کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10973793 | 1108018 | 2016 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of pulsation rest phase duration on teat end congestion
ترجمه فارسی عنوان
اثر مدت زمان فرسایش بطن چپ در تراکم گاو نر
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کلمات کلیدی
شیردوشی، ضربان قلب، تراکم قلبی، جریان شیر،
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم دامی و جانورشناسی
چکیده انگلیسی
The objective of this study was to quantify the effect of d-phase (rest phase) duration of pulsation on the teat canal cross-sectional area during the period of peak milk flow from bovine teats. A secondary objective was to test if the effect of d-phase duration on teat canal cross-sectional area was influenced by milking system vacuum level, milking phase (b-phase) duration, and liner overpressure. During the d-phase of the pulsation cycle, liner compression facilitates venous flow and removal of fluids accumulated in teat-end tissues. It was hypothesized that a short-duration d-phase would result in congestion of teat-end tissue and a corresponding reduction in the cross-sectional area of the teat canal. A quarter milking device, designed and built at the Milking Research and Instruction Laboratory at the University of Wisconsin-Madison, was used to implement an experiment to test this hypothesis. Pulsator rate and ratios were adjusted to achieve 7 levels of d-phase duration: 50, 100, 150, 175, 200, 250, and 300Â ms. These 7 d-phase durations were applied during one milking session and were repeated for 2 vacuum levels (40 and 50Â kPa), 2 milking phase durations (575 and 775Â ms), and 2 levels of liner overpressure (9.8 and 18Â kPa). We observed a significant reduction in the estimated cross-sectional area of the teat canal with d-phase durations of 50 and 100Â ms when compared with d-phase durations of 150, 175, 225, 250, and 300Â ms. No significant difference was found in the estimated cross-sectional area of the teat canal for d-phase durations from 150 to 300Â ms. No significant interaction was observed between the effect of d-phase and b-phase durations, vacuum level, or liner overpressure.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Dairy Science - Volume 99, Issue 5, May 2016, Pages 3958-3965
Journal: Journal of Dairy Science - Volume 99, Issue 5, May 2016, Pages 3958-3965
نویسندگان
J. Upton, J.F. Penry, M.D. Rasmussen, P.D. Thompson, D.J. Reinemann,