ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2017, Vol. 48 ›› Issue (7): 1260-1270.doi: 10.11843/j.issn.0366-6964.2017.07.010

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Effect of Replacement of Soybean Meal by Oil Cake of Flax Seed in Diet on Growth Performance, Meat Quality, Fatty Acid Content and Blood Biochemical Indicators of Sheep

WU Xiao-dong1, ZHAO Jun-xing1, LIU Wen-zhong1, JIN Ya-qian1, REN You-she1, ZHANG Chun-xiang1, ZHANG Wen-jia2, XIANG Bin-wei2, ZHANG Jian-xin1*   

  1. 1. College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Taigu 030801 China;
    2. Animal Husbandry Bureau of Youyu County, Youyu 037200, China
  • Received:2017-02-04 Online:2017-07-23 Published:2017-07-23

Abstract:

The objective of this experiment was to investigate the effects of soybean cake substituted by oil cake of flax seed in diet on the growth performance, meat quality,fatty acid content and blood biochemical indicators of lambs. A total of 24 F1 Dorper×Small Tail Han sheep (5 month old, (26±1) kg) were randomly selected and equally assigned into 4 groups according to the proportion of flax cake substituting soybean meal (0, 1/3, 2/3 and 1):control group (CK group), treatment Ⅰ, Ⅱ and Ⅲ. The experiment lasted for 60 days. The result showed that:1) There was no significant difference in average daily gain between treatment groups and CK group (P >0.05). Compared with the CK group, the feed to gain ratio of group Ⅱ was significantly declined (P <0.05). 2) There was no significant difference in carcass weight and net meat weight between treatment and CK groups (P >0.05). The dressing percentage, net meat percentage and longissimus dorsi (LD) muscle area of group Ⅲ were significantly higher than those in control group (P <0.05). 3) The flax cake substituting soybean meal in diet effectively declined intramuscular fat content(P <0.05), whereas the pH, water holding capacity and cooked meat percentage were not significantly altered(P >0.05). 4) The flax cake substituting soybean meal in diet significantly increased the content of C20:5N3 in LD muscle(P <0.05), and had no significant effect on saturated fatty acids, monounsaturated fatty acids and polyunsaturated fatty acids (P >0.05). 5) Contents of TC, LDL and activity of SOD were not significantly different between treatment and CK groups (P >0.05). The contents of TG in group Ⅰ and Ⅲ were significantly lower than those in CK group (P <0.05). The content of HDL in group Ⅱ was significantly higher than that in other groups (P <0.05). The contents of UREA in group Ⅱ and Ⅲ were significantly lower than those in group CK and group Ⅰ (P <0.05). The MDA content of group Ⅲ was significantly lower than that of other groups (P <0.05). The activity of CAT in group Ⅲ was significantly higher than that in other groups (P <0.05). Dietary substitution of soybean meal by flax cake can reduce feed to gain ratio and improve the growth performance, reduce blood lipids and improve sheep antioxidant capacity. Therefore, oil cake of flax seed can be used as a protein source of sheep feed, the optimal substitution rate should be more than 2/3.

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