Learn about 3/4 sibling mating
Why mate brother and sister in gamefowl breeding?
In gamefowl breeding, there are two types of mating between siblings that are commonly discussed in lectures and seminars. One is mating between full siblings or full brother to sister. These are individuals that share the same father and mother. The other is mating between half siblings. These are individuals that share the same father but with different mothers or vice versa. These two are also being discussed thoroughly in lessons at Advanced Breeding Academy.
Full sibling mating is common when one is trying to set a new bloodline. It is supposed to set the same traits as those of the full brother and sister. It is popular for it seems to be the simplest way of maintaining the traits of a generation. Because you are maintaining the genetic composition. For example, a mating between a hatch and a claret will result in 50-50 hatch and claret. Mating full brother with full sister of this generation will maintain the same 50-50 hatch-claret proportion. The breeder is hoping that by breeding full brother to full sister the traits common to both will become homozygous, and thus, pure or fixed.
The big draw back is it might also purify the unseen or recessive bad traits that are also common to both. The first brother sister mating is already intense inbreeding. The inbreeding will become more intense in every succeeding full brother to sister mating. The risk is high.
The mating between half siblings, on the other hand, is bent on keeping the good traits of a single individual. The father or the mother, whichever is the common parent. This is inbreeding and also a form of linebreeding. Because the blood of the common parent will still be 50% of the composition of the offspring. The breeder is tryng to keep the good traits of the common or favored individual at the same time trying to avoid inbreeding depression by keeping the inbreeding coefficient not so high. This is a milder form of inbreeding. It will qualify as linebreeding. Indeed a good form of linebreeding. Students at Advanced Breeding Academy may recall the lessons about the purposes, advantages and disadvantages of inbreeding and linebreeding and will see the entire point of the half sibling mating.
There is, however, another kind of siblings which is not commonly mentioned in gamefowl breeding. The ¾ siblings. The mating between ¾ siblings is more often noted in horse breeding than in gamefowl breeding. However, the ¾ siblings mating is also as useful in gamefowl breeding. Mating of ¾ siblings is highly recommended by breeders. The mating of ¾ siblings, like of full siblings, aims for more homozygosity of the observed good traits. But, it has a kind of defense against the possible pairing of unseen bad traits by providing more genetic diversity. It is a balance between homozygosity of the traits you want and some genetic diversity. In gamefowl breeding you want to fix the observable good traits, at the same time avoid the unseen bad traits from expressing by pairing up themselves. The probability of these bad traits pairing up and manifesting grows higher as the inbreeding coeficient increases. The more genetic diversity will help prevent recessive bad genes from pairing up. At Advanced Breeding Academy there are lessons about purifying or fixing traits without inbreeding.
Learn more about this. Enrol with Advanced Breeding Academy.
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