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Vihermäki, Rasmus, 2019. The effect of ration forage proportions on the microbial ecology of the Rumen. First cycle, G2E. Uppsala: SLU, Dept. of Animal Nutrition and Management

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Abstract

Grovfoder utgör en stor del av kons foderintag och dess struktur är viktig för kons hälsa. En foderstat som till största delen innehåller kraftfoder främjar tillväxten av exempelvis Lactobacilli och Streptococcus bovis (S.bovis) som i sin tur producerar laktat. Laktat sänker pH i vommen och kan leda till vomacidos. Laktatomvandlande mikroorganismer kan inte omvandla laktat till flyktiga fettsyror (VFA) i samma hastighet och utsträckning som Lactobacilli producerar laktat. Vid idissling främjas salivproduktionen, ett av kons buffertsystem. Det finns ingen direkt koppling till att enbart grovfoder- och kraftfoderproportionerna har en inverkan på den totala koncentrationen av flyktiga fettsyror. Vid jämförelse av två grovfoder gav det ena en högre koncentration av flyktiga fettsyror (VFA) vilket indikerar att grovfoder- till kraftfoderproportionerna inte är den enda betydande faktorn. Däremot tycktes det finnas en koppling mellan foderstatens-kraftfoderandel och proportionerna propionat:acetat:butyrat. En ökad mängd kraftfoder i dieten gav upphov till protozotillväxt vilken i sin tur ger en högre andel butyrat. Grovfodrets partikelstorlek och grovfodertyp (gröda, konserveringsmetoder etc.) tycktes även ha en inverkan på koncentrationen av flyktiga fettsyror.

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Forage constitutes a large part of the cow’s feed intake and its structure is important for the cow’s health. A ration that mainly contains concentrates promotes the growth of, for example, Lactobacilli and Streptococcus bovis (S.bovis), which in turn produces lactate. Lactate lowers the pH in the rumen and may lead to rumen acidosis. Bacteria specialized in fermenting lactate into VFA are unable to convert at the same rate and extent as Lactobacilli can produce lactate. During rumination, saliva production is promoted, one of the cow’s buffer system. There is no connection that it is only the forage to concentrate ratio that has a direct effect on the total VFA concentration. When comparing two forage feeds, one gave a higher concentration of VFA which indicates that forage to concentrate ratio is not the only significant factor. However, the proportion of concentrate feed appeared to have an effect on the propionate:acetate:butyrate ratio. An increased amount of concentrate in the diet promotes the growth of protozoa which in turn give a higher proportion of butyrate. The particle size of the forage feed and which type of forage (crop, conservation method etc.) also appear to influence the VFA concentration.

Main title:The effect of ration forage proportions on the microbial ecology of the Rumen
Authors:Vihermäki, Rasmus
Supervisor:Danielsson, Rebecca
Examiner:Spörndly, Rolf
Series:UNSPECIFIED
Volume/Sequential designation:UNSPECIFIED
Year of Publication:2019
Level and depth descriptor:First cycle, G2E
Student's programme affiliation:VK001 Animal Science - Bachelor's Programme 180 HEC
Supervising department:(VH) > Dept. of Animal Nutrition and Management
Keywords:ekologi, grovfoder, kraftfoder, VFA, acidos, idisslare
URN:NBN:urn:nbn:se:slu:epsilon-s-10832
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-s-10832
Subjects:Animal husbandry
Animal physiology - Nutrition
Veterinary science and hygiene - General aspects
Language:English
Deposited On:09 Sep 2019 10:33
Metadata Last Modified:10 Sep 2019 01:00

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