15.0 Normal 0 21 false false false ES-CO X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:Tabla normal; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin-top:0cm; mso-para-margin-right:0cm; mso-para-margin-bottom:8.0pt; mso-para-margin-left:0cm; line-height:107%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:Calibri; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-ansi-language:ES-CO; mso-fareast-language:EN-US;} Summary Background: Lori sheep is an Iranian heavy breed known for its superiority in terms of disease resistance, adaptability to the mountainous west of the country and meat production potential. Objective: to estimate and compare the inbreeding coefficient in Lori sheep, and its impact on growth traits. Methods: data and pedigree information were collected in Lorestan Agricultural and Natural Resources Research Center, west of Iran, during 2001-2010. Traits included were birth weight (BW), weaning weight (WW), 6-month weight (6MW) and 9-month weight (9MW). The inbreeding coefficient estimation was carried out through the CFC software, and quantification of individual inbreeding regression on the characteristics was conducted using The Wombat software. All animals were divided into four categories according to the inbreeding coefficients obtained from their pedigree: the first category included non-inbred animals (F = 0%); and the second, third, and fourth categories included inbred animals as 0 0.20, respectively. Results: inbreeding coefficients were 0.69% and 2.24% in the entire population and inbred population, respectively. Inbreeding regression for BW, WW, 6 MW and 9 MW were estimated as +4.5, -10.3, -76.3, and -77.4 g, respectively. The inbreeding trend was positive and significant for the whole population (0.215; p 0,20, respectivamente. Resultados: los coeficientes de endogamia fueron de 0,69 y 2,24% en toda la poblacion y en la poblacion endogamica, respectivamente. La regresion de endogamia para BW, WW, 6 MW, y 9 MW se estimo como +4,5, -10,3, -76,3 y -77,4 g, respectivamente. La tendencia endogamica fue positiva y significativa para toda la poblacion (0,215; p 0,20, respectivamente. Resultados: os coeficientes de endogamia foram de 0,69% e 2,24%, em toda a populacao e populacao consanguinea, respectivamente. A regressao da endogamia para BW, WW, 6 MW e 9 MW foi estimada em +4,5, -10,3, -76,3 e -77,4 g, respectivamente. A tendencia da endogamia foi positiva e significativa em toda a populacao (0,215; p < 0,001), mas nao significativa na populacao consanguinea. Conclusao: os resultados confirmaram o baixo nivel de endogamia e sugerem que a aplicacao de um sistema de monta controlada direta poderia ser um metodo apropriado para evitar a depressao por endogamia. Palavras chave: categorias de endogamia, efeitos de endogamia, estatisticas do pedigree, sistema de acasalamento.