Poultry population dynamics and mortality risks in smallholder farms of the Mekong river delta region
| Autor: | Nguyen Thi Le Thanh, Ha Minh Lam, Benjamin Nguyen-Van-Yen, Huynh Thi Ai Xuyen, Phung Ngoc Tuyet, Maciej F. Boni, Alexis Delabouglise |
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| Rok vydání: | 2019 |
| Předmět: |
Veterinary medicine
animal diseases Population Dynamics Biosecurity Avian influenza Population biology L73 - Maladies des animaux medicine.disease_cause 0403 veterinary science Dynamique des populations Canard Veterinary epidemiology Animal Husbandry Smallholder farms 2. Zero hunger 0303 health sciences education.field_of_study lcsh:Veterinary medicine grippe aviaire hautement pathogène Population size Age Factors Livestock demography 04 agricultural and veterinary sciences General Medicine Poultry farming Southeast Asia Épidémiologie Ducks Vietnam Research Article Farms animal structures 040301 veterinary sciences Population Biology Système d'élevage Volaille Petite exploitation agricole Herd immunity 03 medical and health sciences medicine Animals education Poultry Diseases 030304 developmental biology General Veterinary business.industry L70 - Sciences et hygiène vétérinaires - Considérations générales Poultry production Influenza A virus subtype H5N1 lcsh:SF600-1100 Infectious diseases of poultry Flock business Chickens |
| Zdroj: | BMC Veterinary Research BMC Veterinary Research, Vol 15, Iss 1, Pp 1-13 (2019) |
| ISSN: | 1746-6148 |
| DOI: | 10.1186/s12917-019-1949-y |
| Popis: | Background Poultry farming is widely practiced by rural households in Vietnam and the vast majority of domestic birds are kept on small household farms. However, smallholder poultry production is constrained by several issues such as infectious diseases, including avian influenza viruses whose circulation remains a threat to public health. This observational study describes the demographic structure and dynamics of small-scale poultry farms of the Mekong river delta region. Method Fifty three farms were monitored over a 20-month period, with farm sizes, species, age, arrival/departure of poultry, and farm management practices recorded monthly. Results Median flock population sizes were 16 for chickens (IQR: 10–40), 32 for ducks (IQR: 18–101) and 11 for Muscovy ducks (IQR: 7–18); farm size distributions for the three species were heavily right-skewed. Muscovy ducks were kept for long periods and outdoors, while chickens and ducks were farmed indoors or in pens. Ducks had a markedly higher removal rate (broilers: 0.14/week; layer/breeders: 0.05/week) than chickens and Muscovy ducks (broilers: 0.07/week; layer/breeders: 0.01–0.02/week) and a higher degree of specialization resulting in a substantially shorter life span. The rate of mortality due to disease did not differ much among species, with birds being less likely to die from disease at older ages, but frequency of disease symptoms differed by species. Time series of disease-associated mortality were correlated with population size for Muscovy ducks (Kendall’s coefficient τ = 0.49, p-value |
| Databáze: | OpenAIRE |
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