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.
Intake, total apparent digestibility, milk production and composition in early lactation cows fed with increasing levels of crude protein in the concentrate
The intake, total apparent digestibility of nutrients and milk production and composition were evaluated in early lactation cows fed with increasing levels (20; 23; 26 and 29% natural matter – NM) of crude protein (CP) in concentrate. Twelve crossbred Holstein cows were assigned to three latin square (4×4), in four periods of 15 days each (one week of adaptation). The feeding consisted of 60% of cow silage and 40% of concentrate. The intakes of dry matter (DM), CP, neutral detergent fiber (NDF), and total digestible nutrients (TDN) intakes increased linearly and the nonfiber carbohydrates (NFC) intake showed linear reduction as CP levels in the concentrate increased. DM, organic matter (OM), CP and NDF digestibilities increased linearly with CP levels. Milk production (MP), corrected MP, fat and protein levels in milk were not influenced by CP levels in the concentrate. Nonetheless, corrected MP for 3.5% fat was 29.08 kg/day in 26% of CP in NM of the concentrate. CP level of 26%, in a proportion of 40% concentrate, correspondent to 15.5% DM in the feed, showed better results of milk production, average of 28 kg/day, in early lactation of cows fed with corn silage.
Intake, total apparent digestibility, milk production and composition in early lactation cows fed with increasing levels of crude protein in the concentrate
Pereira,Mara Lúcia Albuquerque and Filho,Sebastião de Campos Valadares and Valadares,Rilene Ferreira Diniz and Campos,José Maurício de Souza and Leão,Maria Ignez and Pereira,César Augusto Ramos and Pina,Douglas dos Santos and Mendonça,Sandro de Souza. Intake, total apparent digestibility, milk production and composition in early lactation cows fed with increasing levels of crude protein in the concentrate. R. Bras. Zootec. [online]. 2005, vol.34, 3, [cited 2026-04-24], pp.1029-1039. Available from: <https://rbz.org.br/article/intake-total-apparent-digestibility-milk-production-and-composition-in-early-lactation-cows-fed-with-increasing-levels-of-crude-protein-in-the-concentrate/>. ISSN 1516-3598. http://doi.org/10.1590/S1516-35982005000300036.
Pereira,Mara Lúcia Albuquerque; Filho,Sebastião de Campos Valadares; Valadares,Rilene Ferreira Diniz; Campos,José Maurício de Souza; Leão,Maria Ignez; Pereira,César Augusto Ramos; Pina,Douglas dos Santos; Mendonça,Sandro de Souza. Intake, total apparent digestibility, milk production and composition in early lactation cows fed with increasing levels of crude protein in the concentrate. R. Bras. Zootec., v.34, 3, p. 1029-1039. Jun. 2005. Available from: <https://rbz.org.br/article/intake-total-apparent-digestibility-milk-production-and-composition-in-early-lactation-cows-fed-with-increasing-levels-of-crude-protein-in-the-concentrate/>. acess on 24 Apr. 2026. http://doi.org/10.1590/S1516-35982005000300036.
Pereira,Mara Lúcia Albuquerque, & Filho,Sebastião de Campos Valadares, & Valadares,Rilene Ferreira Diniz, & Campos,José Maurício de Souza, & Leão,Maria Ignez, & Pereira,César Augusto Ramos, & Pina,Douglas dos Santos, & Mendonça,Sandro de Souza. (2005). Intake, total apparent digestibility, milk production and composition in early lactation cows fed with increasing levels of crude protein in the concentrate. R. Bras. Zootec., 34(3) , 1029-1039. http://doi.org/10.1590/S1516-35982005000300036.
PereiraMara Lúcia Albuquerque, FilhoSebastião de Campos Valadares, ValadaresRilene Ferreira Diniz, CamposJosé Maurício de Souza, LeãoMaria Ignez, PereiraCésar Augusto Ramos, PinaDouglas dos Santos, MendonçaSandro de Souza. Intake, total apparent digestibility, milk production and composition in early lactation cows fed with increasing levels of crude protein in the concentrate. R. Bras. Zootec. [Internet]. 2005 Jun [cited 2026 Apr 24]; 34(3): 1029-1039. Available from: https://rbz.org.br/article/intake-total-apparent-digestibility-milk-production-and-composition-in-early-lactation-cows-fed-with-increasing-levels-of-crude-protein-in-the-concentrate/. http://doi.org/10.1590/S1516-35982005000300036.
Figure 6
Differential abundance for the species Faecalibacterium prausnitzii (A) and Megamonas funiformis (B).
