The technique , described in the Journal of Dairy Science, is based on getting omega -3 fatty acids with which it supplements the diet of cattle arrive intact to the small intestine , preventing its passage through the main cavity of the stomach of ruminants the rumen.
Milk is a food very poor in omega -3 fatty acids . So far , most efforts to enrich omega-3 milk naturally were based on an increase in the amount of such fatty acids in the diet of livestock. However, when the omega-3 fatty acids pass through the rumen, the modified microorganisms enzymatically converting them into other fatty acids without their biological value . This means that only a very small amount of omega- 3 is transferred to milk fat eventually .
To avoid the enzymatic transformation , called biohydrogenation , this research has focused on preventing fatty acids pass through the rumen to reach the intestine intact . This has been used goats trained from birth for maintaining active reticular reflex leak into adulthood , being otherwise functional ruminants .
" The reflection of the grid leak is a natural mechanism possessed by ruminants during the first weeks of life , which allows ingested milk bypasses the rumen. This mechanism disappears when animals are weaned . To keep the leak reflection lattice , we have made use of sensory stimuli , especially visual , offering a bottle daily in a small amount of milk replacer to animals from weaning " says researcher Research Institute of Food Science CSIC Miguel Angel de la Fuente .
Source of omega -3
According to this study , milk obtained by this new method has a content of omega-3 fatty acids , particularly a-linolenic acid , 13% , ie 10 times more than when food passes through the rumen enriched . " It is a percentage of omega -3 unpublished so far, which multiplies by 50 the usual values ??of a- linolenic acid present in milk fat from ruminants that have not received any lipid supplement ," says De la Fuente . It adds the researcher , this strategy reduces substantially simultaneously milk content of trans fatty acids and the percentage of saturated fatty acids, both considered unhealthy from a nutritional standpoint .
According to the legislation in force in the European Union , this milk has a content of a-linolenic acid required to be double the so-called " rich in omega- 3" and could be described as " high in omega -3 fatty acids " .
A. L. Martínez Marín, P. Gómez-Cortés, D. Carrión Pardo, N. Núñez Sánchez, G. Gómez Castro, M. Juárez, L. Pérez Alba, M. Pérez Hernández, and M. A. de la Fuente. Short communication: Feeding linseed oil to dairy goats with competent reticular groove reflex greatly increases n-3 fatty acids in milk fat. Journal of Dairy Science. DOI: 10.3168/jds.2013-7041
Photograph: CSIC press release.