Population structure of the Brazilian Crioula Lageana cattle (Bos taurus) breed

Abstract

Background: The lack of information on population structure is one of the main obstacles to develop breeding and conservation programs for animal genetic resources. Objective: To characterize the population structure of Crioula Lageana cattle breed (Bos taurus) in order to assess its genetic diversity. Methods: Database with information of 1,638 Crioula Lageana animals, collected during 38 years, was analysed using the ENDOG v.4.4 program. Results: Effective population size ranged from 72.53 in complete generations to 143.90 in maximum generations. Inbreeding and Average Relatedness coefficients were 0.34 and 0.91%, respectively. The effective number of founders and ancestors were 29 and 28 animals, respectively, and only ten ancestors were responsible for 50% of the genetic variability of the whole population. The average generation interval was 5.84 years in the paternal line and 7.70 in the maternal one. Wright´s F statistics indicated low Palavras-chave: análise de pedigree, conservação de recursos genéticos animais, diversidade genética, endogamia, raças localmente adaptadas.

Evaluation of the Romosinuano cattle population structure in Mexico using pedigree analysis

“…The numbers of ancestors that explained 50% of the genetic variability of Romosinuano in the present study (9 to 12) were similar to Lageana Crioula breed (10; Pezzini et al, 2018), Romosinuano (8) and CCC (12), but smaller than SM (22) and BON (22) Colombian breeds (Martínez et al, 2008), Marchigiana (13) and Bonsmara (41) (Santana et al, 2012), and Gir (38;Santana et al, 2014).…”

“…Regarding the integrity of the pedigree, the EG of the present study increased during the recent 20 yr and reached in RP3, 3.43 for UP and 3.34 for SP (Table 2). Those estimates were smaller than those for Romosinuano (4.8), SM (3.8) and CCC (3.7) Colombian creole breeds (Martínez et al, 2008) but higher than the interval 0.81 to 2.97 in eight Spanish autochthonous breeds (Gutiérrez et al, 2003), the EG in BON (3.1; Martínez et al, 2008), and the estimate in Lageana Crioula cattle breed (0.77, Pezzini et al, 2018). The PCI is an important measure of the quality of inbreeding estimates from the pedigree since PCI represents a harmonic mean of parental genetic contributions and equals zero if any parent is unknown regardless of how deep and complete is the pedigree for the other parent.…”

“…The average GI observed in the present study for the different reference populations (6.41 to 6.54 yr for UP and 6.47 to 7.16 yr for SP; Table 1) were larger than those of Colombian creole breeds such as Costeño con Cuernos (CCC, 5.4 yr), Blanco Orejinegro (BON, 4.7 yr) and Romosinuano (ROM, 5.7 yr), but similar to Sanmartinero (SM, 6.8 yr) (Martínez et al, 2008), and to Brazilian Lageana Crioula cattle breed (6.41 yr; Pezzini et al, 2018). Gutiérrez et al (2003) estimated an interval of GI in eight autochthonous Spanish cattle breeds (Alistana, Asturiana de la Montaña, Asturiana de los Valles, Avileña-Negra Ibérica, Bruna dels Pirineus, Morucha, Pirenaica and Sayaguesa) of 3.7 to 6.1 yr.…”

Genome-wide detection of signatures of selection in indicine and Brazilian locally adapted taurine cattle breeds using whole-genome re-sequencing data

“…Decreased levels of inbreeding and high genetic variability have been previously described for both breeds, probably resulting from a slight selection pressure and herd management focused on maintaining genetic diversity by using a male:female relationship larger than usual [19]. Egito et al [15] attributed such results to the formation of new PAN herds from 2009 onwards while Pezzini et al [18] associated it with the diversification in the use of CRL sires. Further, Egito et al [19] stated that CRL and PAN cattle were the most diverse population with the highest mean allelic richness among four locally adapted cattle breeds investigated.…”

“…However, despite the recent achievements in high-throughput sequencing, studies to detect positive selection in endangered Brazilian locally adapted cattle breeds are incipient. Previous studies on such breeds have mainly focused on population structure and genetic diversity using Random Amplified Polymorphic DNA (RAPD), pedigree data, microsatellite, and Single-Nucleotide Polymorphism (SNP) arrays [15][16][17][18][19].…”