Sex of a chick is not a cocks’ fault.
A cock has thirty-nine pairs of chromosomes composed of one pair of sex chromosome and thirty-eight pairs of autonomic chromosomes, while, a hen has one sex chromosome instead of a pair. A cock gives a sex chromosome to every fertilized egg, but a hen gives her sex chromosome to maybe 50% of the fertilized eggs she lay. If the fertilized egg receives sex chromosomes from both the cock and the hen, it will hatch to be a stag (male), but if the egg only has a sex chromosome from the cock, it will hatch out to be a pullet (female).
Remember that as much as possible, always keep youth to one side of the breeding. Breed a proven hen, which is at least two years old, to a young brood cock and vice-versa.
With this information, I guess you can now start in gamefowl breeding. Of course, be sure to provide your birds with the best nutrition and health care available. A comprehensive vaccination program is a must considering that game birds are very susceptible to a wide range of avian pests and poultry diseases.
Lastly, keep track of each chick’s ancestry by keeping good records, giving each brood cock or brood hen its own identification code and marking each of their chicks with the identity off the breeding that produced it. This can be done with toe punching and nose marking, then later with wing and legbands. Through, this you’ll be able to identify which pair of breeding to continue with or to stop
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