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 Incubation fault & checklist

Problem :Too many clears or infertile eggs

Probable causes Action
(a)wrong proportion of males to females
(b)Male is undernourished
(c) Interference among during mating
(d)Damaged combs and wattles among males
(e) Male is too old
(f) Male is sterile
(g) Eggs kept too long or under the wrong conditions before setting
(a)Check mating ratios according to breeder's recommendations
(b)See that cockerels are able to feed separately, otherwise hens may eat all the feed
(c) Do not use too many males; always rear breeding males together; erect temporary solid partitions between breeding pens or inside large pens
(d)See that housing is comfortable and proper drinking fountains are provided for breeding pens
(e) Replace old birds
(f) Replace with another male
(g) Do not keep hatching eggs longer than seven days; store them in a cooltemperature(10-15.6°c)at relative humidity around 75-80%

Problem :Blood rings which indicate very early embryonic death

Probable causes Action
(a) Incubator temperature too high low
(b) Incorrect fumigation procedure
(c) As in 1(g)
(a) Check thermometers, thermostats and electricity supply; fallow manufacturer's instructions
(b) Use the correct amount of fumigant. Do not fumigate between 24 and 96 hours after setting
(c) As in 1(g)

Problem : Many dead-in-shell

Probable causes Action
(a) As in 2(a)
(b) Eggs not properly turned
(c) Breeding stocks' nutrition is deficient if deaths are high in days 10 and14
(d) Incubator's ventilation faulty
(e) Infectious diseases
(a) As in 2(a)
(b) Turn the eggs regularly at least three to five times a day; always turn the eggs in the reverse direction each time
(c) check that feeding is sound
(d) Increase ventilation by normal means
(e) Use eggs only from healthy stock; check that hatchery hygiene is sound and carried out regularly

Problem : Piped eggs failing to hatch

Probable causes Action
(a) Insufficient moisture in the incubator
(b) Too much moisture at earlier stages
(c) Nutrition problem
(a) Increase the evaporating surface of water or the sprays
(b) check wet- bulb readings
(c) check flock feeding

Problem : (a) Hatching too soon
(b) Hatching too late
(c) Sticky chicks

Probable causes Action
(a) Incubator's temperature too high
(b) Incubator's temperature too low
(c) Incubator's temperature probably too high
(a) (b) (c) Ensure the temperature regulating gear is working and set at the correct operating temperature when the control switches off

Problem : Malformed chicks

Probable causes Action
(a) Incubator's temperature too high
(b) Incubator's temperature too low
(c) Eggs set incorrectly or not properly turned after setting
(a)As in2(a)
(b) As in2(a)
(c) As in3(b); also ,take care to set the eggs broad –end up;

Problem : Spraddling chicks

Probable causes Action
Hatching trays too smooth Use wire-meshed tray floors or cover slippery floors with burlap or other similar material

Problem : Weak chick - Small chick
Heavy breathing chicks
Mushy chicks

Probable causes Action
(a)Incubator or hatching unit overheating
(b) Setting smalleggs
(c) Too little moisture in incubator
(d) Too much fumigant left in hatcher
(e)Too much moisture in hatcher
(f) Possibly infectious disease
(g) Low average temperature during period of incubation
(h) Incubator has poor ventilation
(i) As in 3(d)
(a) As in 5
(b)Only set eggs of the breed average size
(c) As in 4
(d) As in 2(a)
(e) As in 4
(f) Send chicks to a veterinary laboratory for diagnosis
(g) As in 2(a)
(h) Omphalitis (navel infection)
(i)Carefully clean out and fumigate the incubator using formaldehyde at the higher strength; disinfect all equipment;

Problem : Hatch not coming off evenly

Probable causes Action
Setting eggs too diverse in or size Set eggs at least once a week and never retain hatching eggs longer than 10 days before setting; incubate only average-size eggs