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Linear-multilevel models (LMM) are mixed-effects models in which several levels of grouping may be specified (village, herd, animal, ...). This study highlighted the usefulness of graphical methods in their analysis through: (1) the choice of the fixed and random effects and their structure, (2) ...


Lancelot, R.Lesnoff, MatthieuTillard, E.McDermott, John J.[Graphical approaches to support the analysis of linear-multilevel models of lamb pre-weaning growth in Kolda (Senegal)]Graphical approaches to support the analysis of linear-multilevel models of lamb pre-weaning growth in Kolda (Senegal)

A field experiment was carried out in Kolda (southern Senegal) from July 1986 to July 1988. Its goals were to: (1) describe the patterns of mortality of female Guinean goats by age, season and year; (2) assess preventive measures against respiratory diseases and gastrointestinal parasitism in red...


Lancelot, R.Lesnoff, MatthieuMcDermott, John J.[Use of Akaike information criteria for model selection and inference. An application to assess prevention of gastrointestinal parasitism and respiratory mortality of Guinean goats in Kolda, Senegal]Use of Akaike information criteria for model selection and inference. An application to assess prevention of gastrointestinal parasitism and respiratory mortality of Guinean goats in Kolda, Senegal

Contagious bovine pleuropneumonia (CBPP) is a major threat for cattle health and production in Africa. This disease is caused by the small-colony type of Mycoplasma mycoides subspecies mycoides (MmmSC). Transmission occurs from direct and repeated contacts between sick and healthy animals. Vete...


Lesnoff, MatthieuLaval, G.Bonnet, P.Abdicho, S.Workalemahu, A.Kifle, D.Peyraud, A.Lancelot, R.Thiaucourt, Francois[Within-herd spread of contagious bovine pleuropneumonia in Ethiopian highlands]Within-herd spread of contagious bovine pleuropneumonia in Ethiopian highlands

Demographic parameters are useful for assessing productivity and dynamics of tropical livestock populations. Common parameters are the annual instantaneous hazard rates, which can be estimated by m/T (where m represents the number of the considered demographic events occurred during the year and ...


Lesnoff, Matthieu[Evaluation of 12-month interval methods for estimating animal-times at risk in a traditional African livestock farming system]Evaluation of 12-month interval methods for estimating animal-times at risk in a traditional African livestock farming system

Periodic matrix population models are a useful approach to modelling cyclic variations in demographic rates. Caswell and Trevisan [1] introduced the perturbation analysis (sensitivities and elasticities) of the per-cycle population growth rate for such models. Although powerful, their method can...


Lesnoff, MatthieuEzanno, P.Caswell, H.[Sensitivity analysis in periodic matrix models: A postscript to Caswell and Trevisan]Sensitivity analysis in periodic matrix models: A postscript to Caswell and Trevisan

In developing countries, vaccination against highly pathogenic avian influenza subtype H5N1 (HPAI) in free-range poultry flocks is usually implemented as periodic campaigns and newborn chicks are generally not vaccinated by farmers between vaccination passes. The demographic population turnover l...


Lesnoff, MatthieuPeyre, M.Duarte, P.C.Renard, J.F.Mariner, Jeffrey C.[A simple model for simulating immunity rate dynamics in a tropical free-range poultry population after avian influenza vaccination]A simple model for simulating immunity rate dynamics in a tropical free-range poultry population after avian influenza vaccination

Contagious bovine pleuropneumonia (CBPP) is a respiratory disease of cattle caused by Mycoplasma mycoides subsmycoides small colony. CBPP has been and is still a major cause for concern for African countries (due to mortality, animal-production losses and cost of monitoring and control). A cross ...


Bonnet, P.Lesnoff, MatthieuThiaucourt, FrancoisWorkalemahu, A.Kifle, D.[Seroprevalence of contagious bovine pleuropneumonia in Ethiopian highlands (West Wellega zone, Bodji District)]Seroprevalence of contagious bovine pleuropneumonia in Ethiopian highlands (West Wellega zone, Bodji District)

Contagious bovine pleuropneumonia (CBPP) is a respiratory disease of cattle caused by Mycoplasma mycoides subsmycoides small colony. CBPP is a major cause for concern for African countries because of the associated mortality, production losses and cost of its control. Despite OIE's disapproval, a...


Lesnoff, MatthieuBonnet, P.Laval, G.Abdicho, S.[A simulation study of the effects of antibiotic treatment practices on the within-herd spread of contagious bovine pleuropneumonia in mixed crop-livestock system in Ethiopia]A simulation study of the effects of antibiotic treatment practices on the within-herd spread of contagious bovine pleuropneumonia in mixed crop-livestock system in Ethiopia

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