Genetic diversity and population structure estimation of Brazilian Somali sheep from pedigree data

Figueredo, Jennifer Souza; Cruz, Jurandir Ferreira da; Sousa, Leonor; Neto, Milton Rezende Teixeira; Carneiro, Paulo L. S.; Brito-Núñez, Nafxiel Jesús; Pinheiro, Raquel; Lacerda, K.S.O.; Mottin, Viviane

doi:10.1016/j.smallrumres.2019.09.010

Cited by 10 publications

(7 citation statements)

References 25 publications

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“…Similar to the result of this study, McManus et al (2019) obtained the value of one for f e f a ratio in Brazilian Morada Nova hair sheep. Similar to the low estimate of F IT statistics in the pedigree of Shall sheep, Barros et al (2017), Figueredo et al (2019) and McManus et al (2019) reported low values for this statistics in Segureña sheep (0.006), Brazilian Somali sheep (0.069) and Brazilian Morada Nova hair sheep (0.060), respectively. The low value of F IT suggests the presence of gene flow among the flocks which may result from the sharing of rams or the application of artificial insemination.…”

Section: Discussionsupporting

confidence: 58%

“…(3.79 years), Dorper (4.0 years) and Lori-Bakhtiari (4.11 years) sheep breeds, respectively; but was greater than the reports of Pedrosa et al (2010), Eteqadi et al (2014), Yavarifard et al (2014), Rochus and Johansson (2017), Figueredo et al (2019) and McManus et al (2019) in Santa Inês (3.70 years), Guilan (2.85 years), Mehraban (2.15 years), Gute (3.60 years), Brazilian Somali (3.53 years) and Brazilian Morada Nova (3.60 years) sheep breeds, respectively. The possible reasons for different estimates of generation interval for various sheep breeds were because of the differences in breeding plans and culling/ replacement strategies in the corresponding populations (Vatankhah et al 2019).…”

Section: Discussionmentioning

confidence: 63%

“…The f e f a ratio obtained in this study (1.001) would be considered as ideal value for this parameter, proposes that nearly all of ancestors in the current sheep population were the founders, indicating no genetic bottleneck. Greater f e f a ratios were reported by Pedrosa et al (2010), Barros et al (2017), Figueredo et al (2019), Kiya et al (2019), Vatankhah et al (2019) in Santa Inês (1.35), Segureña (1.12), Brazilian Somali (1.18), Dorper (1.09) and Lori-Bakhtiari (1.11) sheep breeds, respectively. Similar to the result of this study, McManus et al (2019) obtained the value of one for f e f a ratio in Brazilian Morada Nova hair sheep.…”

Section: Discussionmentioning

confidence: 83%

“…The Shall sheep, as a large-sized fat-tailed breed, is reared principally for meat production, but the sale of excess lambs is the principal source of income for breeders , 2015. There are different reports in the literature on the population genetic structure of sheep breeds (Pedrosa et al 2010;Ghavi Hossein-Zadeh 2012a;Eteqadi et al 2014;Yavarifard et al 2014;Barros et al 2017;Figueredo et al 2019;Kiya et al 2019;Vatankhah et al 2019), but there were no published reports of population structure analysis in Shall sheep. Therefore, the main objective of this study was to describe the population structure, genetic variability and inbreeding in Shall sheep of Iran using pedigree analysis.…”

Section: Introductionmentioning

confidence: 99%

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Population genetic structure analysis of Shall sheep using pedigree information and effect of inbreeding on growth traits

Hashemi

Hossein-Zadeh

2020

Italian Journal of Animal Science

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The objective of this study was to use pedigree analysis to describe the population structure, genetic variability and inbreeding to quantify their effects on growth traits in Shall sheep. The analysis was based on the pedigree information of 64,964 animals. Data and pedigree information used in this study were collected from 1982 to 2012 by the Animal Breeding Centre of Iran. Growth traits included were birth weight (n ¼ 12,786), 3-month weight (n ¼ 9521), 6-month weight (n ¼ 5106), average daily gain from birth to three-(n ¼ 8543) and 6-month of age (n ¼ 4,303) and their corresponding Kleiber ratios (n ¼ 8543; n ¼ 4,303, respectively). The CFC program was applied to calculate pedigree statistics and the population genetic structure of the Shall sheep. Also, the INBUPGF90 program was used for calculating inbreeding coefficients for individuals. The pedigree analysis indicated that the inbreeding coefficient ranged from 0 to 38% with an average of 1.62%. The average coancestry was 0.0072% and the generation interval was 3.755 years. Inbreeding depression was observed for all growth traits in this population of sheep. Based on the estimate of effective population size (910.25), it is expected to have enough genetic variability in the understudy population. On the other hand, the ratio of the effective number of founders to the effective number of ancestors (1.001) indicated no genetic bottleneck in Shall sheep. Breeders must do their best to prevent the mating between closely related animals and use this as an appropriate strategy to maintain the inbreeding under control in this sheep breed. HIGHLIGHTS The average coefficients of inbreeding and coancestry were low in Shall sheep. Enough genetic variability was available in Shall sheep and no genetic bottleneck occurred in this population. Inbreeding depression was observed for growth traits in this population of sheep.

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Section: Discussionsupporting

confidence: 58%

Section: Discussionmentioning

confidence: 63%

Section: Discussionmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

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Population genetic structure analysis of Shall sheep using pedigree information and effect of inbreeding on growth traits

Hashemi

Hossein-Zadeh

2020

Italian Journal of Animal Science

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“…The development of high-density genotyping platforms brings new possibilities to estimate genetic diversity parameters or population structure (Grilz-Seger et al 2019;Moravcikova et al 2019;Nandolo et al 2019). Despite the advantages of these methods, the genealogical records remain commonly used to determine the factors which affected total genetic diversity loss (Figueredo et al 2019;Goleman et al 2019;Hofmannova et al 2019). In poultry, there were only a few studies based on pedigree data published (Marquez et al 2010;Graczyk et al 2015;Pham et al 2016;Gholizadeh 2017).…”

mentioning

confidence: 99%

Monitoring of genetic diversity in autochthonous Czech poultry breeds assessed by genealogical data

Vostrý¹,

Vostrá-Vydrová²,

Moravčíková³

et al. 2020

CZECH J ANIM SCI

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Czech local poultry breeds face high risks of extinction. Because these populations are closed, they are more likely to lose genetic diversity. The aim of this analysis was to determine the loss of genetic diversity in three Czech autochthonous poultry breeds. Pedigree data from a total of 1 932 Czech Gold Speckled Hens, 325 Czech White Geese and 111 Czech Crested Geese registered in studbooks between 2000 and 2018 were evaluated. Data were analysed to determine the major factors that affect the genetic variability of these breeds. The average numbers of equivalent complete generations ranged from 2.53 to 4.82. The effective numbers of founders were from 29 to 59, representing from 43% to 62% of the total number of founders. The effective number of ancestors was estimated in the range of 21 to 41. The average inbreeding coefficient and relatedness coefficient (in parentheses) for the reference populations were 2.0% (6.5%), 1.9% (4.9%) and 2.1% (9.3%), respectively. The results showed that the effective population size derived from the rate of inbreeding ranged from 46 to 108 and if derived from the rate of coancestry it ranged from 35 to 74. With regard to these results, the analysed breeds showed a high probability of allele loss and consequent loss of genetic diversity.

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Massese sheep characteristics and demo-genetic trends in the province of Pisa (Italy)

Giuliotti,

Benvenuti,

Ventura

et al. 2023

Rend. Fis. Acc. Lincei

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Preserving animal breeds is key to a country’s economy, environment and culture. The present study collects all the available information on the Massese sheep breed and analyzes their demo-genetic trends in Pisa since 1976. Data were provided by Asso.Na.Pa. Descriptive statistics were analysed using Jmp software. The pedigree parameters of a total of 10,393 animals (whole population-WP) were analyzed using CFC, ENDOG and Pedigree viewer software. Animals born in the last fifteen years represented the Reference Population (RP), while animals with one or two unknown parents constituted the Base Population (BP). Demographic results showed an inconstant trend of offspring registration in the Herd book with two periods of a dramatic decline in lamb registrations and a substantially short productivity with a mean number of registered newborns of 1.5 and 18.2 for ewes and rams, respectively. A total of 6456 animals represented the RP, of which only 1059 animals (16.4%) had both known parents. The BP consisted of 7156 animals, thus highlighting the lack of sire and dam registration which prevented an accurate evaluation of the genetic parameters. The average inbreeding coefficient in the WP was 0.78%, and 0.046% in the RP. The number of inbreds was 575 in the WP and 17 in the RP. The present study represents a tool for breeders and technicians aimed at conserving and exploiting the genetic resources of Massese sheep through efficient breeding plans.

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Genetic diversity and population structure estimation of Brazilian Somali sheep from pedigree data

Cited by 10 publications

References 25 publications

Population genetic structure analysis of Shall sheep using pedigree information and effect of inbreeding on growth traits

Population genetic structure analysis of Shall sheep using pedigree information and effect of inbreeding on growth traits

Monitoring of genetic diversity in autochthonous Czech poultry breeds assessed by genealogical data

Massese sheep characteristics and demo-genetic trends in the province of Pisa (Italy)

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Genetic diversity and population structure estimation of Brazilian Somali sheep from pedigree data

Cited by 10 publications

References 25 publications

Population genetic structure analysis of Shall sheep using pedigree information and effect of inbreeding on growth traits

Population genetic structure analysis of Shall sheep using pedigree information and effect of inbreeding on growth traits

Monitoring of genetic diversity in autochthonous Czech poultry breeds assessed by genealogical data

Massese sheep characteristics and demo-genetic trends in the province of Pisa (Italy)

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Product

Resources

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Monitoring of genetic diversity in autochthonous Czech poultry breeds assessed by genealogical data