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The West African Sahel rainfall regime is known for its spatio-temporal variability at different scales which has a strong impact on vegetation development. This study presents results of the combined use of a simple water balance model, a radiative transfer model and ERS scatterometer data to ...


Jarlan, L.Mazzega, P.Mougin, E.Lavenu, F.Marty, G.Frison, P.L.Hiernaux, Pierre H.Y.[Mapping of Sahelian vegetation parameters from ERS scatterometer data with an evolution strategies algorithm]Mapping of Sahelian vegetation parameters from ERS scatterometer data with an evolution strategies algorithm

The goal of this paper is to highlight the use and interpretation of statistical techniques that account for correlation in epidemiological data. A conceptual statistical background is provided, and the main types of regression models for correlated data are highlighted. These models include marg...


Schukken, Y.H.Grohn, Y.T.McDermott, B.McDermott, John J.[Analysis of correlated discrete observations: Background, examples and solutions]Analysis of correlated discrete observations: Background, examples and solutions

Breeding objectives were developed for meat sheep in smallholder production circumstances in the tropics. The traits considered were litter size, lambing frequency, pre-weaning, and post-weaning lamb survival to 12 months, ewe survival, lamb live weight at 12-month, mature ewe live weight, consum...


Kosgey, I.S.Arendonk, Johan A.M. vanBaker, R.L.[Economic values for traits of meat sheep in medium to high production potential areas of the tropics]Economic values for traits of meat sheep in medium to high production potential areas of the tropics

The objective of this study was to evaluate whether the efficacy of marker assisted selection (MAS) could be improved by considering a confidence interval (CI) of QTL position. Specifically, MAS was applied for within-family selection in a stochastic simulation of a closed nucleus herd. The locat...


Stella, A.Janson, G.B.Boettcher, P.J.Gibson, John P.Lohuis, M.M.Pagnacco, G.[Accounting for uncertainty in QTL location in marker-assisted pre-selection of young bulls prior to progeny test]Accounting for uncertainty in QTL location in marker-assisted pre-selection of young bulls prior to progeny test

Variance components and genetic parameters were estimated for growth traits: birth weight (BWT), weaning weight (WWT), 6-month weight (6MWT) and yearling weight (YWT) in indigenous Ethiopian Horro sheep using the average information REML (AIREML). Four different models: sire model (Model 1), dire...


Abegaz, S.Negussie, E.Duguma, G.Rege, J.E.O.[Genetic parameter estimates for growth traits in Horro sheep]Genetic parameter estimates for growth traits in Horro sheep

The genetic relationship between five Belgian breeds (Belgian Blue, Black Pied, Red Pied, White and Red of East Flanders, Red of West Flanders), an African taurine N'Dama breed and a captive American bison herd was studied by means of 31 microsatellite loci. On the basis of the allele frequencies...


Mommens, G.Peelman, L.J.Zeveren, A. vanD'Ieteren, G.D.M.Wissocq, N.M.[Microsatellite variation between an African and five European taurine breeds results in a geographical phylogenetic tree with a bison outgroup]Microsatellite variation between an African and five European taurine breeds results in a geographical phylogenetic tree with a bison outgroup

Animal manure is one of the principal sources of nutrients for soil fertility maintenance and crop production in semi-arid west Africa. Farm-level decisions concerning the use of manure are governed by socioeconomic and institutional factors, as much as they are by agronomic ecological concerns. ...


Williams, Timothy O.[Factors influencing manure application by farmers in semi-arid West Africa]Factors influencing manure application by farmers in semi-arid West Africa

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

ERS wind scatterometer (WSC) time series are analyzed over different ecoclimatic regions of the African Sahel during the period 1991–1995. At 45° incidence angle, the strong seasonality of o time series can be directly linked to the successive wet and dry seasons. Moreover, the annual o dynami...


Jarlan, L.Mougin, E.Frison, P.L.Mazzega, P.Hiernaux, Pierre H.Y.[Analysis of ERS wind scatterometer time series over Sahel (Mali)]Analysis of ERS wind scatterometer time series over Sahel (Mali)

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