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.
In this study we examined the effects of the maternal age on the fecundity (absolute and relative), egg production, and fertilization rates of Nile tilapia (Oreochromis niloticus). Females were divided into three groups: Group 1 (6 years old), Group 2 (3 years old), and Group 3 (8 months old). Males of eight months were used in all groups. Twice a week, the females’ mouths were examined, and if they had eggs, these were removed and transferred to 2-L incubators. No difference was observed in the absolute fecundity between the different maternal age groups. Relative fecundity and egg production was greater in Group 3 (8 months) and fertilization rates were lower in Group 1 (6 years). Younger tilapias are more viable for egg production, because they have better reproductive indexes.
Maternal age influences on reproductive rates in Nile tilapia (Oreochromis niloticus)
Valentin,Fernanda Nogueira and Nascimento,Nivaldo Ferreira do and Silva,Regiane Cristina da and Tsuji,Eduardo Akira and Paes,Maria do Carmo Faria and Koberstein,Teresa Cristina Ribeiro Dias and Nakaghi,Laura Satiko Okada. Maternal age influences on reproductive rates in Nile tilapia (Oreochromis niloticus). R. Bras. Zootec. [online]. 2015, vol.44, 4, [cited 2026-04-24], pp.161-163. Available from: <https://rbz.org.br/article/maternal-age-influences-on-reproductive-rates-in-nile-tilapia-oreochromis-niloticus/>. ISSN 1516-3598. http://doi.org/10.1590/S1806-92902015000400005.
Valentin,Fernanda Nogueira; Nascimento,Nivaldo Ferreira do; Silva,Regiane Cristina da; Tsuji,Eduardo Akira; Paes,Maria do Carmo Faria; Koberstein,Teresa Cristina Ribeiro Dias; Nakaghi,Laura Satiko Okada. Maternal age influences on reproductive rates in Nile tilapia (Oreochromis niloticus). R. Bras. Zootec., v.44, 4, p. 161-163. Apr. 2015. Available from: <https://rbz.org.br/article/maternal-age-influences-on-reproductive-rates-in-nile-tilapia-oreochromis-niloticus/>. acess on 24 Apr. 2026. http://doi.org/10.1590/S1806-92902015000400005.
Valentin,Fernanda Nogueira, & Nascimento,Nivaldo Ferreira do, & Silva,Regiane Cristina da, & Tsuji,Eduardo Akira, & Paes,Maria do Carmo Faria, & Koberstein,Teresa Cristina Ribeiro Dias, & Nakaghi,Laura Satiko Okada. (2015). Maternal age influences on reproductive rates in Nile tilapia (Oreochromis niloticus). R. Bras. Zootec., 44(4) , 161-163. http://doi.org/10.1590/S1806-92902015000400005.
ValentinFernanda Nogueira, NascimentoNivaldo Ferreira do, SilvaRegiane Cristina da, TsujiEduardo Akira, PaesMaria do Carmo Faria, KobersteinTeresa Cristina Ribeiro Dias, NakaghiLaura Satiko Okada. Maternal age influences on reproductive rates in Nile tilapia (Oreochromis niloticus). R. Bras. Zootec. [Internet]. 2015 Apr [cited 2026 Apr 24]; 44(4): 161-163. Available from: https://rbz.org.br/article/maternal-age-influences-on-reproductive-rates-in-nile-tilapia-oreochromis-niloticus/. http://doi.org/10.1590/S1806-92902015000400005.
Figure 6
Differential abundance for the species Faecalibacterium prausnitzii (A) and Megamonas funiformis (B).
