Energy partitioning in cattle fed diets based on tropical forage with the inclusion of antibiotic additives

• DOI: 10.1371/journal.pone.0211565
• Publication Date: 2019-04-22T17:29:33Z
• Authors: Marcelina Pereira...; Ana Luiza da Cost...; Pedro Henrique de...; Ricardo Reis e Silva; Lúcio Carlos Gonç...; Iran Borges; Helena Ferreira Lage; Alexandre Lima Fe...; Eloísa Oliveira S...; Diogo Gonzaga Jayme; Joana Ribeiro da ...; Décio Souza Graça; Rodrigo Melo Meneses; Antônio Último de...; Elias Jorge Facur...; Arthur Alves Silva
• Keywords: Monensin; Virginiamycin; Panicum; Beef Cattle

The aim of this study was to describe energy partitioning in dairy crossbreed bulls fed tropical forage-based diets supplemented with different additives. Twenty F1 crossbred (Holstein x Gyr) initial and final live weight (LW) averages 190 ± 17 275 20 kg were sorghum (Sorghum bicolour) Tanzania grass (Panicum maximum cv. Tanzania) silage (70:30 DM basis) concentrate at a forage ratio 50:50. allocated four treatment: control groups (without additives), monensin [22 mg/kg dry matter (DM)] (M), virginiamycin (30 DM) (V), combination (22 30 virginiamycin) (MV), completely randomised design. intake gross (GE, MJ/d), digestible (DE, metabolizable (ME, as well losses the form faeces, urine, methane, heat production (HE), retained (RE) measured. Faecal output measured apparent digestibility trial. Right after trial, urine samples collected order estimate daily urinary animals. Heat methane an open circuit respirometry chamber. GE, DE, ME animals receiving alone or (MV) showed no differences (P>0.05) from treatment. However, MV treatment reduced (P<0.05) (5.44 MJ/d) compared group (7.33 expressed MJ per day, but not when related (GEI) (CH4, % GEI) (P = 0.34). Virginiamycin did change utilization efficiency for gain, RE net gain energy. This that cattle forages, feed additives affected their metabolism by reduction lost methane.