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Abstract

Random regression models (RRM) differ in terms of the functions used to describe the shape of lactation curves. The aim was to compare random regression models under different functions to describe the lactation curves from Holstein cows in herds of the state of Minas Gerais. A database of 28,118...

Author(s)
Azevedo Junior, J.; Gonçalves, T. de M.; Souza, J. C. de; Rodriguez, M. A. P.; Costa, C. N.; Carvalheira, J. G. V.
Publisher
Canadian Center of Science and Education, Toronto, Canada
Citation
Journal of Agricultural Science (Toronto), 2018, 10, 2, pp 1-14
Abstract

Test-day milk, fat and protein yields and somatic cell score (SCS) of Brazilian Holstein cattle were used to study the effect of fixed (HTDF) vs random (HTDR) contemporary groups (herd-test-date) with or without unknown parent groups (UPG) using an autoregressive test-day animal model for genetic...

Author(s)
Silva, D. A. da; Costa, C. N.; Silva, A. A. da; Fonseca e Silva, F.; Lopes, P. S.; Santos, G. G. dos; Thompson, G.; Carvalheira, J.
Publisher
Elsevier B.V., Amsterdam, Netherlands
Citation
Livestock Science, 2019, 220, pp 1-7
Abstract

We evaluated the population genetic structure of the Holstein breed in Brazil through pedigree analysis with the aim of supporting genetic management of extant herds. We used data from genealogical records of 204,511 animals in farms from south and southeast Brazil. Pedigree records between 1943...

Author(s)
Silva, M. H. M. A. da; Malhado, C. H. M.; Costa, J. L., Jr.; Cobuci, J. A.; Costa, C. N.; Carneiro, P. L. S.
Publisher
Springer, Amsterdam, Netherlands
Citation
Tropical Animal Health and Production, 2016, 48, 2, pp 331-336
Abstract

The objective was to estimate the genetic parameters for the cow's ability to stay in the herd (stayability) until 48 and 54 months of age (STAY48 and STAY54) and up to 36 and 48 months after the first calving (STAY36ac and STAY48ac), and their associations with 305-day milk production (MP305) in...

Author(s)
Rocha, G. M. F.; Cobuci, J. A.; Costa, C. N.; Abreu, L. R. A.; Mota, L. F. M.; Pires, A. V.; Villela, S. D. J.; Martins, P. G. M. A.
Publisher
CSIRO, Collingwood, Australia
Citation
Animal Production Science, 2018, 58, 10, pp 1788-1793
Abstract

This article discusses the implementation of progeny testing; breeding programme; molecular markers; genotyping; morphological conformation; genetic improvement; zootechnical performance; and distribution of semen progeny test of Girolando dairy bulls in Brazil.

Author(s)
Silva, M. V. G. B. da; Paiva, L. de C.; Cembranelli, M. de A. R.; Martins, M. F.; Rodrigues, W. B. R.; Arbex, W. A.; Bruneli, F. A. T.; Panetto, J. C. do C.; Costa, C. N.; Santos, G. G. dos; Carvalho, B. C. de
Publisher
Embrapa Gado de Leite, Juiz de Fora, Brazil
Citation
Documentos - Embrapa Gado de Leite, 2012, No.154, pp 52 pp.
Abstract

This article summarizes the selection programme; increased production through the development or improvement of the genetic potential of the animals; and compliance of the guidelines on productivity, quality and sustainability of Holstein dairy bulls in Brazil.

Author(s)
Costa, C. N.; Cobuci, J. A.; Marques, A.; Ribas Neto, P. G.; Valloto, A. A.; Horst, J. A.; Mendonça Júnior, C. F. de; Oliveira, F. O. F.; Bruneli, F. Â. T.; Panetto, J. C. do C.; Campos, L. S.; Rigon, J. L.; Pereira, V. H. M.; Silva, M. V. G. B. da; Martins, M. F.; Freitas, A. F. de
Publisher
Embrapa Gado de Leite, Juiz de Fora, Brazil
Citation
Documentos - Embrapa Gado de Leite, 2012, No.158, pp 40 pp.
Abstract

This paper presents the activities of the Association of Brazilian Cattle Breeders and the dairy performance, milk recording results, conformation, genetic analysis for 2010 and importance of Holstein-Friesian cattle in the dairy industry of Brazil.

Author(s)
Costa, C. N.; Freitas, A. F. de; Cobuci, J. A.; Valloto, A. A.; Ribas Neto, P. G.; Silva, M. V. G. B. da; Guimarães, M. F. M.; Horst, J. A.; Mendonça Júnior, C. F. de; Campos, L. de S.; Marquez, A.; Souza, M. A. de
Publisher
Embrapa Gado de Leite, Juiz de Fora, Brazil
Citation
Documentos - Embrapa Gado de Leite, 2010, No.140, pp 68 pp.
Abstract

Longevity is an important trait due to its relationship with profitability. Type traits have been used as indirect predictors for productive life. The objective of this study was to evaluate the relationship of 20 type traits on length of productive life in Brazilian Holsteins, using a piecewise...

Author(s)
Kern, E. L.; Cobuci, J. A.; Costa, C. N.; Ducrocq, V.
Publisher
Universidade de Sao Paulo, Campus "Luiz de Queiroz" (ESALQ), Piracicaba, Brazil
Citation
Scientia Agricola, 2018, 75, 6, pp 470-478
Abstract

In 1998, a total of 150.27 million zebu cattle was counted in Brazil, of which 64.7, 20.6, 13.8 and 0.9% respectively were beef, milk, dual-purpose and draught animals. Between 1939 and 1998, 66.67, 11.58, 8.39, 5.0 and 4.12% of herdbook animals were of the Nelore, Gir, Polled Nelore,...

Author(s)
Machado, C. H. C.; Costa, C. N.
Publisher
EMBRAPA, Gado de Leite , Juiz de Fora, Braxil
Citation
Anais do 2o Minas Leite. Avanços tecnológicos para o aumento da produtividade leiteira, 2000, pp 41-45
Abstract

The aim of this study was to compare two random regression models (RRM) fitted by fourth (RRM4) and fifth-order Legendre polynomials (RRM5) with a lactation model (LM) for evaluating Holstein cattle in Brazil. Two datasets with the same animals were prepared for this study. To apply test-day RRM...

Author(s)
Padilha, A. H.; Cobuci, J. A.; Costa, C. N.; Braccini Neto, J.
Publisher
Asian-Australasian Association of Animal Production Societies, Seoul, Korea Republic
Citation
Asian-Australasian Journal of Animal Sciences, 2016, 29, 6, pp 759-767

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