The absence of pullorum-contaminated birds within the sublines versus purple-legged children deserves discussing
Probably, a man moms and dads ones specimens have been homozygous for the gene W. In the a dozen sublines away from 20, where men mothers were heterozygous (Ww), hens having pullorum situation were known. Alternatives throughout the inhabitants is being carried out contrary to the recessive gene w (reddish facial skin).
The Banned-and-Speckled Leghorn was an enthusiastic egg-laying reproduce but it’s a little too hefty. The fresh new alive pounds off 150-day-dated pullets was step 1.74 and that out of adult hens is actually dos.0-dos.1 kilogram. The latest alive pounds out-of cocks are 2.5 kilogram. Age maturity is 165 months. Yearly production is actually 220 eggs averaging 58 g. Champion layers give 270-290 egg a-year. Egg-shell try solution otherwise light; alternatives is occurring to own ointment the colour. Fertility out-of eggs are ninety-95% and you will hatchability 80%. Success rate of the young around 150 days of years is actually 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 try bred having enhanced eggs development and also for merging element regarding cross having men parental outlines out 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. ادامه مطلب … →