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.
Guilherme Fazan Rossi
, Naiara Nantes Rodrigues
, Erika Aline Ribeiro Dias
, Natália Marins Bastos
, Dayane Priscila Vrisman
, Flávia Fernanda Simili
, [...]
25/Mar/2025
Guilherme Fazan Rossi
, Naiara Nantes Rodrigues
, Erika Aline Ribeiro Dias
, Natália Marins Bastos
, Dayane Priscila Vrisman
, Flávia Fernanda Simili
, [...]
ABSTRACT The objective of this study was to characterize the sexual development of 48 Nelore bulls by associating the findings of sperm analyses with growth traits and ultrasound-measured testicular traits. Bulls were evaluated from 14.3 to 24.6 months old at intervals of 28 days, totaling 12 observations per animal. Data were subjected to repeated-measures analyses of variance over time (PROC MIXED, SAS 9.2) and equations for semen traits were developed using stepwise regression (PROC REG, SAS 9.2). Regarding the growth […]
Keywords: bulls; sexual maturity; ultrasonography
01/Sep/2011
Tamires Miranda Neto, Erick Fonseca de Castilho, Rogério Oliveira Pinho, Simone Eliza Facioni Guimarães, Eduardo Paulino da Costa, José Domingos Guimarães
DOI: 10.1590/S1516-35982011000900011
The objective of this study was to determine the age at puberty and sexual maturity and its relationship with body weight and testicular measurements in Simmental young bulls raised under pasture conditions in a tropical climate. Forty-four young bulls at 1 to 30 months of age were used. Body and testicular measurements were made monthly and ejaculates collected fortnightly, from six months of age by using the method of electroejaculation. Age at puberty was 13.42 ± 3.02 months and sexual […]
Keywords: extensive farming; puberty; sexual maturity; Simmental; tropical climate
01/Mar/2010
Thiago da Silva Silveira, Jeanne Broch Siqueira, Simone Eliza Facioni Guimarães, Tarcízio Antônio Rêgo de Paula, Tamires Miranda Neto, José Domingos Guimarães
DOI: 10.1590/S1516-35982010000300008
The objective of this study was to verify the stage of sexual maturity, occurrence of the testicular format and the relationship among reproductive characteristics. Data were used from 5903 Nellore bulls averaging 21 months submitted to the soundness evaluation from 1999 to 2003. At the time of the evaluation, the following characteristics were recorded: scrotal circumference at soundness evaluation (31.99 ± 2.23 cm), left testicular length (11.21 ± 0.98 cm) and right testicular length (11.26 ± 0.97 cm), left testicular […]
Keywords: sexual maturity; testicle biometric; testicular format