Caractérisation de la race bovine Somba à l’aide de marqueurs moléculaires

Goudarzi, Katayoun Moazami; Belemsaga, Désiré; Ceriotti, G.; Laloë, Dénis; Fagbohoum, F.; Kouagou, N. T.; Sidibé, Issa; Codjia, V.; Crimella, M. C.; Grosclaude, F.; Touré, Saydil

doi:10.19182/remvt.9791

Cited by 32 publications

(61 citation statements)

References 33 publications

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“…This is evident by the distribution of group specific microsatellite alleles, especially Indian zebu specific and African taurine specific alleles in these breeds. Some of the Indian zebu diagnostic loci/alleles observed in this study have been previously described [22,25,30]. Alleles at the diagnostic loci ETH152 and HEL1 described by MacHugh et al [25] are the same observed here except ETH152 193 and HEL1 111 .…”

Section: Discussionsupporting

confidence: 81%

“…Genetic diversity of African zebu breeds is higher than the values reported for most European taurine breeds [17,22,25] and Indian zebu breeds [22,25], and compares to reports on other African Bos indicus breeds [25,30], breeds in Turkey, and the Near East [22] and Korean and Chinese cattle [20]. Loftus et al [22] interpreted high gene diversity in the Near Eastern breeds as having resulted from a retention of a high number of alleles by populations in a center of origin and also an influence from Indian zebu breeds.…”

Section: Discussionmentioning

confidence: 56%

“…European taurine diagnostic allele 113 bp of HEL1, a locus also considered by MacHugh [24], was completely absent in all the African taurines and Indian zebus in this study, and only present in one African zebu breed at a low frequency of 0.021. African taurine specific allele INRA37 114 described by Moazami-Goudarzi et al [30] was absent in the Namchi and N'Dama breeds and occurred at a low frequency (3.1%) in the Muturu breed. This allele was consequently not considered African taurine specific in this study.…”

Section: Discussionmentioning

confidence: 84%

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Genetic diversity, introgression and relationships among West/Central African cattle breeds

et al. 2004

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-Genetic diversity, introgression and relationships were studied in 521 individuals from 9 African Bos indicus and 3 Bos taurus cattle breeds in Cameroon and Nigeria using genotype information on 28 markers (16 microsatellite, 7 milk protein and 5 blood protein markers). The genotypes of 13 of the 16 microsatellite markers studied on three European (German Angus, German Simmental and German Yellow) and two Indian (Nelore and Ongole) breeds were used to assess the relationships between them and the African breeds. Diversity levels at microsatellite loci were higher in the zebu than in the taurine breeds and were generally similar for protein loci in the breeds in each group. Microsatellite allelic distribution displayed groups of alleles specific to the Indian zebu, African taurine and European taurine. The level of the Indian zebu genetic admixture proportions in the African zebus was higher than the African taurine and European taurine admixture proportions, and ranged from 58.1% to 74.0%. The African taurine breed, Muturu was free of Indian zebu genes while its counter Namchi was highly introgressed (30.2%). Phylogenic reconstruction and principal component analysis indicate close relationships among the zebu breeds in Cameroon and Nigeria and a large genetic divergence between the main cattle groups -African taurine, European taurine and Indian zebu, and a central position for the African zebus. The study presents the first comprehensive information on the hybrid composition of the individual cattle breeds of Cameroon and Nigeria and the genetic relationships existing among them and other breeds outside of Africa. Strong evidence supporting separate domestication events for the Bos species is also provided.

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Section: Discussionsupporting

confidence: 81%

Section: Discussionmentioning

confidence: 56%

Section: Discussionmentioning

confidence: 84%

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Genetic diversity, introgression and relationships among West/Central African cattle breeds

et al. 2004

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“…Using such methods may result in a non consensus representation, due to the incongruence among markers [50]. Weak congruence could also explain some of the low bootstrap values which are typically reported in several studies in the following species: beef cattle [13,43,45,47,51,67], goats [35,42], sheep [63,70], and natural populations, such as white-tailed deer [20].…”

Section: Introductionmentioning

confidence: 99%

Consensus genetic structuring and typological value of markers using multiple co-inertia analysis

et al. 2007

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-Working with weakly congruent markers means that consensus genetic structuring of populations requires methods explicitly devoted to this purpose. The method, which is presented here, belongs to the multivariate analyses. This method consists of different steps. First, single-marker analyses were performed using a version of principal component analysis, which is designed for allelic frequencies (%PCA). Drawing confidence ellipses around the population positions enhances %PCA plots. Second, a multiple co-inertia analysis (MCOA) was performed, which reveals the common features of single-marker analyses, builds a reference structure and makes it possible to compare single-marker structures with this reference through graphical tools. Finally, a typological value is provided for each marker. The typological value measures the efficiency of a marker to structure populations in the same way as other markers. In this study, we evaluate the interest and the efficiency of this method applied to a European and African bovine microsatellite data set. The typological value differs among markers, indicating that some markers are more efficient in displaying a consensus typology than others. Moreover, efficient markers in one collection of populations do not remain efficient in others. The number of markers used in a study is not a sufficient criterion to judge its reliability. "Quantity is not quality".congruence / multiple co-inertia analysis / biodiversity / microsatellite / allelic frequencies

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“…It is at this level that may be encountered cases of miscegenation as highlighted Moazimi et al (2001), andDossa (2000). In family breeding crossbreeding is rare.…”

Section: The Herds' Managementmentioning

confidence: 98%

Zootechnical study of breeding modes of Somba cattle in Benin

China¹,

Adenile²,

Allou³

et al. 2014

Int. J. Bio. Chem. Sci

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The Somba cattle (Bos Taurus brachyceros sp), located in Benin and Togo, has a severe reduction of its livestock in recent decades. The aim of this study was to determine the causes of this phenomenon, in order to propose new approaches of conservation. The study consisted of surveys with targeted farmers and cattle. The results indicate that Somba cattle are not cared for both in terms of food and health, justifying its low performance and high mortality rate. The parameters covered by the study vary from one mode of farming to another. For individual parameters, entrusted farming is more interesting. In more than 80% of the farms of this mode, age at first calving is around 36 months, whereas it is of 42 months in the home farming, and have an inter calving period of 14 months which is also less than 24 months in the second case. Demographic parameters seem more interesting than home farming. Then, the mortality rate is 13.46% in home farming against 16.61% in entrusted farming. Regarding to external factors, health monitoring is lax in both modes. Food is a great concern especially during the dry season. The absorption by zebu was often mentioned as the main cause of the decrease of Somba cattle livestock. The present study shows that high mortality due to an absence of health monitoring is the basis of the sharp decline in the number of Somba cattle. The influence of zebu is currently marginal because 96.22% of cattle at the farm level respondents are Somba breed.

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Caractérisation de la race bovine Somba à l’aide de marqueurs moléculaires

Cited by 32 publications

References 33 publications

Genetic diversity, introgression and relationships among West/Central African cattle breeds

Genetic diversity, introgression and relationships among West/Central African cattle breeds

Consensus genetic structuring and typological value of markers using multiple co-inertia analysis

Zootechnical study of breeding modes of Somba cattle in Benin

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