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Assessment of the body development kinetic of broiler breeders by non-invasive imaging tools
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Edité par CCSD ; Poultry Science Association -
International audience. In order to determine the body compo-sition of parental broilers during growth from hatch-ing to adulthood (32 wk of age), we evaluated thekinetics of fattening, growth rate, reproduction param-eters, and body composition of the animals by usingnon-invasive tools such as medical imaging (ultrasoundand CT scan) and blood sample analysis. The use ofCT scanner allowed us to monitor the development ofthe body composition (fatness, bone, muscle, ovary, andtestis growth) of these same animals. These analyseswere accompanied by biochemical blood analyses suchas steroids, metabolites, and some adipokines concen-tration. Difference in the body composition betweenmales and females appeared at 16 wk of age. From20 wk of age, shortly before the onset of lay, the fe-males had 1.6-fold more adipose tissues than males(P<0.001) and 8-fold more elevated plasma triglyc-erides levels. In addition, females, from 16 wk of age,presented a weakened bone quality in comparison tomales (P<0.001). The ratio of the tibia volume/tibialength was 33.2% lower in female compared to malechicken at 32 wk of age (P<0.001). However, the pec-toral muscle had the same volume in both sexes. Theproduction of steroids by gonad started at 16 wk ofage for both sexes, and the testis and ovary develop-ment could be measured by imaging tools at 24 wk.The follicle development was correlated to the ovarianfat tissue (r = 0.80) and fatness. In conclusion, the useof CT scanner and ultrasound system has allowed inves-tigate the body composition of live animals and actualparental breeds with to the aim of using them for ge-netic selection
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