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Effect of a whey protein and rapeseed oil gel feed supplement on milk fatty acid composition of Holstein cows

Kliem, K. E., Humphries, D. J., Grandison, A. S., Morgan, R., Livingstone, K. M., Givens, D. I. and Reynolds, C. K. (2019) Effect of a whey protein and rapeseed oil gel feed supplement on milk fatty acid composition of Holstein cows. Journal of Dairy Science, 102 (1). pp. 288-300. ISSN 0022-0302

[img] Text - Accepted Version
· Restricted to Repository staff only until 16 November 2019.
· Available under License Creative Commons Attribution Non-commercial No Derivatives.

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[img] Text - Accepted Version
· Restricted to Repository staff only until 16 November 2019.
· Available under License Creative Commons Attribution Non-commercial No Derivatives.

401kB

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To link to this item DOI: 10.3168/jds.2018-15247

Abstract/Summary

Isoenergetic replacement of dietary saturated fatty acids (SFA) with cis-monounsaturated fatty acids (MUFA) and polyunsaturated fatty acids (PUFA) can reduce cardiovascular disease (CVD) risk. Supplementing dairy cow diets with plant oils lowers milk fat SFA concentrations. However, this feeding strategy can also increase milk fat trans FA (TFA), and negatively impact rumen fermentation. Protection of oil supplements from the rumen environment is therefore needed. In the present study a whey protein gel (WPG) of rapeseed oil (RO) was produced for feeding to dairy cows, in two experiments. In Experiment 1 four multiparous Holstein-Friesian cows in mid-lactation were used in a change-over experiment, with 8-d treatment periods separated by a 5-day washout period. Total mixed ration diets containing 420 g RO or WPG providing 420 g of RO were fed and the effects on milk production, composition and FA concentration were measured. Experiment 2 involved four multiparous mid-lactation Holstein-Friesian cows in a 4 x 4 Latin square design experiment, with 28-d periods, to investigate the effect of incremental dietary inclusion (0, 271, 617 and 814 g/d supplemental oil) of WPG on milk production, composition and FA concentration in the last week of each period. There were minimal effects of WPG on milk FA profile in experiment 1, but trans-18:1 and total trans-MUFA were higher after 8 days of supplementation with RO than with WPG. Incremental diet inclusion of WPG in experiment 2 resulted in linear increases in milk yield, cis- and trans-MUFA and PUFA, and linear decreases in SFA (from 73 to 58 g/100 g FA), and milk fat concentration. The WPG supplement was effective at decreasing milk SFA concentration by replacement with MUFA and PUFA in experiment 2, but the increase in TFA suggested that protection was incomplete.

Item Type:Article
Refereed:Yes
Divisions:Interdisciplinary centres and themes > Institute for Food, Nutrition and Health (IFNH)
Faculty of Life Sciences > School of Agriculture, Policy and Development > Food Production and Quality Division > Animal, Dairy and Food Chain Sciences (ADFCS)
Faculty of Life Sciences > School of Chemistry, Food and Pharmacy > Department of Food and Nutritional Sciences > Food Research Group
ID Code:79496
Publisher:American Dairy Science Association

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