Most likely, the male parents of those specimens had been homozygous toward gene W. Inside several sublines out-of 20, where men parents was in fact heterozygous (Ww), hens that have pullorum condition were understood. Solutions throughout the society is being carried out resistant to the recessive gene w (purple body).
The brand new Barred-and-Speckled Leghorn is an enthusiastic eggs-laying reproduce however it is https://datingmentor.org/pl/phrendly-recenzja/ a bit too hefty. The new live weight out-of 150-day-old pullets is step one.74 and that of adult hens are 2.0-2.step 1 kg. New alive weight off cocks are dos.5 kilogram. Period of readiness is actually 165 months. Yearly development is actually 220 eggs averaging 58 grams. Champion layers give 270-290 eggs annually. Egg-shell is actually solution otherwise light; alternatives is occurring getting lotion the color. Virility out-of egg are 90-95% and you can hatchability 80%. Endurance speed of your younger doing 150 days of years are 95%; into the 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 try bred to have enhanced eggs creation and consolidating element on the mix that have men adult lines of White 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 analysis revealed that the brand new light color of the latest plumage inside the birds received contained in this experiment try dependent on the result regarding the fresh semi-dominating gene De with forty% penetrance in heterozygotes (Dede). The word from depigmentation ranged greatly within the personal chickens.
Experimental chickens in addition to displayed a considerable version throughout the off along with of one’s embryo. Plus black colored, which is normal to own Australorps, almost white was observed, with lots of changes among them. Provided this will be an excellent recessive character, brand new mating off heterozygotes is provide twenty five% away from circumstances. The latest deviation of noticed number (7) in the commercially expected (8-9) looked like perhaps not statistically high.
Birds having white embryo down have been bred inter se and crossed that have birds with most other down along with. Into the 1973-74, more than 5000 such chicks was hatched. Its decisive plumage is actually black colored which have hook depigmentation. It absolutely was verified that light shade of the newest embryo off was passed on given that an excellent recessive character in terms of black colored and this it is controlled by the brand new autosomal gene sp (spot). The new gene sp inhibits melanin synthesis during the homozygotes not only in certain years of your own plumage, in addition to on shanks. Which enhances significantly the appearance of Black Speckled Australorp carcasses (dede spsp), versus amazing breed – Black colored Australorps (dede SpSp).
A couple F5 females chickens lead 33 chicks seven (21%) at which was in fact white having a small black spot toward right back
Next breeding are used with this class and raising out-of chickens holding this new De- allele are discontinued. Wild birds having light definitive plumage (DeDe SpSp) got eyesight flaws followed closely by the signs of exophthalmos and anexophthalmos.