Serra, A.B.;Nakamura, K.;Matsui, T.;Harumoto, T.;Fujihara, T.
Asian-Australasian Journal of Animal Sciences
/
v.7
no.1
/
pp.83-89
/
1994
The effects of inorganic selenium (Se), selenate and selenite on Se balance levels in the different ruminal fluid fractions were studied using Japanese Corriedale wethers with an average body weight of 47 kg. A $3{\times}3$ Latin square design was used with three animal, three periods and three treatments. In each period, there was 7 d dietary adjustment followed by 5 d total collection of urine and feces. Ruminal fluid samples were obtained at 0, 1, 3, 5 and 7 h postprandially on the final day of the collection period. The three dietary treatments were: (1) without Se supplementation (control); (2) with Se supplement as sodium selenate; and (3) sodium selenite at a rate of 0.2 mg Se/kg dietary DM. The basal diet was timothy hay (Phleum pratense L.) fed 2% of body weight/d. Results indicated that Se balance were higher (p < 0.05) for those animals under supplementation than those animals under control. Overall data gathered showed a similar digestion balance of selenate and selenite in sheep. Inorganic Se, both selenate and selenite produced positive Se contents of the ruminal feed particles and protozoa. Bacterial Se increased (p < 0.05) on the first three hours post-prandially in Se supplemented diets. Gross ruminal fluid fraction, although there was improvement on their Se content under the supplemented diets, the changes were insignificant over the control. free inorganic Se and Se in soluble protein of the ruminal fluid were not significantly different for selenate and selenite. Most of the Se in the ruminal fluids of the animals under supplementation were insoluble, indicating the influence of rumen environments on Se bioavaliability.
The effects of diets differing in protein content through soybean meal supplementation on ruminal fractionation of selenium (Se) were studied. A $3{\times}3$ Latin square design was used with three Japanese Corriedale wethers (45 kg average body weight), three periods, and three dietary treatment. The three dietary treatments were : Diet 1, without soybean meal supplementation (14% crude protein, CP); Diet 2, with 10% soybean meal supplementation (16.5% CP); and Diet 3, with 20% soybean meal supplementation (19% CP). All the diets had a Se supplementation in the form of sodium selenite at 0.2 mg Se/kg dietary DM. The Se supplement and the concentrate mixture were fed only in the morning before the hay was given. Daily feeding schedule for gay was set at 09:00 and 17:00 h. On the final day of collection period, ruminal fluid samples were obtained at 0.5, 2, 6, 12 and 24 h post-feeding starting at 09:00 h. Total ruminal fluid Se was markedly higher (p<0.05) in Diet 3 than those in Diets 1 and 2 at almost all sampling time except at 24 h. The proportion of Se in soluble protein to the total ruminal Se was higher (p< 0.05) in Diet 3 (40%) followed by Diet 2 (28%) and Diet 1 (21%). The proportion of free inorganic Se to the total ruminal Se was the reverse, especially after two hours where Diet 1 (p<0.05) was higher than the other diets. Bacterial Se was lower (p < 0.05) in Diet 1 than those in Diets 2 and 3 at any sampling time. The highest was observed at 2 h postprandially in all diets with a value of 421, 556, $655{\mu}g/kg$ bacterial DM for Diet 1, 2 and 3, respectively. No differences (p>0.05) were observed on ruminal pH, ammonia and total nolatile fatty acids although increasing protein supplementation tended to decline the ruminal pH and increase ruminal ammonia. This study concludes that increasing dietary protein content by soybean meal supplementation can affect the ruminal Se metabolism.
Serra, A.B.;Nakamura, K.;Matsui, T.;Harumoto, T.;Fujihara, T.
Asian-Australasian Journal of Animal Sciences
/
v.7
no.1
/
pp.91-96
/
1994
This study was conducted to determine the effect of inorganic selenium (Se) sources on rumen bacterial yield, ruminal volatile fatty acid (VFA) production and total tract digestion of timothy hay (Phlewm pratense L.) in Japanese Corriedale wethers. A $3{\times}3$ Latin square design was used with three wethers, three periods and three treatments. In each period, there was 7 d dietary adjustment followed by 5 d total collection of urine and feces. Ruminal fluid samples were obtained at 0, 1, 3, 5 and 7 h postprandially on the final day of the collection period. The three dietary treatments were: (1) without Se supplementation (control); (2) with Se supplementation as sodium selenate; and (3) sodium selenite at a rate 0.2 mg Se/kg dietary DM. The basal diet was timothy hay fed at 2% of body weight/d. Results indicated that there was slight decrease in rumen bacterial yield of animal supplement with inorganic Se, however, differences over the control were insignificant. It was found that Se content of ruminal fluid was negatively correlated (p < 0.05) to rumen bacterial yield. The various VFA contents and acetate and propionate ratio of the different ruminal fluid samples were insignificant across treatment means and the same manner was observed to the different digestibilities (DM, OM, CP, NDF, ADF and NDS). This study concludes that Se supplementation at 0.2 mg Se/kg dietary DM either from sodium selenate or sodium selenite could not significantly influence rumen bacterial functions.
Effects of oral administration of electrolyte solutions were studied in experimentally dehydrated adult sheep. By the latin square method five ruminal fistulated sheep were examined and dehydrated by deprivation of feed and water for 72 hours. Tap water, physiological saline, 0.45% NaCl+120 mM/L glucose and 0.9% NaCl+1% propylene glycol solution were orally administrated after dehydration, respectively. Rehydration effect and modification of the rumen function were compared. 1. After 72 hours of deprivation of feed and water, sheep were hypertonic dehydrated and blood acid-base parameters were not significantly changed. And there was marked increase in ruminal pH and decrease in ruminal total volatile fatty acid(VFA) concentration. 2. After the fluids administration the changes in blood acid-base parameters were not significant in all groups. 3. Although glucose fermentation in the rumen was observed, 0.45% NaCl+120 mM/L glucose was more effective in rehydration than physiological saline and tap water. But it was difficult to know the rehydration effect of 0.9% NaCl+1% propylene glycol solution exactly because of excessive increase in plasma osmolality. 4. After refeeding, total concentration and proportions of ruminal volatile fatty acid(VFA) were not significantly different among groups and recovered to normal concentration but not in proportions after 2 days in all groups. 5. In vitro cultured ruminal protozoa were susceptible to the decrease of the pH and osmolality.
Eight Holstein steers ($216{\pm}48kg$ body weight) fitted with ruminal and duodenal cannulas were used to evaluate effects of wheat straw processing (ground vs pelleted) at two straw inclusion rates (7% and 14%; dry matter basis) in dry rolled or steam-flaked corn-based finishing diets on characteristics of digestion. The experimental design was a split plot consisting of two simultaneous $4{\times}4$ Latin squares. Increasing straw level reduced ruminal (p<0.01) and total tract (p = 0.03) organic matter (OM) digestion. As expected, increasing wheat straw level from 7% to 14% decreased (p<0.05) ruminal and total tract digestion of OM. Digestion of neutral detergent fiber (NDF) and starch, per se, were not affected (p>0.10) by wheat straw level. Likewise, straw level did not influence ruminal acetate and propionate molar proportions or estimated methane production (p>0.10). Pelleting straw did not affect ($p{\geq}0.48$) ruminal digestion of OM, NDF, and starch, or microbial efficiency. Ruminal feed N digestion was greater (7.4%; p = 0.02) for ground than for pelleted wheat straw diets. Although ruminal starch digestion was not affected by straw processing, post-ruminal (p<0.01), and total-tract starch (p = 0.05) digestion were greater for ground than for pelleted wheat straw diets, resulting in a tendency for increased post-ruminal (p = 0.06) and total tract (p = 0.07) OM digestion. Pelleting wheat straw decreased (p<0.01) ruminal pH, although ruminal volatile fatty acids (VFA) concentration and estimated methane were not affected ($p{\geq}0.27$). Ruminal digestion of OM and starch, and post-ruminal and total tract digestion of OM, starch and N were greater (p<0.01) for steam-flaked than for dry rolled corn-based diets. Ruminal NDF digestion was greater (p = 0.02) for dry rolled than for steam-flaked corn, although total tract NDF digestion was unaffected (p = 0.94). Ruminal microbial efficiency and ruminal degradation of feed N were not affected (p>0.14) by corn processing. However, microbial N flow to the small intestine and ruminal N efficiency (non-ammonia N flow to the small intestine/N intake) were greater (p<0.01) for steam-flaked than for dry rolled corn-based diets. Ruminal pH and total VFA concentration were not affected ($p{\geq}0.16$) by corn processing method. Compared with dry rolled corn, steam-flaked corn-based diets resulted in decreased acetate:propionate molar ratio (p = 0.02). It is concluded that at 7% or 14% straw inclusion rate, changes in physical characteristics of wheat straw brought about by pelleting negatively impact OM digestion of both steam-flaked and dry-rolled corn-based finishing diets. This effect is due to decreased post-ruminal starch digestion. Replacement of ground straw with pelleted straw also may decrease ruminal pH.
Kim, Chang-H.;Kim, Jong N.;Ha, Jong K.;Yun, Sang G.;Lee, Sung S.
Asian-Australasian Journal of Animal Sciences
/
v.17
no.3
/
pp.337-342
/
2004
A non-ionic surfactant, Tween 80 has been known to exert a number of positive effects on degradative enzymes in in vitro aerobic and anaerobic microbial cultures. An experiment was conducted to examine effects of supplementation of Tween 80 on ruminal fermentation and nutrient digestibility of Hanwoo steers. The experiment was designed as a $3{\times}3$ Latin square with duplication and six Hanwoo steers with rumen cannulae, average weight 497 (SE 61.1) kg. For the experiment the animals were given a basal diet consisting of rice straw and compound feed mixed at 4:6 ratio. The three experimental treatments were (1) the basal diet, supplemented with (2) 5 g/d Tween 80 and (3) 10 g/d Tween 80. Ruminal pH was significantly (p<0.05) affected by Tween 80 supplementation at 6 h after feeding. Increasing supplementation levels of Tween 80 linearly increased the total VFA concentration. CMCase activity by the 10g/d supplementation of Tween 80 were significantly increased (p<0.05) by 24.4% compared with that of control. Digestibility of crude fiber was significantly increased (p<0.05) in Hanwoo steers fed the diet supplemented with 10 g/d Tween 80 compared with those of control, whilst digestibility of ether extract (EE) was linearly increased by increasing Tween 80 supplementation level (p<0.05). In other nutrient components, their digestibilities of Hanwoo fed diets supplemented with Tween 80 tended to increase. It is concluded that Tween 80 has a potential for industrial application as a feed additive to improve ruminant production.
Ki, Kwang Seok;Park, Su Bum;Lim, Dong Hyun;Park, Seong Min;Kim, Sang Bum;Kwon, Eung Gi;Lee, Se Young;Choi, Ki Chon
Journal of The Korean Society of Grassland and Forage Science
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v.33
no.4
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pp.240-244
/
2013
We investigated the nutritive value and ruminal in situ dry matter degradability of whole crop rice silage prepared using Chucheongbyeo (WCRS) as a roughage source for ruminants. The crude protein (7.54%), acid detergent fiber (29.63%), neutral detergent fiber (62.98%), and total digestible nutrient (TDN) (57.88%) found higher in WCRS than those of rice straw. Manganese content in the WCRS was the highest, followed by carbon, iron, zinc, and copper, but magnesium content was the lowest. Glutamic acid content in WCRS was the highest, followed by leucine, asparagine, alanine, valine, arginine, and methionine content was the lowest. We examined ruminal in situ digestibility from total whole crop rice (TWCR), rice husks containing rice (RHR), whole crop rice except RHR (WER), and husked grain (HG) for 3, 6, 12, 24, and 48 hours. Ruminal in situ digestibility in the HG was the highest, followed by RHR, TWCR, and WER. Therefore, we suggest that ruminal in situ degradability was influenced by parts of whole crop rice, and the content of manganese and glutamic acid were the highest in WCRS.
Objective: The present study was conducted to examine the gas production, fermentation characteristics, nutrient degradation, and methanogenic community composition of a rumen fluid culture with Broussonetia papyrifera (B. papyrifera) subjected to ensiling or steam explosion (SE) pretreatment. Methods: Fresh B. papyrifera was collected and pretreated by ensiling or SE, which was then fermented with ruminal fluids as ensiled B. papyrifera group, steam-exploded B. papyrifera group, and untreated B. papyrifera group. The gas and methane production, fermentation characteristics, nutrient degradation, and methanogenic community were determined during the fermentation. Results: Cumulative methane production was significantly improved with SE pretreatment compared with ensiled or untreated biomass accompanied with more volatile fatty acids production. After 72 h incubation, SE and ensiling pretreatments decreased the acid detergent fiber contents by 39.4% and 22.9%, and neutral detergent fiber contents by 10.6% and 47.2%, respectively. Changes of methanogenic diversity and abundance of methanogenic archaea corresponded to the variations in fermentation pattern and methane production. Conclusion: Compared with ensiling pretreatment, SE can be a promising technique for the efficient utilization of B. papyrifera, which would contribute to sustainable livestock production systems.
Two experiments were conducted to examine the effects of a range of concentrations of ruminal fluid ammonia ($NH_3$-N) on forage digestibility, microbial growth efficiency and the mix of microbial species. Urea was either continuously infused directly into the rumen of sheep fed 33.3 glh of oaten chaff (Exp. I) or sprayed onto the oaten chaff (750 g/d) given once daily (Exp. 2). Concentrations of $NH_3$-N increased with incremental addition of urea (p < 0.01). Volatile fatty acids (VFA) concentrations and 24 h in sacco organic matter digestibility in the rumen were higher when supplemental urea was given (p < 0.01). The (C2 + C4) : C3 VFA ratio was lower (p < 0.05) when $NH_3$-N was above 200 mgN/I. The fungal sporangia appearing on oat leaf blades were significantly higher when urea was supplemented, indicating that $NH_3$-N was a growthlimiting nutrient for fungi at levels of $NH_3$-N below 30 mgN/l. The density of protozoa was highest when $NH_3$-N concentrations were adjusted to 30 mgN/I for continuously fed ($4.4{\times}10^5/ml$) and to 168 mgN/1 for once daily feeding ($2.9{\times}10^5/ml$). Thereafter increasing concentrations of $NH_3$-N, were associated with a concomitant decline in protozoal densities. At the concentration of $NH_3$-N above 200 mgN/l, the density of protozoa was similar to the density of protozoa in ruminal fluid of the control sheep ($1.8{\times}10^5/ml$). The efficiency of net microbial protein synthesis in the rumen calculated from purine excretion was 17-47% higher when the level of $NH_3$-N was above 200 mgN/1. The possibilities are that 1) there is less bacterial cell lysis in the rumen because of the concomitant decrease in the protozoal pool and/or 2) microbial growth per se in the rumen is more efficient with increasing $NH_3$-N concentrations.
The researchers have tried to reduce ruminal methane gas ($CH_4$) and to convert it into beneficial nutrient for several decades. This study was conducted to screen the methane-reducing vegetables among lettuce, hot pepper, spring onion, onion, turmeric, sesame leaf, garlic, radish sprout, leek and ginger nutritiously on the in vitro ruminal fermentation. The heat-treated vegetables at the 10% of substrate (timothy) were used to reduce methane production on the in vitro anaerobic experiment of 0, 6, 12, 24 and 48 h incubation time. Total gas production, pH, ammonia, $H_2$, $CO_2$, $CH_4$, and volatile fatty acid (VFA) were measured as indicators of in vitro fermentation product containing methane gas. All treatments except garlic showed a tendency to increase in total gas production. The result of ammonia showed that garlic and hot pepper affected rumen bacteria concerned protein metabolism and that lettuce and spring onion increased ammonia production. Garlic decreased $CH_4$ production in inverse proportion to $H_2$. Lettuce, spring onion, onion, garlic, radish sprout, leek and ginger increased propionate of VFA. Garlic balanced the ruminal fermentation in the pH, $H_2$, $CH_4$, acetate and propionate. This results showed that methane production at in vitro study was inhibited by heat-treated garlic supplementation. In conclusion, this study suggests that ruminal fermentation covering methane production might be controled by proper vegetables.
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