Phenotypic evaluation of trait types in Guzerá cows of different calving orders
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Data
2017-01-01
Autores
De Lima Júnior, Dorgival Morais
Rangel, Adriano Henrique Do Nascimento
Da Costa Lima, Guilherme Ferreira
Mota, Lúcio Flávio Macedo [UNESP]
Difante, Gelson Dos Santos
Urbano, Stela Antas
Pinheiro, Waldonys Moreira
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Resumo
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.
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Dairy cattle, Multivariate, Zebu cattle
Como citar
Semina:Ciencias Agrarias, v. 38, n. 4, p. 2755-2764, 2017.