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 2026-10-08], 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 Oct. 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 Oct 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 9
Differential abundance of taxa between treatments for Fimenecus sp004556705 (A) and NSJ-53 sp014384795 (B) species on day 21 of lactation in 8 sows per treatment fed to one of three dietary treatments: 1) a diet containing xylanase (Control; valorization of 40 kcal of ME/kg diet, CD40), 2) CD40 + β-mannanase (0.3 g/kg, valorization of 45 kcal ME/kg diet, CD85), and 3) CD40 + β-mannanase (0.3 g/kg, valorization of 60 kcal ME/kg diet, CD100).
