Equivalent effective population size mating as a useful tool in the genetic management of the Ibicenco rabbit breed (Conill Pages d'Eivissa)

Rosa, A.J.M; Cervantes, I.; Gutiérrez, Juan Pablo

doi:10.17221/8783-cjas

Cited by 12 publications

(13 citation statements)

References 23 publications

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“…Nagy et al (2010) studied the generation interval on Pannon White rabbits in Hungary and reported the overall mean as 1.211 yr for the whole population. Similar study was carried out on Sika rabbits in Slovenia by Planinc et al (2012) and Ibicenco rabbits in Spain by Martín de la Rosa et al, (2016) who reported the mean generation intervals as 1.16 and 1.0 yr, respectively.…”

Section: Generation Intervalsupporting

confidence: 77%

“…The knowledge on pedigree completeness is important, as the inferences drawn on inbreeding and effective population size depend on it. The pedigree depth is important because it plays a significant part in the rest of the parameters that require genealogical data for their calculation (Martín de la Rosa et al, 2016). Up to 5 th generation, 71.29% pedigree was complete (Figure 1).…”

Section: Pedigree Completenessmentioning

confidence: 99%

“…The analyses regarding probability of gene origin are of great concern when analysing small populations, as all the genetic stock, except for migration and mutation, comes from the founder animals. Management of this initial stock is crucial for the future of the population (Martín de la Rosa et al, 2016). The number of founders and ancestors for the whole population were 40 and 29, respectively, whereas the f e and f a for the reference population were 11 and 10, respectively.…”

Section: Probability Of Gene Originmentioning

confidence: 99%

“…Inbreeding reduces the mean of fitness traits such as survival and reproduction, and consequently worsens general vigour and fertility i.e., inbreeding depression (Planinc et al, 2012). Preservation of maximum genetic diversity is one of the main objectives in small populations (Martín de la Rosa et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Genetic structure of a small closed population of the New Zealand white rabbit through pedigree analyses

et al. 2018

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The genetic structure of a small population of New Zealand White rabbits maintained at the Sheep Breeding and Research Station, Sandynallah, The Nilgiris, India, was evaluated through pedigree analyses. Data on pedigree information (n=2503) for 18 yr (1995-2012) were used for the study. Pedigree analysis and the estimates of population genetic parameters based on the gene origin probabilities were performed. The analysis revealed that the mean values of generation interval, coefficients of inbreeding and equivalent inbreeding were 1.49 yr, 13.23 and 17.59%, respectively. The proportion of population inbred was 100%. The estimated mean values of average relatedness and individual increase in inbreeding were 22.73 and 3.00%, respectively. The percentage increase in inbreeding over generations was 1.94, 3.06 and 3.98 estimated through maximum generations, equivalent generations and complete generations, respectively. The number of ancestors contributing the majority of 50% genes (fa50) to the gene pool of reference population was only 4, which might have led to reduction in genetic variability and increased the amount of inbreeding. The extent of genetic bottleneck assessed by calculating the effective number of founders (fe) and the effective number of ancestors (fa), as expressed by the fe/fa ratio was 1.1, which is indicative of the absence of stringent bottlenecks. Up to 5th generation, 71.29% pedigree was complete, reflecting the well maintained pedigree records. The maximum known generations were 15, with an average of 7.9, and the average equivalent generations traced were 5.6, indicating a fairly good depth in pedigree. The realized effective population size was 14.93, which is very critical, and with the increasing trend of inbreeding the situation has been assessed as likely to become worse in future. The proportion of animals with the genetic conservation index (GCI) greater than 9 was 39.10%, which can be used as a scale to use such animals with higher GCI to maintain balanced contribution from the founders. From the study, it was evident that the herd was completely inbred, with a very high inbreeding coefficient, and the effective population size was critical. Recommendations were made to reduce the probability of deleterious effects of inbreeding and to improve genetic variability in the herd. The present study can help in carrying out similar studies to meet the demand for animal protein in developing countries.

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Section: Generation Intervalsupporting

confidence: 77%

Section: Pedigree Completenessmentioning

confidence: 99%

Section: Probability Of Gene Originmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Genetic structure of a small closed population of the New Zealand white rabbit through pedigree analyses

et al. 2018

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“…The effective population size (Ne) was estimated based on two approaches (NeI and Nec) implemented in Endog version 4.8 60 . First, Ne was calculated to estimate the founder population size and to detect the existence of bottlenecks and possible consequences of the mating strategy, via the individual increase in inbreeding (NeI), as proposed by De la Rosa et al 67 . To calculate NeI, the coefficient of individual increases in inbreeding (∆Fi), determined according to Falconer and Mackay 68 and modified by Gonzales-Recio et al 69 and Gutiérrez et al 70 , was used.…”

Section: Studbook Data and Pedigree Analysesmentioning

confidence: 99%

Studbook and molecular analyses for the endangered black-lion-tamarin; an integrative approach for assessing genetic diversity and driving management in captivity

Ayala-Burbano

Galetti

Wormell

et al. 2020

Sci Rep

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& patrícia Domingues de freitas 1 ✉Breeding strategies based on molecular markers have been adopted by ex-situ conservation programs to assess alternative parameters for the genetic diversity estimates. in this work we evaluated molecular and studbook data for captive populations of black-lion-tamarin (BLt), an endangered primate endemic to Brazil's Atlantic forest. pedigree analyses were performed using BLT studbook information collected from 1973 to 2018. We analyzed the whole captive population since its foundation; the current captive population (ccp); and all extant BLts in the Brazilian captive population (Bcp), separately. Microsatellite analyses were implemented on the Bcp individuals from the eighth generation (BCP-F8) only to avoid generation overlap. The expected heterozygosity for BCP-F8, using molecular, data was 0.45, and the initial expected heterozygosity was 0.69. Kinship parameters showed high genetic relationships in both pedigree and molecular analyses. the genealogybased endogamy evidenced a high inbreeding coefficient, while the molecular analyses suggested a non-inbreeding signature. the Mate Suitability index showed detrimental values for the majority of potential pairs in the ccp. nevertheless, some individuals evidenced high individual heterozygosity and allele representation, demonstrating good potential to be used as breeders. thus, we propose the use of molecular data as a complementary parameter to evaluate mating-pairs and to aid management decision-making.Captive breeding programs have been recognized as a powerful alternative for rescuing endangered species and for biological conservation 1,2 . Often based on pedigree analyses, ex-situ management plans aim to maintain demographically stable populations, retaining genetic diversity, limiting inbreeding, and avoiding adaptation to captivity 1,3-6 . However, this is not an easy task, and consequently captive groups tend to present lower levels of genetic diversity and higher inbreeding rates than expected 2,7 , challenging the success of these captive breeding programs. On the other hand, wild endangered species often present small and fragmented populations subjected to bottleneck effects and absence of gene flow, and low genetic diversity levels are commonly also observed in nature 8,9 . This is the case for the black-lion-tamarin (BLT), Leontopithecus chrysopygus (Callitrichidae, Platyrrhini), an endangered primate inhabiting exclusively the Atlantic Forest of São Paulo state in Southeast Brazil 8,10 .The population size of L. chrysopygus in nature is small 11 , currently estimated at a total of a thousand individuals living in a few small forest fragments 12 . This species was assumed to be extinct about 65 years, when a small population was rediscovered in the Morro do Diabo State Park (SP, Brazil) 13 . At that time, a population census estimated that only about 200 animals existed in nature. In 1973, the first seven wild individuals of two contiguous subgroups of BLT were brought into captivity, at the Biological Bank of Tijuca...

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Genealogical structure of the Colombian Romosinuano Creole cattle

Cañas–Álvarez,

Ossa-Saraz,

Garcés-Blanquiceth

et al. 2023

Trop Anim Health Prod

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The Romosinuano cattle breed is one of the most important Creole genetic resources in Colombia, and interesting traits like adaptation or reproductive efficiency have promoted its use in different countries in America. To consolidate the genealogical historical records, the review of very first yield records in this population was used to reconstruct the genealogy of the breed since the first animals incorporated to the in vivo germplasm bank and estimate different demographic parameters. The complete genealogy comprises 17,136 animals with 5.8 years of generation interval for two pathways. The estimated average inbreeding for the population and inbred animals was 2.53% and 6.32% respectively, with a progressive increase of inbred animals across the generations. Almost 48% of the total animals presented some level of consanguinity. Effective population size (Ne) based on the inbreeding rate estimated by regression in all generations was 120 animals whereas Ne estimated by equivalent generations was 69 animals. Effective number of founders (Fe), effective number of ancestors (Fa), and ancestors explaining 50% of variability were 75, 48, and 22, respectively. The relation between Fa/Fe of 64% indicates a genetic bottleneck effect in the population studied.

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Equivalent effective population size mating as a useful tool in the genetic management of the Ibicenco rabbit breed (Conill Pages d'Eivissa)

Cited by 12 publications

References 23 publications

Genetic structure of a small closed population of the New Zealand white rabbit through pedigree analyses

Genetic structure of a small closed population of the New Zealand white rabbit through pedigree analyses

Studbook and molecular analyses for the endangered black-lion-tamarin; an integrative approach for assessing genetic diversity and driving management in captivity

Genealogical structure of the Colombian Romosinuano Creole cattle

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