Probably, a man mothers of these specimens was indeed homozygous on gene W. In a dozen sublines off 20, where men parents were heterozygous (Ww), hens having pullorum problem was in fact understood. Possibilities regarding the population is carried out up against the recessive gene w (reddish epidermis).
The newest Barred-and-Speckled Leghorn is actually an enthusiastic egg-laying breed however it is too heavy. This new live pounds away from 150-day-old pullets is step one.74 and this off adult hens was dos.0-2.1 kilogram. The fresh live pounds of cocks is dos.5 kilogram. Chronilogical age of readiness try 165 days. Yearly manufacturing is 220 egg averaging 58 g. Champ levels give 270-290 egg per year. Egg shell was cream or white; choices is happening having solution along with. Fertility out-of egg is ninety-95% and you will hatchability 80%. Emergency rate of the more youthful doing 150 times of years is 95%; for 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 was bred to own improved egg development as well as combining feature regarding the get across that have men adult traces of 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 study revealed that the newest light shade of brand new plumage within the chickens acquired inside try is actually influenced by the outcome out-of the fresh new partial-prominent gene De- with forty% penetrance into the heterozygotes (Dede). The word out-of depigmentation varied significantly www.datingmentor.org/nl/pansexual-dating-nl when you look at the individual chickens.
Fresh chickens together with showed a sizeable variation regarding off along with of your embryo. Plus black, that is normal getting Australorps, almost light are seen, with lots of transitions between them. If that is a beneficial recessive reputation, this new mating off heterozygotes is always to give twenty five% out-of cases. The newest deviation of one’s noticed number (7) regarding the technically questioned (8-9) looked like not statistically tall.
Wild birds that have light embryo off was indeed bred inter se and you can entered which have chickens with other down the colour. When you look at the 1973-74, over 5000 such as girls had been hatched. Their definitive plumage are black colored that have a small depigmentation. It absolutely was affirmed you to definitely white color of the embryo off is passed on due to the fact an excellent recessive profile when it comes to black and this it’s subject to the latest autosomal gene sp (spot). The brand new gene sp prevents melanin synthesis inside the homozygotes not just in individuals generations of one’s plumage, and also regarding the shanks. This enhances notably the appearance of Black Speckled Australorp carcasses (dede spsp), as compared to brand new reproduce – Black Australorps (dede SpSp).
A couple of F5 girls chickens produced 33 chicks 7 (21%) where was basically light that have a small black-spot with the right back
Subsequent breeding try presented with this particular category and elevating out-of chickens carrying the fresh new De allele are left behind. Birds having white decisive plumage (DeDe SpSp) had sight faults accompanied by warning signs of exophthalmos and you will anexophthalmos.