Genetic diversity of South African dairy goats for genetic management and improvement

Bosman, Lydia; Marle-Köster, E. van; Visser, Carina

doi:10.1016/j.smallrumres.2014.12.003

Cited by 10 publications

(17 citation statements)

References 14 publications

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“…The results corresponded with that of the previous study, with relatively high gene diversity estimates within the breeds. A 30% co-ancestry was calculated between the breeds, supporting the previous findings [48] regarding admixture.…”

Section: Dairy Goatssupporting

confidence: 87%

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The Development and Genetic Improvement of South African Goats

Visser¹,

Marle-Köster²

2018

Goat Science

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South Africa has a thriving goat industry, consisting of fiber, meat and dairy-producing goat breeds. These animals play an important role in terms of food security, socioeconomic welfare and cultural well-being. The South African goat industry is differentiated into a formal, commercial market with niche products such as mohair, chevon and goat's cheeses versus the informal, mainly meat-producing sector serving communal and smallholder farmers. Exotic and locally improved breeds, i.e., Angora, Saanen and Boer goats mainly serve the commercial industries, whereas the unimproved veld goat populations are well adapted in the resource-poor environments. Genetic improvement has historically been limited to the commercial breeds, but poor participation in animal recording and improvement schemes have resulted in slow genetic progress, with the exception of the Angora goat. Molecular research has opened up new possibilities for genetic characterization, preservation and utilization of the unique genetic resources retained by these animals.

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Section: Dairy Goatssupporting

confidence: 87%

“…The genetic diversity of SA dairy goats was investigated using a panel of 25 microsatellite markers [48]. High levels of diversity were estimated in all three breeds, with heterozygosity values exceeding 60%.…”

Section: Dairy Goatsmentioning

confidence: 99%

The Development and Genetic Improvement of South African Goats

Visser¹,

Marle-Köster²

2018

Goat Science

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“…This was confirmed by Bosman et al (2015), which indicates moderate genetic variation in South African dairy goats with a low risk of inbreeding. The low positive F ST values observed in this study indicated little genetic differentiation among the three dairy goat populations, with a slightly moderate genetic differentiation between Saanen and Toggenburg.…”

Section: Discussionmentioning

confidence: 63%

Genetic polymorphism of CSN1S2 in South African dairy goat populations

Grobler¹,

Visser²,

Chessa³

et al. 2017

SA J. An. Sci.

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Alpha-s 2 casein has a significant influence on protein content in goat milk, and the technological properties important for cheese processing. Specific alleles (A, B, C, E and F) of the alpha (α) s2 -casein gene (CSN1S2) result in higher protein, casein and fat content, and improved coagulation properties, which are useful for improved cheese making. The aim of this study was to investigate the polymorphism and genetic variation of CSN1S2 in South African dairy goats, using DNA sequencing technology. Sixty dairy goats (20 Saanes, 20 British Alpine, and 20 Toggenburg) and 20 meat-type goats were sequenced with four primers to distinguish among the seven known alleles for α s2 -casein. A total of four alleles (A, B, C and F) for CSN1S2 were observed among the dairy-and meat-type populations with ten genotypes across the populations. The A allele and the AA genotype were the most frequent across the populations, with the favourable AC genotype being the most frequent (0.300) in the Saanen population. Two unique genotypes were detected in the Toggenburg (BB and BF) and one in the meat-type goats (CF). The results indicate moderate genetic variation for α s2 -casein in the South African goat populations (42.3-63.6%). Low positive F ST values suggest limited inbreeding. This study confirmed the presence of favourable alleles in the South African goat populations, indicating room for genetic improvement using directional selection for favourable genotypes.

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“…Previous studies of indigenous Brazilian breeds showed large variation in numbers of alleles, with averages varying from 3.5 to 9.6 (Araújo et al, 2006;Menezes et al, 2006). For Britsh Alpine goats, mean number of microsatellite alleles was earlier found to be 6.84 ± 2.08 (Bosman et al, 2015). Highly polymorphic microsatellite markers are critical for genetic variation analysis in conservation genetic studies, as the presence of multiple alleles within a locus is an indication of variation, which in turn ensures a set of representative data.…”

Section: Discussionmentioning

confidence: 94%

Genetic diversity and relatedness between Canindé and British Alpine goat breeds in Northeastern Brazil accessed by microsatellite markers

et al. 2017

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ABSTRACT. The aim of this study was to access the genetic diversity and relatedness between Canindé and British Alpine goat breeds in the States of Piauí and Ceará using microsatellite markers. Genomic DNA was isolated from hair samples of 99 goats belonging to six different flocks. A panel of polymorphic heterologous microsatellite loci was used to genotype individuals. The microsatellite markers resulted in a total number of 145 alleles, with an average of 8.5 alleles per locus. The observed and expected heterozygosities were ≥0.687 and ≥0.627, respectively, for all loci. The polymorphic information content showed that all loci were highly informative with an overall mean of 0.757. Overall F ST across all populations and loci was 18%, which was consistent with the coefficient of gene differentiation (G ST = 0.104). AMOVA revealed that 12.8% of the variation was captured between breeds. The Bayesian STRUCTURE clustering detected the maximum likelihood for a model of two genetically distinct groups, in agreement with the number of predefined studied breeds and the two-dimensional plot from the PCoA analysis. The exotic British Alpine breed and the naturalized Brazilian Canindé breed were clearly differentiated by the microsatellite markers, indicating that these two breeds have distant genetic identities, despite the phenotypic similarity.

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Genetic diversity of South African dairy goats for genetic management and improvement

Cited by 10 publications

References 14 publications

The Development and Genetic Improvement of South African Goats

The Development and Genetic Improvement of South African Goats

Genetic polymorphism of CSN1S2 in South African dairy goat populations

Genetic diversity and relatedness between Canindé and British Alpine goat breeds in Northeastern Brazil accessed by microsatellite markers

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