Most likely, the male mothers of these specimens had been homozygous on the gene W. Into the a dozen sublines off 20, where male moms and dads was heterozygous (Ww), hens having pullorum situation were identified. Options regarding the people will be achieved against the recessive gene w (red-colored facial skin).
The fresh Prohibited-and-Speckled Leghorn is a keen eggs-laying reproduce but it’s a little too hefty. The live lbs away from 150-day-dated pullets try step one.74 which of adult hens is dos.0-dos.step one kilogram. New real time pounds away from dicks was 2.5 kg. Age of readiness is 165 months. Yearly production is actually 220 eggs averaging 58 g. Champion layers bring 270-290 eggs per year. Egg-shell is actually solution or white; solutions is happening getting cream along with. Virility out-of eggs is actually escort backpage Newport News VA ninety-95% and you can hatchability 80%. Success speed of one’s younger doing 150 days of years was 95%; into the people it’s 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 is actually bred getting increased egg manufacturing and for consolidating feature about get across having men adult outlines out of 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 research revealed that the newest white shade of the brand new plumage in the chickens gotten in this try is dependent on the result of the newest semi-dominating gene De- with forty% penetrance for the heterozygotes (Dede). The expression from depigmentation ranged considerably for the private birds.
Experimental birds and additionally presented a significant type on the down the color of your own embryo. Including black, that is regular getting Australorps, nearly light are seen, with lots of changes among them. If this is a good recessive reputation, the latest mating regarding heterozygotes is to promote twenty-five% off times. The fresh new deviation of one’s observed number (7) on technically questioned (8-9) appeared as if not mathematically significant.
Birds that have light embryo down was indeed bred inter se and you will entered having chickens that have almost every other down colour. In 1973-74, over 5000 for example chicks have been hatched. Their definitive plumage is black that have hook depigmentation. It absolutely was confirmed one to white color of the embryo off try passed down due to the fact an effective recessive reputation in terms of black colored and that it is controlled by this new autosomal gene sp (spot). The gene sp suppress melanin synthesis within the homozygotes not only in some years of the plumage, also in the shanks. That it advances somewhat the look of Black Speckled Australorp carcasses (dede spsp), as compared to brand-new breed – Black colored Australorps (dede SpSp).
One or two F5 people birds produced 33 chicks seven (21%) from which were light which have a small black spot towards back
After that breeding is actually conducted using this class and you can elevating off chickens holding brand new De allele is deserted. Wild birds that have white definitive plumage (DeDe SpSp) had eyesight faults followed by the signs of exophthalmos and you can anexophthalmos.