dir. (Universitat Autònoma de Barcelona. Departament de Ciència Animal i dels Aliments)
dir.
Publicació: |
[Barcelona] : Universitat Autònoma de Barcelona, 2011 |
Descripció: |
1 recurs electrònic (147 p.) |
Resum: |
El objetivo de esta tesis fue evaluar la trazabilidad de corderos utilizando dispositivos visuales (crotales oficiales y no oficiales) y electrónicos (mini-bolos e inyectables subcutáneos en la axila) de identificación (ID), así como su verificación por medio de imágenes retinales. Para ello se realizaron 4 experiencias (994 corderos), en distintas condiciones de granja y de matadero. 0,05), aunque disminuyó a 78,8% en matadero con los IT. Se detectó un cambio de orden de las canales en el pesaje, reduciendo la trazabilidad en la línea a 68,3%. El valor de MS de las retinas disminuyó al sacrificio, pero el porcentaje de imágenes con MS ≥ 70 mejoró al invertir las cabezas (56,4 vs. 75,0%; P 0,05). La Exp. 3. 2 se realizó en un cebadero cooperativo y un matadero de grandes dimensiones. Los corderos (n = 308) se identificaron con crotales 'Tip-tag' (V3) e IT, y se tomaron imágenes retinales de ambos ojos (n = 153) para verificar su ID. La trazabilidad en granja fue menor con V3 que con IT (87,5% vs. 95,1%; P 0,05), y los IT sólo trazaron el 64,1% de las canales. El orden de las canales se mantuvo a pesar de la velocidad de la línea. La imagen retinal permitió verificar la ID del 70% de los ojos en matadero. En conclusión, V1, V2 y MB resultaron adecuados para la trazabilidad individual de corderos vivos, pero no para sus canales. Es posible implementar un sistema automático de trazabilidad individual en granja y matadero si se utilizan dispositivos electrónicos y se asegura el orden de las canales. Asimismo, la imagen retinal puede permitir la verificación de la ID de corderos en muestras aleatorias y para trazar canales de consumo étnico (halal y kosher). |
Resum: |
The aim of this thesis was to evaluate lamb traceability by means of visual (official and non-official ear tags) and electronic (mini-boluses and injects in the armpit) identification (ID) devices. Retinal images (RI) were used for traceability verification. For this purpose, 4 experiments (994 lambs) under different farm and slaughterhouse conditions were carried out. In Exp. 1, an Optireader device (Optibtand, Fort Collins, CO, USA) was used to set up an ID method based on retinal images in lambs. Images were taken at 3 (n = 152), 6 (n = 58), and 12 (n = 58) mo of age. Intra- and inter-age comparisons were done to obtain the matching score (MS, 0 to 100) of pairs of RI from the same eye. The 3-mo retinal images were used as reference images to assess operator training and to determine the matching threshold. Results obtained showed that suitable operator training was achieved after 6 sessions (264 images), and the best sensitivity (0. 989) and specificity (0. 995) was obtained when MS ≥ 70. The average values of intra- and inter-age MS were 96. 3 ± 0. 3 and 92. 6 ± 0. 5, respectively. In contrast to 3-mo results, all MS at 6 and 12 mo were ≥ 70, resulting in 100% verification of lamb ID. In Exp. 2, the optimal age at which retinal images with an Optireader device could be used as reference was assessed. A total of 143 lambs from 1 d until 1 yr of age were used, and 4 Spanish commercial categories were studied: milk-fed lambs (n = 136), fattened light lambs (n = 134), recruited replacement lambs (n = 59), and yearling replacement lambs (n = 25). The MS values and percentage of images with MS ≥ 70 increased with lamb age from d 1 (81. 0 ± 1. 0 and 75. 8%) to 82 (95. 9 ± 0. 4 and 100%), respectively (P 0. 05). Consequently, the retinal images taken at 8 d showed better results than those taken at 1 d of age (94. 8 vs. 87. 4%; P 0. 05) in milk-fed lambs. In fattened light lambs, 30-d retinal images were better than those at 8 d of age (99. 6 vs. 93. 6%; P 0. 05), but only reached 78. 8% at slaughter with IT. Change of carcass order was detected at weighing, and slaughtering line traceability was reduced to 68. 3%. The MS value of the retinal images decreased in slaughtered lambs, but the percentage of images with MS ≥ 70 increased with heads reversed (56. 4 vs. 75. 0%; P 0. 05). The Exp. 3. 2 was carried out in a feedlot cooperative and at a high throughput slaughterhouse. Lambs (n = 308) were identified with 'Tip-tag' ear tags (V3) and IT. Retinal images of both eyes (n = 153) were also taken to verify lamb ID. On-farm traceability was lower with V3 than IT (87. 5% vs. 95. 1%; P 0. 05), but only 64. 1% carcasses were traced with IT. Despite the high throughput, carcass order was maintained (100%). Retinal images verified the ID of 70. 0% of eyes. In conclusion, V1, V2 and MB were suitable for individual live lamb traceability but not for their carcasses. However, an automated individual traceability system could be effectively implemented in farm and slaughterhouse if electronic devices were used and the carcass order maintained in the slaughterhouse. Retinal image may also be suitable to verify the lamb ID in random samples and to trace carcasses for the ethnic meat (e. g. , halal and kosher). |
Nota: |
Tesi doctoral - Universitat Autònoma de Barcelona. Departament de Ciència Animal i dels Aliments, 2011 |
Drets: |
ADVERTIMENT. L'accés als continguts d'aquesta tesi doctoral i la seva utilització ha de respectar els drets de la persona autora. Pot ser utilitzada per a consulta o estudi personal, així com en activitats o materials d'investigació i docència en els termes establerts a l'art. 32 del Text Refós de la Llei de Propietat Intel·lectual (RDL 1/1996). Per altres utilitzacions es requereix l'autorització prèvia i expressa de la persona autora. En qualsevol cas, en la utilització dels seus continguts caldrà indicar de forma clara el nom i cognoms de la persona autora i el títol de la tesi doctoral. No s'autoritza la seva reproducció o altres formes d'explotació efectuades amb finalitats de lucre ni la seva comunicació pública des d'un lloc aliè al servei TDX. Tampoc s'autoritza la presentació del seu contingut en una finestra o marc aliè a TDX (framing). Aquesta reserva de drets afecta tant als continguts de la tesi com als seus resums i índexs. |
Llengua: |
Castellà |
Document: |
Tesi doctoral ; Versió publicada |
Matèria: |
Tratabilidad ;
Identificación ;
Biometría |
ISBN: |
9788469423806 |