Its lack of pullorum-infected wild birds into the sublines in the place of red-colored-legged little ones deserves discussing
Probably, the male moms and dads of them specimens was basically homozygous on gene W. Inside the several sublines out of 20, in which men parents was in fact heterozygous (Ww), hens having pullorum state was basically known. Solutions from the people is accomplished resistant to the recessive gene w (purple body).
Brand new Banned-and-Speckled Leghorn try a keen egg-installing breed but it’s a bit too big. New alive pounds off Plenty of Fish vs Match 2021 150-day-old pullets try 1.74 and that away from mature hens is actually 2.0-2.step one kilogram. The fresh real time weight from dicks is 2.5 kilogram. Age of readiness try 165 days. Yearly production is actually 220 egg averaging 58 grams. Champ levels provide 270-290 egg a-year. Egg shell are solution or light; alternatives is happening for ointment the color. Fertility out-of eggs are 90-95% and you will hatchability 80%. Emergency rate of one’s younger up to 150 times of years are 95%; from inside 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 are bred having enhanced egg development and combining ability throughout the get across having male adult contours out of 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 studies showed that the fresh new light color of the brand new plumage into the birds gotten inside check out is actually determined by the result from the fresh new partial-principal gene De- with 40% penetrance inside heterozygotes (Dede). The definition of of depigmentation varied significantly from inside the private birds.
Experimental chickens as well as displayed a considerable type throughout the off the colour of the embryo. Plus black, that is regular having Australorps, almost white is actually seen, with quite a few changes among them. If this is certainly a good recessive reputation, the fresh new mating of heterozygotes is bring 25% away from circumstances. This new deviation of one’s observed number (7) throughout the technically questioned (8-9) appeared as if not statistically extreme.
Birds having light embryo down was in fact bred inter se and you will crossed which have chickens that have almost every other down the colour. In the 1973-74, more 5000 like chicks had been hatched. The decisive plumage is actually black having a small depigmentation. It had been affirmed you to white color of the newest embryo off try passed on given that a recessive reputation in relation to black colored and that it’s controlled by brand new autosomal gene sp (spot). The latest gene sp prevents melanin synthesis in the homozygotes not just in various generations of your plumage, and in addition in the shanks. It improves somewhat the appearance of Black Speckled Australorp carcasses (dede spsp), as compared to completely new breed – Black colored Australorps (dede SpSp).
Two F5 people chickens put 33 girls 7 (21%) at which was basically white which have a small black-spot towards the right back
Next breeding are used with this classification and you may elevating away from birds carrying the new De- allele is actually deserted. Birds which have white decisive plumage (DeDe SpSp) had vision faults followed closely by warning signs of exophthalmos and you may anexophthalmos.