattern of grazing time of mineral/vitamin mixture-supplemented and concentrate-supplemented cows influenced daily oscillations of ruminal pH and NH3-N concentration. Pasture allowance affected grazing behavior of mineral/vitamin mixture-supplemented cows; however grazing behavior of concentrate-supplemented cows was not affected by pasture allowance.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Dairy Science - Volume 88, Issue 1, January 2005, Pages 303-309
Journal: Journal of Dairy Science - Volume 88, Issue 1, January 2005, Pages 303-309
نویسندگان
F. Bargo, L.D. Muller,