Most likely, the male moms and dads of them specimens was in fact homozygous for the gene W. From inside the step 12 sublines away from 20, where men mothers was basically heterozygous (Ww), hens that have pullorum state was indeed known. Possibilities throughout the inhabitants will be achieved resistant to the recessive gene w (yellow surface).
Brand new Barred-and-Speckled Leghorn is actually an eggs-laying breed but it is a little too hefty. The newest alive pounds off 150-day-old pullets is actually step one.74 which regarding adult hens was 2.0-2.step 1 kilogram. The real time weight from dicks is 2.5 kilogram. Period of maturity try 165 weeks. Yearly manufacturing was 220 egg averaging 58 grams. Winner levels give 270-290 eggs a year. Egg-shell is actually ointment otherwise white; choices is being conducted to possess cream along with. Fertility regarding egg is actually ninety-95% and hatchability 80%. Endurance price of your own young to 150 days of years is actually 95%; from inside the adults 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 are bred to have enhanced eggs creation and also for merging feature in the mix that have men parental contours from 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 data revealed that the newest light shade of the plumage Bezoek website in chickens gotten contained in this test is actually dependent on the result from the semi-prominent gene De- which have 40% penetrance in the heterozygotes (Dede). The expression out-of depigmentation ranged significantly within the personal birds.
Experimental chickens together with exhibited a sizeable adaptation throughout the off the color of embryo. And black, that’s typical getting Australorps, nearly light was seen, with many transitions between them. Provided that this will be good recessive character, brand new mating out of heterozygotes is always to provide twenty five% off times. The fresh departure of the observed amount (7) in the commercially questioned (8-9) appeared to be perhaps not mathematically high.
Birds that have white embryo down have been bred inter se and you will entered with chickens with most other down along with. From inside the 1973-74, more than 5000 like girls was basically hatched. Their definitive plumage try black colored having a small depigmentation. It had been verified that light shade of new embryo off are inherited given that a recessive character in relation to black hence it’s subject to the new autosomal gene sp (spot). The newest gene sp suppresses melanin synthesis within the homozygotes not just in various generations of your own plumage, plus regarding the shanks. It improves somewhat the appearance of Black Speckled Australorp carcasses (dede spsp), compared to the modern reproduce – Black Australorps (dede SpSp).
A few F5 people birds delivered 33 chicks 7 (21%) at which was in fact white that have a small black-spot toward back
Further breeding try held with this group and you can elevating from chickens carrying brand new De allele try abandoned. Birds having light definitive plumage (DeDe SpSp) got vision defects followed by apparent symptoms of exophthalmos and you will anexophthalmos.
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