Abstract:This experiment studied the effects of dietary linoleic acid to α-linolenic acid ratio (LA/ALA) on growth performance and serum biochemical indices of finishing pig. Ninety Duroc×Landrace×Yorkshire crossbred finishing pigs with an average initial body weight of around 70 kg were divided randomly into 6 groups of 15 pigs (5 replicates in each group, 3 pigs per replicate). Dietary LA/ALA of 32:1, 22:1, 13:1, 9:1, 6:1 and 3:1 were obtained by replacing corm oil with the same amount of linseed oil, respectively. The results showed as follows:1) with the decreasing of dietary LA/ALA, average daily gain (ADG) and average daily feed intake (ADFI) of finishing pigs increased first and then decreased (P<0.05), and 13:1 and 9:1 groups were the highest,respectively; while feed/gain was the lowest in 6:1 group, and significantly lower than that in other groups (P<0.05). 2) The dietary LA/ALA of 3:1 significantly increased serum triglyceride content (P<0.05) and high density lipoprotein cholesterol (HDL-C)/low density lipoprotein cholesterol (LDL-C) increased with the decreasing of dietary LA/ALA (P<0.05). Serum total cholesterol, HDL-C and LDL-C contents had no significant difference among groups (P>0.05). 3) Serum immuneglobulin M content significantly increased with the decreasing of dietary LA/ALA (P<0.05). Serum lysozyme activity was the highest in 13:1 group, and significantly higher than that in 32:1, 6:1 and 3:1 groups (P<0.05). Serum interleukin (IL)-2 and IL-6 contents had no significant difference among groups (P>0.05). In conclusion, reducing dietary LA/ALA can improve growth performance, lipid metabolism and immune function of finishing pigs to a certain extent.
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