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Title: Interrelationships between chick quality parameters and the effect of individual parameter on broiler relative growth to 7 days of age
Authors: Tona, Kokou ×
Onagbesan, Okanlawon
De Ketelaere, Bart
Bruggeman, Veerle
Decuypere, Eddy #
Issue Date: Apr-2005
Publisher: Eugen ulmer gmbh co
Series Title: Archiv fur geflugelkunde vol:69 issue:2 pages:67-72
Abstract: In a previous report, day-old chick quality was defined to incorporate physical qualitative parameters and that chick quality, as distinct from hatching weight, influenced the relative growth (RG) of the broiler to 7 or 42 d of age. These quality parameters were based on information collected from hatcheries and broiler farms. The scoring system was related to the importance of the parameter to the survival of the chick and severity of the abnormality. The current study evaluated the level of occurrence of abnormality of each parameter in newly hatched day-old chicks as a method of ascertaining their importance in determining the quality of chicks in a flock. The study also determined the interrelationships between parameters to check the possibility of correlated responses and to ascertain the individual effect each parameter may have on RG. This is with a view to reviewing the quality parameters included in the assessment of chick quality and the scoring system. A total of 10800 eggs from Cobb broiler breeders were incubated and all the chicks hatched were weighed individually and scored for quality parameters. The chicks were reared until 7 d of age and weighed again. The data collected were analyzed to determine the number of chicks with or without abnormality in each of the parameters and any correlations between them. Body weights were used to calculate RG. The results show a low but positive correlation (0.33) between RG and quality score. The major cause of lower than maximum quality score was attributable to abnormality of the navel area. Activity, remaining membrane, retracted yolk, down and appearance, also ranked high but lower than navel abnormality. Abnormality of the legs, eyes and residual yolk were very low suggesting that they may not be of great importance. The data also revealed significant correlations between quality parameters especially those abnormalities with high occurrence suggesting that the occurrence of one may always be associated with the other. The individual effect of qualitative parameters was reflected in day-old weights and RG. Again, those abnormalities with high occurrence and correlation caused significant lowering of RG. Leg abnormality or residual yolk had no effects. It is concluded, in view of these result, that parameters included in the assessment of chick quality and scoring may need to be revised.
URI: 
ISSN: 0003-9098
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Division of Livestock-Nutrition-Quality (-)
Division of Mechatronics, Biostatistics and Sensors (MeBioS)
× corresponding author
# (joint) last author

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