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Effect of caustic-treated linseed on the composition of cow's milk

  • R M Kirkland (a1), J.R. Scaife (a1) and M. Goodwill (a2)

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In ruminant diets, whole oilseeds are potential sources of polyunsaturated fatty acids (PUFA), which, because they are protected by the intact seed pericarp, may escape rumen biohydrogenation (Murphy et. al., 1990). Some seed coats are highly resistant to microbial and enzymic digestion and seed lipids may therefore be poorly degraded. Mild chemical treatment of oilseeds with sodium hydroxide has been suggested as a way to allow only limited ruminal lipid digestion but more extensive intestinal digestion of seed lipids (Aldrich et. al., 1997). Such treatments may allow the manipulation of milk composition by strategic use of selected oilseeds. Linseed is rich in C18:3n-3, an essential component of a healthy human diet which is normally only present at low levels in cows milk. This study evaluated the effect of inclusion of caustic-treated linseed in dairy cow rations on the protein, fat and fatty acid composition of milk

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Aldrich, C.G., Merchen, N.R., Drackley, J.K., Gonzalez, S. S. Fahey, G C. Jnr., and Berger, L.L. (1997) The effects of chemical treatment of whole canola seed on lipid and protein deposition in steers. J. Anim. Sci. 57 502511.
Murphy, J. J., McNeill, G. P., Conolly, J. F. and Gleeson, P. (1990) Effects on cow performance and milk fat composition of including full-fat soyabeans and rapeseed in the concentrate mixture for lactating dairy cows. J. Dairy Res. 57 295306.

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