A prediction model for strike in the sheep nasal fly, Oestrus ovis, in Namibia

Biggs, Harry; McClain, Elizabeth K.; Múller, G. L.; Anthonissen, M.; Hare, K.M

doi:10.1016/s0167-5877(97)00015-9

Cited by 16 publications

(11 citation statements)

References 7 publications

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“…Regarding larval and adult weight, sexual dimorphism has also been reported in Hypoderma tarandi and Cephenemyia trompe (Nilssen, 1997). The longevity of the adult flies obtained was short, not reaching 10 days (9.4 ± 3.8 days), but was similar to that obtained by Biggs et al (1998) caucasicus has a similar mortality rate and we add the rate obtained in the laboratory for the pupal stage, then we can estimate that only about a 0.3-3 % of larvae produced by gravid females will become adult flies. Oestrus ovis females lay about 500 eggs (Kettle, 1990).…”

Section: Note De Recherchesupporting

confidence: 79%

“…The pupal period of cattle grubs averaged 21.7 days in Hypoderma lineatum and 28.8 days in H. bovis (Pfadt et al, 1975) and was shown to increase as temperature decreased. According to Biggs et al (1998), an extended pupation time may prevent the emergence of adults under adverse climatic conditions. This phenomenon may be considered as an alternative strategy to the overwintering of first-instar larvae and as an external hypobiotic period as well (Tabouret et al, 2001).…”

Section: Note De Recherchementioning

confidence: 99%

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In vitrorearingOestrus caucasicusthird-instar larvae and pupae (Diptera: Oestridae) from naturally-infested Iberian ibex,Capra pyrenaica(Artiodactyla: Bovidae)

et al. 2006

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Summary :Third-instar Oestrus caucasicus larvae (n = 236) obtained from Iberian ibex, Capra pyrenaica, were reared in a laboratory to obtain adult flies. They were maintained at a temperature of 21.9 ± 2.7°C and a relative humidity of 38.9 ± 8.0 %. In all, 78 imagos emerged (33.1 %), with a sex-ratio at emergence not differing significantly from 1:1; 25 larvae did not complete pupariation. A total of 14 adult flies (17.9 % of the adults obtained) showed malformations, mainly in their wings. The pupariation period lasted around 30 hours and the pupal stage lasted on average 29.8 ± 6.8 days. The success of pupation in both sexes was mainly determined by the weight of the larvae. Sexual dimorphism, with higher weights in females, was evident in third-instar larvae, pupae and adults. The mean longevity of adult flies was 224.8 ± 91.4 hours and males generally survived for longer than the females. Résumé : CULTURE IN VITRO DE LARVES ET NYMPHES D'OESTRUS

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Section: Note De Recherchesupporting

confidence: 79%

Section: Note De Recherchementioning

confidence: 99%

In vitrorearingOestrus caucasicusthird-instar larvae and pupae (Diptera: Oestridae) from naturally-infested Iberian ibex,Capra pyrenaica(Artiodactyla: Bovidae)

et al. 2006

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“…A certain percentage of parasites may continue to develop in the host during the cold months and be expelled despite the low probabilities of survival in an extreme environment (Rogers andKnapp 1973 andBreev et al 1980). In this area (Gracia et al 2006), adult instars disappeared in the cold season (November to April), supporting the possibility that expelled parasites either die or remain outside by pupal diapause or an external hypobiotic period (Biggs et al 1998). However, it could also be that L3 are not expelled, but remain in the host.…”

Section: Discussionmentioning

confidence: 66%

Epidemiology of Oestrus ovis infection of sheep in northeast Spain (mid-Ebro Valley)

Lamelas

Lucientes

Peribáñez

et al. 2009

Trop Anim Health Prod

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Slaughterhouse surveys to determine the prevalence and intensity of larval Oestrus ovis Linnaeus (Diptera: Oestridae) in sheep, were conducted monthly for 1 year in northeastern Spain. The prevalence of O. ovis in 120 sheep in northeast Spain was 84.2%. The monthly prevalence ranged from 62.5% in January to 100% in June and October. Of the 3,831 larvae collected, 3,005 were first instar larvae (78.4%), 744 second instar larvae (19.4%), and 82 third instar larvae (2.1%). The mean larval burden per infected sheep was 37.9, throughout the year although infection was higher in October. The high number of first stage larvae in winter (especially October, November, and December) may be due to a period of slower larval maturation. Third-stage larvae were always present but sometimes in very low numbers compared to the total. According to the results, oestrosis appears to be a serious problem in the region.

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“…Extended pupariation outside has been observed for O. ovis by Biggs et al (1998) allowing adults flies to wait for the best time for emergence, mating and larviposition. Choosing the right place for burrowing and pupariation is of high importance in this species and extreme temperatures into the soil (for example above 40 • C for long periods) being lethal to pupae or leading to low adult weight with high post-emergence mortality rates (Cepeda Palacios et al, 1998).…”

Section: Larval Adaptation To Environmentmentioning

confidence: 99%