The absence of pullorum-infected birds in the sublines in the place of red-legged little ones may be worth mentioning

Most likely, the male mothers of those specimens was homozygous toward gene W. In the several sublines of 20, in which men parents were heterozygous (Ww), hens which have pullorum disease was indeed recognized. Selection on inhabitants is carried out against the recessive gene w (reddish epidermis).

The Banned-and-Speckled Leghorn is an enthusiastic egg-laying reproduce but it’s a touch too heavier. The fresh new alive lbs out of 150-day-old pullets is actually step 1.74 and therefore off adult hens try dos.0-dos.step 1 kg. New alive weight off cocks try 2.5 kg. Age readiness is actually 165 days. Annual development try 220 eggs averaging 58 grams. Champion layers offer 270-290 egg per year. Egg-shell is ointment otherwise white; possibilities is happening for lotion along with. Virility regarding egg try ninety-95% and hatchability 80%. Survival rates of your own young up to 150 days of decades try 95%; when you look at 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 having enhanced egg development as well as for consolidating element regarding the cross having male parental outlines of White 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 studies indicated that new white color of new plumage inside birds received contained in this experiment are determined by the result out-of the brand new semi-dominant gene De having forty% penetrance inside the heterozygotes (Dede). The word out-of depigmentation varied significantly into the personal chickens.

Experimental chickens including showed a considerable variation regarding off the color of your embryo. As well as black, which is typical to possess Australorps, almost light was noticed, with several transitions between them. Providing this might be an excellent recessive profile, the latest mating out of heterozygotes is render twenty-five% out-of times. New deviation of the observed matter (7) regarding officially questioned (8-9) appeared to be not statistically tall.

Birds having white embryo down were bred inter se and entered with chickens having most other off along with. In 1973-74, over 5000 such chicks were hatched. The decisive plumage is black that have a small depigmentation. It actually was affirmed you to definitely white shade of the latest embryo off was passed down because a beneficial recessive profile regarding black and therefore it’s controlled by the fresh autosomal gene sp (spot). The new gene sp suppresses melanin synthesis for the homozygotes not only in some generations of one’s plumage, as well as about shanks. Which enhances significantly the look of Black Speckled Australorp carcasses (dede spsp), versus brand new reproduce – Black Australorps (dede SpSp).

A couple of F5 ladies birds produced 33 girls seven (21%) at which was light with a small black spot with the straight back

Further reproduction is held using this type of classification and raising out-of birds holding this new De- allele is actually discontinued. Wild birds having white decisive plumage (DeDe SpSp) had plans faults with signs and symptoms of exophthalmos and you will anexophthalmos.