Monensina sódica e Saccharomyces cerevisiae em dietas para bovinos: fermentação ruminal, digestibilidade dos nutrientes e eficiência de síntese microbiana

Abstract

RESUMO -Avaliaram-se os efeitos do uso de monensina sódica, Saccharomyces cerevisiae e da mistura de ambos na dieta de bovinos sobre o pH e a concentração de amônia no rúmen, a digestibilidade aparente parcial e total dos nutrientes e a síntese de proteína microbiana no rúmen. Foram utilizados quatro bovinos da raça Holandesa Preto e Branco, castrados, com 320 kg de peso vivo, e canulados no rúmen. O delineamento experimental utilizado foi o quadrado latino 4 × 4, e os tratamentos consistiram de doses diárias de: 200 mg de monensina sódica (100I); 100 mg monensina sódica + 2,5 g Saccharomyces cerevisiae (50IP); 200 mg de monensina sódica + 5 g Saccharomyces cerevisiae (100IP); e 5 g Saccharomyces cerevisiae (100P), fornecidos diariamente pela cânula ruminal. A dieta contendo 100I promoveu menor digestão intestinal e total da matéria seca (MS), maior digestão intestinal da fibra em detergente neutro (FDN) e do extrato etéreo (EE), maior digestão total da proteína bruta (PB) e do EE e maior coeficiente de digestibilidade aparente ruminal (CDAR) e total (CDAT) da PB. A dieta contendo 100P resultou em menor digestão ruminal da PB, maior digestão ruminal da FDN, maior digestão intestinal da matéria orgânica (MO), da PB e dos carboidratos não-fibrosos (CNF), maior digestão total da matéria orgânica e do extrato etéreo, maior CDAR da FDN, maior coeficiente de digestibilidade intestinal (CDAI) da MO e dos CNF e maior CDAT da MO. A dieta 100P promoveu maior fluxo omasal de nitrogênio bacteriano e maior eficiência microbiana aparente e verdadeira. A dieta com 5 g/dia de Saccharomyces cerevisiae apresentou valor de NDT superior ao das outras dietas. As dietas não diferem quanto ao pH e à concentração de amônia no rúmen.Palavras-chave: levedura, microrganismos celulolíticos, probióticos, produção microbiana Sodium monensin and Saccharomyces cerevisiae in cattle diets: ruminal fermentation, nutrient digestibility and microbial synthesis efficiency ABSTRACT -The study was conducted to evaluate effects of sodium monensin, Saccharomyces cerevisiae and a mixture of both, in cattle diets, on ruminal pH and ammonia concentration, partial and total nutrient digestibility, and microbial protein synthesis in the rumen. Four Holstein steers weighting 320 kg and cannulated in the rumen were used.A 4 × 4 Latin square experimental design was used and treatments consisted of daily intake of: 200 mg of sodium monensin (100I); 100 mg of sodium monensin + 2.5 g of Saccharomyces cerevisiae (50IP); 200 mg sodium monensin + 5 g Saccharomyces cerevisiae (100IP), and 5 g Saccharomyces cerevisiae (100P) supplied daily through the ruminal canula.The diets containing 100I showed lower intestinal and total DM digestion, higher intestinal digestion of neutral detergent fiber (NDF) and ether extract (EE), higher total digestion of crude protein (CP) and ether extract (EE) and higher apparent ruminal and total CP digestibility. The diets containing 100P showed lower ruminal CP digestion, higher ruminal NDF digestion, higher intestinal digestion of OM, C...

Active yeast (Saccharomyces cerevisiae) supplementation improves digestibility of lamb diet¹

“…So this collection methodology may not be efficient on this case and can explain why did not show effect. These results are similar to those found by [13] and [18] that did not observe significant statistical differences in rumen pH of cattle supplemented with active yeast.…”

“…This result shows that the use of active yeast improves feed energy availability for animal and can be used for enhancing animal performance. These results are similar to those obtained by [13], who found higher TDN values when adding S. cerevisiae to cattle diet. However [14] did not report differences in TDN values when supplementing cattle diets with active yeast.…”

Performance, carcass characteristics and non-carcass components of Texel × Santa Inês lambs fed fat sources and monensin

“…Ionophores, like sodium monensin, are a group of additives that improve animal performance by controlling the rumen populations involved in the fermentation processes that are inefficient or harmful to animal performance (Fereli et al, 2010) .…”

Behavior patterns of cows with Charolais or Nellore breed predominance fed diets with plant extract or monensin sodium

“…This occurs due to changes in the microbial population in the rumen and in the animal digestive metabolism, improving the efficiency of energetic and protein metabolism and enhancing animal performance (Russell & Strobel, 1989). When evaluating the inclusion of 200 mg of sodium monensin/animal/day in the diet of Holstein steers, Fereli et al (2010) did not see differences (P>0.05) in dry matter intake, although they noticed an increase of the ruminal and total digestibility of the protein.…”