Resumen de Eficacia de lectura dinámica de transpondedores de distintas tecnologías en ganado ovino en condiciones de granja
Adel Ait Saidi, Gerardo Caja López, J.H. Mocket
A total of 240 ewes, identified with electronic ear-tags and boluses of half-duplex and full-duplex B technologies, were used for studying the dynamic reading performances under on-farm conditions in sheep. Two optimized stationary transceivers of different features were used in a 50 cm management race-way. Ewes were separated in 4 groups according to identification device type and the dynamic readings performed in quintuplicate in unique or mixed groups. Sheep speed in front of the reader’s antenna was 0.8 m/s (0.5-1.1). Reading efficiency varied between 25.3 and 100%, with small differences by reader and dramatic differences between devices. The greatest reading efficiency values were obtained with HDX boluses read single or mixed with HDX ear tags. For mixed readings no differences between HDX boluses and ear tags were found. On the contrary, FDX-B boluses showed the lower reading efficiency when read single or mixed with other devices in the case of one of the readers. Reading differences between technologies were smaller when HDX and FDX-B ear tags were compared. Although HDX devices were read satisfactorily in most cases and are recommended as the most convenient tool for applications (i.e., automated milk recording), we proposed to use double tagging with a second HDX ear tag (non-official) when observed reading problems in sheep populations that used mixed technologies.
