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 the milk fatty acid composition of pasture-based primiparous Holstein-Friesian dairy cows with crude 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 . There was no significant effect (p>0.05) of CDCO supplementation for eight weeks the proportions of total polyunsaturated fatty acids (tPUFA), omega-3 (ω-3) and omega-6 (ω-6) fatty acids in milk. However, significant impacts of CDCO observed on the proportions of 18:1ω9c, 18:1ω7t, 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
Highlights
The demand for milk and other dairy products has slightly increased in Australia, with the consumption of drinking milk per capita rising from 104.4 liters in 2010/11 to 106.2 liters in 2011/12, respectively [1]
56 Journal of Nutritional Therapeutics, 2014, Vol 3, No 2 investigating the impact of dietary fat supplementation using crude degummed canola oil (CDCO) on milk fatty acid profiles of pasture-based primiparous cows are at best, scanty or non-existent, the need for this study to fill in the knowledge gap
Contrasting reports on the effect of canola supplementation on milk fatty acids abound in the published literature, but there is a dearth of rigorously peered reviewed information on the use of CDCO as a supplement in pasture-based dairy production systems
Summary
The demand for milk and other dairy products has slightly increased in Australia, with the consumption of drinking milk per capita rising from 104.4 liters in 2010/11 to 106.2 liters in 2011/12, respectively [1]. 56 Journal of Nutritional Therapeutics, 2014, Vol 3, No 2 investigating the impact of dietary fat supplementation using crude degummed canola oil (CDCO) on milk fatty acid profiles of pasture-based primiparous cows are at best, scanty or non-existent, the need for this study to fill in the knowledge gap. Robust knowledge is required about the impact of supplementing lactating cows with CDCO on milk fatty acid composition. Contrasting reports on the effect of canola supplementation on milk fatty acids abound in the published literature, but there is a dearth of rigorously peered reviewed information on the use of CDCO as a supplement in pasture-based dairy production systems. In achieving this paper’s objective, it was hypothesized that incremental supplementation of grazing primiparous Holstein-Friesian cows with CDCO will alter milk fatty acid composition towards increased total monounsaturates
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