Reproductive and Production Components for the Beef Herd of Embrapa Cerrados

Revista Brasileira de Zootecnia

McManus, Concepta²  Serrano, Germana¹  Paludo, Giane Regina²  Saueressig, Moacir Gabriel³  Falcão, Rui Arruda¹  Marcelino, Kenia Régia Anasenko¹ 

[1] Universidade de Brasília;EMBRAPA Cerrados, Planaltina

关键词: calving interval;    true fertility;    reproductive parameters;    principal components;    correlations     IntroduçãoO crescimento sistemático da população brasileira acarreta uma demanda crescente de proteína animal;   

DOI  :  10.1590/S1516-35982002000300015

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

- The objective of this work was to analyze the various factors which influence calving interval (CI), true fertility (TF), ratio of birth (RBW) and weaning weight (RWW) of the calf to the calving weight of the cow, using the crossbred herd of EMBRAPA Cerrados as a model. The data, from 4469 calvings, collected between 1976 and 1999, was analyzed using the GLM, CORR and PRINCOMP procedures of SAS. The reproductive parameters investigated include ratio of calf birth weight/calving weight of cow (RBW), calf weaning weight / calving weight of cow (RWW) and TF as well as body condition scores (BC) and weights. The correlations between the traits were, generally, low, and sometimes negative with RBW and RWW while with TF they were higher. BC at calving did not affect mortality nor calf birth weight but did affect the following calving interval. The FR increased with increased calving BC as did calving interval. A lower calving interval and higher true fertility was observed with higher weaning BC score. The genetic group of the bull did not influence any of the traits analyzed, which group of the cow influenced birth weight. The environment (month, year and number of parturition) and genetics (sex) significantly influenced birth and weaning weights. The first two principal components explain 56% of the total variation between the traits examined.

【 授权许可】

CC BY-NC