Nitrogen transactions along the digestive tract of lambs concurrently infected with Trichostrongylus colubriformis and Ostertagia circumcincta

摘要: Twelve lambs, paired on the basis of live weight, were cannulated in abomasum, proximal jejunum approximately 4 m distal to pylorus and terminal ileum. Six infected with 3000 Trichostrongylus colubriformis Ostertagia circumcincta larvae each day for 18 weeks remainder pair-fed individual lambs. All animals offered ryegrass (Lolium perenne)-white clover (Trifolium repens) pasture, cut daily. Dry matter (DM) intake, faecal egg concentration, plasma pepsinogen protein concentrations measured weekly. During 7 17 after commencement infection, flow digesta along gastrointestinal tract was together enteric loss true digestion absorption 125I-labelled albumin small intestine. DM intake depressed by parasitism, being 1331, (SE 70), 423 32) 529 52) g/d during 3, respectively. The nitrogen at faeces increased parasitism week abomasum ileum 17. Plasma protein-N (g/d) into 0.68 0.091) 1.97 0.139) 7, 0.85 0.158) 1.96 0.396) 17, control sheep True intestine, site very low (mean 0.08) not affected parasitism. Between high 0.87) again It calculated that total increase endogenous passing from as a result comprised only percentage (10-36%). major proportion occurred intestine beyond infection infection.