Comparison of changes in the liveweight and body composition of a newly developed cock line and TETRA-H chicks during the rearing period

The aim of this study was to follow the changes in the liveweight and in the muscle and fat tissue development of 60 chicks originated from a newly developed cock line and from the TETRA-H genotype. Changes in the body composition of these birds were examined by means of computer tomography (CT) in...

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Bibliographic Details
Main Authors: Milisits Gábor
Sütő Zoltán
Donkó Tamás
Orbán Attila
Ujvári Jolán
Pőcze Olga
Repa Imre
Corporate Author: Traditions, innovation, sustainability (2011) (Hódmezővásárhely)
Format: Article
Published: Szegedi Tudományegyetem Mezőgazdasági Kar Szeged 2011
Series:Agrár- és vidékfejlesztési szemle 6 No. 1
Kulcsszavak:Tomográfia, Baromfitenyésztés - brojler
Subjects:
Online Access:http://acta.bibl.u-szeged.hu/76135
Description
Summary:The aim of this study was to follow the changes in the liveweight and in the muscle and fat tissue development of 60 chicks originated from a newly developed cock line and from the TETRA-H genotype. Changes in the body composition of these birds were examined by means of computer tomography (CT) in vivo. CT examinations were performed bi-weekly between 4 and 12 weeks of age. Overlapping 8 mm slice thickness measurements were performed covering the whole body of the chicken using a Siemens Somatom Emotion 6 multislice CT scanner. Using the images obtained so-called muscle and fat indices were calculated by determining the ratio of number of pixels with X-ray density values of muscle or fat to the total number of pixels with density values of muscle, water and fat, i.e. the range between -200 to +200 on the Hounsfield-scale. Based on the results, it was established that the liveweight of the chicks in the newly developed cock line was significantly higher at all examination days than that of the TETRA-H chicks. The difference between the two examined genotypes was more than 1 kg in the case of cocks and almost 1 kg in the case of pullets at 12 weeks of age. The ratio of muscle in the bird’s body was higher, while the ratio of fat lower in the case of the TETRA-H chicks at the end of the experiment in both sexes. Based on the results it was concluded that the use of the new cock line for improving the liveweight and meat production of the TETRA-H chicks can cause unfavourable changes in the body composition of the TETRA-H birds, which should be taken into consideration in the breeding programme of the TETRA-H hybrid in the future.
Physical Description:365-369
ISSN:1788-5345