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.
Chromium oxide and n-alkanes (C31:C32 and C33:C32) were used to estimate the dry matter intake (DMI) of lactating Holstein x Zebu cows grazing elephant grass. Extrusa samples of forage were obtained from a cow with esophageal fistula. Fecal grab collection was done twice a day at 7:30 and 14:30 h during 9 days in each experimental period. A randomized complete block design with a split-plot arrangement was used. Both pairs of n-alkanes estimated similar DMI, independent of time of fecal collection, suggesting that one single daily collection of feces may be adequate. Independent of the fecal collection schedule, DMI estimated by Cr2O3 or n-alkanes differed significantly by the Tukey test. Dry matter intake estimated by Cr2O3 was closer to that predicted according to the available forage (2.6% body weight, BW) and the NRC (2001) model (2.7% BW). Therefore, DMI estimated by Cr2O3 is likely to be more accurate than n-alkanes. In addition, Cr2O3 is inexpensive and easy to analyze.
Use of chromium oxide or n-alkanes to estimate forage intake of grazing lactating cows
Morenz,Mirton José Frota and Silva,José Fernando Coelho da and Aroeira,Luiz Januário Magalhães and Deresz,Fermino and Vásquez,Hernan Maldonado and Paciullo,Domingos Sávio Campos and Lopes,Fernando César Ferraz and Elyas,Ana Cristina Wyllie and Detmann,Edenio. Use of chromium oxide or n-alkanes to estimate forage intake of grazing lactating cows. R. Bras. Zootec. [online]. 2006, vol.35, 4, [cited 2026-04-24], pp.1535-1542. Available from: <https://rbz.org.br/article/use-of-chromium-oxide-or-n-alkanes-to-estimate-forage-intake-of-grazing-lactating-cows/>. ISSN 1516-3598. https://doi.org/10.1590/S1516-35982006000500036.
Morenz,Mirton José Frota; Silva,José Fernando Coelho da; Aroeira,Luiz Januário Magalhães; Deresz,Fermino; Vásquez,Hernan Maldonado; Paciullo,Domingos Sávio Campos; Lopes,Fernando César Ferraz; Elyas,Ana Cristina Wyllie; Detmann,Edenio. Use of chromium oxide or n-alkanes to estimate forage intake of grazing lactating cows. R. Bras. Zootec., v.35, 4, p. 1535-1542. Aug. 2006. Available from: <https://rbz.org.br/article/use-of-chromium-oxide-or-n-alkanes-to-estimate-forage-intake-of-grazing-lactating-cows/>. acess on 24 Apr. 2026. https://doi.org/10.1590/S1516-35982006000500036.
Morenz,Mirton José Frota, & Silva,José Fernando Coelho da, & Aroeira,Luiz Januário Magalhães, & Deresz,Fermino, & Vásquez,Hernan Maldonado, & Paciullo,Domingos Sávio Campos, & Lopes,Fernando César Ferraz, & Elyas,Ana Cristina Wyllie, & Detmann,Edenio. (2006). Use of chromium oxide or n-alkanes to estimate forage intake of grazing lactating cows. R. Bras. Zootec., 35(4) , 1535-1542. https://doi.org/10.1590/S1516-35982006000500036.
MorenzMirton José Frota, SilvaJosé Fernando Coelho da, AroeiraLuiz Januário Magalhães, DereszFermino, VásquezHernan Maldonado, PaciulloDomingos Sávio Campos, LopesFernando César Ferraz, ElyasAna Cristina Wyllie, DetmannEdenio. Use of chromium oxide or n-alkanes to estimate forage intake of grazing lactating cows. R. Bras. Zootec. [Internet]. 2006 Aug [cited 2026 Apr 24]; 35(4): 1535-1542. Available from: https://rbz.org.br/article/use-of-chromium-oxide-or-n-alkanes-to-estimate-forage-intake-of-grazing-lactating-cows/. https://doi.org/10.1590/S1516-35982006000500036.
Figure 6
Differential abundance for the species Faecalibacterium prausnitzii (A) and Megamonas funiformis (B).
