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Also the shape of ears, spring of ribs, and general Ibody conformation must be the same, and to be identical twins must be of the same sex.
In nutrition studies one pair of identical twins in one experiment will yield more authentic information than 20 less closely related pairs of calves.
Further informaton may be obtained by writing to the Bureau of Animal Industry U S 1) A. Washington 25, D.‘C., giving youi name ami address, the age, sex, and breed of the calves.
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