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 to determine optimum test duration for measuring performance, feed intake and feed efficiency. Sixty young Nellore bulls were submitted to feeding performance test and fed in individual pens to determine feed intake and performance over 112 days. Body weight was determined every 28 days, after fasting of water and feed for 16 hours. Changes in variance, relative variance and Pearson and Spearman correlations among data from shortened test periods (28, 56 and 84 days) and full test period (112 days) were used to determine optimum test duration. Test duration for average daily gain, dry matter intake, feed:gain ratio and residual feed intake could be shortened to 84, 28, 84 and 84 days, respectively, without reducing significantly the reliability of measurements for animals fed in individual pens.
Test post-weaning duration for performance, feed intake and feed efficiency in Nellore cattle
Castilhos,André Michel de and Branco,Renata Helena and Razook,Alexander George and Bonilha,Sarah Figueiredo Martins and Mercadante,Maria Eugênia Zerlotti and Figueiredo,Leopoldo Andrade de. Test post-weaning duration for performance, feed intake and feed efficiency in Nellore cattle. R. Bras. Zootec. [online]. 2011, vol.40, 2, [cited 2026-10-11], pp.301-307. Available from: <https://rbz.org.br/article/test-post-weaning-duration-for-performance-feed-intake-and-feed-efficiency-in-nellore-cattle/>. ISSN 1516-3598. http://doi.org/10.1590/S1516-35982011000200010.
Castilhos,André Michel de; Branco,Renata Helena; Razook,Alexander George; Bonilha,Sarah Figueiredo Martins; Mercadante,Maria Eugênia Zerlotti; Figueiredo,Leopoldo Andrade de. Test post-weaning duration for performance, feed intake and feed efficiency in Nellore cattle. R. Bras. Zootec., v.40, 2, p. 301-307. Feb. 2011. Available from: <https://rbz.org.br/article/test-post-weaning-duration-for-performance-feed-intake-and-feed-efficiency-in-nellore-cattle/>. acess on 11 Oct. 2026. http://doi.org/10.1590/S1516-35982011000200010.
Castilhos,André Michel de, & Branco,Renata Helena, & Razook,Alexander George, & Bonilha,Sarah Figueiredo Martins, & Mercadante,Maria Eugênia Zerlotti, & Figueiredo,Leopoldo Andrade de. (2011). Test post-weaning duration for performance, feed intake and feed efficiency in Nellore cattle. R. Bras. Zootec., 40(2) , 301-307. http://doi.org/10.1590/S1516-35982011000200010.
CastilhosAndré Michel de, BrancoRenata Helena, RazookAlexander George, BonilhaSarah Figueiredo Martins, MercadanteMaria Eugênia Zerlotti, FigueiredoLeopoldo Andrade de. Test post-weaning duration for performance, feed intake and feed efficiency in Nellore cattle. R. Bras. Zootec. [Internet]. 2011 Feb [cited 2026 Oct 11]; 40(2): 301-307. Available from: https://rbz.org.br/article/test-post-weaning-duration-for-performance-feed-intake-and-feed-efficiency-in-nellore-cattle/. http://doi.org/10.1590/S1516-35982011000200010.
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).
