Exercise 7 Sexing Flashcards
(17 cards)
_
- method of distinguishing (differentiating) female from the male poultry species
- usually done in commercial hatcheries
Sexing
Purpose for Sexing
- _ _ _ - reduced cost of rearing chickens by 50%
- _ _ _ _ _
- male (broiler chickens)
- female (layer chickens)
- _ _ _ _ _
DPP
- Different feeding program
- Production purpose of either sex
- Preference of grower or raiser
Methods of Sexing
A. / Sexing
1. / Sexing
2. / Sexing
B. _ Sexing
1. _ Sexing
2. _ Sexing
BMC
ACF
A. Biochemical/Histological Sexing
1. Machine/Instrumental S
2. Cloacal/Vent S
B. Auto Sexing
1. Color S
2. Feather S
Methods of Sexing
_ Sexing
- chromosomal karyotyping
- characterization by DNA analysis
- used for very expensive birds (otherwise uneconomical)
A. Biochemical Sexing
Methods of Sexing
_ Sexing (1950s)
- uses a blunt optical instrument (similar to proctoscope or endoscope)
- sexer inserts tube with a light in the cloaca further into the LI
- left: ovaries
- right and left: testicle
- requires training and can cause more damage than cloacal sexing
- Machine Sexing
Methods of Sexing
_ Sexing (1935)
- developed by Japanese (ldest and most common method)
- requires extensive training (months)
- accurate (95%) and rapid
- used by non-auto sexing line (turkey, Cobb) and breeder companies
- has potential for injuries and deaths
- Vent Sexing
Sexing other species (geese)
- Cloacal folds reverted
- Cloaca
- Penis/Genital eminence
Methods of Sexing
_ Sexing
- self sexing
- inherent characteristic of a select few breed or strain of chickens
- uses easily observable sex linked characteristics
- requires carrier breeds to introduce sex linked gene
B. Auto Sexing
Methods of Sexing
_ Sexing (1975)
- developed by commercial layer breeds
- uses color or markings
- _ (zz) - predominantly white/light yellow
- _ (zy) - brown/gold/buff
- Color Sexing
- males (zz)
- females (zy)
Color Sexing
_ _ _
- carries a gene for barring (B); incompletely dominant over non-barred gene (b)
- sex of these chicks can be distinguished by the size and shape of a head spot at hatching
- DO _ - large white head spot
- DO _ - smaller and more narrow
Barred Plymouth Rock
- DO males - large white head spot
- DO females - smaller and more narrow
Color Sexing
- _
B=barred; b=non-barred; m=male; f=female
a. crossing bm with Bf
bbm X Bf = Bbm (barred); bf (non-barred
b. in Barred Plymouth Rocks
B is incompletely dominant over b
BBm X Bf
= BBm (barred, large white head spot)
= B (barred, smallw white head spot)
Sex-linked barring
Color Sexing
_ and _ _ or - /
- Gold males X Silver females
- used in broiler and egg industry
- _ - silver
- _ - gold
Silver and Gold genes or Sex-linked gold/silver
- males - silver
- females - gold
Color Sexing
_ _ _ male X _ _ _ female (RIR & BPR)
- _ - black and white barred
- _ - black/red non barred
Rhode Island Red male X Barred Plymouth Rock female
- males - b&w barrred
- females - b/r non barred
Color Sexing
Color sexing of _ _ _ DOC
- _ - larger/more prominent black head line
- _ - smaller/less prominent black head line
Silver Grey Dorking
- female - larger/more prominent black head line
- male - smaller/less prominent
- SGD females larger black head line
Color Sexing
_
Japanese Seattle M (brown) X Japanese Taiwan F (black)
- Japanese Taiwan _ (black)
- Japanese Seattle _ (brown)
Quail
- Japanese Taiwan M (black)
- Japanese Seattle F (brown)
- JT always black, JS always brown
Methods of Sexing
_ Sexing (1969)
- sex of chick is determined by length of wing feathers (primaries and secondaries) at hatching
- _ - slow feathering (K)
- _ - fast feathering (k)
- accuracy and speed is good
- requires training
- feather sexed strains - Hybro and Ross
Feather Sexing
- male - slow feathering
- female - fast feathering
- females are fast feathering
Sexing of Pullet and Cockerel
_ - primary feathers are longer than coverts
_ - primaries are smaller than in the _
Pullet
Cockerel
- pullet longer/thicker yung tips
