Its lack of pullorum-contaminated birds from inside the sublines in the place of yellow-legged youngsters may be worth mentioning
Its lack of pullorum-contaminated birds from inside the sublines in the place of yellow-legged youngsters may be worth mentioning

Most likely, a man moms and dads of them specimens was indeed homozygous towards the gene W. From inside the several sublines out of 20, where men mothers was indeed heterozygous (Ww), hens with pullorum state was basically known. Solutions on the populace is accomplished contrary to the recessive gene w (red-colored body).

The latest Banned-and-Speckled Leghorn try a keen egg-installing reproduce however it is a bit too hefty. The alive weight off 150-day-dated pullets are step 1.74 hence from adult hens is 2.0-2.step one kilogram. New real time pounds regarding cocks was 2.5 kg. Period of maturity is 165 weeks. Annual design are 220 eggs averaging 58 g. Champ levels offer 270-290 eggs a-year. Egg-shell try solution otherwise white; possibilities is happening to possess lotion colour. Virility out-of eggs was 90-95% and you can hatchability 80%. Endurance speed of more youthful doing 150 days of many years try 95%; when you look at 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 try bred for improved egg design and also for merging ability on mix having men adult contours out of 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%) and 1 (0.9%). The control group had no specimens with white plumage.

Mendelian investigation showed that the new light shade of the plumage for the chickens gotten within try try dependent on the end result out-of the fresh new partial-dominant gene De- with 40% penetrance for the heterozygotes (Dede). The expression from depigmentation ranged considerably inside the individual chickens.

Experimental birds also demonstrated a sizeable version on down colour of embryo. In addition to black, which is typical to possess Australorps, nearly white try seen, with several transitions between the two. Assuming that this will be a great recessive reputation, new mating away from heterozygotes is provide twenty-five% off instances. The deviation of observed count (7) about technically asked (8-9) appeared to be maybe not statistically extreme.

Birds which have light embryo off was indeed bred inter se and crossed with chickens that have other down the color. Inside the 1973-74, over 5000 like chicks was basically hatched. Its www.datingmentor.org/tr/only-lads-inceleme/ decisive plumage are black having a little depigmentation. It absolutely was confirmed you to white colour of new embryo off was handed down as the a great recessive character when it comes to black colored hence it is controlled by brand new autosomal gene sp (spot). The gene sp suppresses melanin synthesis inside homozygotes not just in individuals years of your own plumage, and in addition throughout the shanks. It advances somewhat the look of Black colored Speckled Australorp carcasses (dede spsp), compared to the modern reproduce - Black colored Australorps (dede SpSp).

One or two F5 people chickens produced 33 girls eight (21%) where had been white with a little black-spot toward right back

After that reproduction is actually held using this classification and you may increasing off birds holding the new De- allele try discontinued. Birds that have white definitive plumage (DeDe SpSp) had plans problems followed closely by the signs of exophthalmos and you can anexophthalmos.

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