Genealogical information analysis of Gyr and Nelore cattle from Costa Rica /Analise de informacoes genealogicas de bovinos Gir e Nelore da Costa Rica

The objectives were to analyze the genealogical information of Gyr (GY) and Nelore (NL) cattle from Costa Rica. Analyzed: pedigree integrity (GY, 13272; NL, 18153); number of complete, maximum traced and equivalent complete generations; inbreeding (FI); generation interval (GI) through four selection routes; average additive genetic ratio (AGR); effective number of founders (fe); effective number of ancestors (fa); effective population size (Ne). The analysis was performed with the ENDOG software. The maximum proportion of unknown parents, grandparents, and great-grandparents was 18.6%, 39.9%, and 59.3%, respectively. The average FI for NL was 8.87% and 2.85% in GY. The average consanguineous population (%) and FI was 53.9 and 16.5% in NL, 28.9 and 9.9% in GY. The average and maximum values of AGR for NL were 3.5 and 12.8, 1.4 and 5.6 in GY. The fe and fa for NL were 65.0 and 38.0, in GY 145.7 and 59.0. The Ne indicated increases in FI in the range of 1 to 2% in GY, for NL greater than 2%, with a status of care to monitor the evolution of F and AGR and their possible implications in genetic improvement. The GI ranged from 6.3 to 7.9 years with a general average of 6.9 years. These results show a summary of the genetic and reproductive management those breeders have carried out. Key words: inbreeding, generation interval, effective size, ancestors, zebu cattle. Os objetivos foram analisar as informacoes genealogicas de bovinos Gir (GY) e Nelore (NL) da Costa Rica. Foram considerados: integridade do pedigree (GY, 13272; NL, 18153); numero de geracoes completas, maximas tracadas e equivalentes completas; endogamia (FI); intervalo de geracao (GI) por meio de quatro rotas de selecao; razao genetica aditiva media (AGR); numero efetivo de fundadores (fe); numero efetivo de ancestrais (fa); tamanho efetivo da populacao (Ne). A analise foi realizada com o software ENDOG. A proporcao maxima de pais, avos e bisavos desconhecidos foi de 18,6%, 39,9% e 59,3%, respectivamente. O FI medio para NL foi de 8,87% e 2,85% no GY. A media da populacao consanguinea (%) e FI foi de 53,9 e 16,5% em NL, 28,9 e 9,9% em GY. Os valores medios e maximos de AGR para NL foram 3,5 e 12,8, 1,4 e 5,6 no GY. Os fe e fa para NL foram 65,0 e 38,0, no GY 145,7 e 59,0. O Ne indicou aumentos de FI na faixa de 1 a 2% no GY, para NL superiores a 2%, com status de cuidado para acompanhar a evolucao de F e AGR e suas possiveis implicacoes no melhoramento genetico. O IG variou de 6,3 a 7,9 anos com me