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Accession number;04A0022336
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| Title;Improvement of Nitrogen Utilization with Manipulation of Urea Recycling in Beef Cattle |
| Author;
OBITSU TAKETO
(Hiroshima Univ., Graduate School of Biosphere Sci., JPN)
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Journal Title;Shokuniku ni kansuru Josei Kenkyu Chosa Seika Hokokusho
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Journal Code:X0296A
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ISSN:
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VOL.21;NO.;PAGE.124-127(2003)
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| Figure&Table&Reference;FIG.3, REF.6 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;Four cross-bred fattening beef cows were used in a cross-over design to investigate the effect of dietary crude protein(CP) content on urea kinetics and recycling. Two isocaloric diets containing 90% of concentrates with a CP content of 10 and 13%(10CP and 13CP) were fed at 90% of voluntary feed intake of each cow. Urine and feces were collected over 4 days after the injection of double N-labeled urea through the jugular vein. Urea isotopomers in the urine were analyzed to calculate the entry rate(UER), gastrointestinal entry rate(GER), urinary excretion rate(UER) and retune to ornithine cycle(ROC) of urea-N. The intake and digestibility of dry matte were tended to be lower for 10CP diet. Nitrogen digestibility was also lower for 10CP diet. Urea-N entry rate and UER were reduced with 10CP diet. Gastrointestinal entry of urea-N was similar between both diets, but the proportion of GER to UER(49 vs 44%) was greater for 10CP diet. Return to ornithine cycle of urea-N entered the digestive tracts was tended to be greater for 13CP diet. (author abst.) |
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