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.: Home > Animal Science Papers and Reports > 2009 > Volume 27 Number 3 > Emilia Mrَz*, Aneta Or³owska

Quality of heavy-type turkey poults as related to the age of layers in the first laying season

Emilia Mrَz*, Aneta Or³owska
Department of Poultry Science, Faculty of Animal Bioengineering, University of Warmia and Mazury in Olsztyn Oczapowskiego 5, 10-719 Olsztyn, Poland
Abstract :

During the first 24-week laying season nine incubation series (504 eggs in each) were carried out at
three-week intervals. Major hatchability determinants were considered and assessed on 4536 eggs.
Moreover, the body conformation of 3688 poults was evaluated based on motor activity, outward
appearance of down, abdomen, eyes, legs and navel, and on the residues of the chorioallantoic
membrane and the yolk sac. The scores for the overall quality of poults were expressed in a 100-
point scale. Moreover, determined was body weight (g) and relative body weight (%) of poults.
The results were evaluated statistically by a one-factorial analysis of variance. Mean values were
compared by Duncan test.
Hatching rate ranged from 75.6% to 93.1%, and was lowest in turkey-hens aged 33 and 57 weeks.
The body weight of poults increased from 59.1 g to 72.6 g over the laying season, reaching 63.4 to
71.0 g at peak hatchability. At that time the relative body weight of poults varied from 67.2 to 70.2%.
Poults from eggs laid by hens aged 39 to 51 weeks reached the highest mean scores for quality – 95.2
to 96.8 points. The quality of poults hatched from eggs laid by hens aged 33, 36, 54 and 57 weeks
was found to be significantly poorer.

Keywords :
body weight / conformation / hatchability / poults / turkey

Date Deposited : 05 Aug 2011 10:19

Last Modified : 05 Aug 2011 10:19

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Volume 27, Number 3, - 2009

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