Domesticated animals and plants; a Domesticated animals and plants; a brief treatise upon the origin and development of domesticated races, with special reference to the methods of improvement domesticatedan00dave Year: 1910 SYSTEMATIC IMPROVEMENT OF ANIMALS 187 standard, then it would be at once necessary to keep records, and the animals so handled would be no longer mixed bred but would be on their way to becoming a new strain of pure breds. 2. Pure breeding, in which only registered animals are used. This system has the advantage of securing the best results, but Fig. 28. Choice feedin
Domesticated animals and plants; a Domesticated animals and plants; a brief treatise upon the origin and development of domesticated races, with special reference to the methods of improvement domesticatedan00dave Year: 1910 SYSTEMATIC IMPROVEMENT OF ANIMALS 187 standard, then it would be at once necessary to keep records, and the animals so handled would be no longer mixed bred but would be on their way to becoming a new strain of pure breds. 2. Pure breeding, in which only registered animals are used. This system has the advantage of securing the best results, but Fig. 28. Choice feeding steer, $ per hundredweight (1910) ; usual price, $ per hundredweight From ' Beef Production,' by Mumford it is relatively costly, especially with horses and cattle, but less so with the smaller and cheaper animals. 3. Grading, in which the sire is pure bred, but the dam is not. This system combines the advantages of both preceding methods. It is but little more costly than the first, and is, for practical purposes, almost as effective as the second, 4. Crossing, in which the sire is of one breed or set of blood lines, as Shorthorn, and the dam of another, as Jersey. This method combines the disadvantages of both the first and second methods in that it is as costly as pure breeding and in the end
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