Reproductive success or failure in four breed groups of beef bulls

Content Provider	Scilit
Author	Menegassi, Sílvio Renato Oliveira Barcellos, Júlio Otávio Jardim Peripolli, Vanessa Dias, Eduardo Antunes Junior, João Batista Gonçalves Costa Vieira, Maitê De Moraes Moojen, Fernanda Gomes
Copyright Year	2015
Description	The objective of this study was to determine the main causes of failure in bull breeding using a soundness evaluation in Rio Grande do Sul State/Brazil. We evaluated 19,836 bulls from 15 different breeds with ages ranging from two to eight years. The failures of bulls in each step were analyzed by logistic regression. The binary logistic regression was applied because the response variable had only two responses: Success (1) and Failure (0). Older bulls are more likely to be rejected than are younger bulls, regardless of their genetic group. Depending on the step of the assessment, one or another group is rejected. All steps of bull breeding soundness evaluation (BBSE) are important, with special attention to the failures of the behavioral evaluation (libido and physical ability). A BBSE performed before the breeding season reduces the risk of sub-fertile bulls in the herd.
Related Links	http://www.scielo.br/pdf/rbz/v44n7/1516-3598-rbz-44-07-00240.pdf
Ending Page	247
Page Count	8
Starting Page	240
ISSN	15163598
e-ISSN	18069290
DOI	10.1590/s1806-92902015000700002
Journal	Revista Brasileira de Zootecnia
Issue Number	7
Volume Number	44
Language	English
Publisher	FapUNIFESP (SciELO)
Publisher Date	2015-07-01
Access Restriction	Open
Subject Keyword	Revista Brasileira de Zootecnia Agriculture and Animal Production Soundness Evaluation
Content Type	Text
Resource Type	Article
Subject	Animal Science and Zoology