Efeitos da administração da folha de Nim Indiano (Azadirachta indica A. Juss) no controle de helmintos em ovinos infectados naturalmente / Effects of Indian Neem (Azadirachta indica A. Juss) leaf administration on Sheep Naturally Infected by Helminthes

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The objective of this study was to evaluate the effects of neem (Azadirachta indica) on natural helminth infection in lambs. Forty, four-month-old entire Santa Ines lambs, with average live weight of 11 2,7 kg were grazed on an Andropogon gayanus pasture, over a 20 week period. They were divided into four treatments: without drenching (ND), 3g A. indica/animal (A3), 6g A. indica/animal (A6) and 9g A. indica/animal (A9) over five consecutive days, with an interval of 28 days between drenchings. Faeces were collected weekly and lamb weight and blood collection were carried out fortnightly. Four weeks after the last drenching all lambs were slaughtered, and worm burdens calculated. No significant differences were observed for lamb performance between treatments. Only treatment A3 showed faecal egg counts (FEC) lower than treatment ND from the 12th week, although this was also not significant. Blood parameters highlighted the progress of the worm infections, with sheep on treatments A6 and A9 ending the experiment showing anemia. There was an increase in the total number of worms associated with increasing levels of neem, especially due to the increase in number of H contortus in detriment to the number of T. colubriformis for highest levels of neem (A6 and A9). The increasing doses of neem did not improve the control of endoparasites in sheep naturally infected, increasing the development of hemonchosis.

ASSUNTO(S)

nematode lambs ovine parasites ruminante ovino - doenças neem ciencias agrarias helminto - controle

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