Características andrológicas e do sêmen de touros do composto Red Norte (Nelore x Tabapuã x Red Angus x Sinepol)

Rossi, Robson Marcelo; Filho, J. B. Barreto; Carvalho, Pablo Henrique Andrade; Lopes, E.; Gonçalvez, T.M.

doi:10.1590/s0102-09352009000600007

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…It includes a general physical examination, examination of the external and internal genital tract, measurement of scrotal circumference, evaluation of the physical and morphological aspects of the semen, and sexual behavior assessment (Fonseca, 2009;CBRA, 1998). Rossi et al (2009) evaluated yearling bulls and showed that sperm pathologies decrease as scrotal circumference increases. Scrotal circumference is easy to measure, and should be considered an important step of breeding soundness evaluation.…”

Section: Introductionmentioning

confidence: 99%

Causes of rejection of beef bulls in breeding soundness evaluation

et al. 2012

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-The objective of this study was to analyze the rates of rejection in the different steps of the breeding soundness evaluation of beef bulls in the state of Rio Grande do Sul, Brazil. The breeding soundness of 22,113 young and mature bulls of 14 beef breeds, participating in the Program of Reproductive Evaluation (PARTO) was evaluated in the experiment.Data concerning to the causes of rejection in the four steps of the breeding soundness evaluation (general physical examination, genital tract examination, semen evaluation and sexual behavior assessment) were analyzed by the Chi-square test and univariate regression analysis. According to year, general physical examination, genital tract examination and semen evaluation determined the rejection of 0.9% to 2.5%, 5.1% to 7.7%, 1.8% to 5.3%; and 4.2% to 6.7%, 7.3 to 9.3%, and 2.5% to 5.5% of young and mature bulls, respectively. Mature bulls presented higher chances of rejection than young bulls in the general physical examination in every year evaluated; as to the genital tract examination, their chances of rejection were higher in years I and II, but not in year III. In the semen evaluation, there was no difference between the ages assessed in any of the three years evaluated. Sexual behavior assessment accounted for the rejection of 1.9 to 6.0% of the young bulls and 2.9% to 3.9% of mature bulls, in accordance with the years evaluated; in years I and II, mature bulls presented higher rejection rates than young bulls. These results confirm the importance of performing all steps of the breeding soundness evaluation, including the sexual behavior assessment as a work routine, rather than an additional, optional stage of the evaluation, which should be carried out before the breeding season. The results indicate the relationship between bull age and rejection rate in the breeding soundness evaluation.

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Section: Introductionmentioning

confidence: 99%

Causes of rejection of beef bulls in breeding soundness evaluation

et al. 2012

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“…The test of sexual behavior is easy to perform and an important BBSE step (Rossi et al, 2009). On the other hand, dental conditions and structural lesions have been the main causes of culling in adult bulls, while testicular hypoplasia is the main cause of culling in young bulls (Acuña and Campero, 1997).…”

Section: Introductionmentioning

confidence: 99%

Reproductive success or failure in four breed groups of beef bulls

et al. 2015

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-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.

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Características andrológicas e do sêmen de touros do composto Red Norte (Nelore x Tabapuã x Red Angus x Sinepol)

Cited by 2 publications

References 15 publications

Causes of rejection of beef bulls in breeding soundness evaluation

Causes of rejection of beef bulls in breeding soundness evaluation

Reproductive success or failure in four breed groups of beef bulls

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