Examinando por Materia "Effective population size"

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Genetic structure of the population of Suri alpaca from Peru
(ResearchersLinks Ltd, 2023-11-01) Gallegos Acero, Roberto; Canaza Cayo, Ali William; Rodríguez Huanca, Francisco Halley; Mamani Cato, Rubén Herberht
The objective of the study was to evaluate the genetic structure of the Suri alpaca population, from the Quimsachata Research and Production Center of the Illpa-Puno Experimental Station of the National Institute of Agrarian Innovation, Peru. Data from 1350 Suri alpacas born from 1993 to 2015 (636 males and 714 females) were analyzed using the method of genealogical analysis method. ENDOG program v.4.8 was used for the calculation of the following parameters of the genetic structure such as: average inbreeding coefficient (F), average relatedness coefficient (AR), the effective numbers of founders (ƒe), effective number of ancestors (ƒa), generation interval (GI) and the pedigree completeness, the ENDOG program v.4.8 was used. The F and AR were 0.06% and 0.40%, respectively, the number of ancestors that gave rise to the reference population was 288, the ƒa for the reference population was 132. The ƒe was 338 animals. The average generational interval was 5.53 years, being higher in the gametic pathways: sire-daughter and sire-son. The pedigree completeness level by the maternal pathway was 72.07% and by the paternal pathway was 46.0%. In conclusion, the generational interval in Suri alpacas of the Germplasm Center was long. The F was of small magnitude, so mating practices were appropriate during the evaluation period.
Genomic characterization of Peruvian Creole goats: insights into population structure and runs of homozygosity
(Animals, 2025-09-02) Corredor Arizapana, Flor Anita; Godoy Padilla, David José; Sessarego Dávila, Emmanuel Alexander; Temoche Socola, Victor Alexander; Paredes Chocce, Miguel Enrique; Escobar Robledo, Héctor Manuel; Ramírez Antaurco, Máximo Fabricio; Burgos Paz, William; Ruiz Chamorro, José Antonio; Cruz Luis, Juancarlos Alejandro; Mulim, Enrique A.; Rojas de Oliveira, Hinayah
Peruvian Creole goats (PCGs) represent a unique genetic resource shaped by adaptation to diverse environments and traditional breeding practices. In this study, we performed a genomic analysis of six regional populations (Ancash, Ica, Lambayeque, Lima, Piura, and Tumbes) using high-density SNP genotype data. Principal component analysis revealed a moderate genetic structure, with the Ica population showing clear separation and northern populations exhibiting overlap. Runs of homozygosity were predominantly short, and specific regions on chromosome 6 were shared across populations. Inbreeding coefficients were generally low, with Ancash showing the highest values. Linkage disequilibrium decayed rapidly over genetic distance, especially in Piura, indicating higher genetic diversity. Estimates of effective population size revealed decreasing trends across populations, with Piura maintaining the largest recent population size. These findings offer valuable insights into the population structure of Peruvian Creole goats, providing guidance for conservation and sustainable breeding efforts.