Identificação e caracterização fenotípica dos grupos genéticos da raça Girolando nos rebanhos leiteiros do estado de Roraima
Carregando...
Data
2017
Autores
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Brasil
Resumo
The dairy cattle in the State of Roraima is supported by crossbred Holstein x Gir cattle,
more adapted to the tropical climate and traditional production systems. However,
there is a need to adapt the genetic groups to the production systems and to raise
awareness about the importance of the use of phenotypic visual evaluations as a tool
to assist in the selection of animals. The objectives of the research were to identify the
frequency and characterize the phenotype of the genetic groups ¼ Hol + ¾ Gir, ⅜ Hol
+ ⅝ Gir, ½ Hol + ½ Gir, ⅝ Hol + ⅜ Gir, ¾ Hol + ¼ Gir and ⅞ Hol + ⅛ Gir of the
Girolando breed in the herds of the State of Roraima. The data were obtained from
visual morphological evaluations to identify the genetic groups and to characterize the
phenotype of the animals from August 2016 to February 2017. The following
distribution of the frequency of genetic groups: 210 (21.26%) of the group ¼ Hol + ¾
Gir; 145 (14.68%) of the group ⅜ Hol + ⅝ Gir; 249 (25.20%) of the ½ Hol + ½ Gir; 166
(16.80%) of the group ⅝ Hol ⅜ + Gir; 126 (12.75%) of the ¾ Hol + ¼ Gir and 92 (9.3%)
of the group ⅞ Hol + ⅛ Gir. In the phenotypic evaluations there were statistically
significant differences (p <0.05) in the genetic group ¾ Hol + ¼ Gir for General
Appearance (GA), in the genetic groups ⅝ Hol + ⅜ Gir and ⅞ Hol + ⅛ Gir for Body
Capacity (CC), in the ½ Hol + ½ Gir group for Dairy Characteristics (CL) and in the
groups ¾ Hol + ¼ Gir and ⅞ Hol + ⅛ Gir for Reproductive and Apparatus e aprumos
(AR/A). The genetic group ½ Hol + ½ Gir presented superior characteristics in the Body
Capacity (CC), the Milk Characteristics (CL) and the Reproductive and Apparatus e
aprumos (AR/A), being better classified as to the type of Girolando breed
demonstrating better characterization and uniformity by selective process.
Descrição
Palavras-chave
Fenótipo, Heterose, Melhoramento animal, phenotype, heterosis, animal breeding