Most likely, a man moms and dads of them specimens was indeed homozygous on gene W. Inside the twelve sublines of 20, where men mothers were heterozygous (Ww), hens having pullorum disease was in fact understood. Choice in the population has been accomplished contrary to the recessive gene w (red-colored epidermis).
Brand new Prohibited-and-Speckled Leghorn was an enthusiastic eggs-putting reproduce but it’s a bit too hefty. Brand new real time pounds off 150-day-old pullets try 1.74 which out of mature hens try 2.0-2.step 1 kilogram. The real time lbs from dicks are 2.5 kilogram. Chronilogical age of readiness are 165 days. Yearly production is actually 220 egg averaging 58 g. Winner layers promote 270-290 egg a-year. Egg shell are lotion otherwise light; alternatives is happening to have cream along with. Virility out of eggs was 90-95% and you will hatchability 80%. Emergency speed of your young to 150 times of ages are 95%; into 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 is bred for enhanced egg design as well as merging element from the mix with male parental contours away from 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 research revealed that the newest white shade of brand new plumage inside chickens received in this try out try influenced by the outcome out of the partial-dominating gene De that have forty% penetrance for the heterozygotes (Dede). The definition of from depigmentation ranged considerably in personal birds.
Fresh birds together with showed a significant variation throughout the down along with of one’s embryo. In addition to black, that’s regular to possess Australorps, almost white try observed, with quite a few transitions among them. Provided it is good recessive character, the latest mating of heterozygotes is to give twenty five% from times. This new deviation of the seen matter (7) from the technically asked (8-9) looked like not statistically significant.
Wild birds with white embryo off were bred inter se and you can crossed having chickens with most other off colour. Inside 1973-74, over 5000 such chicks 
was basically hatched. Their decisive plumage is black with a small depigmentation. It actually was verified one white colour of the fresh new embryo down is actually handed down because the an effective recessive profile with regards to black hence it’s subject to the fresh new autosomal gene sp (spot). The gene sp suppresses melanin synthesis into the homozygotes not only in certain generations of your plumage, and also throughout the shanks. Which advances significantly the look of Black colored Speckled Australorp carcasses (dede spsp), as compared to totally new breed – Black colored Australorps (dede SpSp).
Two F5 ladies chickens put 33 girls eight (21%) of which was indeed light which have a small black-spot toward right back
Subsequent reproduction try presented using this type of class and increasing out-of birds holding the fresh De allele are discontinued. Birds having light decisive plumage (DeDe SpSp) got eyesight defects accompanied by apparent symptoms of exophthalmos and you will anexophthalmos.
