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Epidemiological studies on gastro-intestinal nematode infections in chickens

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Epidemiological studies on gastro-intestinal nematode infections in chickens (English shop)

On farm establishment, host genetics and fluctuations in nematode egg excretion

Kalyakorn Wongrak (Author)

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ISBN-13 (Hard Copy) 9783954048182
ISBN-13 (eBook) 9783736948181
Language English
Page Number 120
Lamination of Cover glossy
Edition 1. Aufl.
Publication Place Göttingen
Place of Dissertation Göttingen
Publication Date 2014-09-29
General Categorization Dissertation
Departments Agricultural science
Forest science
Keywords poultry, free-range, mobile stall, nematode infections, mortality rate, parasitology, genetics, egg excretion, faecal collection, natural and experimental infections, Kalyakorn Wongrak
Description

The study results indicated a high prevalence (>99%) of nematode infections with the most prevalent species beingthe caecal worm Heterakis gallinarum (98.5%), followed by the roundworm Ascaridiagalli(96.2%) and the hairworms Capillaria spp. (86.1%). Capillaria spp. were composed of C. obsignata, C. caudinflataand C. bursata. It can be concluded that chickens kept in free-range systems are exposed to a higher risk of nematode infections, even if the animals are kept in a rotational system and/or in small herd sizes. However, no obvious link between high mortality rates and nematode infections could be determined. The high genetic correlation between counts of closely related worm species (e.g., A. galliand H. gallinarum) may indicate the existence of similar/same genetically determined mechanism(s) for controlling these nematodesin chickens. High heritabilities for total worm burden suggest that it is feasible to select hens for nematode resistance. Nematode egg excretion in both naturally occurring and experimental infections follows repeatable diurnal fluctuations which may indicate adaptive strategies of the nematodes to both internal and external environmental factors. Since the analytic sensitivity of egg counts suffers from low faecal egg concentrations, results from the present study suggests that faeces samples taken during daytime hours have a higher diagnostic value.