Premium
THE INFLUENCE OF GRAZING “IMMUNE COWS” ON THE LEVEL OF DICTYOCAULUS VIVIPARUS INFECTION ON PASTURE
Author(s) -
Baxter J. T.,
Allan D.,
Patterson J. T.
Publication year - 1959
Publication title -
grass and forage science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.716
H-Index - 56
eISSN - 1365-2494
pISSN - 0142-5242
DOI - 10.1111/j.1365-2494.1959.tb01033.x
Subject(s) - lungworm , grazing , larva , pasture , biology , zoology , feces , veterinary medicine , dry matter , agronomy , ecology , medicine
At the Agricultural Research Institute, Hillsborough, Northern Ireland, during September and October, 1958, a field which was naturally infected with Dictyocaulus viviparus (lungworm) larvae was divided and one part was intensively grazed by cows which were not excreting lungworm larvae while the other part remained unstocked. Records were kept of the available herbage, total dry matter and the numbers of larvae on both areas. Grazing resulted in a marked reducuon of the larval numbers which was greater, in proportion, than that of the amount or herbage. Although severe grazing did not remove the infection, it so accelerated the decline in numbers that an infection level of one larva per lb. herbage was reached 7 weeks earlier on the grazed than on the ungrazed area. The herbage in both areas showed no larvae about 4 months after infected faeces were last voided on to it.