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Effect of forage/concentrate ratio and oil supplementation on C18:1 and CLA isomers in milk fat from Sarda ewes

M. Antongiovanni 1  ,  
M. Mele 2,  
A. Buccioni 1,  
F. Petacchi 1,  
A. Serra 2,  
M. P. Melis 3,  
L. Cordeddu 3,  
S. Banni 3,  
Dipartimento di Scienze Zootecniche, Università di Firenze, Italy
D.A.G.A.- Sezione Scienze Zootecniche, Università di Pisa, Italy
Dipartimento di Biologia Sperimentale, Università di Cagliari, Italy
J. Anim. Feed Sci. 2004;13(Suppl. 1):669–672
Publish date: 2004-08-30
Sixteen lactating Sarda ewes were fed 4 diets differing in the forage/concentrate ratio (2 diets 75/25, 2 diets 60/40, DM) and in soyabean oil supplementation (2 diets with 100 g/head/d oil, 2 diets with no oil), in a 4x4 Latin square design. The inclusion of soyabean oil in the diet resulted in a significant increase of both rumenic acid (cis 9 trans, 11 CLA) and vaccenic acid (trans 11 C18:1) in milk fat, with higher increases with the 2 high forage diets. The 2 low forage diets allowed increases of trans 10 C 18:1 and of trans 10, cis 12 CLA, probably due to a shift of rumen biohydrogenation of linoleic acid.
M. Antongiovanni   
Dipartimento di Scienze Zootecniche, Università di Firenze, Italy
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