Effects of 2-hydroxy-4(methylthio) butanoic acid isopropyl ester on rumen fermentation in cashmere goats

Abstract

-The impact of dietary 2-hydroxy-4-(methylthio) butyric acid isopropyl ester (HMBi) on rumen fermentation in cashmere goats was investigated to determine the effect of this ester on cashmere production. Four healthy castrated Liaoning cashmere goats with permanent rumen cannulas were assayed for four periods. In each period, goats were fed a different diet: control diet (containing 0% MetaSmart (an HMBi product)), diet I (containing 0.85% MetaSmart), diet II (containing 1.27% MetaSmart) or diet III (containing 1.70% MetaSmart). Rumen pH, ammonia-N concentration, volatile fatty acid (VFA) concentrations and total protein concentration were determined after feeding in each period. Results showed that rumen pH significantly increased and rumen ammonia-N concentration significantly decreased when the diet was supplemented with 0.85%, 1.27% and 1.70% MetaSmart. Diets with 1.27% and 1.70% MetaSmart increased rumen total VFA concentration, and 3 hours post feeding all three HMBi diets increased acetic acid concentration. Rumen total protein concentration significantly increased in the goats fed 1.27% or 1.70% MetaSmart. Thus, diets supplemented with HMBi significantly affected rumen pH, ammonia-N concentration, VFA concentrations and total protein content. Dietary HMBi can promote rumen fermentation in cashmere goats.Key Words: 2-hydroxy-4-(methylthio) butyric acid isopropyl ester, rumen ammonia-N, rumen pH, rumen total protein, rumen volatile fatty acids

Effect of fat supplementation and stage of lactation on methane production in dairy cows

“…However, there was a tendency (P = 0.07) for supplementation of HMBi to decrease production of CH 4 /kg DMI compared to RPF. This reduction was not expected, since HMBi increases the total concentration of VFA and acetic acids: propionic acid ratio in the rumen of goats (Feng et al, 2013); thus, CH 4 production would be expected to be higher. Intake of DM for RPFA was numerically slightly higher than for RPF and DMI could therefore have affected CH 4 production as discussed above; however, the magnitude of the difference in DMI was not large enough to explain the lower CH 4 emission for RPFA compared to RPF found in the current experiment.…”

Evaluación De La Densidad Y Uso Integral De Tres Árboles Leguminosos en Los Sistemas Silvopastoriles en El Trópico De Guerrero, México.

“…The fraction of ashes due to the contribution of minerals and the fraction of NDF by the contribution of energy to the activity of microbial flora in the rumen (Hamed & Elimam, 2009;Kumara et al, 2009;Olivares-Pérez et al, 2013). Furthermore, it has been observed that a mineral deficiency in ruminant diet can cause a decrease in the rumen microbial growth and affect the fermentative activity of bacteria on the fibre (Feng et al, 2013). Also in ruminants decreased dry matter intake and the digestibility of diets deficient in phosphorus (Feng et al, 2013).…”

“…Furthermore, it has been observed that a mineral deficiency in ruminant diet can cause a decrease in the rumen microbial growth and affect the fermentative activity of bacteria on the fibre (Feng et al, 2013). Also in ruminants decreased dry matter intake and the digestibility of diets deficient in phosphorus (Feng et al, 2013).…”

“…The effects of treatment, time and interaction treatment by time on ruminal pH values kids observed, indicate that foliage of trees of P. dulce Roxb Benth, G. sepium Jacq Steud and H. brasiletto Karst can include up to 30% of the diet without problems or digestive imbalances. This is because the ruminal pH is an indicator of the balance of the ruminal flora, fermentative processes and end products of digestion of food (Abarghuei et al, 2011;Feng et al, 2013;Ondiek et al, 2013;Paengkoum, 2010;Pérez-Sato et al, 2011;Supreena & Peangkoum, 2011).…”