کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2458390 | 1554429 | 2006 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Interaction between ammonia, sodium and chloride transport across the rumen epithelium in sheep
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موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم دامی و جانورشناسی
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چکیده انگلیسی
The effect of increasing mucosal ammonia concentration [0 (control), 5, 15 and 30 mmol/l NH4Cl] on the electrophysiology of isolated rumen epithelium and the transport of Na+ and Clâ across it were studied, in vitro. Seventy-three isolated rumen epithelium samples from 14 sheep of different breeds, age and sex and solely fed on hay were used in this study. The presence of ammonia in the incubation solution on the mucosal side evoked a positive short-circuit current (Isc) and increased the transepithelial conductance (Gt). The unidirectional flux rates of Na+ were significantly (p < 0.05) reduced, while the mucosal to serosal and net flux rates for Clâ were significantly (p < 0.05) stimulated. It was determined that an 8 mmol/l intra-ruminal ammonia concentration could cause 50% inhibition of the maximal inhibitory effect of ammonia on Na absorption. It is proposed that ammonia interacts with the electroneutral Na+/H+ and Clâ/HCO3â exchangers of the rumen epithelium, probably by binding intracellular protons, thus elevating intracellular pH (pHi) and consequently inhibiting Na+ transport and stimulating Clâ transport across the isolated rumen epithelium of sheep. Inhibition of Na absorption could increase the osmolality of the rumen fluid, which has been reported to be a predisposing factor of diet-induced left displacement in the abomasum. Further, the increased osmolality of the rumen fluid could adversely affect the microbial growth and fermentation in the rumen.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Small Ruminant Research - Volume 63, Issues 1â2, May 2006, Pages 91-99
Journal: Small Ruminant Research - Volume 63, Issues 1â2, May 2006, Pages 91-99
نویسندگان
Khalid Abdoun, Katarina Wolf, Holger Martens,