. The physiology of reproduction. Reproduction. 668 THE PHYSIOLOGY OF REPRODUCTION The calf at birth weighs about 77 pounds, and the average daily increase during the first two years is 1'5 pounds. With the sheep the increase is greater, for a young lamb in ten days can add fifty per cent, to its original weight, and can double it at the end of the first month, and treble it at the end of the second. In pigs, however, the increase is even more rapid, for a young pig can add twenty per cent, to its original weight by the end of the first week, and up to the end of the fiist year can add an aver
. The physiology of reproduction. Reproduction. 668 THE PHYSIOLOGY OF REPRODUCTION The calf at birth weighs about 77 pounds, and the average daily increase during the first two years is 1'5 pounds. With the sheep the increase is greater, for a young lamb in ten days can add fifty per cent, to its original weight, and can double it at the end of the first month, and treble it at the end of the second. In pigs, however, the increase is even more rapid, for a young pig can add twenty per cent, to its original weight by the end of the first week, and up to the end of the fiist year can add an average daily increase of 0'44 pound. In Man growth is most rapid during the first year of life,. 03i6l3l8U28U38 4G 56 66 BlUau^ Fig. 146.—(From Minot's Problem of Age, Growth, and Death, G. S. Putnam & Sons, and John Murray.) when a child is able to increase its weight by 200 per cent. For the second year this percentage drops to twenty, and for subse- quent years up to about the age of thirteen, it fluctuates around ten, showing a gradual tendency to decrease (but cf. Robertson, quoted on p. 662). After this there is a distinct increase in the percentage increment representing the prepubertal and pubertal growth. Then there is a further decline in the power of growth, which gradually diminishes. The prepubertal growth of girls usually precedes that of boys, so that between the ages of twelve and fifteen girls are often heavier and taller than boys. Boys grow most rapidly at sixteen, girls at thirteen or fourteen. Boys attain their full height at from twenty-three to twenty-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marshall, F. H. A. (Francis Hugh Adam), 1878-1949; Cramer, William, 1878-1945; Lochhead, James. London, New York, Longmans, Green
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