There were no consistent differences in fat production between the breasts of each individual despite the local custom of beginning all feedings on the right breast. The creamatocrit method was used in detailed studies of variations in breast-milk fat concentrations performed over 12 or 24 hour periods on 60 rural Gambian women. A simple, rational and non-intrusive sampling procedure was devised for the estimation of whole day mean fat levels. The complex pattern of within-feed and between-feed changes in fat concentration was largely explained by differences in volume per feed and time interval between feeds. There was significantly greater between-individual variation in the mean fat concentration per feed over 12 hours. PIP: The study purpose was to establish the pattern of breast milk fat concentration changes that occurs during the day among underprivileged African women feeding on demand and thereby to devise a rational sampling procedure for the estimation of daily mean fat concentrations. It was based on the finding that the mean fat concentration of small samples of milk 0. No consistent difference in fat production between the breasts of each individual was found despite the local custom of starting all feeds on the right breast. The creamatocrit method Lucas et al.
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