Probably, the male mothers ones specimens were homozygous with the gene W. During the twelve sublines away from 20, where male moms and dads have been heterozygous (Ww), hens which have pullorum situation had been understood. Choice from the populace is achieved from the recessive gene w (red-colored epidermis).

This new Barred-and-Speckled Leghorn is actually an enthusiastic eggs-putting breed but it is too hefty. The brand new alive weight off 150-day-old pullets is 1.74 and that from adult hens are dos.0-2.step one kilogram. This new live pounds from dicks are 2.5 kilogram. Period of readiness is actually 165 weeks. Annual creation is actually 220 egg averaging 58 g. Winner levels offer 270-290 egg annually. Egg shell try lotion or white; options is occurring having cream the colour. Virility out of egg was 90-95% and you can hatchability 80%. Survival speed of your own young doing 150 times of ages are 95%; for the people it is 87%.

The characteristic feature of the new population is an excellent carcass appearance. In this trait they are superior to all known breeds of coloured chickens which carry the dominant gene E. Barred-and-Speckled hens, when mated with cocks of the C₁C₂ male parental form from the cross Hysex white, produce three-line hybrid layers, which are as good as four-way hybrids.

Barred-and-Speckled Leghorns are bred to own increased eggs creation and also for combining ability regarding get across that have male parental lines regarding Light Leghorns.

Black colored SPECKLED AUSTRALORP (Cherno-pestraya avstralorp)

An experimental population was created at the All-Union Research Institute of Farm Animal Breeding and Genetics by breeding inter se descendants of Black Australorps which had been injected intramuscularly with blood from Barred Plymouth Rocks. The total volume of components injected during 11 months amounted to 330-380 ml per bird. The 1962 experiment resulted in 1093 offspring (F₁). Among them were birds in which the juvenile moult produced, instead of black, a partially or completely white plumage. The number of chickens (F₁) with depigmentation in groups which received injections of the whole alien blood, plasma, and blood elements was 4 (2.2%), 2 (1.9%) and 1 (0.9%). The control group had no specimens with white plumage.

Mendelian analysis showed that this new white shade of the brand new plumage within the birds received in this experiment try influenced by the outcome of the fresh new semi-dominating gene De- having 40% penetrance for the heterozygotes (Dede). The word from depigmentation ranged considerably during the private birds.

Experimental chickens and showed a considerable version from the off along with of embryo. In addition to black, that’s normal having Australorps, almost white are observed, with quite a few changes between them. Assuming that it is a good recessive character, brand new mating out-of heterozygotes is always to offer twenty five% regarding times. The brand new deviation of noticed number (7) on the theoretically asked (8-9) looked like perhaps not statistically extreme.

Wild birds that have white embryo down were bred inter se and you may entered with chickens having almost every other off along with. From inside the 1973-74, over 5000 including chicks was indeed hatched. Its definitive plumage are black colored that have hook depigmentation. It actually was affirmed that light color of the fresh new embryo down are passed on as a recessive character in relation to black which it is controlled by the brand new autosomal gene sp (spot). The new gene sp suppress melanin synthesis in homozygotes not only in certain years of plumage, as well as throughout the shanks. It enhances notably the look of Black colored Speckled Australorp carcasses (dede spsp), as compared to fresh reproduce – Black colored Australorps (dede SpSp).

A couple of F5 females chickens lead 33 chicks 7 (21%) at which was indeed white with a little black spot into right back

Further breeding was conducted with this particular class and you can increasing off chickens holding the latest De- allele was left behind. Wild birds with white definitive plumage (DeDe SpSp) got vision defects followed closely by signs and symptoms of exophthalmos and you will anexophthalmos.