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.: Home > Animal Science Papers and Reports > 2007 > Volume 25 Number 3 > Emilia Mrَz, Katarzyna Michalak, Aneta Or³owska

Embryo mortality and poult quality depend on the shell structure of turkey hatching eggs

Emilia Mrَz, Katarzyna Michalak, Aneta Or³owska
Department of Poultry Science, Faculty of Animal Bioengineering, University of Warmia and Mazury in Olsztyn, Micha³a Oczapowskiego 5, 10-719 Olsztyn, Poland
Abstract :

An investigation was conducted between 7 and 12 weeks of the laying season, on hatching eggs of heavy-type turkeys, differing in shell surface characteristics (eggs with good quality shells, roughshelled eggs and eggs without shell surface pigmentation). Six incubation series were carried out. The percentage of eggs containing dead embryos was determined on consecutive days of incubation and the percentage of eggs containing living unhatched embryos was determined on day 28 of incubation. Moreover, peaks of embryo mortality and periods of increased embryo mortality rates, as well as the hatching rate of fertilized eggs were also established. The weight and body conformation of poults were determined after incubation, on an individual basis. Peaks of embryo mortality were observed on day 3 in the group of eggs with rough shells and on day 24 in the group of eggs with shells of normal quality. Increased embryo mortality rates were recorded in all groups of eggs between day 2 and 5 and between day 23 and 25 of incubation, as well as on day 8 in the group of eggs without shell surface pigmentation. After 2 and 3 weeks of incubation, embryo mortality rates in the groups of eggs with rough shells and eggs without shell pigmentation were higher by 7.5 and 18.5%, respectively, in comparison to the group of eggs with normal quality shells (8.0%) The highest hatching rate (92.54%) was noted in the group of eggs with shells of good quality. Differences in egg weight had a significant effect (P.0.01) on poult weight, which ranged from 62.6 g in the groups of eggs with normal quality and rough shells to 60.8 g in the group of eggs
without shell surface pigmentation. Poults that hatched from eggs with shells of good quality had lower relative body weight (68.30 vs. 68.67 and 69.45%, P.0.01). The most poults (P.0.01) with anatomical abnormalities hatched from eggs without shell surface pigmentation while the fewest . from eggs with good quality shells (71.65 vs 45.25%). Poults with anatomical abnormalities of the umbilicus and plumage dominated among birds with physical defects. The relationship between eggshell structure characteristics and physical defects of poults was not confirmed statistically.

Keywords :
eggshell / embryo mortality / poult quality / turkey

Date Deposited : 08 Aug 2011 12:32

Last Modified : 08 Aug 2011 12:32

Official URL: http://www.ighz.edu.pl/

Volume 25, Number 3, - 2007

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