Desempenho das caracter?sticas produtivas e reprodutivas de diferentes grupamentos gen?ticos (Holand?s X Gir) na Baixada Fluminense, Rio de Janeiro - RJ

• Main Author: Pereira, Viviane Andrade da Costa
• Publication Date: 2008
• Format: Master thesis
• Language: por
• Source: Biblioteca Digital de Teses e Dissertações da UFRRJ
• Download full: https://tede.ufrrj.br/jspui/handle/tede/587
• topic: gado leiteiro; clima tropical; produ??o de leite; dairy cattle; tropical climate; milk production; Zootecnia

This study evaluated 4,407 lactations of 1,167 crossbred animals Holstein x Gir obtained on the farm "Morro da Tenda" located in Serop?dica in Baixada Fluminense in Rio de Janeiro during the period from 1970 to 2007. We evaluated the production of milk (PL), lactation length (DL), calving interval (IDP) and milk production per day of calving interval (PLIDP). The data were subjected to restrictions recital productions between 710 and 10,065 kg, IDP between 265 to 548 days, ages at calving to 20 to 160 months and the orders at calving until the 11th. After the restrictions, the data were analyzed using the methodology GLM (Generalized Linear Model) through the SAS program. Later, in statistical analysis, adopted is a model that included the effects of years of calving, season of calving, genetic group, interaction season of calving x genetic group, as well as the covariate age of the animal at calving. For all variables studied, significant results were observed for the effects of years of calving, interaction season of calving x genetic group and the covariate age of the cow at calving. The averages were: 4,683.99 ? 1,596.42 kg, 306.07 ? 71.05 days, 391.82 ? 52.83 days and 11.75 ? 4.26 kg / day for PL, DL, and IDP PLIDP, respectively