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Influence of Supplemental Feed Choice for Pasture-Based Cows on the Fatty Acid and Volatile Profile of Milk

1
Food Chemistry and Technology, Teagasc Moorepark Food Research Center, Moorepark Fermoy, P61 C996 Co. Cork, Ireland
2
Teagasc Animal and Grassland Research, Moorepark Fermoy, P61 C996 Co. Cork, Ireland
*
Author to whom correspondence should be addressed.
Foods 2019, 8(4), 137; https://doi.org/10.3390/foods8040137
Received: 15 March 2019 / Revised: 16 April 2019 / Accepted: 18 April 2019 / Published: 22 April 2019
(This article belongs to the Section Dairy)
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Abstract

The purpose of this study was to examine the impact of a variety of supplemental feeds on the composition and quality of milk in a pasture-based dairy system. Four pasture-supplemented feeding systems were compared: Group 1 supplementation with 16% crude protein parlour concentrate (CONC); Group 2 supplementation with palm kernel expeller plus parlour concentrate (PKE); Group 3 supplemented with soya hulls plus parlour concentrate (SOYA); Group 4 was supplemented with molassed beet pulp plus parlour concentrate (BEET). Supplemental feeding system was demonstrated to have a significant effect on the size of native casein micelles and the gelation properties of milks. While CONC feeding produced significantly higher casein micelle size, gel strength (Young’s Modulus) was significantly negatively correlated with casein micelle size. Supplemental feeding system had a significant effect on a number of fatty acids (FA) and indices derived therefrom, including total saturated and unsaturated fatty acids, de novo produced FA, omega 3, and omega 6 FA. The volatile profile of milks was also affected by supplemental feed choice, whereby multivariate analysis demonstrated that the CONC diet was distinctly different to that of the PALM, SOYA, and BEET milks. Multivariate analysis demonstrated that it is possible to distinguish milks from different pasture-supplemented feeding systems by their FA profile. View Full-Text
Keywords: dairy; fatty acids; pasture; feed supplements; milk composition; cow diet dairy; fatty acids; pasture; feed supplements; milk composition; cow diet
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O’Callaghan, T.F.; Mannion, D.; Apopei, D.; McCarthy, N.A.; Hogan, S.A.; Kilcawley, K.N.; Egan, M. Influence of Supplemental Feed Choice for Pasture-Based Cows on the Fatty Acid and Volatile Profile of Milk. Foods 2019, 8, 137.

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