Influence of supplemental aminooligosaccharides on <i>in vitro</i> disappearance of diets for dairy cattle and its effects on milk yield

Abstract

Two experiments were conducted to evaluate the influence of supplemental aminooligosaccharides (AOS) on the disappearance and fermentation of diets for lactating cows, and its effects on milk yield and quality. In the first study, diets containing 0 or 0.2% AOS (dry matter basis) were incubated for 24, 48 and 72 h with ruminal fluid to evaluate the in vitro dry matter disappearance (IVDMD) and fermentation characteristics. The addition of AOS improved IVDMD of diets, induced higher total bacterial and cellulolytic bacterial counts and decreased the number of bacteria that produce lactate compared to the control. At 24 h incubation, AOS increased volatile fatty acid concentrations and the molar proportion of propionate, though at 48 and 72 h incubation AOS did not affect the fermentation characteristics of the diets. In a further experiment, milk yield and milk quality were evaluated using 50 Holstein dairy cows (193 days in milk). Cows were randomly assigned to the diets tested in the in vitro study. Feed intake was not modified by AOS. Milk yield of cows fed AOS was significantly higher than that of cows not supplemented. Because AOS tended to decrease the percentage of fat in milk, fat and solid-corrected milk content were similar for the two treatments. Percentage and yield of non-fat solids, protein and lactose, and the somatic cell count in milk were not affected by AOS. The milk urea-N concentration of the cows fed AOS was lower than of those not supplemented. Supplementing AOS enhanced the disappearance and fermentation characteristics of the diet. Further studies with cows earlier in lactation are necessary to evaluate the effects of AOS on milk yield and milk components.

Effect of Probiotic or Prebiotic Supplementation on the Productive Performance of Barki Lambs.

“…The results obtained in this study are consistent with the results obtained by Shibata, (1985) and Biggs and Hancock, (1998). However, Sánchez et al (2010) found that the concentrations of NH 3 -N were not modified by supplemented prebiotic. On the other hand, the decrease in NH 3 -N concentration with animal fed ration supplemented with probiotics (DFM) might have been the result of increased incorporation of ammonia into microbial protein.This result supported the results obtained from microbial protein synthesis.…”

“…While, lower values TVF's concentrations obtained from control. These results in agreement with Li et al (2007) and Sánchez et al (2010) who provided evidence that probiotics increase volatile fatty acid (VFA), microbial protein concentrations, and stabilize the rumen pH. Similar results were reported by Al-Dabeeb and Ahmed (2002), Komonna (2007) in sheep and Shahin et al (2005).…”

Effect of probiotics supplementation on productive performance of growing lambs

“…The results obtained in this study are consistent with the results obtained by Biggs and Hancock (1998) and Soliman et al (2016). However, Sánchez et al (2010) reported that the concentrations of NH3-N were not affected by supplement prebiotic. As shown in Table (4) the total volatile fatty acids (VFAs) concentration increased (P<0.05) in all treated groups as compared with control group.…”

“…Concerning the effect of sampling time on VFAs concentration, it is clear that the concentration VFAs of was lower before feeding then increases gradually until reached the peak at 6 hours post feeding. These results are agreement with Sánchez et al (2010) stated that the probiotics increase volatile fatty acid (VFA), microbial protein concentrations, and stabilize the rumen pH. El-Ashry et al (2000) found that TVFA's concentration in the rumen was low before feeding and increased with time after feeding.…”