Read the list of symptoms below and see if a problem you are having is shown. If it isn't, try posting your problem on the "Health Forum" on this site and you will get an answer there!

Symptoms	Probable Cause	Corrective Measures
Clear Eggs with no embryonic development (infertiles)	Males undernourished	Follow a recommended feeding program to provide adequate nutrition. Replace underweight males with vigorous ones
	Too few males	Increase the number of males in the flock.
	Seasonal decline in fertility	Use young cockerels more resistant to environmental stress.
	Competition among breeding males	Do not use too many males. Rear all males together. Place temporary partitions within large pens.
	Diseased flock	Conduct an approved disease control program.
	Frozen combs and wattles	Provide comfortable housing. Properly select and maintain drinking fountains.
	Old males	Replace with younger males.
	Selected mating in pens	Artificially inseminate infertile hens. Replace males in the pen/house.
	Male sterility	Replace males in the pen/house.
	Crowded breeders	Provide recommended floor space, at least 3 ft²/bird.
	Improper artificial insemination techniques or use of old/over-diluted semen.	Follow recommendations of primary breeder company.
	Eggs damaged by environment	Gather eggs frequently (at least once daily).
	Eggs stored too long or incorrectly	Store eggs at 50-60 degrees F. and 60% relative humidity. Incubate eggs within 7 days of lay.

Symptoms	Probable Cause	Corrective Measures
Blood rings	Improper storage	Follow recommended egg storage and gathering recommendations.
	Improper incubation temperatures	Check thermometer accuracy and incubator functions. Follow recommended temperature settings.
	Improper breeder nutrition	Feed breeders a diet with balanced nutrient levels.
	Improper fumigation	Follow fumigation recommendations.

Symptoms	Probable Cause	Corrective Measures
Many dead embryos at early stages	Improper incubation temperatures (usually too high)	Follow recommended incubation temperatures.
	Improper egg turning	Turn at least 3 times daily.
	Inherited low hatchability	Avoid cross breeding. May need to secure different breeding stock.
	Improper ventilation	Increase ventilation rate in incubator and/or room, but avoid drafts. Add oxygen at high altitudes.
	Pullorum disease or other salmonelloses	Use eggs from disease-free sources. Have NPIP representatives blood-test the breeder flock.
	Improper nutrition of breeders	Provide a well-balanced nutritional diet to breeders.

Symptoms	Probable Cause	Corrective Measures
Chicks fully formed, but dead without piping	Low average humidity	Maintain recommended humidity for species of bird incubated.
	Improper incubation temperature	Check thermometer accuracy and incubator functions. Follow recommended temperature settings.
	Improper ventilation in incubator	Adjust ventilation to provide optimum moisture-loss rate from egg during incubation.
	Improper turning of eggs	Turn eggs at least three times daily until 3 days prior to hatching.
	Chilling of eggs	Gather eggs frequently and store under proper conditions.
	Diseased or poorly conditioned breeder flock	Conduct a good disease control and breeder management program. Use a well-balanced nutritional diet.

Symptoms	Probable Cause	Corrective Measures
Piped eggs, but died without hatching	Insufficient moisture	Increase humidity (wet-bulb temperature) during the hatching period.
	Improper ventilation	Increase ventilation rate in incubator and/or room, but avoid drafts.
	Improper setting of eggs causing malpositioned embryos	Set eggs with small end down. Turn eggs properly but avoid turning within 3 days of hatching.

Symptoms	Probable Cause	Corrective Measures
Early hatching (may have bloody navels)	High incubation temperatures	Follow recommended incubation temperatures. Check equipment for proper function. Guard against electrical surges or high incubator room temperatures.
	Improper egg storage	Store eggs at 50-60 degrees F. and 60% R.H. Turn at least 3 times daily.

Symptoms	Probable Cause	Corrective Measures
Late hatching or not hatching uniformly	Low incubation temperatures	Follow recommended incubation temperatures.
	Warm and cool spots in incubator due to faulty design	Contact incubator company or obtain a different incubator design.
	Old or improperly stored eggs	Gather eggs frequently, cool immediately and store eggs properly. Do not store longer than 7 days.

Symptoms	Probable Cause	Corrective Measures
Sticky embryos (embryos may be smeared with egg contents)	High average incubation humidity	Follow recommended incubation humidity. Check size of air cell as an indicator for adjusting humidity condition.
	Low incubation temperature	Follow recommended temperature settings.
	Lethal genes	Avoid cross breeding. May need to secure different breeding stock.
	Inadequate ventilation	Increase ventilation rate in incubator and/or room, but avoid drafts.
	Improper fumigation of eggs	Fumigate eggs by following the procedure carefully.

Symptoms	Probable Cause	Corrective Measures
Embryos sticking or adhering to shell	Low incubation humidity (especially during hatching)	Increase incubation humidity by increasing water evaporation. Embryos dried too much.
	Excessive ventilation rate	Reduce ventilation rate but maintain minimum air exchange to prevent suffocation of embryos.

Symptoms	Probable Cause	Corrective Measures
Crippled and malformed chicks	Improper incubation temperatures (usually too high)	Follow recommended incubation temperatures.
	Low incubation humidity	Increase incubation humidity by increasing water evaporation. Embryos dried too much.
	Improper egg setting position or turning during incubation	Set eggs with small ends down. Turn eggs at least 3 times daily. Do not turn eggs within 3 days of hatching.
	Heredity	Proper culling and breeding practices will reduce problems.
	Slick hatching trays	Use trays with wire floors or place crinoline on hatching surface.
	Improper nutrition of breeders	Provide a well-balanced nutritional diet to breeders.

Symptoms	Probable Cause	Corrective Measures
Abnormal, weak, or small chicks	High incubation or hatching temperatures	Follow recommended incubation temperatures.
	Small eggs hatch small chicks	Set only standard or large sized eggs.
	Insufficient incubation humidity	Maintain recommended humidity for species of bird incubated.
	Improper ventilation in hatcher unit	Increase ventilation rate, but avoid drafts.
	Diseased or poorly conditioned breeder flock	Use eggs from disease-free sources only. Have NPIP representatives blood-test the breeder flock.
	Improper nutrition of breeders	Provide a well-balanced nutritional diet to breeders (especially vitamin levels).
	Excessive fumigation in hatcher	Fumigate using proper procedures.

Symptoms	Probable Cause	Corrective Measures
Chicks with labored breathing	Excessive use of fumigant	Follow recommended fumigation procedures.
	Respiratory diseases	Check disease status of breeder flock. Conduct a thorough cleanup and disinfection of incubator and hatching facilities.

Symptoms	Probable Cause	Corrective Measures
Large, soft-bodied mushy chicks; dead on trays; bad odor	Low average incubation temperature	Follow recommended incubation temperatures.
	Poor ventilation	Increase ventilation rate in incubator and/or room, but avoid drafts.
	Navel infection (Omphalitis)	Clean and disinfect incubator and hatching units between settings of eggs. Maintain dry hatching trays. Properly store and fumigate eggs.

Symptoms	Probable Cause	Corrective Measures
Rough or unhealed navels	Improper incubation temperatures	Follow recommended incubation temperatures.
	High hatching humidity	Maintain proper humidity.
	Navel infection (Omphalitis)	Clean and disinfect incubator and hatching units between settings of eggs. Maintain dry hatching trays. Properly store and fumigate eggs.

Symptoms	Probable Cause	Corrective Measures
Short down on chicks	High incubation temperatures	Follow recommended incubation temperatures.
	Low incubation humidity	Follow suggestions to correct insufficient humidity.
	Excessive ventilation	Reduce vent openings to restrict but maintain adequate air exchange.
	Holding chicks in hatcher too long after hatching	Remove all chicks as soon as fluffy but within 24 hours after hatching.

Symptoms	Probable Cause	Corrective Measures
Excessive yellow colouring of down	Improper and excessive fumigation in hatcher unit	Follow recommended fumigation procedures.