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Methods of cross breeding
METHODS OF CROSS BREEDING
Single two way cross or Single cross
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Two different breeds are crossed with each other to produce an F1 which is useful for production purposes and not for breeding.
Breed A and Breed B : Straight bred
F1 progeny AB : Crossbred
Three way crosses (A,B, C)
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The first generation crossbred females are crossed with females of the third breed, then using the hybrid vigor of dam.
Double cross or Four way cross
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There are four breeds are involved in this type of crossbreeding programme. First two breeds are crossed to get F1 and second two breeds are crossed for getting another F1 the both F1s are crossed to produce F2 which having 25% of genes each from four different breeds, so all the different characters are combines well. By inter-se mating the selected characters are fixed in the four way cross
Systematic cross breeding
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Back cross (AB)
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Criss crossing(Reciprocal back crossing)
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Breeds A and B are crossed to produce F1 generation, then F1(AB) females are back crossed to B and F1 (AB) males back crossed to breed A and so on.
Three way rotational cross
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Commercially used in pig industry.
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Breeds A, B, C are crossed in tradition.
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Three way rotational crossing maintain a high degree of heterozygosity. For three way rotation, frozen sem*n/sire can be used without maintaining purebred population.
Last modified: Saturday, 31 March 2012, 11:10 AM
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