The relation between desaturase activity and conjugated linoleic acid (CLA) content in fat tissues of holstein steers fed steam dried tofu cake
2006
Inada, S.(Fukuoka-ken. Agricultural Research Center, Chikushino (Japan)) | Koga, T. | Isozaki, Y.
Thirty-three Holstein steers were divided into six groups to investigate the relation between desaturase activity and conjugated linoleic acid (CLA) content in the fat tissues of Holstein Steers fed steam dried tofu cake (SDTC). Group A, B and C were fed a fattening diet supplemented with 0%, 12.5% and 25% of SDTC (as a dry basis %) respectively, during the fattening period. Group D, E and F were fed a fattening diet supplemented with 12.5% of SDTC for only the first and second fattening periods and during the whole fattening period respectively. The fatty acid compositions in the M. longissimus dorsi, subcutaneous and perinephric fats taken from the carcasses of all of the groups were investigated. In all of the fat tissues of Group B and C, the conjugated linoleic acid (CLA) and trans-11 vaccenic acid (TVA) compositions had increased compared with those of Group A. In the subcutaneous fats of Group E and F, the CLA composition had increased compared with those of Group D. Although there was no difference in the CLA/TVA values with all the fats taken from the carcasses of the all groups, desaturas activity (C17:1/C17:0) had decreased from the SDTC supplementation in their diet. CLA/TVA and C17:1/C17:0 in the subcutaneous fat were the highest and those in the perinephric fat were the lowest of all the other fat tissues.
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