The transmission of vitamin A from parents to young in mammals

Dann, W. J.

doi:10.1042/bj0271998

Cited by 46 publications

(10 citation statements)

References 4 publications

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“…It would, therefore, be of benefit to milk processors to have a means of estimating the colostrum content of the milk supplied. The most obvious characteristics of colostral milk are the high concentrations of carotene (Dann, 1933) and immunoglobulins (Smith, 1946). However, if either substance is to be taken as an index of the colostrum content of bulked milk, quantitative data on their levels and variations in both colostrum and milk must be considered.…”

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confidence: 99%

“…A number of workers have shown that the carotene (Dann, 1933;Hansen et al 1946;Thompson & McGillivray, 1957;Grieb, 19686) and the immunoglobulin (Larson & Kendall, 1957;Jurenkova, Popovici & Raitaru, 1967;Grieb, 1968a;Dolezalek & Gajdusek, 1970) concentrations decrease rapidly after parturition to reach those normal in milk by the fifth to tenth day of lactation. These reports, and others (Hopf, 1969;Klaus, Bennett & Jones, 1969) indicate a wide variation in the levels of both substances in the colostrum of different cows.…”

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Carotene and immunoglobulin concentrations in the colostrum and milk of pasture-fed cows

Newstead¹

1976

Journal of Dairy Research

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SummaryThe carotene and immunoglobulin concentrations in colostra and milks of 6 Jersey, 4 Friesian and 6 Jersey × Friesian cows were determined during the first 21 d of lactation. Carotene concentrations of between 50 and 300 μg/g milk fat were found at first milking and these declined to normal concentrations, in the range 9–21 μg/g milk fat, by the eighth to tenth day of lactation. Immunoglobulin concentrations at first milking were in the range 4–40 g/l milk and decreased to normal concentrations, in the range 0·3–0·5 g/l, by the fifth to seventh day of lactation. For both substances the data from each cow's milk fitted an exponential decay model. The fractional rates of decrease in concentration of carotene were 0·19–0·57/d and of immunoglobulin were 0·40–0·73/d. Breed-group differences were observed in both carotene and immunoglobulin concentrations in milks after the fourteenth day of lactation. In Jersey milks, the average carotene and immunoglobulin concentrations were respectively 18·5 μg/g milk fat and 0·32 g/l of milk, while in Friesian milks the concentrations were respectively 11·4 μg/g milk fat and 0·46 g/l milk. There was also a difference between breed groups in the daily rates of decrease of the immunoglobulin concentrations. The average rate of decrease for the Friesians was about 1·5 times the rate for the Jerseys.

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confidence: 99%

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confidence: 99%

Carotene and immunoglobulin concentrations in the colostrum and milk of pasture-fed cows

Newstead¹

1976

Journal of Dairy Research

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“…The high vitamin A value of cow's colostrum has previously been demonstrated biologically by Dann [1933] in England, and spectroscopically by Semb et al [1934] in America. The latter authors have shown that the high potency of the colostral milk persists for only a few days after the calf is born before dropping to a more normal value, a fact which is fully confirmed by the present results.…”

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confidence: 99%

“…Studies of some of these variations in the milk of English cows have previously been made using either colorimetric or biological methods of assay [Dann, 1933;Booth et al, 1933;1934], but at the time this investigation was commenced, no comprehensive study of the variations in the carotene and vitamin A contents of milk, using the more precise spectrophotometric methods of assay, had been made. Since then, however, thorough investigations of the fat of milk produced under American conditions of management have been carried out , using the spectrophotometric method developed earlier .…”

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Variations in the carotene and vitamin A values of the milk fat (butter) of cattle of typical English breeds

Gillam

Heilbron

Ferguson³

et al. 1936

Biochemical Journal

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“…(3) The vitamin C content of colostrum The relatively very high concentrations of carotene and vitamin A in colostrum as compared with milk [Dann, 1933;Semb et al 1934] made it of interest to investigate the level of vitamin C in the colostral secretion. Table II presents the results of such estimations in the case of 4 cows, while the average values are plotted in Fig.…”

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confidence: 99%