<span style="font-family: arial,helvetica;">The range and infestation intensities of gastrointestinal parasitic nematode species depend on the type of swine production system. The present study focused mainly on nematodes of veterinary importance in scavenging pigs in Burkina Faso, and aimed at determining the prevalence of gastro-intestinal nematode parasites by means of faecal egg per gram (EPG) counts. Between November 2001 and October 2002, faecal samples from 383 pigs of different sexes and ages (&lt; 5 months, 5-12 months and &gt; 12 months) were collected from the rectum and examined for gastrointestinal nematodes parasites using the Mc Master method. Of the 383 pigs examined, 91 % were infected by one or more para sites. <em>Ascaris suum</em> (40 %; 100-1 400 EPG) was the most prevalent parasite followed by <em>Strongyloides ransomi</em> (21 %; 100-4 200 EPG), <em>Oesophagostomum spp.</em> (18 %; 100-1 000 EPG), <em>Hyostrongylus rubidus</em> (11 %; 100-1 800 EPG), <em>Globocephalus spp.</em> 10 %; 100-400 EPG) and <em>Trichuris suis</em> (1 %; 100-200 EPG). The prevalence was significantly higher in female pigs (<em>n</em> = 239) than in males. In addition, females excreted significantly (<em>P</em> &lt; 0.05) more eggs in their faeces than males, except in the case of <em>Globocephalus spp.</em> The age of the animal had no effect on the prevalence of <em>A. suum</em> whereas there were significant differences in age categories concerning <em>S. ransomi, H. rubidus, Oesophagostumum spp</em>. and <em>Globocephalus spp.</em> Unexpectedly, the high prevalence of these common parasites was not accompanied by elevated EPG values, which suggests the existence of moderate infestations. The present work indicates that the common nematode infestations in pigs do not necessarily need a systematic herd anthelmintic treatment, as only a small number of worms is required to induce immunity. <br />A further study is needed to formulate appropriate and cost-effective strategies for the control of gastro-intestinal nematode parasites in pigs in Burkina Faso.</span>

RésuméCette étude a été menée dans les élevages périurbains et au niveau des marchés à bétail de Ouagadougou avec pour objectif de caractériser sur le plan phénotypique les petits ruminants de race locale “Mossi”. 314 animaux (202 ovins et 112 caprins) repartis chez 25 producteurs ont été concernés. Les mesures corporelles suivantes ont été effectuées: le poids vif (PV), le périmètre thoracique (PT), la hauteur au garrot (HG), la hauteur à la croupe (HC) et la longueur de la diagonale du corps (LDC). Ont été également enregistrées la présence ou non de cornes, de barbiche, la couleur de la robe (blanc, noir, noir et blanc, brun, blanc-brun) et la structure du poil (ras et dur, ras et lisse, long et dur, long et lisse).Les résultats ont mis en évidence entre les variables corporelles mesurées, des différences liées au sexe en fonction de l’âge. Les ovins locaux de type “Mossi” sont eumétriques avec un PV moyen à l’âge adulte de 23,3±5,0 kg et une HG de 59,3±5,5 cm. Chez les caprins, le PV moyen est de 20,2plusmn;4,5 kg et la HG est de 48,4±4,1 cm.Ce sont des types génétiques à robes multicolores avec cependant une prédominance de la couleur “noir et blanc” chez les ovins, “blanc-brun” chez les caprins. Le poil est généralement “ras et dur” chez les ovins et “ras et lisse” chez les caprins. Le port des oreilles est “dressé et court” chez les caprins et “tombant et court” chez les ovins.La grande variabilité notée pour la couleur de la robe et le PV chez les individus de ces races indique de grandes possibilités d'amélioration génétique par sélection.

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A total of 769 adult females belonging to 3 taurine and one zebu cattle populations sampled in 3 provinces of Burkina Faso were assessed for 19 body measurements during two different years (2014 and 2018). The aim of this research was to identify temporal morphological variation in cattle bred in the humid southern zones to obtain empirical evidence supporting a possible introgression of zebu cattle genes into Gourounsi and Lobi taurine cattle breeds. Zebu cattle samples were used as out-group for both 2014 and 2018 subsets. Least square means of body measurements allowed to classify Burkina Faso taurine cattle into three subgroups according to body size (Gourounsi–Sanguié –GourS-, Gourounsi-Nahouri –GourN- and Lobi from the tallest to the smallest respectively). Principal Component Analysis suggested that in 2014, taurine populations were structured. Dispersion map constructed using the two first factors informed that the GourS population was well separated from both the Lobi and the GourN, which, in turn, overlapped. However, in 2018 a strong signal of homogenization was identified, with GourN partially overlapping the other two populations. Linear Discriminant Analysis suggested that about 20% of both GourS and GourN individuals were reciprocally misclassified. Clues for such increase have been pointed out by MANOVA analysis. Although on 2014, Lobi cattle was clearly smaller than Gourounsi and both GourS and GourN populations showed clear differences on body traits, on 2018 it could be assessed an increase in size in Lobi cattle and a strong homogenization signal within Gourounsi cattle. Zebu cattle gene flow southwards in Burkina Faso is likely to have caused these changes, suggesting a fast erosion of taurine cattle genetic background. Keywords: Body traits, quantitative traits, Gourounsi cattle, Lobi, Burkina Faso.