Eficiência de síntese microbiana e atividade enzimática em bovinos submetidos à suplementação com enzimas fibrolíticas

Abstract

RESUMO -Avaliou-se o efeito da suplementação com enzimas fibrolíticas (celulase e xilanase) sobre a eficiência de síntese microbiana e a atividade enzimática da β-1,4-endoglucanase (celulase) em animais consumindo dietas contendo silagem de milho e feno de tifton 85 (Cynodon spp.) como volumoso. Oito bovinos com fístulas no rúmen e no duodeno foram distribuídos em dois quadrados latinos 4 x 4, em esquema fatorial 2 x 2 (duas fontes de volumoso e adição ou não de enzimas). O complexo enzimático, proveniente de fonte comercial e extraído dos fungos Aspergillus niger e Trichoderma longibrachiatum, foi fornecido misturado à ração total na proporção de 12 g/animal/dia. A adição de enzimas às dietas contendo silagem de milho did not differ and averaged 78.2 and 52.5 g/day and 89.6 and 76.3 g/day for corn silage and Tifton hay, respectively. Supplementation with fibrolytic enzymes had no effect on the ruminal parameters of cattle fed hay or corn silage.

<b>Black pepper (<i>Piper nigrum</i>) in diets for laying hens on performance, egg quality and blood biochemical parameters

“…In this context, the additives are used in animal nutrition aiming at animal welfare and maximum performance, and are not harmful to animals and humans, should not leave residues in consumer products and should not contaminate the environment (Russell & Houlihan, 2003). Among the most currently studied and used additives stand out organic acids (Mroz, 2005), plants and their extracts (Santurio et al, 2007;Valero et al, 2016;Valero et al, 2014), enzymes (Martins, Vieira, Berchielli, Prado, & Paula, 2007;Martins, Vieira, Berchielli, Prado, & Garcia, 2006), probiotics and prebiotics (Maiorka, Santin, Sugeta, Almeida, & Macari, 2001), which hitherto have shown promising results (Santurio et al, 2007). Phytogenic additives have gained the attention of researchers, because they act preventing common diseases in animals and also in maintaining health.…”

<b>Bacterial diversity in bovine rumen by metagenomic 16S rDNA sequencing and scanning electron microscopy

“…If the symbiotic relationship between the host and microorganisms is one of the most relevant factors in taking the best advantage from the diet, or rather, a greater efficiency in the use of energy and proteins by the animals, the understanding of the structure of this microbial community and its factors is mandatory for the development of new production technologies (Martins et al, 2007;Martins et al, 2006).…”

<b>Performance of beef cattle bulls in feed lots and fed on diets containing enzymatic complex

“…There are several variation sources that affect responses to exogenous responses, such as its stability and activity in the rumen environment Martins et al, 2006c;Martins et al, 2008). Nozière et al (2014) did not report any positive effects on animal performance with enzyme supplementation higher than doses in current experiment, even though the inclusion of exogenous amylolytic enzymes increased by 8% the degradability of starch in the rumen without any increase in starch digestibility in the entire digestive tract.…”