<b>Fermentation kinetics and <i>in vitro</i> degradation rates of grasses of the genus <i>Cynodon</i>

Abstract

The present study aimed to evaluate the fermentation kinetics and degradation rates of Cynodon grasses estimated by semi-automated technique of in vitro gas production. The forages were: Coastcross, Tifton 85 and Tifton 68. Pressure readings were taken at 0, 2, 4, 6, 8, 10, 12, 15, 19, 24, 30, 36, 48, 72 and 96 hours. Dry matter degradability (DMD) was obtained by the percentage of dry matter (DM) remaining after 0, 6, 12, 24, 48 and 96 hours of fermentation. Tifton 85 showed a higher total gas production (p &lt;0.05). Higher fermentation rates were found at the beginning of fermentation followed by subsequent reduction (p &lt;0.05) over time. Tifton 85 and Tifton 68 showed higher values (p &lt; 0.05) for soluble fraction, potentially degradable insoluble fraction, insoluble fraction, potential and effective degradability of dry matter in relation to Coastcross grass. Higher gas production during in vitro incubation of dry matter was observed for Tifton 85 g.

Impact of distinct levels swimming crab shell powder (Portunus pelagicus) supplementation on in vitro rumen fermentation properties processed with phosphoric acid as a chitosan source

“…Supplementation SCS treatments substantially affected total gas production 1-48 hours and c: rate of gas production at t (P<0.05), but time gas production from total fraction (a+b), soluble fraction (a), and insoluble fraction (b) was not significantly affected by treatments. The kinetics of gas production appear to be determined by two separate phases, the first of which is suited for the degradation of the soluble portion of the studied mixes, and the second of which is not (b) represented by cell wall components, represented by the cell wall composition, rumen degradation is slowed, this is due to the arrangements of these components with lignin and second insoluble but potentially fermentable fraction (a) represented by soluble carbohydrates from the rapid degradation that occurs in the rumen (rumen degradation) [30]. Significant result in c: rate of gas production at time means the supplementation of SCS influence in higher rate production of soluble fraction.…”