Wool quantitative trait loci in Merino sheep

Bidinost, F.; Roldan, D.L.; Dodero, A. M.; Cano, Eduardo; Taddeo, H.; Mueller, J. P.; Poli, M. A.

doi:10.1016/j.smallrumres.2007.04.005

Cited by 26 publications

(25 citation statements)

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“…QTL detected As mentioned previously, 8 of the 10 paternal half-sib families analysed here had been used in an initial QTL detection project focusing on OAR3, OAR4, OAR11 and OAR25 (Bidinost et al, 2008). In that study, QTLs for wool traits were found on OAR3 (for FD 1 ), on OAR4 (for GFW 2 and CFW 2 ), and on OAR25 (for YLD 1 , YLD 2 and CVFD 2 ).…”

Section: Multiple Trait Methodsmentioning

confidence: 90%

“…Eight paternal half-sib families had been used in an initial analysis with 6, 4, 4 and 3 microsatellites (MS) on sheep chromosomes (OAR) OAR3, OAR4, OAR11 and OAR25, respectively (Bidinost et al, 2008). Additional genotypes were generated in two steps: first, two new paternal families were genotyped for these 17 MS. Second, the whole population was genotyped for nine markers on OAR1 and 14 additional markers on four regions of interest based on the previous results.…”

Section: Markers and Genotypingmentioning

confidence: 99%

“…A few were based on experimental crosses between breeds: Romney 3 Merino cross (Rogers et al, 1994), Merino 3 Romney backcross (Henry et al, 1998) and Sarda 3 Lacaune backcross (Allain et al, 2006). Others used a single breed such as the INRA401 breed (Ponz et al, 2001) or the Merino breed (Bidinost et al, 2008). All these experiments were analysed assuming the segregation of a single QTL controlling a single trait in each linkage group.…”

Section: Introductionmentioning

confidence: 99%

“…On the whole, the precision of QTL mapping was low and the number, effect and location of QTL controlling the traits remain unclear. In an attempt to confirm and improve the identification a Present address: INRA-SAGA Auzeville BP 52627; 31326 Castanet Tolosan Cedex, France -E-mail: droldan@cnia.inta.gov.ar of QTLs that affect wool in sheep, in this study, we extended the analysis performed by Bidinost et al (2008) in a QTL experiment on Merino sheep, by two additional families and genotype markers. Further, we tested three hypotheses: a single QTL controlling a single trait (using regression models); two linked QTLs controlling a single trait and a single QTL controlling more than one trait (using regression ML approach).…”

Section: Introductionmentioning

confidence: 99%

“…Further detailed information relating to these phenotypic measures and the DNA extraction and genotyping procedures can be found in Bidinost et al (2008).…”

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confidence: 99%

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Merino sheep: a further look at quantitative trait loci for wool production

Roldan¹,

Dodero²,

Bidinost

et al. 2010

Animal

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A quantitative trait loci (QTL) analysis of wool traits from experimental half-sib data of Merino sheep is presented. A total of 617 animals distributed in 10 families were genotyped for 36 microsatellite markers on four ovine chromosomes OAR1, OAR3, OAR4 and OAR11. The markers covering OAR3 and OAR11 were densely spaced, at an average distance of 2.8 and 1.2 cM, respectively. Body weight and wool traits were measured at first and second shearing. Analyses were conducted under three hypotheses: (i) a single QTL controlling a single trait (for multimarker regression models); (ii) two linked QTLs controlling a single trait (using maximum likelihood techniques) and (iii) a single QTL controlling more than one trait (also using maximum likelihood techniques). One QTL was identified for several wool traits on OAR1 (average curvature of fibre at first and second shearing, and clean wool yield measured at second shearing) and on OAR11 (weight and staple strength at first shearing, and coefficient of variation of fibre diameter at second shearing). In addition, one QTL was detected on OAR4 affecting weight measured at second shearing. The results of the single trait method and the two-QTL hypotheses showed an additional QTL segregating on OAR11 (for greasy fleece weight at first shearing and clean wool yield trait at second shearing). Pleiotropic QTLs (controlling more than one trait) were found on OAR1 (clean wool yield, average curvature of fibre, clean and greasy fleece weightand staple length, all measured at second shearing).

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Section: Multiple Trait Methodsmentioning

confidence: 90%

Section: Markers and Genotypingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Further detailed information relating to these phenotypic measures and the DNA extraction and genotyping procedures can be found in Bidinost et al (2008).…”

mentioning

confidence: 99%

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Merino sheep: a further look at quantitative trait loci for wool production

Roldan¹,

Dodero²,

Bidinost

et al. 2010

Animal

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Quantitative Genetics

Chatterjee

2022

Genetics Fundamentals Notes

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Estimating effective population size of guanacos in Patagonia: an integrative approach for wildlife conservation

2015

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By the mid-1900s the guanaco (Lama guanicoe) approached extinction in southern South America due to habitat destruction and hunting. In order to maintain the ecological prominence of this iconic species, as well as assist in the management of populations that are emerging economically while increasing in conservation value, accurate and potentially rapid estimates of effective population size (N e ) (demographic and/or genetic) are essential. Estimates of N e generally focus on the genetic effective population size; however, we posited that both parameters may be necessary to provide more accurate and timely estimates. Therefore, we examined the performance of three demographic and four genetic estimators of N e of guanacos in Torres del Paine National Park, Chile, at different years and time intervals between 1987 and 1997. We compared our estimates with census estimates of the adult population size (N ac ) during the same time period. Average N e /N ac ratios of demographic estimates varied between 0.04 and 0.99 of the adult census size. Genetic estimates varied between 0.02 and 0.08 of the adult census size. Based upon group composition and population size (n = 82) of guanacos in 1975, the number of breeding adults was 44 animals. Mean N e of the single-sample and temporal genetic estimators was 43.1, and 34.3, respectively; estimated N e of one of the demographic estimators was 41. Our findings suggest that intermittent genetic estimates of N e (via fecal samples, carcasses, blood collection during capture, and/or other non-invasive methods) can provide crucial information regarding the genetic integrity of increasingly isolated populations of wild South American camelids. Considering the overall performance of these estimators, and differences in how each functions, we recommend an integrative approach using both genetic and demographic estimators, to evaluate N e for the wild South American camelids and other species with polygynous mating systems.

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Wool quantitative trait loci in Merino sheep

Cited by 26 publications

References 15 publications

Merino sheep: a further look at quantitative trait loci for wool production

Merino sheep: a further look at quantitative trait loci for wool production

Quantitative Genetics

Estimating effective population size of guanacos in Patagonia: an integrative approach for wildlife conservation

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