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Hatchling length is a potential chick quality parameter in meat type chickens

Published online by Cambridge University Press:  13 December 2013

N. MUKHTAR*
Affiliation:
Department of Poultry Science, Faculty of Veterinary and Animal Sciences, Pir Mehr Ali Shah Arid Agriculture University Rawalpindi-Pakistan
S.H. KHAN
Affiliation:
Poultry Research Institute, Murree Road, Shamsabad, Rawalpindi, Pakistan
M.S. ANJUM
Affiliation:
Department of Poultry Science, Faculty of Veterinary and Animal Sciences, Pir Mehr Ali Shah Arid Agriculture University Rawalpindi-Pakistan
*
Corresponding author: mukhtar.nasir@gmail.com
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Abstract

Like other chick quality parameters, hatchling length is an easy and repeatable quality evaluation parameter for newly hatched chicks. This important trait has a positive correlation with the size of the egg and the chick's weight. The hatchling length is the best indicator of pre-incubation and incubation conditions and for the rate of absorption of yolk after hatching in the body cavity of the chick. Chicks with large lengths have heavier heart weights, liver weights and bursa of Fabricius at hatch. The length at hatch can be measured from the crown to toe and it can be improved by maintaining embryo temperature until internal pipping, proper egg storage conditions, maximum turning of eggs, maintaining the minimum egg weight losses at the 18th day of embryonic development, maintaining ample O2 supply and removal of CO2 through gas exchange programs, improved shell quality and better health of the breeder flock.

The yolk does not play any role in the bird's future growth but it can create many disease problems in the bird's life. A bigger, day-old chick has a large residual yolk and a small yolk-free body mass. This characteristic does not play any role in the development and growth during the incubation and post incubation processes. In conclusion, hatchling length offers a fast, repeatable, and non-destructive method to evaluate chick quality.

Type
Review Article
Copyright
Copyright © World's Poultry Science Association 2013 

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