Fatty Acid Digestibility in Lactating Cows Fed Increasing Amounts of Protected Vegetable Oil, Fish Oil or Saturated Fat
作者:
ChristianF. Børsting,
MartinR. Weisbjerg,
Torben Hvelplund,
期刊:
Acta Agriculturae Scandinavica, Section A — Animal Science
(Taylor Available online 1992)
卷期:
Volume 42,
issue 3
页码: 148-156
ISSN:0906-4702
年代: 1992
DOI:10.1080/09064709209410122
出版商: Taylor & Francis Group
关键词: Bile acids;synergism;rape seed oil;soybean oil;encapsulation
数据来源: Taylor
摘要:
Fatty acid digestion was studied in three dairy cows cannulated in the rumen, duodenum and ileum. Cows were fed encapsulated fat sources (vegetable oil, saturated fat and fish oil). A preperiod diet was fed with no added fat. In a graeco-latin design nine diets comprising three levels of each of the three fat sources were fed. The preperiod diet contained 230 g fatty acids (FA), whereas the three other fats were fed at about 550, 850 and 1150 g FA/day. The feed-ileùm true digestibility of total FA was 95, 47 and 86% for vegetable, saturated and fish fat, respectively. The true digestibility of FA was for all fat sources independent of fat level. The FA digestibility of C16:0 was higher than that of C18:0. The experiment supports the theory that unsaturated FA has a synergistic effect on the digestibility of saturated FA. Bile acid secretion was estimated to be 282–550 g/day, with the lowest secretion for fish fat diets. Secretion was independent of the amount of fat fed.
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