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• W1487482010 abstract "Urea recycling in ruminants has been studied extensively in the past, but the mechanisms regulating the amount of urea recycled or excreted remain obscure. To elucidate the role of urea transporters (UT) in N recycling, nine Dorset-Finn ewe lambs (20.8 ± 0.8 kg) were fed diets containing 15.5, 28.4, and 41.3 g of N/kg of DM for 25 d. Nitrogen balance and urea N kinetics were measured during the last 3 d of the period. Animals were then slaughtered and mucosa samples from the rumen, duodenum, ileum, and cecum, as well as kidney medulla and liver, were collected. Increasing N intake tended to increase N balance quadratically (1.5, 5.1, and 4.4 ± 0.86 g of N/d, P < 0.09), and linearly increased urinary N excretion (2.4, 10, and 16.5 ± 0.86 g N/d, P < 0.001) and plasma urea N concentration (4.3, 20.3, and 28.4 ± 2.62 mg of urea N/dL, P < 0.001), but did not affect fecal N excretion (5.0 ± 0.5 g of N/d; P < 0.94). Urea N production (2.4, 11.8, and 19.2 ± 0.83 g of N/d; P < 0.001) and urinary urea N excretion (0.7, 7.0, and 13.4 ± 0.73 g N/d; P < 0.001) increased linearly with N intake, as well as with the urea N recycled to the gastrointestinal tract (1.8, 4.8, and 5.8 ± 0.40 g of N/d, P < 0.001). No changes due to N intake were observed for creatinine excretion (518 ± 82.4 mg/d; P < 0.69) and clearance (46 ± 10.7 mL/min; P < 0.56), but urea N clearance increased linearly with N intake (14.9, 24.4, and 34.9 ± 5.9 mL/min; P < 0.04). Urea N reabsorption by the kidney tended to decrease (66.3, 38.5, 29.1 ± 12.6%; P < 0.06) with increasing N content of the diet. Increasing the level of N intake increased linearly the weight of the liver as a proportion of BW (1.73, 1.88, and 2.22 ± 0.15%, P < 0.03) but only tended to increase the weight of the kidneys (0.36, 0.37, and 0.50 ± 0.05%, P < 0.08). Urea transporter B was present in all the tissues analyzed, but UT-A was detected only in kidney medulla, liver, and duodenum. Among animals on the three diets, no differences (P > 0.10) in UT abundance, quantified by densitometry, were found. Ruminal-wall urease activity decreased linearly (P < 0.02) with increasing level of N intake. Urease activity in duodenal, ileal, and cecal mucosa did not differ from zero (P > 0.10) in lambs on the high-protein diet. In the present experiment, urea transporter abundance in the kidney medulla and the gastrointestinal tract did not reflect the increase in urea-N reabsorption by the kidney and transferred into the gut." @default.
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• W1487482010 date "2004-04-01" @default.
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• W1487482010 title "Effect of nitrogen intake on nitrogen recycling and urea transporter abundance in lambs12" @default.
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• W1487482010 doi "https://doi.org/10.2527/2004.8241157x" @default.
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