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Original Articles

Studies on food conversion in the digestive tract of juvenile bulls

3. Rumen liquor investigationsFootnote1

, &
Pages 169-180 | Received 26 Oct 1993, Published online: 10 Jan 2009
 

Abstract

Two bulls with a permanant rumen fistula and a re‐entrant cannula at the duodenum were fed various concentrates and straw (dry matter ration composition: 60% concentrate, 40% straw). Negative correlations were found between the pH value and total fatty acid concentration (r = ‐0,70). The animals were given the straw one hour before the concentrate. The pH value increased to not more than 7.3 one hour after they had received the straw. It did not drop below 6.4 after the concentrate with any of the rations. The addition of dried sugar beet pulp to the rations leads to a higher mean acetate concentration than the other rations and causes an unvarying high total fatty acid concentration.

Zwei Bullen mit einer permanenten Pansenfistel und einer Umleitungskanüle am Duodenum wurden mit unterschiedlichen Konzentraten und Stroh gefüttert (Trockensubstanz der Ration: 60% Konzentrat, 40% Stroh). Zwischen pH‐Wert und Gesamtfettsäurekonzentration wurden negative Korrelationen gefunden (r = ‐0,70). Stroh wurde 1 Stunde vor der Konzentratgabe gefüttert. Eine Stunde nach der Strohgabe stieg der pH‐Wert bis auf maximal 7,3 an. Nach der Konzentratgabe fiel der pH‐Wert bei keiner Ration unter 6,4 ab. Trockenschnitzelgaben erhöhten gegenüber den anderen Rationen die durchschnittliche Azetatkonzentration und verursachten gleichbleibend hohe Gesamtfettsäurekonzentrationen.

Notes

Wir danken der Deutschen Forschungsgemeinschaft für die finanzielle Unterstützung dieser Arbeit.

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