Effect of breed and season on production and response to infections with gastro-intestinal nematode parasites in sheep in the highlands of Ethiopia

Rege, J.E.O.; Tembely, S.; Mukasa-Mugerwa, E.; Sovani, S.; Anindo, D.O.; Lahlou-Kassi, A.; Nagda, S.M.; Baker, R. L.

doi:10.1016/s0301-6226(02)00088-x

Cited by 23 publications

(12 citation statements)

References 26 publications

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“…Menz and Horro sheep exposed to natural pasture challenge in the central highlands of Ethiopia showed no difference in resistance to endoparasites Tembely et al, 1998;Rege et al, 2002). However, under artificial challenge there was some evidence that the Menz may be more resistant than Horro lambs (Haile et al, 2002).…”

Section: Parasitic Diseasesmentioning

confidence: 93%

Genetics of adaptation in domestic farm animals: A review

Mirkena

Duguma

Haile³

et al. 2010

Livestock Science

153

113

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Section: Parasitic Diseasesmentioning

confidence: 93%

Genetics of adaptation in domestic farm animals: A review

Mirkena

Duguma

Haile³

et al. 2010

Livestock Science

153

113

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“…Related information on the mating/lambing management of the experimental flock has been summarised by Rege et al (2002).…”

Section: Reproduction Health and Nutrition Managementmentioning

confidence: 99%

On-station characterisation of indigenous Menz and Horro Sheep breeds in the central highlands of Ethiopia

Tibbo¹,

Ayalew²,

Awgichew

et al. 2004

Anim. Genet. Resour. Inf.

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On-station characterisation of indigenous Menz (n = 1 639) and Horro (n = 1 135) sheep of Ethiopia in the central highlands of the country was undertaken between 1992 and 1997 at the Debre Berhan Research Station of the International Livestock Research Institute (ILRI) to study the phenotypic characteristics of the breeds. Body weights, linear body measurements, and testicular parameters were studied. The traits studied were live body weights (LWT), body length (BL), heart girth (HG), height at withers (WH), pelvic width (PW), chest depth (CD), distance between last rib and tuber coxae (DLP-ATR), scrotal circumference (SC), testicular diameter (TD), testicular length (TL), and epididymal tail diameter (ED). All except LWT (which was also measured at birth) were measured at 3, 12 and 24 months age. Fixed effects included in the analyses were breed, sex, birth type, birth season, birth year, and significant first-order interactions.The Horro sheep had significantly (P<0.05) larger LWT at all ages than the Menz by as much as 6 to 18%. In both breeds, lambs born single were significantly (P<0.05) heavier than those born as twins or triplets. In all age categories and both breeds, males were consistently heavier and larger in size than females. Except for lambs of una medida testicular mayor (P<0,05) respecto a la raza Menz.

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“…Gastrointestinal nematode parasites remain one of the major constraints to small ruminant production in the tropics (Over et al, 1992). These infections are often identified as the main cause of mortality in sheep (Rege et al, 2002;Nguti et al, 2003) and in goat (Aumont et al, 1997b;Githigia et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Mortality of Creole kids during infection with gastrointestinal strongyles: A survival analysis1

Mandonnet

Ducrocq

Arquet

et al. 2003

Journal of Animal Science

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Mortality due to strongyles infection in small ruminants is a critical component of flock productivity in a tropical climate. In goat production, few experiments have been conducted to estimate the variability of this trait. A survival analysis study was carried out in the Creole experimental flock of INRA-Gardel (Moule, Guadeloupe) to identify management and genetic factors influencing mortality of kids reared at pasture and infected with gastrointestinal strongyles, predominantly Haemonchus contortus and Trichostrongylus colubriformis. Survival curves from 3 and 11 mo of age were analyzed for 837 kids sired by 48 bucks and 250 does. The causes of death were recorded. Mortality due to gastrointestinal strongyles was the variable considered. The flock management included drenchings with levamisole every 8 wk. Fecal egg counts and packed cell volume were regularly measured after 7 wk of natural infection. All but 6.7% of the records were uncensored, with an average failure time of 165 d. The probability of death following gastrointestinal infection was more than three times greater in males than in females. Kids raised by their mother before weaning had a lower (P < 0.05) relative risk of dying than those reared in nursery (0.40 vs. 1). Parity of the dam and litter size effects were not significant. The risk of death was reduced by approximately 80% during the 3 wk that followed a drenching (P < 0.01). Risk decreased by about 25% for each additional kilogram of body weight at weaning. Live weight, fecal egg counts, and packed cell volume all had significant effects on risk of death when introduced as time-dependent covariates in the model (P < 0.0001 for live weight and packed cell volume, and P < 0.01 for fecal egg counts). The estimated genetic variability was small and inaccurate. These results demonstrated that risk of death from gastrointestinal infection could be reduced with appropriate flock management. High infection levels increased the risk of death, but they were not the direct cause. The important mediation of reduced body weight and anemia in likelihood of death is highlighted. More data are needed to better assess the possibility for genetic improvement of viability in Creole kids during gastrointestinal strongyle infection.

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Effect of breed and season on production and response to infections with gastro-intestinal nematode parasites in sheep in the highlands of Ethiopia

Cited by 23 publications

References 26 publications

Genetics of adaptation in domestic farm animals: A review

Genetics of adaptation in domestic farm animals: A review

On-station characterisation of indigenous Menz and Horro Sheep breeds in the central highlands of Ethiopia

Mortality of Creole kids during infection with gastrointestinal strongyles: A survival analysis1

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