Effect of the local forage resource , the “khortane” grass hay , on fatty acid of milk and meat of indigenous goats of Southern Tunisia
2016
Ayeb, N | Addis, M | Fiori, M | Chniter, M | Khorchani, T
The objective of this study was to determine the effect of the local feed resources on fatty acid pro- file of milk and meat of indigenous goat. 20 goats and 18 kids were divided in two groups each and received ad libitum oat hay diet (control diet: C) or mixed grass hay called “khortane” (diet K) in southern Tunisia. All groups received the same commercial concentrate. In the first experiment, milk from C diet goats was poorer in lauric (C12:0; 4.7 per cent of total fatty acids methyl esters) and myristic (C14:0; 10.0 per cent) acids than milk from K group (P less than 0.05). The “khortane” considerably increased the total conjugated linoleic acid content in milk (0.75 vs. 0.64 per cent FAME; P less than 0.05). While the series n-3 fatty acids in milk were similar between the two diets. In addition, the n-6 per n-3 ratio was more favorable in the C diet than in the K diets. In the second experiment, the content of saturated fatty acids (SFA) in meat was similar in the two diets. The mono-unsaturated fatty acids (MUFA) were significantly higher (P less than0.05) in meat of K diet fed (47.4 vs 46.3 per cent FAME). The polyun- saturated fatty acid level (PUFA) was not affected by the dietary treatment. Omega 3 was similar in two groups. The n6 per n3 ratio is significantly affected by the diet; it was lowest in the meat of K group (3.3 vs 4.3). It is concluded that the milk and the meat produced by feeding animal “khortane” show a better nutritional quality, with a higher level of poly-unsaturated fatty acid
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