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Kinder Goat Breeder
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From a study done at Kansas State University:
The results from the Single Comb White Leghorn-Single Comb Rhode Island Red cross showed the hybrids to be generally superior to the pure breeds, but in a few comparisons the hybrids only equaled the better of the two breeds involved.

The crosses of Single Comb White Leghorns by Barred Plymouth Rocks and of Single Comb Rhode Island Reds by Barred Plymouth Rocks produced hybrids that in each case were superior to the pure breeds involved, for chick mortality and rate of growth, these being the only criteria of vigor considered.

The cross of White Leghorn male by Rhode Island Red female had an average pullet-year production of three eggs more than the White Leghorns, which were the better producers of the two pure breeds. The reciprocal cross did not lay so well as the White Leghorns, but considerably better than the Rhode Island Reds.

Here's the full paper:
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