Conjugated linoleic acid (CLA) refers to a mixture of positional and geometrical isomers of fatty acids with 18 carbon atoms and 2 conjugated double bounds. Some isomers are assumed to play an important role in human health (Pariza et al., 2001). The cis9, trans11 CLA isomer (rumenic acid; RA) is the major CLA isomer in dairy products and it origins partly (more than 70%) from mammary desaturation of trans11 C18:1 (vaccenic acid; VA) and partly from rumen biohydrogenation of linoleic acid (Corl et al., 2001). The enzyme involved in the mammary RA desaturation is stearoyl-CoA desaturase (SCD), that is able to desaturate several other fatty acids found in milk fat. Diet seems to be the major factor of variation of milk CLA content, but also species, breed and individual have been showed as important sources of variation when cows were fed the same diet (Jahreis et al., 1999; Lawless et al., 1999). The aim of this study was to determine the effects of breed, parity and stage of lactation on the levels of CLA and other fatty acids in milk of Italian Friesian and Reggiana cows, maintained on the same commercial dairy farm

Effect of breed, parity and stage of lactation on milk conjugated linoleic acid content in italian friesian and reggiana cows / P. SECCHIARI; M. MELE; A. SERRA; A. BUCCIONI; F. PAOLETTI; M. ANTONGIOVANNI. - In: ITALIAN JOURNAL OF ANIMAL SCIENCE. - ISSN 1594-4077. - STAMPA. - 2 (suppl 2)(2003), pp. 269-271. [10.4081/ijas.2003.s1.269]

Effect of breed, parity and stage of lactation on milk conjugated linoleic acid content in italian friesian and reggiana cows

BUCCIONI, ARIANNA;ANTONGIOVANNI, MAURO
2003

Abstract

Conjugated linoleic acid (CLA) refers to a mixture of positional and geometrical isomers of fatty acids with 18 carbon atoms and 2 conjugated double bounds. Some isomers are assumed to play an important role in human health (Pariza et al., 2001). The cis9, trans11 CLA isomer (rumenic acid; RA) is the major CLA isomer in dairy products and it origins partly (more than 70%) from mammary desaturation of trans11 C18:1 (vaccenic acid; VA) and partly from rumen biohydrogenation of linoleic acid (Corl et al., 2001). The enzyme involved in the mammary RA desaturation is stearoyl-CoA desaturase (SCD), that is able to desaturate several other fatty acids found in milk fat. Diet seems to be the major factor of variation of milk CLA content, but also species, breed and individual have been showed as important sources of variation when cows were fed the same diet (Jahreis et al., 1999; Lawless et al., 1999). The aim of this study was to determine the effects of breed, parity and stage of lactation on the levels of CLA and other fatty acids in milk of Italian Friesian and Reggiana cows, maintained on the same commercial dairy farm
2 (suppl 2)
269
271
P. SECCHIARI; M. MELE; A. SERRA; A. BUCCIONI; F. PAOLETTI; M. ANTONGIOVANNI
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2158/15219
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