A study of subclinical worm infestation in sheep: Part II. The ‘tolerance’ level of infestation
1957; Cambridge University Press; Volume: 49; Issue: 2 Linguagem: Inglês
10.1017/s0021859600036224
ISSN1469-5146
AutoresC. R. W. Spedding, T. H. Brown,
Tópico(s)Agriculture Sustainability and Environmental Impact
Resumo1. The live-weight gain of lambs initially infected at five different levels was compared with that of similar but worm-free animals, under conditions of set-stocking at a high rate per acre. 2. Over a period of 9 months the worm-free controls gained 67·7% more weight than the total infected group, but the live-weight gains of the five levels did not appear to be related to their original infection or to their egg counts. 3. Although a few nematode eggs were detected in the faeces of some control lambs, reinfection was negligible under the conditions of this experiment. 4. It was concluded that a marked depression of productivity may be associated with an egg count as low as 114 e.p.g. in sheep 4–7 months of age.
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