ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2015, Vol. 46 ›› Issue (8): 1363-1374.doi: 10.11843/j.issn.0366-6964.2015.08.012

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Study on Composition of Sunit Sheep Body Fatty Acid

SHUANG Jin，AO Li-ge-ri-ma*，AO Chang-jin   

  1. （College of Animal Science，Inner Mongolia Agricultural University，Hohhot 010018，China）
  • Received:2014-01-12 Online:2015-08-23 Published:2015-08-23

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Abstract:

The aim of this study was to understand the influence of age，fattening and anatomic sites on composition of body fatty acid in Sunit mutton sheep，and provide the basis for the effectively utilizing body fat.The slaughter test was conducted by selecting the 1-year-old wether，1.5-year-old wether and 3-year-old wether 6 for each from Sonid Zuoqi Improvement Station grazing group，and 6 fattening lamb from fattening sheep group.The fat were sampled from the tail，suet，net oil and the subcutaneous fat of 6th-7th thoracic vertebra，respectively.At the same time，pasture grass and fattening diet were sampled，and fatty acid composition of them were detected，respectively.The results showed：(1)Value of n-6/n-3 in pasture grass was 2.205∶1，which was significantly lower than that of fattening group(8.779∶1)；(2) With the increasing age，net meat percentage and carcass fat percentage significantly increased(P<0.05)，but there was no significant difference between 1.5-year-old and adult sheep (P>0.05)；(3) With the increasing age，body fat MCFA (P<0.05)，c18∶0 (P<0.05) and c4∶0 SCFA (P<0.05) components increased significantly.In contrast，n-3PUFA (P<0.05) and c18∶1c9 (P<0.01) composition decreased.The values of n-6/n-3 (P>0.05) and S/U (P>0.05) increased；(4) The fattening Sunit sheep body fat MCFA (P<0.05)，c18∶0 (P<0.05) and c4∶0 SCFA (P<0.01) components increased significantly.In contrast，c18∶1c9 (P<0.01) and n-3 PUFA (P<0.05) decreased.The n-6/n-3 value increased (P<0.05).(5) As for saturated fatty acids，there were higher c18∶0 and lower c16∶0 content in net fat and suet (P<0.01)，and higher c16∶0 and lower c18∶0 content in subcutaneous fat (P<0.01).Both of them were relatively lower in tail fat (P<0.01).As for unsaturated fatty acids，the c18∶1c9 (P<0.01) and n-3PUFA were higher in tail fat (P<0.05)，but n-6PUFA was lower (P<0.05).n-6PUFA was higher and c18∶1c9 was lower in net fat.However，all of them were lower in suet and subcutaneous fat.MCFA in subcutaneous fat was significantly higher than that in other 3 adipose tissues (P<0.01)，while there was no significant difference among the other 3 adipose tissues (P>0.05).The n-6/n-3 value from low to high was：tail fat (1.512∶1)<subcutaneous fat (2.435∶1)<suet (2.468∶1)<net fat (2.675∶1) (P<0.05).Diets for grazing sheep had n-3PUFA nutritional characteristics，and diets for fattening sheep had n-6PUFA nutritional characteristics.Sunit sheep growth rate and body fat deposition at early stage was significantly higher than that at later stage.Sunit sheep body fat had n-3PUFA nutritional characteristics，but age and fattening significantly decreased the nutritional characteristics of n-3PUFA.Nutritional value of PUFA in tail fat was much higher than that in net oil and suet，and the worst was in subcutaneous fat.As for the contribution of fatty acid to flavor，tail oil is the best and subcutaneous fat is the worst.

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