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Evaluation of the Effects of Nematode Parasitism on Grazing Behaviour, Herbage Intake and Growth in Young Grazing Cattle by A.B Forbes; C.A Huckle; M.J Gibb; A.J Rook; R Nuthall is a Immunology and Microbiology article available to read on EtoBox.

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Parasitic nematodes, even in the absence of any clinical disease, can cause a reduction in voluntary feed intake in housed ruminants. This trial examined these effects on young cattle grazing pastures. Twenty dairy heifer calves, born in the previous autumn, were blocked according to liveweight and allocated to one of two groups: either untreated or dosed with an IVOMEC ® (ivermectin) SR Bolus 10 days prior to turnout on 1 May 1998. The groups grazed separately on two paddocks on predominately ryegrass swards. Liveweights were recorded every 28 days and faecal samples taken for worm egg counts at the same time. In mid-May and mid-July, for two 14-day periods, animals were paired within treatment groups and transferred to one of 10 replicate paddocks of similar sward height and herbage mass. Grazing behaviour and herbage intake were measured during these periods. In mid-May, 2 weeks after turnout, treated and untreated animals showed no difference in grazing behaviour or daily intake of grass. By mid-July, 10 weeks after turnout, the untreated heifers spent on average 105 min less per day in grazing time and their daily herbage intake was 0.78 kg dry matter (DM) per day lower than t

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Author

A.B Forbes; C.A Huckle; M.J Gibb; A.J Rook; R Nuthall

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0304-4017)

Published

2000

Language

EN

Field

Immunology and Microbiology (Life Sciences)