References
- Anderson , N. , Armour , J. , Jarett , W. F. H. , Jennings , F. W. , Ritchie , J. S. D. and Urquhart , G. M. 1965 . A field study of parasitic gastritis in cattle . Vet. Rec. , 77 : 1196 – 1204 .
- Anderson , N. , Laby , R. H. , Prichard , R. K. and Hennessy , D. 1980 . Controlled release of anthelmintic drugs: a new concept for prevention of helminthosis in sheep . Res. vet. Sci. , 29 : 333 – 341 .
- Brunsdon , R. V. 1972 . Inhibited development of Ostertagia spp and Cooperia spp in . naturally acquired infections in calves. N.Z. vet. J. , 20 : 183 – 189 .
- Brunsdon , R. V. 1973 . The potential role of pasture management in the control of trichostrongyle worm infection in calves with observations on the diagnostic value of plasma pepsinogen determinations . N.Z. vet. J. , 21 : 214 – 220 .
- Hirschowitz , B. I. 1955 . Pepsinogen in the blood . J. Lab. clin. Med. , 46 : 568 – 579 .
- Korot’ko , G. F. and Islyamova , M. E. 1963 . Determination of the proteolytic activity of gastric juice, urine and serum . Sb. Nauch. Tr. Andzhansk Med. Inst. , 4 : 114 – 126 .
- Vlassoff , A. 1973 . Seasonal incidence of infective trichostrongyle larvae on pastures grazed by lambs . N.Z. J. exp. Agric. , 1 : 293 – 301 .