Performance, digestibility, microbial production and carcass characteristics of feedlot young bulls fed diets containing propolis/Desempenho, digestibilidade, producao microbiana e caracteristicas de carcaca de bovinos confinados que receberam dietas contendo propolis

• Published in: Acta scientiarum. Animal sciences Vol. 34; no. 4; pp. 393 - 400
• Main Authors: de Aguiar, Silvia Cristina, Zeoula, Lucia Maria, de Moura, Lucimar Pontara Peres, do Prado, Ivanor Nunes, de Paula, Eduardo Marostegan, Samensari, Rafael Barreiros
• Format: Journal Article
• Language: English; Spanish
• Published: Universidade Estadual de Maringa 01-10-2012; Editora da Universidade Estadual de Maringá (Eduem)
• Subjects: additive; aditivo; Diet; eficiência de síntese microbiana; Feedlots; flavonoides; flavonoids; Isoflavones; meat quality; microbial efficiency; qualidade de carne; ruminant; ruminante
• ISSN: 1806-2636; 1807-8672
• DOI: 10.4025/actascianimsci.v34i4.15167

The objective was to evaluate the effect of propolis-based products (PBP) on performance, digestibility, microbial production and carcass characteristics of feedlot young bulls. Twenty-seven crossbred young bulls were used, with 353 [+ or -] 28 kg of body weight in a completely randomized experimental design, divided in three treatments: two diets with PBP with different dosages (PBP1 = 0.018 mg [g.sup.-1] and PBP2= 0.036 mg [g.sup.-1] of total flavonoids in chrysin) and control diet (CON). To determine total digestibility, the indigestible dry matter was used as an internal marker, while microbial production was estimated from purine derivatives in urine, collected by the spot method. The evaluated carcass characteristics were: hot carcass weight, dressing percentage, conformation, Longissimus muscle area, fat thickness, colour, texture, marbling, pH, cushion thickness and percentages of muscle, bone and fat. The studied variables were subjected to analysis of variance with 5% probability. The addition of propolis had no effect on DM and nutrients digestibility (except the ADF, which was higher) or efficiency of microbial synthesis. Carcass characteristics were not affected by the experimental treatments. The PBP in the used dosages should be reviewed and higher dosages should be tested. Keywords: additive, flavonoids, meat quality, microbial efficiency, ruminant. Objetivou-se avaliar o efeito de produtos a base de propolis (PBP) sobre o desempenho, digestibilidade, producao microbiana e caracteristicas de carcaca de bovinos confinados. Foram utilizados 27 bovinos com 353 [+ or -] 28 kg de peso corporal em um delineamento inteiramente casualizado dividido em tres tratamentos: duas dietas contendo PBP em diferentes dosagens (PBP1 = 0.018 mg [g.sup.-1] e PBP2 = 0.036 mg [g.sup.-1] de flavonoides totais em crisina) e dieta controle (CON) sem adicao de propolis. Para a determinacao da digestibilidade total, a materia seca indigestivel foi usada como marcador interno, enquanto a producao microbiana foi estimada pelos derivados de purina na urina, coletadas pelo metodo spot. As caracteristicas de carcaca avaliadas foram: peso de carcaca quente, rendimento de carcaca quente, conformacao, area de olho de lombo, espessura de gordura, coloracao, textura, marmoreio, pH, espessura de coxao e percentagens de musculo, osso e gordura. As variaveis estudadas foram submetidas a analise de variancia com 5% de probabilidade. A adicao da propolis nao teve efeito sobre a digestibilidade da MS e nutrientes (exceto para FDA, que foi maior) e eficiencia de sintese microbiana. As caracteristicas de carcaca nao foram afetadas pelos tratamentos experimentais. As dosagens utilizadas nos PBP devem ser revistas e dosagens mais elevadas devem ser testadas. Palavras-chave: aditivo, flavonoides, qualidade de carne, eficiencia de sintese microbiana, ruminante.