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Profile of fatty acids and activity of elongase and Δ5 and Δ9 desaturase of growing pigs differ in concentration of intramuscular fat in musculus longissimus dorsi

Grzegorz Skiba
The Kielanowski Institute of Animal Physiology and Nutrition, Polish Academy of Sciences, 05-110 Jabłonna, Poland
Abstract :
Pigs of Pietrain (P) and Polish Synthetic line of 990 (S) were slaughtered at 25, 70, 90, 110 and 130
kg BW and the chemical composition of
musculus longissimus dorsi
and its fatty acid profiles were
determined. The Pietrain pigs were characterised by lower (P<0.01) concentration of intramuscular
fat, total SFA (P<0.05) and MUFA (P<0.01) than pigs of the synthetic line 990 at each BW (P<0.05).
Simultaneously the Pietrain breed were characterised by higher (P<0.01) concentration of all acids
belonging to PUFA group. Concentration of total SFA increased (P<0.01) along with increased
body mass of pigs. MUFA was similar at each investigated BW. However, in the case of Pietrain
breed increasing concentration of the PUFA was observed till animals reached approximately 110
kg BW, while in Synthetic line only till 70 kg BW. Similar course was observed in the change of
C18:2n-6 concentration. However, the concentration of C18:3n-3 decreased (P<0.05) along with the
growth of the animals. The course of changes in concentration of C20:3n-6 and C20:4n-6 generally
agreed with the course detected for total amount of PUFA. Activity of the Δ5 desaturase was higher
(P<0.01) in the pigs of the synthetic line. The activity of the investigated enzymes did not differ
between breeds. Activities of the elongase and Δ5 desaturase decreased during the growth of the
pigs. Estimated values of the Pearsons’ correlation between body mass/age of the pigs and activity of
investigated enzymes showed the opposite relationship between them. However, they were stronger
and statistically more significant for the synthetic line of pigs.
Keywords :
breeds / carcass / chemical composition / enzymes activity / fatty acids pigs

Date Deposited : 02 Apr 2015 09:54

Last Modified : 02 Apr 2015 09:54

Official URL: http://www.ighz.edu.pl/?p0=5&p1=34

Volume 31, Number 2, - 2013

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