Cinética de fermentação ruminal in vitro de silagens de híbridos de sorgo

Abstract

RESUMOObjetivou-se com esta pesquisa avaliar as silagens de 23 híbridos de sorgo por meio da técnica in vitro semiautomática de produção de gases. Foi utilizado o delineamento inteiramente ao acaso, com 23 tratamentos e três repetições, sendo os tratamentos as silagens de híbridos de sorgo.

Silage quality of six sorghum cultivars for sheep

“…The volume of gases produced depends on the chemical composition of the feed, mainly the contents of fibrous fractions and nonfibrous carbohydrates, as well as their total degradability. The mean total volume of gases in the present study was 194.9 mL g -1 DM, which is similar to those of other trials using silages from different sorghum hybrids (Mauricio et al, 2003;Silva et al, 2014). Significant differences were found for the mean dry matter disappearance among the silages evaluated (Table 4).…”

“…Despite the low-protein content, 'IPA 2502' had the lowest proportion of nitrogen associated to the fibrous fractions (NDIN and ADIN), which indicates that this nitrogen is more easily available for microbial metabolism during ruminal degradation. The evaluated fibrous fractions (NDFap, ADFap and Lig) were similar to those reported in the literature (Miron et al, 2007;Oliveira et al, 2009;Silva et al, 2012Silva et al, , 2014Neves et al, 2015). The variation of TDN values among the cultivars may result in impaired animal performance, and may be due to differences between the proportions of the plant parts (leaves, stem and panicle) and the nutritional values of these fractions, which will interfere with the quality of the silage produced (Miron et al, 2007).…”

“…There were no differences between the final gas volume produced from the fermentation of fibrous fractions (FV FC ), but similarly to the nonfibrous carbohydrates, the fermentation rate of fibrous carbohydrates was higher for 'IPA 2502'. Lower rates of gas production from the fibrous fraction are indicative of low degradability (Silva et al, 2014). The 'IPA 2502' genotype also had the lowest-lignin content.…”

Ruminal kinetics and nutritive value of Zuri grass silage harvested at different ages and added with powder molasses

“…According to Vans Soest (1994), non-brous carbohydrates are available for microbial degradation and have a rapid rate of fermentation, while brous carbohydrates need to be colonized by microorganisms to be degraded, making fermentation slow. Silva et al (2014), and Rodrigues et al (2012) reported the behavior similar to the present experiment, where higher rates of degradation of non-brous fractions were observed in relation to brous ones.…”

“…Much of the volume of gases produced comes from slowly degrading compounds (Silva et al, 2014), and an increase in gas volumes on silages with higher digestibility in brous fractions, explaining the greater ber degradability. Therefore, fermentable or digestible forages showed high gas production rates, resulting in greater fermentation of the material in a shorter incubation time (Guimarães Jr. et al, 2008).…”