The patho-physiology of Trypanosoma congolense in Scottish Blackface sheep : influence of diet on digestive function

Wassink G.J., Fischwick G., Parkins J., Gill M., Romney D.L., Richard Didier, Holmes P.H.. 1997. The patho-physiology of Trypanosoma congolense in Scottish Blackface sheep : influence of diet on digestive function. Animal Science, 64 : 127-137.

Autre titre : Patho-physiologie de Trypanosoma congolense chez le mouton écossais à face noire : influence du régime alimentaire sur la fonction digestive

Résumé : The influence of types of roughage, barley straw (diet B) versus lucerne hay (diet L), on the patho-physiology of a #T. congolense# infection was compared in eight pairs of Scottish Blackface male twin lambs. One animal of each twin pair was infected and the other used as a pair-fed control. Voluntary food intake, body weight, digestive function, various blood haematological and biochemical measurements were made. Voluntary organic matter intake decreased significantly after the #T. congolense# infection, the decrease being greater in the diet L group than in the diet B group lambs (P < 0.01). The apparent digestibility coefficients of crude protein and organic matter were significantly lower in the infected lambs (P < 0.01). Mean retention time of the roughage through the digestive tract in the animals given barley straw was significantly longer (P < 0.05) due to a lower rumen outflow rate constant (P < 0.01). Infection resulted in longer mean retention times (P < 0.01). Packed cell volume (PCV) was significantly lower before infection in the animals given diet B (P <0.01). After infection, diet (P < 0.01) had infection (P < 0.01) and an additive effect on PCV. The anaemia was both macrocytic (P < 0.05) and hypochromic (P < 0.01). Diet B resulted in higher plasma cholesterol (P< 0.05), but lower plasma urea (P < 0.01) and albumin (P < 0.01) concentrations before infection than diet L. The #T. congolense# infection significantly lowered plasma cholesterol (P < 0.01) and increased plasma urea (P < 0.01) concentrations compared with the uninfected controls. Plasma albumin concentrations decreased, but were more affecfed by nutrition (P < 0.01) than by infection (P < 0.05). It was concluded thant the patho-physiological effect of the #T. congolense# infection in the Scottish Blackface lambs were affected by the type of roughage offered, but that these effects were additive rather than interactive to the effects of infection.

Mots-clés Agrovoc : mouton, régime alimentaire, digestion, pathologie, Trypanosoma congolense

Classification Agris : L73 - Maladies des animaux
L02 - Alimentation animale
L51 - Physiologie animale - Nutrition

Auteurs et affiliations

• Wassink G.J.
• Fischwick G.
• Parkins J.
• Gill M.
• Romney D.L.
• Richard Didier, CIRAD-EMVT-DS (FRA)
• Holmes P.H.

Source : Cirad - Agritrop (https://agritrop.cirad.fr/389545/)

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