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The effects of soya-bean oil and type of forage in the diet on the plasma lipid composition of sheep

Published online by Cambridge University Press:  13 April 2010

W. Steele
W. Steele
Affiliation:
Hannah Research Institute, Ayr KA6 5HL
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Abstract

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1. Sheep were given four different diets which contained two types of forage and two types of concentrate. The forage portion of the diet consisted of either hay or silage, while the low-oil concentrate had high levels of starch and in the high-oil concentrate this starch was replaced by an isoenergetic amount of soya-bean oil.

2. The effects of these diets on various factors in the blood was measured.

3. The erythrocytes were more fragile in hypotonic solutions (6.0–8.5 g sodium chloride/l) of saline when they were eating a diet of hay and high-oil concentrates.

4. The levels of calcium, magnesium, phosphorus, glucose and β-hydroxybutyrate in the plasma were unaffected by dietary treatments.

5. Substitution of silage for hay in the diet increased the intake of all fatty acids, especially that of C18:3.

6. When the sheep had low intakes of oil, the change from hay to silage led to increases in the amounts of triglyceride (TG) and total lipid (TL) in their plasma, whereas with high intakes of oil this change of forage increased the plasma TG content by an even greater amount but did not alter the concentration of TL.

7. Increasing the intake of dietary oil raised the levels of both TG and TL in the plasma, irrespective of the type of dietary forage.

8. On silage diets the sheep had much greater amounts of 18:0 and 18:1 fatty acids but smaller quantities of 18:2 fatty acid in their plasma than on hay diets.

9. Changing the dietary forage from hay to silage or the concentrate from low- to high-oil enhanced the levels of all the trans isomers of C18 fatty acids in the blood of the animals.

10. These results imply that unsaturated fatty acids in silage-based diets are hydrogenated to a greater extent in the rumen than those in hay diets which results in an elevation in blood TG levels and that this in turn could profoundly alter such functions as milk fat synthesis and fat deposition in ruminants.

Type
Papers on General Nutrition
Information
British Journal of Nutrition , Volume 44 , Issue 3 , November 1980 , pp. 333 - 341
Copyright
Copyright © The Nutrition Society 1980

References

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