Percorrer por autor "Dias-da-Silva, A."
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- Development of a rapid and simple approach for kid carcass evaluation by vídeo image analysis.Publication . Monteiro, A.; Teixeira, Alfredo; Azevedo, Jorge; Lourenço, Ana Luísa; Dias-da-Silva, A.; Silva, S.R.objective of this work is the development of a simple and cost-effective video image analysis (VIA) system to evaluate kid carcass in small slaughter units. To achieve this objective a trial was conducted with 42 kid carcasses (6.6±2.6 kg) and models to predict carcass composition from VIA were established. While the carcasses were hanging in the gambrel an image of the dorsal view of each carcass was obtained with a digital camera (Sony, DCR-TRV460). For imaging, carcasses were placed in front of a non-glare black surface and illuminated with standard lighting. The camera was placed perpendicular to the carcass long axis. A total of 44 geometric measurements (linear and area) were obtained after carcass image analysis with the ImageJ 1.39J software.
- Sheep whole body composition predicted by in vivo real time ultrasound measurementsPublication . Silva, Severiano; Gomes, Maria José Marques; Teixeira, Alfredo; Guedes, Cristina M.; Santos, V.A.; Azevedo, J.M.T.; Dias-da-Silva, A.Accurate measurement of changes in body composition and in the energy content of live animals is crucial to understand the responses to the intake of nutrients. Despite the accuracy of the serial slaughter technique in determining body composition, it is very expensive and comparisons within an animal became impossible thus the need for an accurate method to predict body composition in the live animal is obvious for the biological efficiency studies. This work aimed to establish equations to estimate in vivo whole empty body chemical composition of sheep using real time ultrasound CRTU) measurements.