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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
10/10/2002 |
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Data da última atualização: |
10/10/2002 |
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Autoria: |
GATONGI, P. M.; PRICHARD, R. K.; RANJAN, S.; GATHUMA, J. M.; MUNYUA, W. K.; CHERUIYOT, H.; SCOTT, M. E. |
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Título: |
Hypobiosis of Haemonchus contortus in natural infections of sheep and goats in a semi-arid area of Kenya. |
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Ano de publicação: |
1998 |
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Fonte/Imprenta: |
Veterinary Parasitology, v. 77, n. 1, p. 49-61, 1998. |
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Idioma: |
Inglês |
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Conteúdo: |
A total of 42 lambs, 42 kids, 21 ewes and 21 does were necropsied during an investigation of the epidemiology of Haemonchus contortus infection of sheep (Red Maasai) and goats (Small East African Goat in a semi-arid area of Kenya. Availability and establishment of the infective stages were monitored by the necropsy of 21 tracer lambs and 21 tracer kids. Prevalence of H. contortus was over 90% in both sheep and goats and this species contributed to about 80% of the total worm burden. Only about 10% of the hypobiotic larvae were recovered from the mucosal digest whereas about 90% were recovered from the abomasal contents and washings, thereby suggesting that hypobiotic larvae mar be loosely attached to the abomasal mucosa from which they mar be dislodged during the processing of the abomasa for examination. Throughout the study, both adult worms and hypobiotic larvae were found in proportions that varied with seasons. Statistically, a higher proportion of hypobiotic larvae was found during the dry months than during the wet months, an indication that hypobiosis was an important feature in the survival of H. contortus during the dry months. Negligible worm burdens were acquired by the tracers during the short rains, suggesting that few H. contortus larvae survived on pasture in this season. The effectiveness of strategic control using ivermectin varied according to the timing in relation to the wet season. Treatment did not influence the seasonal pattern of hypobiosis but the treatment L administered before the onset of the rains significantly reduced the numbers of both hypobiotic larvae and the adult worms. Treatment during the rains conferred a temporary relief of adult worm burden but had no impact on hypobiotic larvae. MenosA total of 42 lambs, 42 kids, 21 ewes and 21 does were necropsied during an investigation of the epidemiology of Haemonchus contortus infection of sheep (Red Maasai) and goats (Small East African Goat in a semi-arid area of Kenya. Availability and establishment of the infective stages were monitored by the necropsy of 21 tracer lambs and 21 tracer kids. Prevalence of H. contortus was over 90% in both sheep and goats and this species contributed to about 80% of the total worm burden. Only about 10% of the hypobiotic larvae were recovered from the mucosal digest whereas about 90% were recovered from the abomasal contents and washings, thereby suggesting that hypobiotic larvae mar be loosely attached to the abomasal mucosa from which they mar be dislodged during the processing of the abomasa for examination. Throughout the study, both adult worms and hypobiotic larvae were found in proportions that varied with seasons. Statistically, a higher proportion of hypobiotic larvae was found during the dry months than during the wet months, an indication that hypobiosis was an important feature in the survival of H. contortus during the dry months. Negligible worm burdens were acquired by the tracers during the short rains, suggesting that few H. contortus larvae survived on pasture in this season. The effectiveness of strategic control using ivermectin varied according to the timing in relation to the wet season. Treatment did not influence the seasonal pattern of hypobiosis but the t... Mostrar Tudo |
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Palavras-Chave: |
Infecção natural; Semi-árido. |
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Thesagro: |
Caprino; Haemonchus Contortus; Nematóide; Ovino. |
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Thesaurus Nal: |
Kenya. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02507naa a2200277 a 4500
001 1528657
005 2002-10-10
008 1998 bl uuuu u00u1 u #d
100 1 $aGATONGI, P. M.
245 $aHypobiosis of Haemonchus contortus in natural infections of sheep and goats in a semi-arid area of Kenya.
260 $c1998
520 $aA total of 42 lambs, 42 kids, 21 ewes and 21 does were necropsied during an investigation of the epidemiology of Haemonchus contortus infection of sheep (Red Maasai) and goats (Small East African Goat in a semi-arid area of Kenya. Availability and establishment of the infective stages were monitored by the necropsy of 21 tracer lambs and 21 tracer kids. Prevalence of H. contortus was over 90% in both sheep and goats and this species contributed to about 80% of the total worm burden. Only about 10% of the hypobiotic larvae were recovered from the mucosal digest whereas about 90% were recovered from the abomasal contents and washings, thereby suggesting that hypobiotic larvae mar be loosely attached to the abomasal mucosa from which they mar be dislodged during the processing of the abomasa for examination. Throughout the study, both adult worms and hypobiotic larvae were found in proportions that varied with seasons. Statistically, a higher proportion of hypobiotic larvae was found during the dry months than during the wet months, an indication that hypobiosis was an important feature in the survival of H. contortus during the dry months. Negligible worm burdens were acquired by the tracers during the short rains, suggesting that few H. contortus larvae survived on pasture in this season. The effectiveness of strategic control using ivermectin varied according to the timing in relation to the wet season. Treatment did not influence the seasonal pattern of hypobiosis but the treatment L administered before the onset of the rains significantly reduced the numbers of both hypobiotic larvae and the adult worms. Treatment during the rains conferred a temporary relief of adult worm burden but had no impact on hypobiotic larvae.
650 $aKenya
650 $aCaprino
650 $aHaemonchus Contortus
650 $aNematóide
650 $aOvino
653 $aInfecção natural
653 $aSemi-árido
700 1 $aPRICHARD, R. K.
700 1 $aRANJAN, S.
700 1 $aGATHUMA, J. M.
700 1 $aMUNYUA, W. K.
700 1 $aCHERUIYOT, H.
700 1 $aSCOTT, M. E.
773 $tVeterinary Parasitology$gv. 77, n. 1, p. 49-61, 1998.
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Embrapa Caprinos e Ovinos (CNPC) |
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