The influence of ration preparation and level of concentrate upon rumen protozoa and volatile fatty acid production in sheep

Nutritional regulation of insulin and glucagon secretion in sheep

“…On the whole, the hay diet resulted in more volatile fatty acid production than the grain diets. Similar observations were made by Luther (1964). The failure to show a direct relationship between level of grain and propionate production may have been due to two factors.…”

“…Diet is known to have a marked effect on the proportion of volatile fatty acids produced in the rumen. By Increasing the level of grain in a ration, Donefer et al (1963) and Luther (1964) have observed a decrease in the molar proportion of acetic acid with a concurrent increase in the molar proportion of butyric acid. Assuming that volatile fatty acid absorption will reflect rumen concentration (Schambye, 1951) one can postulate that increasing the level of grain in a ration will lead to increased insulin secretion.…”

Interrelationships between protozoa and bacteria in rumen fermentation

“…Apparent digestibility coefficients for rations one and two (Table 2) were determined with six defaunated lambs and six faunated lambs. The lambs were defaunated and six were refaunated as described by Luther (1964). Prior to starting the digestibility trial the lambs were vaccinated for enterotoxemia and allowed to adjust to ration one, Table 2, until all lambs were consuming a constant intake of 1,000 grams per day for 14 days.…”

“…Digestibility coefficients for ration three, Table 2, were determined using 12 cross bred lambs with an average weight of 105 pounds. All lambs were defaunated and onehalf of them were refaunated using the procedure described by Luther (1964) (Table 4), and by bacteria alone it was about 40 percent (Table 3) (Table 6).…”