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352. Variations in the carotene and vitamin A contents of certain New Zealand butterfats

Published online by Cambridge University Press:  01 June 2009

C. R. Barnicoat
C. R. Barnicoat
Affiliation:
Dairy Research Institute (N.Z.), Palmerston North, New Zealand8
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Extract

1. Chemical estimations of carotene and vitamin A in New Zealand butters from two of the principal butter-making districts of the North Island during the seasons 1935–6 show that the total vitamin A potency was fairly high.

2. There were seasonal variations apparently due to nutritional rather than physiological causes. The minimum values (33–37 i.u./g. butterfat) for total vitamin A were found in late summer (February) at the time when the pasture normally tends to dry up, while the peak values (42–53 i.u./g. butterfat) occurred in late winter and spring (July-October). The variations in vitamin A potency with season were in the opposite direction to the variations recorded in the literature for Europe and America. The difference is no doubt due to the practice of stall-feeding in these countries in contrast with the all-the-year-round grazing commonly practised on dairy farms in New Zealand. The spring flush of grass is also later in the season in Europe than in New Zealand.

3. The more deeply-coloured Jersey butterfat was only slightly richer in total vitamin A potency than Friesian butterfat.

4. Contents of carotene and vitamin A in the fat of colostrum were very high, but reached normal values within 4 or 5 days after parturition.

Type
Original Articles
Information
Journal of Dairy Research , Volume 15 , Issue 1-2 , June 1947 , pp. 80 - 88
Copyright
Copyright © Proprietors of Journal of Dairy Research 1947

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References

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