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Effects of Concentrate Supplementation on the Fatty Acid Composition of Fat Depots in Crossbred Goats

  • D. E. MushiEmail author
  • L. O. Eik
Chapter
  • 38 Downloads

Abstract

The effects of concentrate diet supplementation on the fatty acid compositions of M. longissimus dorsi (LD), minced meat (MM) and omental fat (OF) in Small East African and Norwegian crossbred goats (9.5 months old, 17.1 kg live weight) were studied. Thirty-two castrated male goats were equally allotted into four levels of concentrate supplementation for 90 days: at 100% (T100), 66% (T66), 33% (T33) and 0% (T0) of ad libitum allowance. In LD and MM, proportions of linolenic acid and other n-3 polyunsaturated fatty acids (PUFA) decreased, whereas that of monounsaturated fatty acids (MUFA), conjugated linolenic acid (CLA) and total desirable fatty acids (DFA) increased with a higher level of supplementation. Concentrate supplementation had limited effect on the fatty acid composition of OF, marked by an increase in t-MUFA and CLA with a higher level of supplementation. Overall, concentrate supplementation beyond 66% of ad libitum feeding had limited effects on fatty acid composition, as depicted by the similarity between T66 and T100 goats in the proportions of oleic acid, CLA, total MUFA as well as n-6/n-3 PUFA ratio in LD and MM. Irrespective of the level of supplementation, LD was associated with higher proportions of total unsaturated fatty acids (UFA), MM with higher proportions of MUFA and OF with higher proportions of total saturated fatty acids (SFA). It is concluded that in order to optimise the healthfulness of goat meat, concentrate supplementation should be limited to 66% of ad libitum feeding. Consumers should be advised to refrain from high intake of internal fat depots due to the abundance of SFA and unfavourable n-6/n-3 PUFA ratios, a risk factor for cardiovascular diseases.

Keywords

Meat Fat depots Fatty acids Crossbred goats Concentrate feeding 

Notes

Acknowledgement

Authors are grateful to the financial support provided by the SUA-EPINAV and Building Stronger Universities (BSU) projects.

Ethical Standard

This experiment complies with the current laws of Tanzania.

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Copyright information

© Springer Nature Switzerland AG 2020

Authors and Affiliations

  1. 1.Department of Animal, Aquaculture and SciencesSokoine University of AgricultureMorogoroTanzania
  2. 2.Department of International Environment and Development StudiesNoragric, Norwegian University of Life SciencesÅsNorway

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