155. The composition of mare's milk. II. The variation in composition during lactation. III. The influence of intra-mammary pressure on the composition of milk with special reference to the mare and cow

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Abstract
1. The investigation was for the purpose of ascertaining the cause of the variations previously noted by the author as occurring in mare's milk.2. Determinations have been made of the composition of the milk of eight Shetland ponies and one Clydesdale mare throughout the lactation period, with observations on the milk of numerous thoroughbred mares. The constituents estimated were the total solids, solids-not-fat, protein, fat, lactose, total ash, CaO, P2O5, and chlorine. The CaO, P2O5and chlorine percentages in the ash of the milk were also determined. The freezing-point and pH were recorded in a number of samples. The animals were kept under natural conditions at grass.3. It was found that as lactation advanced the percentage of total solids, lactose and fat of the milk increased in a linear manner, whereas the percentage of solids-not-fat, protein, CaO, and P2O5decreased linearly.4. The regression of the total solids and the chlorine was parabolic in character as also was that of the chlorine-lactose index.

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