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Abstract

The quest for alternative sources of healthy nutrients that facilitate the modification of milk without compromising drinking quality is a continuous research endeavour. The objective of the study was to quantify the milk fatty acid composition of pasture-based primiparous Holstein-Friesian dairy cows supplemented with crude degummed canola oil (CDCO) with a view to improving the milk quality for beneficial health effects. This study tested the hypothesis
that incremental supplementation of grazing primiparous Holstein-Friesian cows with CDCO will alter milk fatty acid
composition towards increased total monounsaturates. Comparisons were made between unsupplemented grazing dairy
cows and their peers on dietary supplements containing low (25ml/Kg DM), medium (35ml/Kg DM) or high levels (50ml/kg DM) of CDCO in addition to ad libitum grazing access to pasture. There was no significant effect (p>0.05) of CDCO supplementation for eight weeks on the proportions of total polyunsaturated fatty acids (tPUFA), omega-3 (w-3)and omega-6 (w-6) fatty acids in milk. However, significant impacts of CDCO were observed on the proportions of 18:1w9c, 18:1w7t, total saturated (tSFA) and total monounsaturated (tMUFA) fatty acids (p<0.005), with a significant increase in the tMUFA/tSFA ratio in cows consuming CDCO. It was concluded that incremental levels of CDCO supplementation can modify the fatty acid composition of milk towards increased monounsaturates without any negative
impact on grazing primiparous cows.

Item Type:	Article
Authors/Creators:	Otto, JR and Malau-Aduli, BS and Nichols, PD and Malau-Aduli, AEO
Journal or Publication Title:	Journal of Nutritional Therapeutics
ISSN:	1929-5634/14
DOI / ID Number:	10.6000/1929-5634.2014.03.02.4
Additional Information:	© 2014 Otto et al.; Licensee Lifescience Global. This is an open access article licensed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.
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