Epidemiology and effects of gastrointestinal nematode infection on milk productions of dairy ewes

Parasite

M.R. Busetti¹  S.L. Cristel¹  V.H. Suarez¹ 

[1] INTA – Estación Experimental Agropecuaria de Anguil,CC 11,6326, Anguil, La Pampa,Argentina

关键词: Argentina;    Pampeana region;    milk yield;    nematode;    dairy sheep;   

Others  :  808410
DOI  :  doi:10.1051/parasite/2009162141

 received in 2008-11-03, accepted in 2009-02-10,  发布年份 2009

【 摘 要 】

66 Pampinta breed ewes were studied during milking to evaluate the infection and the effect of gastrointestinal nematode on milk production sheep system. Naturally infected ewes on pasture were randomly allocated to two groups: TG, suppressively treated group every four weeks with levamisole and UG, untreated group. Faecal nematode egg counts and larval differentiation were conducted monthly. Successive groups of worm free tracer lambs were grazed with ewes and then slaughtered for worm counts. Test-day milk yield of individual ewes was recorded and ewe machine-milking period length (MPL) were estimated. Faecal egg counts and tracer nematode numbers increased towards midsummer and declined sharply toward the end of the study. TG (188.0 ± 60 liters) produced more (p < 0.066) milk liters than UG (171.9 ± 52.2) and TG had significantly more extended (p < 0.041) MPL than those of UG. The present study showed that dairy sheep were negatively affected by worms, even when exposed to short periods of high acute nematode (mainly Haemonchus contortus) infection.

【 授权许可】

   
© PRINCEPS Editions, Paris, 2009