Its lack of pullorum-contaminated birds inside sublines instead red-legged kids will probably be worth bringing-up
Most likely, the male moms and dads of those specimens was basically homozygous on the gene W. Into the step step one2 sublines out-of 20, in which male mothers was heterozygous (Ww), hens having pullorum situation have been understood. Possibilities regarding the people is carried out from the recessive gene w (red-colored body).
This new Banned-and-Speckled Leghorn is actually an eggs-installing breed but it’s a bit too big. The new alive lbs from 150-day-old pullets try 1.74 hence off mature hens is actually dos.0-dos.1 kilogram. The brand new real time lbs regarding cocks try dos.5 kilogram. Age of readiness is 165 days. Yearly production is 220 egg averaging 58 g. Winner levels provide 270-290 eggs a year. Egg shell are lotion otherwise white; choice is being conducted for ointment along with. Fertility off eggs are 90-95% and hatchability 80%. Endurance rate of your younger to 150 times of ages was 95%; in the grownups 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 actually bred to have enhanced egg design and also for consolidating element in the cross having male parental contours regarding White 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 investigation showed that the brand new white colour of the fresh plumage when you look at the chickens acquired contained in this test try influenced by the outcome regarding new semi-dominant gene De- which have 40% penetrance within the heterozygotes (Dede). The phrase from depigmentation ranged greatly into the individual birds.
Fresh chickens also exhibited a significant variation throughout the off the colour of the embryo. Including black colored, that’s typical getting Australorps, almost white is actually seen, with several changes between them. Assuming that this is exactly an escort girl North Charleston effective recessive character, the new mating off heterozygotes is to give 25% off times. New deviation of seen count (7) regarding technically asked (8-9) appeared as if perhaps not mathematically significant.
Birds having white embryo down was bred inter se and entered which have birds that have other off the color. In 1973-74, more 5000 particularly chicks had been hatched. Its decisive plumage is black colored which have a slight depigmentation. It was verified that light color of brand new embryo down are passed down since the a great recessive character when considering black colored and therefore it’s subject to the newest autosomal gene sp (spot). New gene sp prevents melanin synthesis inside homozygotes not only in some years of the plumage, and throughout the shanks. So it enhances notably the look of Black colored Speckled Australorp carcasses (dede spsp), compared to the unique reproduce – Black colored Australorps (dede SpSp).
Several F5 ladies chickens lead 33 chicks eight (21%) where was in fact white which have a small black spot into the straight back
Subsequent reproduction was conducted using this type of classification and you can increasing out of birds carrying the fresh new De- allele try discontinued. Birds that have white decisive plumage (DeDe SpSp) got vision problems followed closely by symptoms of exophthalmos and you will anexophthalmos.