Increasing genetic resistance to gastrointestinal parasite infections in sheep would limit the use of drugs and the emergence of resistant parasites. However, this is a very complex trait. The identification of genomic areas associated with the trait is hindered by genotype–environment interactions. Therefore, it is necessary to obtain information from non-cosmopolitan sheep populations. Here, the West African Djallonké sheep genomic profile is analyzed to contribute to solve this gap.
The present study aimed at characterizing genetic diversity and relationship of 3 Niger cattle breeds (Zebu Arabe, Zebu Bororo and Kuri). High levels of allelic and gene diversity were observed while genetic differentiation was low. High genetic diversity and poor genetic structure might be due to historic zebu–taurine admixture and ongoing breeding practices in the region. The result of this study will help formulate effective strategies for conservation and improvement of Niger cattle breeds.
The long-horned Fulani zebu, spread all over the Sahel area, is one of the main cattle groups in Africa. Despite their importance, characterisation of these cattle is poorly developed. The current research illustrated a lack of differentiation among local populations of this cattle group at the body measurements level. Conservation or selection initiatives could be implemented at a cross-boundary level.
Body traits (16 body measurements and 18 qualitative traits) have been analysed in 183 adult sires belonging to nine West African cattle breeds via multifactorial methods to ascertain breeding preferences of African farmers. No clear patterns of homogenisation of the appearance of individuals within cattle breed could be assessed. Since no selection programmes exist and unsupervised matings are the rule, differentiation among African livestock breeds cannot be assessed in European terms.
Fatty acid composition in the intramuscular fat of the musculus longissimus dorsi of Ile de France purebred lambs in two production systems (lambs and ewes were assigned to pasture and fed without concentrates vs. lambs and ewes were assigned to a stable and fed with hay/silage and concentrates) was evaluated using gas chromatography. An analysis of variance was used for comparison. No such comparison had previously been carried out in Slovakia. Meat from lambs assigned to pasture was better.
In sheep production, the body condition scores and parities are important environmental factors affecting lamb yield. Extreme body condition scores (fattening state) lead to negative effects on lamb yield. In the present study, it was revealed that ewes with medium and fat body condition scores (BCS: 2.5–4.0) were profitable. It was shown that the body condition score had minimal effects on the birth weights of lambs, and the incidence of dystocia was increased in thin and very fat ewes.
The aim of this study was to perform a multivariate analysis of lambs' birth weight, survivability traits, growth performance traits, and other defined factors. The study focused on one flock of Suffolk sheep kept under permanent pasture management. Overall 1012 lambs were investigated over 3 years. The results of the study detected lambs' optimal birth weight for this management system. This study also suggested practical implications of important factors when improving flock profitability.
We aimed to evaluate the effects of premating ewe weight and age on ewe reproductive performance and lamb growth and survival in Central Anatolian Merino sheep. Multiple birth rate, birth weight, and growth performance of the lambs increased proportionally with the increase in live weight of the ewes prior to mating. Therefore, it is important to increase the live weight of lambs at puberty and to select ewes that attain a higher premating weight for breeding.
Dossa, L. H., Sangaré, M., Buerkert, A., and Schlecht, E.: Production objectives and breeding practices of urban goat and sheep keepers in West Africa: regional analysis and implications for the development of supportive breeding programs, SpringerPlus, 4, 1–12, https://doi.org/10.1186/s40064-015-1075-7, 2015.
Renard, J. F.: Filières de commercialisation et pauvreté: le cas des produits animaux au Burkina Faso, in: Elevage et pauvreté, acte de l'atelier CIRAD, Montpellier, 11–12 September 2003, edited by: Duteurtre, G. and Faye, B., CIRAD, Montpellier, France, 200 pp., 2003.
Tisdell, C.: Socioeconomic causes of loss of animal genetic diversity: analysis and assessment, Ecol. Econ, 45, 365–376, 2003.
Zoundi, J. S., Sawadogo, L., and Nianogo, A. J.: Pratiques et stratégies paysannes en matière de complémentation des ruminants au sein des systèmes d'exploitation mixte agriculture-élevage du plateau central et du Nord du Burkina Faso, Tropicultura, 21, 122–128, 2003.