EFFECT OF MUZZLING ON RUMINATION IN SHEEP

1988 ◽  
Vol 68 (2) ◽  
pp. 387-397 ◽  
Author(s):  
K. CHAI ◽  
L. P. MILLIGAN ◽  
G. W. MATHISON
Keyword(s):  
Key Words ◽  
Surface Area ◽  
Retention Time ◽  
Intestinal Tract ◽  
Rumen Fluid ◽  
Fluid Retention ◽  
Input Output ◽  
Reed Canarygrass ◽  
Large Particles ◽  
Microbial Attack

Two experiments were completed using four esophageal-fistulated sheep (two per experiment) to study the breakdown of rumen particles of grass hay (bromegrass or reed canarygrass) when rumination was either allowed to occur normally or was restricted by means of a muzzle. When the sheep were muzzled during the nonfeeding portion of the day, there was a distinct limitation of voluntary hay intake. Muzzled sheep chewed more often than unmuzzled sheep (P < 0.01) during eating and, presumably as a result, the particles in their mastication boluses were smaller (P < 0.05). During rumination the regurgitated and chewed boluses from sheep that had been muzzled were larger (P < 0.05) than those from unmuzzled sheep. The proportion of large particles (LP, particles retained on a 1.00-mm screen) of the regurgitated bolus, rumen contents and feces were greater (P > 0.05) for muzzled than unmuzzled sheep. The effectiveness of breakdown of LP retained for chewing during the rumination cycle increased (P < 0.005) with time after feeding (33% at 3 h postfeeding for bromegrass; 57% at 11 h postfeeding). This increase was eliminated by muzzling. The specific fragility (LP breakdown per chew per unit of LP in mouth) of particles from unmuzzled sheep was consistently greater (P > 0.05) than that of particles from muzzled animals. Muzzling markedly reduced the extent to which specific fragility increased with time after feeding and increased (P > 0.01) rumen fluid retention time from 7.4 to 17.4 h. The rumen input-output balance for hay particles was estimated. It is concluded that rumination is the major factor in decreasing the size of forage particles in the rumen, thereby exposing greater surface area to microbial attack and facilitating passage along the intestinal tract. Key words: Sheep, rumination, muzzle, particle breakdown, specific fragility, rumen retention time

INTRAVENOUS SOMATOSTATIN INFUSION AFFECTS GASTRO-INTESTINAL TRACT FUNCTION IN SHEEP

1984 ◽  
Vol 64 (5) ◽  
pp. 93-94 ◽  
Author(s):  
G. J. FAICHNEY ◽  
T. N. BARRY
Keyword(s):  
Small Intestine ◽  
Key Words ◽  
Large Intestine ◽  
Retention Time ◽  
Intestinal Tract ◽  
Proximal Colon ◽  
Mean Retention Time ◽  
Gut Function ◽  
Tract Function ◽  
Gastro Intestinal Tract

Intravenous somatostatin infusion to anestrous ewes decreased the weight of all postomasal gut tissues, produced small increases in total 51Cr-EDTA and, 103Ru-phen mean retention times, increased the proportion of the total mean retention time spent in the abomasum + small intestine + cecum/proximal colon and decreased the proportion spent in the distal large intestine. Key words: Somatostatin, gut function, marker retention times

EFFECTS OF COLD EXPOSURE AND PLANT SPECIES ON FORAGE INTAKE, CHEWING BEHAVIOR AND DIGESTA PARTICLE SIZE IN SHEEP

1985 ◽  
Vol 65 (1) ◽  
pp. 69-76 ◽  
Author(s):  
K. CHAI ◽  
L. P. MILLIGAN ◽  
P. M. KENNEDY ◽  
G. W. MATHISON
Keyword(s):  
Particle Size ◽  
Fluid Flow ◽  
Cold Stress ◽  
Rumen Fluid ◽  
Red Clover ◽  
Fluid Retention ◽  
Feed Consumption ◽  
Reed Canarygrass ◽  
Forage Intake ◽  
Voluntary Intake

Three closely shorn sheep were allotted to each of three diets of chopped hay prepared from red clover, reed canarygrass and bromegrass, respectively. The animals were housed at 25, 10 and −5 °C during three periods of 28 days. For the final 8 days of each period, each individual sheep was restricted to 90% of its voluntary feed consumption and hay was given at intervals of 2 h. Eating and chewing behavior, rumen fluid kinetics and digesta particle size were determined. Voluntary intake of clover hay was greater, but chews during eating and rumination were less than for sheep consuming grass hay. The small particle fractions present in the duodenum and rumination activity were greater in the sheep fed grasses. Feed intake, rumination chews and duration, and digesta particle size in the duodenum were increased in sheep housed at −5 °C. Eating duration and chews, particle size of rumen digesta and rumen fluid volume were not affected by cold stress, but fluid retention time was reduced, while daily fluid flow from the rumen tended to increase. Key words: Forage intake, cold stress, chewing behavior, digesta particle size, fluid passage

scholarly journals DAY-TO-DAY VARIATIONS IN FAT PERCENT OF COW'S MILK

1990 ◽  
Vol 70 (2) ◽  
pp. 731-734 ◽  
Author(s):  
A. S. ATWAL ◽  
J. D. ERFLE
Keyword(s):  
Dairy Cows ◽  
Key Words ◽  
Milk Yield ◽  
Milk Fat ◽  
Rumen Fluid ◽  
Supplemental Feeding ◽  
Fat Percentage ◽  
Milk Fat Depression ◽  
Daily Milk Yield ◽  
Daily Milk

Large day-to-day variations in milk fat, particularly for the morning milkings, were observed in 36 Holstein cows. Changes in percent fat were gradual and produced wavelike patterns in a number of instances. Supplemental feeding of long hay had no effect on acetate/propionate ratio in rumen fluid, daily milk yield or weighted milk fat percentage. Key words: Dairy cows, milk, fat depression, hay

scholarly journals Pengaruh Indeks Sinkronisasi dalam Rumen pada Ransum Berbasis Bagase terhadap Produksi VFA Rumen pada Domba

2018 ◽  
Vol 1 (2) ◽  
Author(s):  
Novi Eka Wati
Keyword(s):  
Key Words ◽  
Sugarcane Bagasse ◽  
Rumen Fluid ◽  
Feeding Period ◽  
Trial Period ◽  
Fluid Sample ◽  
Feeding Trial ◽  
Experimental Diet ◽  
Synchronization Index

The aim of the research was to study the effects of synchronization index in the sugarcane bagasse based ration on acetate, propionate and butirate production of sheep. Two permanent cannulated male local sheep was 2 years old for sampling rumens fluids. They were feed a complete feed based on bagasse with a level of synchrony index 0,37; 0,50; 0,63 were design isoprotein and isoenergy. Each experimental diet was offered to each sheep three times randomly for 7 days, with 7 days interval between feeding period of each experimental diet. About 10 ml of rumen fluid sample were collected before feeding and 3 hour after feeding at the 7th day of each feeding trial period. The alteration of synchronization indexs did not affect acetate, propionate, butirate and ratio acetate/propionate (C2/C3) in rumen before feeding and 3 hour after feeding. Key words : acetate, butirat, propionate, synchrony index

COMPARISON OF COPPER SULFATE AND COPPER PROTEINATE AS COPPER SOURCES FOR COPPER-DEPLETED STEERS FED HIGH MOLYBDENUM DIETS

1990 ◽  
Vol 70 (3) ◽  
pp. 895-904 ◽  
Author(s):  
K. M. WITTENBERG ◽  
R. J. BOILA ◽  
M. A. SHARIFF
Keyword(s):  
Key Words ◽  
Dietary Supplement ◽  
Copper Sulfate ◽  
Rumen Fluid ◽  
High Ratio ◽  
Corn Silage ◽  
Copper Supplementation

Copper (Cu) depleted steers were used to compare copper sulfate and copper proteinate as Cu sources for cattle consuming high molybdenum diets. Two experiments utilizing corn silage and barley concentrate diets with 10 mg added Mo kg−1 DM were undertaken. Experiment A was a 105-d study in which an 83:17 ratio of silage to concentrate was fed, whereas, experiment B was an 84-d study comparing the same Cu treatments for cattle fed a 26:74 (Low) or a 64:36 (High) ratio of silage to concentrate. Cu treatments for both experiments were: no supplemental Cu (0Cu); a dietary supplement of 10 mg Cu kg−1 DM added as copper sulfate (CuSO); and a dietary supplement of 10 mg Cu kg−1 DM added as copper proteinate (CuPro). Both Cu supplements improved (P < 0.05) concentrations of Cu in plasma for both experiments and improved (P < 0.05) concentration of Cu in liver for experiment B. Copper supplementation (P < 0.05) reduced plasma Mo concentrations in experiment A relative to animals receiving no supplemental Cu. Both Cu sources resulted in reduced rumen fluid soluble Mo concentrations. Steers in experiment A had lower initial liver and plasma Cu concentrations than was observed for experiment B. Average daily gains for steers consuming CuPro were 16.8% greater (P < 0.05) than for 0Cu with CuSO being intermediate for experiment A. Results indicate that the bioavailability of Cu from Cu proteinate is similar to that of copper sulfate in-Cu depleted steers consuming diets containing excess Mo. Key words: Cattle, copper sulfate, copper proteinate, copper, molybdenum

DUODENAL FLOW AND SOLUBLE PROPORTIONS OF ZINC, MANGANESE, COPPER AND IRON IN THE RUMEN FLUID AND DUODENAL DIGESTA OF FAUNATED AND DEFAUNATED SHEEP

1982 ◽  
Vol 62 (3) ◽  
pp. 979-982 ◽  
Author(s):  
M. IVAN ◽  
D. M. VEIRA
Keyword(s):  
Trace Elements ◽  
Small Intestine ◽  
Trace Metal ◽  
Key Words ◽  
Rumen Fluid ◽  
Critical Role ◽  
Metal Metabolism ◽  
Ciliate Protozoa ◽  
Manganese Copper

Measurements of soluble proportions in the rumen fluid and duodenal digesta and flow into the small intestine of zinc, manganese, copper and iron were carried out in defaunated and faunated sheep. There was no significant (P > 0.05) effect of the defaunation on any measurements. It was concluded that ciliate protozoa do not have a critical role in trace metal metabolism in the rumen of sheep. Key words: Defaunation, sheep, trace elements, solubility

Microstructure Characteristics of YBa2Cu3O7-y Nanocomposite by Shortening the Manufacturing Process

2020 ◽  
Vol 20 (11) ◽  
pp. 6703-6705
Author(s):  
Sang Heon Lee
Keyword(s):  
Surface Area ◽  
Material Properties ◽  
Manufacturing Process ◽  
Boundary Surface ◽  
Important Goal ◽  
Ybco Bulk ◽  
Microstructure Characteristics ◽  
Large Particles

In this study, YBCO bulk was produced using two seeds by placing an additional seed on the upper pellet of the sample fabricated with the ISMG process. It was confirmed that the upper and lower pellets consisting of a–b sector showed a higher number of Y211 particles than those consisting of a–c sector, and that the same tendency appeared at a spot where different interfaces existed. This can be most clearly compared at the center. Finally, it was found that although minimizing the growth of a–c sector is an important goal for fabricating superconducting bulk magnets with high material properties, it is necessary to minimize the size of areas where different interfaces appear. It can be seen that the number of Y211 particles is the smallest inside the boundary surface, and that although they occupied a relatively smaller surface area, large particles agglomerated together.

Studies of cattle and sheep eating leaf and stem fractions of grasses. 3. The retention time in the rumen of large feed particles

1981 ◽  
Vol 32 (1) ◽  
pp. 123 ◽  
Author(s):  
DP Poppi ◽  
DJ Minson ◽  
JH Ternouth
Keyword(s):  
Particle Size ◽  
Retention Time ◽  
Dry Matter ◽  
Simulation Studies ◽  
Small Particles ◽  
Dry Matter Distribution ◽  
Rhodes Grass ◽  
Large Particles ◽  
Voluntary Intake ◽  
Cattle And Sheep

Pangola grass (Digitavia decumbens) and Rhodes grass (Chlovis gayana) cut as 6 and 12 week regrowths were separated into leaf and stem fractions and fed ad libitum to four cattle and eight sheep fitted with ruminal fistulae to determine the importance of particle size in controlling the retention time of feed in the rumeno-reticulum (rumen). Particle size was determined by using a wet sieving technique, and based on the cumulative dry matter distribution on the sieves of faeces from cattle and sheep; all particles >1.18 mm were described as large particles. The proportion of large particles was measured in the chopped diet offered, the masticated diet, the ruminal contents and the faeces. Chopped leaf and stem fractions contained 0.85 and 0.86 g/g large particles respectively. Mastication by cattle reduced the proportion of large particles in leaf and stem to 0.58 and 0.76 (P < 0.01), and mastication by sheep to 0.56 and 0.67 (P < 0.01). The proportion of large particles in the rumen of sheep was 0.236 and 0.249 for leaf and stem respectively (P > 0.05) and in cattle 0.272 and 0.345 (P < 0.05). The faeces contained relatively few large feed particles (< 0.045 for cattle and <0.018 for sheep). Cattle eating leaf and stem produced faeces containing 0.027 and 0.040 (g/g) large particles (P <0.05), compared with only 0,008 and 0.013 (P < 0.05) in sheep. Most of the large particles entering the rumen in the masticated feed disappeared in the rumen by breakdown to smaller particles or by digestion. In cattle the proportions that disappeared were 0.978 and 0.976 (P > 0.05) for leaf and stem, and in sheep 0.993 and 0.991 (P > 0.05). Large particles in leaf and stem were retained in the rumen of the sheep for 11.0 and 11.7 h (P > 0.05). Cattle retained large particles in all diets for a longer time (P < 0.01); 16.1 h for leaf and 20,2 h for stem (P > 0.05). Differences in retention time of large particles in the rumen did not appear to be the only factor controlling the retention of dry matter in the rumen and voluntary intake. A model was developed to describe the flow of large and small particles through the rumen. Intake simulation studies indicated that the most important factor influencing dry matter retention time in the rumen was the retention time of small particles (> 1.18 mm). Changes in the rate of breakdown of large particles had a small effect on dry matter retention time.

scholarly journals EFFECT OF DIETARY CONCENTRATE LEVEL ON RUMEN FLUID DILUTION RATE

1982 ◽  
Vol 62 (2) ◽  
pp. 649-652 ◽  
Author(s):  
A. L. GOETSCH ◽  
M. L. GALYKAN
Keyword(s):  
Key Words ◽  
Dilution Rate ◽  
Energy Intake ◽  
Flow Rate ◽  
Liquid Flow ◽  
Liquid Flow Rate ◽  
Rumen Fluid ◽  
Turnover Time ◽  
Rumen Ph ◽  
Concentrate Level

Rumen fermentation, and rumen fluid dilution rate as influenced by 75% (75C) or 25% (25C) concentrate diets fed at the same level of energy intake was studied with four steers. Rumen pH was lower (P < 0.05) in steers fed 75C. Liquid flow rate and liquid turnover time were increased (P < 0.05) by feeding 25C. Key words: Liquid dilution rate, fermentation, concentrate level

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