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Abstract

Data from 294045 records from a crossbred Angus × Nellore population were used to estimate fixed genetic effects (both additive and non-additive) and to test different non-additive models using ridge regression. The traits studied included weaning gain (WG), postweaning gain (PG), phenotypic scores ...

Author(s)
Bertoli, C. D.; Braccini Neto, J.; McManus, C.; Cobuci, J. A.; Campos, G. S.; Piccoli, M. L.; Roso, V.
Publisher
CSIRO, Collingwood, Australia
Citation
Animal Production Science, 2019, 59, 5, pp 823-834
Abstract

The objective was to estimate genetic correlations between body weight (BW), scrotal circumference and visual evaluation scores of body conformation measured at standard ages in Guzerat cattle. All measurements were performed at 205 (weaning age), 365, 450 and 550 days of age; for BW, two...

Author(s)
Abreu, L. R. A.; Martins, P. G. M. A.; Mota, L. F. M.; Ferreira, T. A.; Ribeiro, V. M. P.; Villela, S. D. J.; Merlo, F. A.; Pires, A. V.
Publisher
Wiley, Tokyo, Japan
Citation
Animal Science Journal, 2018, 89, 9, pp 1223-1229
Abstract

The objectives of this study were to estimate heritability and genetic correlations for female traits (HR: heifer rebreeding; NC53: number of calves at 53 months of age; HP: heifer pregnancy at 18 months of age; AFC: age at first calving) and weight gains (BWG: from birth to weaning; WYG: from...

Author(s)
Schmidt, P. I.; Ferreira, I. A.; Silveira, D. D.; Campos, G. S.; Souza, F. R. P.; Carvalheiro, R.; Boligon, A. A.
Publisher
Elsevier B.V., Amsterdam, Netherlands
Citation
Livestock Science, 2019, 229, pp 77-84
Abstract

Castration is performed on bull calves to reduce aggressiveness and sexual activity, improve worker safety, prevent unwanted breeding, and improve meat quality. The objective of this study was to evaluate the effect of a zinc solution as an injectable castration method to bull calves before...

Author(s)
Ball, J. J.; Kegley, E. B.; Beck, P. A.; Apple, J. K.; Cox, D. R.; Powell, J. G.
Publisher
American Registry of Professional Animal Scientists (ARPAS), Champaign, USA
Citation
Professional Animal Scientist, 2018, 34, 2, pp 218-222
Abstract

Improving reproductive indexes is of extreme importance in beef cattle production systems, as well as investigating new methodologies and traits in order to increase genetic gains for reproduction. Reproductive efficiency directly affects the profitability and productivity of herds, being an...

Author(s)
Kluska, S.; Silva, L. O. C.; Maia, F. M. C.; Lourenco, D. L.; Stivanin, T. E.; Baldi, F.; Peripolli, E.; Martins, E. N.
Publisher
CIPAV Foundation, Cali, Colombia
Citation
Livestock Research for Rural Development, 2018, 30, 5, pp Article 82
AbstractFull Text

Background: Immunocastration is a less invasive and painless procedure compared to surgical castration, which causes greater stress to animals, especially when performed improperly. Immunocastration stimulates the production of antibodies against Gonadotropin-Releasing Hormone (GnRH), temporarily...

Author(s)
Withoeft, J. A.; Chiocca, M.; Santiani, F.; Costa, L. S. da; Mateus, K. A.; Santos, M. R. dos; Casagrande, R. A.; Cucco, D. de C.
Publisher
Universidade Federal do Rio Grande do Sul, Faculdade de Veterinária, Porto Alegre, Brazil
Citation
Acta Scientiae Veterinariae, 2019, 47,
Abstract

This study estimated the genetic variability and correlations between growth and reproductive traits in Nelore cattle. Annual genetic changes in female reproductive traits were also evaluated using repeated measures. Direct heritability was moderate for the growth traits and scrotal circumference...

Author(s)
Schmidt, P. I.; Campos, G. S.; Roso, V. M.; Souza, F. R. P.; Boligon, A. A.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2019, 128, pp 47-53
AbstractFull Text

The aim of this study was to investigate population structure and genetic trends based on pedigree and performance records of five indigenous African beef cattle breeds (Afrikaner, Boran, Drakensberger, Nguni and Tuli) in South Africa. Pedigree completeness over six generations was higher than...

Author(s)
Abin, S.; Theron, H. E.; Marle-Köster, E. van
Publisher
South African Society of Animal Science, Hatfield, South Africa
Citation
South African Journal of Animal Science, 2016, 46, 2, pp 152-156
Abstract

Principal component analysis (PCA) is used to summarize important information from multivariate data in sets of new variables named principal components (PCs). In animal breeding, these new composite variables can be used to study the associations among multiple traits using the magnitude and...

Author(s)
Vargas, G.; Schenkel, F. S.; Brito, L. F.; Neves, H. H. de R.; Munari, D. P.; Boligon, A. A.; Carvalheiro, R.
Publisher
Elsevier B.V., Amsterdam, Netherlands
Citation
Livestock Science, 2018, 217, pp 37-43
Abstract

In order to determine whether selection for traits included in the selection index used in a breeding program would increase the mature weight (MW) of females, this study analyzed the association between MW and four traits composing the index: weaning weight (WW), post-weaning weight gain in 345...

Author(s)
Silva, B. C. A.; Eler, J. P.; Santana, M. L.; Mattos, E. C.; Menezes, I. R.; Ferraz, J. B. S.
Publisher
Elsevier B.V., Amsterdam, Netherlands
Citation
Livestock Science, 2018, 211, pp 61-65

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