Effect of safflower oil supplementation on methane emission from expiratory gas, digestibility and characteristics of rumen liquor in sheep fed with high concentrate diets
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概要
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This experiment was carried out to examine the effect of safflower oil on control of methane emission from expiratory gas and on the relationship between digestibility and characteristics of rumen liquor. Four sheep (55 kg in average body weigh) fitted with rumen fistula were used for this experiment. Animals were fed with concentrate and roughage (Italian ryegrass hay chopped at the length of 2 cm) under 18-20°C in environmental temperature i.e., feeding condition was set 2 : 8 in the ratio of roughage and concentrate, and fed with 80% of <I>ad</I> <I>lib</I>. feeding in the amount of diets, respectively. Safflower oil contained 74.3% linoleic acid of fatty acid composition was supplemented at 0% (control), 2.5%, 5.0% and 7.5% to the diets. Feeding trial was conducted with 4 × 4 Latin square method. Methane emission from expiratory gas was lower in safflower oil supplement than control. As the result, decreasing rate of methane emission from expiratory gas increased with the supplement rate of safflower oil and indicated the range from 14.0 to 47.9. By supplement of safflower oil, digestibility of fibrous components decreased but crude fat digestibility increased. Total digestible nutrients increased significantly in safflower oil supplements. Though the difference of pH in rumen liquor was small among four treatments, NH<SUB>3</SUB>-N concentration changes at low level by safflower oil supplement. Total volatile fatty acid concentration of rumen liquor changed similarly in four treatments. The ratio of acetic acid to propionic acid, however, changed low by supplement of safflower oil. Linoleic acid of rumen liquor changed low after feeding in all treatments. It was shown that there were control of the methane emission from the expiratory gas and improvement effect of nutritive value by safflower oil supplement to the diets.
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