反すう動物におけるフィードロット鼓脹症の発生と第一胃内性状との関係に関する研究

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Bloat In ruminants, especially in cattle is a common disease which is well known since olden times The percentage of contraction to bloat is estimated to be about l%. However, there are many factors to be investigated as to occurrence of frothy bloat. This study was performed to contribute to reduction of feedlot bloat cases. The relationships between dietary factors which accelerate feedlot bloat and ruminal characteristics were investigated. Furthermore, nutritional and physiological studies were performed using chemicals which is expected to have bloat-controlling effect, from its efficacy on ruminal characteristics I. Ruminal characteristics under bloating condition l. Factors affecting the viscosity of rumen fluid in ruminants fed high concentrate diets Viscosity and pH values of rumen fluid in fattening cattle fed Higher viscosity values on 8 types of ration were investigated. Higher viscosity values were observed when cattle were fed high concentrate diet, rice hulls being added as roughage Viscosity varied owing to the form of corn in the ration. Relationship between water Intake and viscosity of rumen fluid in rumen-fistulated sheep was also investigated. Viscosity of rumen fluid was lowered temporarily by water intake. 2. Relationships between the form of feed and ruminal characteristics in sheep fed high concentrate diet Changes of rumen fluid properties in rumen-fistulated sheep fed ration containing cracked, ground, or rolled corn were studied. Periodical changes in viscosity and pH values of rumen fluid from sheep fed cracked corn ration were smaller than those from other sheep. It was suggested that cracked corn remained In the rumen for a longer period as It was dissolved more slowly 3. Changes in ruminal characteristics of sheep after feeding bloat-producing diet Changes in some properties of rumen fluid of sheep were investigated changing the feed from timothy hay to bloat-producing diet (61% barley, 22% alfalfa meal, 16% soybean oil meal and l% sodium chloride). Rumen fluid samples were collected from rumen-fistu-lated sheep just before morning feeding and 2 hours later. The pH value, viscosity, soluble carbohydrate concentration and number As the feed was of protozoa were determined with these samples. changed, pH value declined while viscosity, soluble carbohydrate concentration and number of Entodiniomorphs increased, and sheep to sheep variability became greater Two hours after feeding, pH value had significant negative correlations with the number of Entodiniomorphs, soluble carbohydrate concentration and viscosity, while significant positive correlation (P<0.001) was found between viscosity and soluble carbohydrate concentration 4. Hourly changes in bloat score and rumen pressure of sheep fed bloat-producing diet Hourly changes in bloat score and rumen pressure were investigated using rumen-fistulated sheep fed bloat-producing diet. Bloat score Increased gradually, indicated the highest degree at 3 hours after feeding, and then decreased gradually Rumen pressure changed in the same manner as bloat score 5. Relationships between bloat score and ruminal characteristics in sheep Relationships between bloat score and ruminal characteristics in rumen-fistulated sheep were investigated. Feed was changed from hay to beef cattle ration, and finally to bloat-producing diet. Bloat score, rumen pressure and other ruminal characteristics were determined repeatedly in each period. Significant positive correlation (P<0.001) was found between bloat score and rumen pres sure. Furthermore, bloat score had significant positive correlation with the ingesta volume Increase (IVI) value, the stable IVI value and viscosity (both cell-inclusive and cell free) IC. Changes in ruminal characteristics caused by administration of anti-bloating chemicals l. Effect of monensin on ruminal characteristics and on feeding and ruminating behaviors in sheep Changes of ruminal characteristics and of feeding and ruminating behaviors i
石川県農業短期大学の論文
1985-12-09

反すう動物におけるフィードロット鼓脹症の発生と第一胃内性状との関係に関する研究

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