Title:	Macromineral requirements by beef cattle under pasture supplementation.
Authors:	SALES, M. F. L. PAULINO, M. F. VALADARES FILHO, S. de C. PORTO, M. O. COUTO, V. R. M. PAULINO, P. V. R.
Affiliation:	MAYKEL FRANKLIM LIMA SALES, CPAF-AC; Mário Fonseca Paulino, UFV; Sebastião de Campos Valadares Filho, UFV; Marlos Oliveira Porto, UFV; Victor Rezende Moreira Couto, UFV; Pedro Veiga Rodrigues Paulino, UFV.
Date Issued:	2011
Citation:	Revista Brasileira de Zootecnia, Viçosa, v. 40, n. 2, p. 426-432, 2011.
Description:	The objective of this work was to determine macromineral requirements by Zebu steers grazing Brachiaria decumbens supplemented with concentrate. It was used 24 non-castrated steers, at an average age of 7 months and at initial average weight 180 kg. Eight control animals were slaughtered for determining initial body composition. The 16 remaining animals were divided in four four-animal plots, in a complete random design. Each plot received mineral mixture or supplements at the levels 0.75; 1.50 or 2.25 kg/animal/day. The right half-carcass of eight animals, two per group, was dissected in muscle, fat and bones and all body constituents were weighted for determination of empty body weight and body composition. Net requirements of calcium and phosphorus for an animal at 400 kg body weight were 11.13 g and 5.40 g, respectively. To estimate dietary requirements of maintenance and after, sum them to dietary requirements for gain in order to obtain total dietary requirements, it was adopted endogenous losses and bioavailability present in literature for each mineral macroelement. Total dietary requirement for calcium, phosphorus, magnesium, sodium and potassium for a 400-kg BW animal with 1.0-kg daily weight gain were 34.59; 17.36; 7.82; 5.19 and 41.11 g/day, respectively. Macromineral requirements by beef cattle under pasture supplementation are similar to those recommended by BR-Corte for beef cattle in feedlots.
Thesagro:	Gado de corte Gado Zebu Novilho de corte Nutrição animal Pastagem Gramínea forrageira Capim Brachiaria Brachiaria decumbens Suplemento mineral Cálcio Fósforo Magnésio Sódio Potássio
NAL Thesaurus:	Beef cattle Zebu Steers Animal nutrition Pastures Forage grasses Dietary mineral supplements Calcium Phosphorus Magnesium Sodium Potassium
Keywords:	Beef steer Nutrición animal Becerros castrados Cebú Ganado de carne Pastizales Pastos forrajeros Suplementos dietéticos minerales
ISSN:	1806-9290
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CPAF-AC)