Purin- und Pyrimidinmetaboliten zur Beurteilung des Pansenstoffwechsels: HPLC-Analysen in Milch und Blutplasma

Rosskopf, R.; Rainer, H.; Giesecke, D.

doi:10.1080/17450399109428482

Cited by 16 publications

(8 citation statements)

References 26 publications

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“…Urinary concentrations of pseudouridine (Table 1) were similar to the 2.2 mmol/day of the non-lactating cows measured by Puchala et al (1993); however, plasma pseudouridine concentrations were not in the range of Rosskopf et al (1991), who found 0.006 ± 0.0016 mmol L − 1 circulating in bovine blood plasma. The cattle used in the study of Rosskopf et al (1991) were milking cattle and not rapidly growing beef steers, and this may account for the discrepancy.…”

Section: Discussionsupporting

confidence: 47%

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Creatinine and pseudouridine in plasma and urine from Brahman-cross steers fed a low, medium or high plane of nutrition

2008

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Section: Discussionsupporting

confidence: 47%

“…The cattle used in the study of Rosskopf et al (1991) were milking cattle and not rapidly growing beef steers, and this may account for the discrepancy.…”

Section: Discussionmentioning

confidence: 88%

Creatinine and pseudouridine in plasma and urine from Brahman-cross steers fed a low, medium or high plane of nutrition

2008

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“…VI) were rather low compared to values reported in the literature for lactating cows (370.6 ± 79.1 µmol . L -1 , [47]) or ovines (12.2 ± 3.5 mmol . d -1 , [51]).…”

Section: Rumen Microbial Growthmentioning

confidence: 99%

“…review by Shingfield [51]). Moreover, blood allantoin concentrations in cattle have been correlated with renal excretion of purine derivatives [11,24,47] and rumen microbial growth [55]. Hence, in our experiments, the effect of dietary treatment on duodenal microbial N supply has been evaluated from the renal excretion of purine derivatives (Exps.…”

Section: Rumen Microbial Growthmentioning

confidence: 99%

Effect of level and origin of rumen degradable nitrogen on rumen microbial growth and nitrogen utilisation efficiency of animals fed maize silage at maintenance

et al. 2001

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-Isoenergetic maize silage diets, fed at maintenance to 24 suckling cows (Exp. 1) and to 3 (Exp. 2) or 4 (Exp. 3) rumen fistulated sheep, were compared with a urea and controlled release NPN diet (Exps. 1 and 2) and with a protein-N supplemented diet (Exp. 3). Supplementation increased blood urea concentrations (44.7 ± 22.3 vs. 97.6 ± 23.7 mg urea-N . L -1 ) (Exp. 1) and renal urea excretion (2.5 ± 1.1 vs. 7.6 ± 1.8 g urea-N . d -1 ) (Exps. 2 and 3), whereas blood allantoin concentrations (286.7 ± 77.0 µmol . L -1 ) (Exp. 1) and renal excretion of purine derivatives (357.6 ± 90.7 mg purine-N . d -1 ) (Exps. 2 and 3) were not affected, indicating additional N supplementation did not improve rumen microbial growth. However, some deficiency of rumen degradable N might occur in non supplemented diets as suggested by the reduced rumen NH 3 -N and RNA concentrations (868 ± 270 vs. 1466 ± 466 mg RNA . kg -1 rumen contents).

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“…Die Ausscheidung erfolgt hauptsachlich iiber die Nieren. Gut mefibare Mengen von Allantoin sind auch in der Milch vorhanden (TIEMEYER et al, 1984;ROSSKOPF et al, 1991). Da die mikrobielle Synthese im Pansen mafigeblich von der Verfugbarkeit an verdaulicher Energie abhangt (MCALLAN et al, 1986) (WATTS, 1981).…”

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Untersuchungen an Kühen über den Einfluß der Energieaufnahme auf den Pansenstoffwechsel mittels der Allantoinausscheidung in der Milch*

Rosskopf

Giesecke

1992

Journal of Veterinary Medicine Series A

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Summary Investigations in cows on the influence of energy intake on rumen metabolism by means of allantoin excretion in the milk With two groups of dairy cows (A: 12 German Black and White‐ and 6 German Simmental Cows; B: 16 German Black and White‐ and 11 German Simmental Cows) allantoin concentrations of blood plasma (A) and milk (A and B) were analysed by HPLC. There exists a close correlation (r = 0.758) between allantoin concentration in blood plasma (370.6 ± 79.1 μmol/l) and milk (474.1 ± 78.9μmol/l). The relation between milk yield and allantoin excretion with milk seems to be non‐linear (r = 0.936). On the other hand there is a close correlation between energy intake with feed and allantoin excretion via milk (r = 0.885). In a further experiment the allantoin concentrations in blood plasma of 5 Angler steers were monitored for 24 h every second hour with feeding twice daily. There were remarkable fluctuations in the allantoin concentration from nearly 156 to 129 μmol/l. After that the rumen of the steers was emptied, while plasma concentrations were still monitored the same way as before. Concentrations of allantoin declined for about 55% to 65 μmol/l. Zusammenfassung An zwei Gruppen von Milchkühen (A: 12 DSB‐ und 6 DFV‐Kühe; B: 16 DSB‐ und 11 DFV‐Kühe) wurden die Allantoinkonzentrationen in Blutplasma (A) und Milch (A und B) mittels HPLC‐Analysen untersucht. Zwischen den Allantoinkonzentrationen im Blutplasma (370,6 ± 79,1 μmol/l) und in der Milch (474,1 ± 78,9 μmol/l) besteht eine enge Korrelation (r = 0,758). Der Zusammenhang zwischen Milchleistung und Allantoinausscheidung über die Milch erscheint als nicht‐lineare Beziehung (r = 0,936). Die Energieaufnahme über das Futter und die Allantoinausscheidung über die Milch sind eng korreliert (r = 0,885). In einem weiteren Versuch wurden bei 5 Angler‐Ochsen die Allantoinkonzentrationen im Blutplasma bei zweimaliger Fütterung pro Tag im 2stündigem Rhythmus über 24 Stunden aufgezeichnet. Dabei traten nennenswerte Schwankungen von erwa 156 bis 129 μmol/l auf. Anschließend wurde der Panseninhalt entfernt und die Allantoinkonzentration weiter verfolgt. Das Konzentrationsniveau sank um etwa 55 % auf etwa 65 μmol/l ab.

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Purin- und Pyrimidinmetaboliten zur Beurteilung des Pansenstoffwechsels: HPLC-Analysen in Milch und Blutplasma

Cited by 16 publications

References 26 publications

Creatinine and pseudouridine in plasma and urine from Brahman-cross steers fed a low, medium or high plane of nutrition

Creatinine and pseudouridine in plasma and urine from Brahman-cross steers fed a low, medium or high plane of nutrition

Effect of level and origin of rumen degradable nitrogen on rumen microbial growth and nitrogen utilisation efficiency of animals fed maize silage at maintenance

Untersuchungen an Kühen über den Einfluß der Energieaufnahme auf den Pansenstoffwechsel mittels der Allantoinausscheidung in der Milch*

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