Comparison of resistance of four genotypes of rams to experimental infection with Haemonchus contortus

Romjali, E.; Pandey, V. S.; Batubara, Aron; Gatenby, R. M.; Verhulst, A.

doi:10.1016/0304-4017(96)00940-5

Cited by 9 publications

(4 citation statements)

References 28 publications

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“…The higher parasitic load was observed in BBW population than BBH population in Bangladesh and YCW goat breed had the least parasitic load among four goat breeds in China. The variation in susceptibility to Haemonchus contortus expressed in term of FEC among breeds has been supported by previous studies of goat/sheep (Gray, 1995;Romjali et al, 1996;Pralomkarn et al, 1997;Costa et al, 2000;Chiejina and Behnke, 2011;McManus et al, 2014).…”

Section: Discussionsupporting

confidence: 54%

Variability in fecal egg count of Haemonchus contortus infection to native goat breeds of China and Bangladesh under natural grazing condition

et al. 2017

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Haemonchus contortus is a major gastrointestinal nematode affecting goat in China and Bangladesh like many countries in the world. The aim of this study was to evaluate the susceptibility of Haemonchus contortus infection in different goat breeds/populations in China and Bangladesh under the natural grazing condition. Fecal Egg of Haemonchus contortus was counted from 430 goats in both countries using McMasters technique. Body weight, Pack Cell Volume and Hemoglobin value were measured for Bangladeshi goats. Statistical analysis was done after transforming data into log10 (n+1), where n is the number of egg per gram feces and analysis of variance was done by using Generalized Linear Model procedures of computer package of SAS. Prevalence of parasite and Fecal Egg Count varied significantly (P<0.01) in all six goat populations. The highest prevalence (88.89%) of Haemonchus contortus infection was found in Enshi Black and the highest parasitic load (527.74 ±78.13 epg) was found in Chinese hybrid goat population. Most of the individuals, except Chinese hybrid goats, had Fecal Egg Count less than 300 epg. Fecal Egg Count between sexes within breed of goat did not differ significantly (P>0.05). Black Bengal goat in the hilly region of Bangladesh was the least susceptible to Haemonchus contortus infection in term of Fecal Egg Count. Our study suggests that Chinese goat breeds were more susceptible to Haemonchus contortus infection as compared to Black Bengal goat of Bangladesh under natural grazing condition. Further studies on immune-genetics aspects of goats might be helpful to find out the actual causes of such differences and to develop disease resistant breed of goat.Progressive Agriculture 27 (4): 473-481, 2016

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Section: Discussionsupporting

confidence: 54%

Variability in fecal egg count of Haemonchus contortus infection to native goat breeds of China and Bangladesh under natural grazing condition

et al. 2017

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“…Faecal egg counts are highly heritable in most of the sheep breeds which have been studied (Sreter et al 1994;Hohenhaus and Otteridge 1995;Bisset et al 1996) and its practical value has been demonstrated in a number of successful selective breeding programmes (Windon 1990;Gray 1991). There is good evidence that the same may be true of dairy goats in France (Richard et al 1990), fibre-producing goats of diverse genetic background in the Scottish Borders (Patterson et al 1996a, b) and the few tropical breeds of sheep and their crosses, which have been studied (Romjali et al 1996;Mugambi et al 1996;. However, data from the even fewer reported studies of tropical goat breeds are less conclusive.…”

Section: Discussionmentioning

confidence: 99%

“…For example, work in these two areas has resulted not only in the production of a number of candidate vaccines, such as the H. contortus gut membrane-derived glycoprotein antigen, H11 (Andrews et al 1995;Newton 1995;Munn et al 1997), but also in the identification of immunogenetic and parasitological parameters for the selection of parasite resistant breeds and blood lines for possible breed improvement schemes (Douch et al 1995;Bisset et al 1996;. Recent reports have also identified some parasiteresistant tropical breeds of sheep and goats and their crosses which may have a role to play in the control of PGE in small ruminants in the tropics (Mugambi et al 1996;Mugambi et al 1997;Romjali et al 1996;Mandonnet et al 1997). Of particular interest is the observation that resistant phenotypes can be identified in an out-bred and unselected flock under field conditions, using simple parameters such as faecal egg counts, circulating eosinophils and serum parasite-specific IgG and IgG1 levels (Hohenhaus and Outteridge 1995;Douch et al 1995).…”

mentioning

confidence: 99%

The response of Nigerian West African Dwarf goats to experimental infections withHaemonchus contortus

Fakae

Chiejina

Behnke

et al. 1999

Research in Veterinary Science

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“…Interestingly, these adaptive traits are also noteworthy when used for crossbreeding and are the dominant breed in the Caribbean islands, also having been exported to other countries like Mexico, Venezuela, the USA and Indonesia [82,83]. They can graze even at hot temperature and humidity, are able to survive on poor quality tropical grasses and possess better tolerance to gastrointestinal parasite infections that would severely affect other breeds even evolved from tropical regions [82,84]. Likewise, St. Croix sheep, native to the US, are adapted to a wide range of climatic environments ranging from hot humid climate of tropics (shedding hair during summer, which helps in efficient thermoregulation) and can also survive in cold temperatures (growing a thick wool coat in winter) [85].…”

Section: Genetic Differences In Heat Tolerance In Small Ruminantsmentioning

confidence: 99%

Resilience of Small Ruminants to Climate Change and Increased Environmental Temperature: A Review

Joy

Dunshea

Leury

et al. 2020

Animals

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Climate change is a major global threat to the sustainability of livestock systems. Climatic factors such as ambient temperature, relative humidity, direct and indirect solar radiation and wind speed influence feed and water availability, fodder quality and disease occurrence, with production being most efficient in optimal environmental conditions. Among these climatic variables, ambient temperature fluctuations have the most impact on livestock production and animal welfare. Continuous exposure of the animals to heat stress compromises growth, milk and meat production and reproduction. The capacity of an animal to mitigate effects of increased environmental temperature, without progressing into stress response, differs within and between species. Comparatively, small ruminants are better adapted to hot environments than large ruminants and have better ability to survive, produce and reproduce in harsh climatic regions. Nevertheless, the physiological and behavioral changes in response to hot environments affect small ruminant production. It has been found that tropical breeds are more adaptive to hot climates than high-producing temperate breeds. The growing body of knowledge on the negative impact of heat stress on small ruminant production and welfare will assist in the development of suitable strategies to mitigate heat stress. Selection of thermotolerant breeds, through identification of genetic traits for adaption to extreme environmental conditions (high temperature, feed scarcity, water scarcity), is a viable strategy to combat climate change and minimize the impact on small ruminant production and welfare. This review highlights such adaption within and among different breeds of small ruminants challenged by heat stress.

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Comparison of resistance of four genotypes of rams to experimental infection with Haemonchus contortus

Cited by 9 publications

References 28 publications

Variability in fecal egg count of Haemonchus contortus infection to native goat breeds of China and Bangladesh under natural grazing condition

Variability in fecal egg count of Haemonchus contortus infection to native goat breeds of China and Bangladesh under natural grazing condition

The response of Nigerian West African Dwarf goats to experimental infections withHaemonchus contortus

Resilience of Small Ruminants to Climate Change and Increased Environmental Temperature: A Review

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