Use este identificador para citar ou linkar para este item: https://locus.ufv.br//handle/123456789/21918
Tipo: Artigo
Título: Relationship of testicular biometry with semen variables in breeding soundness evaluation of Nellore bulls
Autor(es): Penitente-Filho, Jurandy Mauro
Silva, Fabyano Fonseca e
Guimarães, Simone Facioni
Waddington, Bruna
Costa, Eduardo Paulino da
León, Victor Gomez
Siqueira, Jeanne Broch
Okano, Denise Silva
Maitan, Paula Piccolo
Guimarães, José Domingos
Abstract: This study aimed to evaluate the correlation between testicular biometry and semen variables, as well as, to relate testicular variables to the probability of selecting Nellore bulls with desirable sperm morphology when conducting breeding soundness evaluations (BSE). A total of 2055 BSEs from 506 bulls comprised the dataset. Biometric variables evaluated were: scrotal circumference, testicular volume, width, length, ratio and eccentricity; and semen variables were sperm motility, major sperm defects, minor sperm defects and normal sperm. Data of testicular biometry were correlated with data for semen variables using the Pearson’s correlation assessment. Effects of testicular variables in selecting for sperm morphology of bulls in the BSE were evaluated by logistic regression. Scrotal circumference, testicular volume, length and width were positively correlated to sperm motility (0.18 to 0.19) and normal sperm (0.24 to 0.27) and negatively correlated with values for major defects (−0.24 to −0.27), but for testicular ratio and eccentricity there were coefficients near zero for all semen traits. Testicular ratio and eccentricity were not suitable for predicting the probability of selecting a bull based on semen variables using the BSE, but scrotal circumference, testicular volume, length and width were highly significant (P <  0.0001) with moderate values of area under ROC (Receiver Operating Characteristics) curve (0.608 to 0.620).
Palavras-chave: Animal breeding
Sperm morphology
Editor: Animal Reproduction Science
Tipo de Acesso: Elsevier B.V.
URI: https://doi.org/10.1016/j.anireprosci.2018.07.010
http://www.locus.ufv.br/handle/123456789/21918
Data do documento: Set-2018
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