Probably, the male moms and dads of these specimens was basically homozygous towards gene W. Inside several sublines off 20, in which male moms and dads was indeed heterozygous (Ww), hens having pullorum situation was identified. Possibilities from the population is carried out up against the recessive gene w (red-colored body).
This new Prohibited-and-Speckled Leghorn try a keen eggs-laying breed however it is a touch too heavy. The new real time pounds from 150-day-old pullets is 1.74 hence off adult hens is actually 2.0-dos.step one kg. The alive pounds off dicks try 2.5 kg. Age of readiness are 165 weeks. Annual design try 220 egg averaging 58 grams. Winner levels offer 270-290 egg annually. Egg shell is actually cream or white; selection is occurring for cream along with. Fertility of eggs are 90-95% and you can hatchability 80%. Endurance price of one’s more youthful up to 150 days of years are 95%; inside grownups 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 was bred to possess increased eggs manufacturing and also for combining feature on get across which have male adult lines regarding Light Leghorns.
Black 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%) live escort reviews Fontana and 1 (0.9%). The control group had no specimens with white plumage.
Mendelian investigation showed that brand new light color of new plumage from inside the chickens gotten contained in this test was dependent on the end result regarding the latest partial-principal gene De with 40% penetrance within the heterozygotes (Dede). The definition of out-of depigmentation ranged considerably in personal chickens.
Experimental birds in addition to exhibited a sizeable variation regarding the down the colour of your own embryo. Including black colored, which is regular to have Australorps, nearly white try noticed, with many different changes between them. Providing this might be an excellent recessive profile, the new mating of heterozygotes is to offer 25% out of circumstances. The new deviation of your observed number (7) on the commercially questioned (8-9) looked like perhaps not statistically high.
Wild birds which have light embryo off was in fact bred inter se and you can crossed which have birds which have most other down the colour. Inside the 1973-74, over 5000 like girls have been hatched. The decisive plumage are black colored having hook depigmentation. It was confirmed that white colour of the brand new embryo down are passed down once the an excellent recessive reputation in terms of black and that it’s controlled by new autosomal gene sp (spot). The newest gene sp prevents melanin synthesis into the homozygotes not only in various generations of your own plumage, but also regarding the shanks. So it enhances somewhat the look of Black Speckled Australorp carcasses (dede spsp), compared to the modern breed – Black colored Australorps (dede SpSp).
A few F5 female chickens delivered 33 girls 7 (21%) where have been light that have a small black-spot to your back
After that reproduction are held with this specific classification and increasing off chickens holding the newest De- allele is left behind. Birds having light definitive plumage (DeDe SpSp) got plans defects with outward indications of exophthalmos and you can anexophthalmos.