The Revista Brasileira de Zootecnia (RBZ) is a publication dedicated to the broad field of Animal Science. We publish high-quality, original scientific research that spans across diverse areas within the discipline. The scope of RBZ encompasses a wide range of topics, including aquaculture, biometeorology and animal welfare, forage crops and grasslands, animal and forage plants breeding and genetics, animal reproduction, ruminant and non-ruminant nutrition, meat science and muscle biology, precision livestock, and animal production systems and agribusiness.
The Revista Brasileira de Zootecnia (RBZ) is a publication dedicated to the broad field of Animal Science. We publish high-quality, original scientific research that spans across diverse areas within the discipline. The scope of RBZ encompasses a wide range of topics, including aquaculture, biometeorology and animal welfare, forage crops and grasslands, animal and forage plants breeding and genetics, animal reproduction, ruminant and non-ruminant nutrition, meat science and muscle biology, precision livestock, and animal production systems and agribusiness.
The Revista Brasileira de Zootecnia (RBZ) is a publication dedicated to the broad field of Animal Science. We publish high-quality, original scientific research that spans across diverse areas within the discipline. The scope of RBZ encompasses a wide range of topics, including aquaculture, biometeorology and animal welfare, forage crops and grasslands, animal and forage plants breeding and genetics, animal reproduction, ruminant and non-ruminant nutrition, meat science and muscle biology, precision livestock, and animal production systems and agribusiness.
This study was conducted using data from single crosses (diallel) withim three female lines (PP, KK and VV). A completely randomized block design, with 81 single crosses treatments, three replicales with 81 broilers was used. The twelve production traits were: egg number during the periods of 24th-32nd, 32nd-40th, 40th-48th, 48th-56th, 56th-64th, 22nd-66th, 32nd-66th, 40th-66th, 48th-66th, 24th-40th, 24th-48th and 24th-56th weeks of age. The first two principal components explained more than 98% of total variance of the crosses means. In the study of the general combining ability (GCA), based on the scores of the first two principal componentes, the parent lines PP and VV were selected by GCA, for principal component1, however for the principal component 2 the parent line selected was PP.
General combining ability of egg production traits of broiler lines using principal components analysis
Abreu,Valéria Maria Nascimento and Silva,Martinho de Almeida e and Cruz,Cosme Damião and Figueiredo,Élsio Antônio Pereira de and Abreu,Paulo Giovanni de. General combining ability of egg production traits of broiler lines using principal components analysis. R. Bras. Zootec. [online]. 1999, vol.28, 5, [cited 2026-03-08], pp.955-959. Available from: <https://rbz.org.br/article/general-combining-ability-of-egg-production-traits-of-broiler-lines-using-principal-components-analysis/>. ISSN 1516-3598. https://doi.org/10.1590/S1516-35981999000500007.
Abreu,Valéria Maria Nascimento; Silva,Martinho de Almeida e; Cruz,Cosme Damião; Figueiredo,Élsio Antônio Pereira de; Abreu,Paulo Giovanni de. General combining ability of egg production traits of broiler lines using principal components analysis. R. Bras. Zootec., v.28, 5, p. 955-959. Sep. 1999. Available from: <https://rbz.org.br/article/general-combining-ability-of-egg-production-traits-of-broiler-lines-using-principal-components-analysis/>. acess on 08 Mar. 2026. https://doi.org/10.1590/S1516-35981999000500007.
Abreu,Valéria Maria Nascimento, & Silva,Martinho de Almeida e, & Cruz,Cosme Damião, & Figueiredo,Élsio Antônio Pereira de, & Abreu,Paulo Giovanni de. (1999). General combining ability of egg production traits of broiler lines using principal components analysis. R. Bras. Zootec., 28(5) , 955-959. https://doi.org/10.1590/S1516-35981999000500007.
AbreuValéria Maria Nascimento, SilvaMartinho de Almeida e, CruzCosme Damião, FigueiredoÉlsio Antônio Pereira de, AbreuPaulo Giovanni de. General combining ability of egg production traits of broiler lines using principal components analysis. R. Bras. Zootec. [Internet]. 1999 Sep [cited 2026 Mar 08]; 28(5): 955-959. Available from: https://rbz.org.br/article/general-combining-ability-of-egg-production-traits-of-broiler-lines-using-principal-components-analysis/. https://doi.org/10.1590/S1516-35981999000500007.
Figure 3
Ruminal disappearance of ash-free neutral detergent fiber (aNDFom) at 30 h of in situ incubation in corn husks (fresh and ensiled) treated with calcium oxide (CaO) and a mixture of corn heavy steep water and sugarcane molasses (HM).
