10 Dec 2020

Discarded chicks: Source of information to improve hatching performance

Content available in: Español (Spanish)

  • Birds discarded at hatch due to physical abnormalities are a very important source of information in hatchery management, since increases of such cases are due to failures or inadequacies in the incubation profiles.

This article describes some physical abnormalities and the reasons why they occur.

BIRDS WITH OPEN, TWISTED OR SHORT LEGS

This is one of the most common physical abnormalities. High embryonic temperatures (101-102 ° F) and poor ventilation affect normal embryonic leg formation. If the percentage exceeds “normal” check the temperature of the eggs in the last days in both incubators and hatchers. Avoid smooth surfaces where birds have to stand (ex: hatcher trays). Nutritional deficiencies in the parent stock can also contribute, such as: biotin, manganese, choline, nicotinic acid, pyridoxine, folic acid.

birds discarded in incubators

SWOLLEN JOINTS (RED HOCKS)

discarded birds

This phenomenon is very frequent in seasons of high humidity. Check the weight loss of the eggs upon transfer. Percentages less than 9% generate small air chambers that make it difficult for the birds to get out, generating lacerations and injuries from their excessive efforts.

Very high temperatures in hatchers can also stimulate the birds to rush out of the eggs faster, thus injuring themselves in the process.

discarded birds

CHICKS WITH BLACK NAVELS (SCABS)

discarded birds

The high temperature and lack of ventilation accelerates embryonic development, interfering with the total absorption of the yolk sac when the navel is being sealed. The small outer remnant transforms into a black scab. Check the temperature of the shell, it should be between 99.4-100 ° F.

LONG UMBILICAL CORDS

In nature, the hens stand up once the chicks hatch, thus allowing air circulation to dry off the cords, which then become fragile and fall off. In hatcheries, high humidity levels in hatchers interfere with the normal drying process.

discarded birds

 

UNHEALED NAVELS

This abnormality is mostly noticed in chicks with wet plumage. In this case, the total incubation time was very short or the incubation temperature was extremely low. Check the hatch window and shell temperature. Also very high humidity in hatchers interferes with normal sealing of the navels.

discarded birds




 

MAGAZINE

 


See other editions


Logo Ceva
 

Register to our International Newsletter

Get full access to our digital magazines and newsletters filled with contents by experts.



logo

Agrinews communication group

Privacy Policy
Cookies Policy