2017-11-062017-11-062003-06VASCONCELLOS, Breno de Faria e; PÁDUA, João Teodoro; MUÑOZ, Mário Fernando Cerón; TONHATI, Humberto. Efeitos genéticos e ambientais sobre a produção de leite, o intervalo de partos e a duração da lactação em um rebanho leiteiro com animais mestiços, no Brasil. Revista Universidade Rural. Série Ciências da Vida, Rio de Janeiro, v. 23, n. 1, p. 39-45, jan./jun. 2003.e- 2177-7551http://repositorio.bc.ufg.br/handle/ri/12717A total of 920 records of milk production, 911 records of calving interval an 908 records of lactation length for a dairy herd consisting of 9 different genetic groups (Holstein, Zebu and crossbred) were analyzed by least squares method. The fi xed effects considered in the mathematical model for all three traits were genetic group (GG), season (SP), year (YP) and order of parturition (OP). Lactation length (LL) was also considered in the analysis of milk production. Mean milk yield, calving interval and lactation length were 1473,00 ± 395,91 kg, 459,80 ± 113,38 days and 233,00 ± 74,00 days, respectively. GG and YP affected all the traits. SP affected no one. OP affected milk yield and calving interval, but not lactation length.porAcesso AbertoProdução de leiteDuração da lactaçãoIntervalo entre partosMilk productionLactation lengthCalving intervalCrossbredCowArtigo