作者: Alexandre Balancin Júnior , Marco Aurélio Prata , Heverton Luis Moreira , Aníbal Eugênio Vercesi Filho , Vera Lúcia Cardoso
关键词: Milk production 、 Milk yield 、 Ice calving 、 Lactation 、 Calving interval 、 Crossbreed 、 Biology 、 Gestation length 、 Persistence (computer science) 、 Animal science
摘要: This study aimed to evaluate the productive and reproductive performance of Holtein-Frisian x Gir crossbred cows. The traits evaluated were: milk production up 305 days (P305), total (PTL), per day calving interval (PIP), age at first (IPP), (IDP), service period (PS) gestation length (PG), which were analyzed using mixed linear models. Incomplete gamma function was used estimate parameters lactation curves for each genetic group. animals groups (GG) 3/4H, 7/8H pure by crosses (PC) achieved higher performances traits, from GG 1/2H better traits. Holstein-Frisian PC presented with levels productions peak but less persistence. had slightly lower persistence in comparison 3/4H 7/8H. Milk varied according group greater decrease yield after conception.