Phenotypic evaluation of trait types in Guzerá cows of different calving orders

Dorgival Morais de Lima Júnior, Adriano Henrique do Nascimento Rangel, Guilherme Ferreira da Costa Lima, Lúcio Flávio Macedo Mota, Gelson dos Santos Difante, Stela Antas Urbano, Waldonys Moreira Pinheiro

Abstract


The objective of this study was to evaluate the effect of parity on linear trait types in Guzerá cows using multivariate techniques. Data were collected from 68 purebred Guzera females, young (1st and 2nd calving order) and adults (3rd to 7th calving order). Measurements were collected using a tape measure, a hypometer, a 40 cm graduated ruler and a 180° protractor. PRCOMP procedure of the R program was used for analyzing the main components. The variables related to rump (height, angularity, ileum and ischium length and width), body (length), udder (height of posterior ligament) and milk production were more important to explain the phenotypic variation in Guzerá cattle. Young Guzerá cows had lower body length, narrower rumps, better udder ligaments and lower milk yield than adult cows.

Keywords


Dairy cattle; Multivariate; Zebu cattle.

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DOI: http://dx.doi.org/10.5433/1679-0359.2017v38n4Supl1p2755

Semina: Ciênc. Agrár.
Londrina - PR
E-ISSN 1679-0359
DOI: 10.5433/1679-0359
E-mail: semina.agrarias@uel.br
Este obra está licenciado com uma Licença Creative Commons Atribuição-NãoComercial 4.0 Internacional