Tesis doctoral de Sergi Carné Fructuoso
This thesis aimed to evaluate different visual and radio frequency identification (rfid) devices for goats. As current european regulations lay down the official use of visual and rfid ear tags, rumen boluses, and marks on the pastern (injectable transponders and rfid leg bands), these devices were tested in 4 experiments. in exp. 1, application and long-term readability of visual ear tags (v1: tip-tag; v2: official), mini-boluses (b1: 13.8 g; and b2: 20 g), rfid ear tags (e1: flag-button; e2: double button), and injects on the fore-hind pastern (t1: 15 mm; t2: 12 mm) in replacement murciano-granadina dairy goat kids (n = 97) were tested; standard-sized boluses (b3: 75 g) were evaluated as control devices in their mothers (n = 29). At 1 yr of age, readability of b3, e1 and e2 was 100%. Lower readabilities corresponded to b1 (71.4%), v1 (82.9%), b2 (84.6%), and t1 (92%). At 3 yr of age, only e1 was 100% readable; readability of the rest of devices ranged from 69.6 to 96.4%. In conclusion, button rfid ear tags offered the best results for id of dairy goats at early age. in exp. 2, a total of 295 adult and yearling goats from alpine, angora, boer, and spanish breeds, and managed under semi-extensive conditions, were used. Influence of management system and breed effects on the retention of 3 bolus types (b1: 20 g, n = 95; b2: 75 g, n = 100; and b3: 82 g, n = 100) and 1 visual ear tag were investigated. Effect of feeding management on early losses (mo 1) was evaluated by measuring ruminal ph. No early losses occurred, although ruminal ph varied by goat breed and feeding management (6.32 to 6.73). At 1 yr, bolus retention (98.1%) was greater than ear tag (91.7%). Lowest bolus retention was for b1 (96.3%), whereas it was 97.8% for b3, and 100% for b2. Ear tag retention varied between breeds (82.9 to 98.6%). In conclusion, standard-sized boluses offered suitable long-term retention for goats under semi-extensive conditions. in exp. 3, adult murciano-granadina goats (n = 220) were identified with visual ear tags (ve), rumen boluses (rb: 75 g), rfid ear tags (ee, n = 47), and leg tags (lt) with 2 types of button transponders (et1, n = 90; et2, n = 130). Long-term readability was evaluated. According to shank circumference, lt for kid id was discarded and only adult does were used. At 1 yr, no losses of lt occurred, although 1.5% were removed due to limping; readability of rb, ee, ve, et1, and et2 was 96.5, 95.7, 97, 93.9, and 98.3%, respectively. Greater dynamic reading efficiency dre for rb (95.2%) and lt (92.4%) were obtained with the antenna to the left and on the floor, respectively. In conclusion, adequately designed leg tags are a valid id method for adult dairy goats. in exp. 4, 2,482 rfid rumen boluses from 19 bolus types were used to construct a regression model of bolus retention in goats. Bolus features varied in length (37 to 84 mm), o.D. (9 to 22 mm), weight (w, 5 to 111 g), volume (v, 2.5 to 26 ml), and specific gravity (sg, 1 to 5.5). Bolus retention varied (0 to 100%) according to bolus features. A logit regression model with w and v as covariates was constructed (r2 = 0.98). Estimated w and sg to produce mini- (5 ml), medium- (15 ml) and standard-sized (22 ml) boluses for a retention rate of 99.95% were 42.9, 73.0, and 94.1 g, and 8.58, 4.87, and 4.28, respectively. Increasing bolus w and sg allowed v to be reduced. Suitable medium-sized rfid boluses for goats can be produced with radio translucent materials currently available. in conclusion, visual ear tags and injects in the pastern are not recommended. Button electronic ear tags showed variable results, and electronic leg tags were a valid method for adult goats. A regression model of bolus retention was established, concluding that medium-sized boluses may be effectively produced for goat id. Small-sized boluses are not recommended.
Datos académicos de la tesis doctoral «Electronic identification of goats: comparison of different types of visual and radio-frequency devices«
- Título de la tesis: Electronic identification of goats: comparison of different types of visual and radio-frequency devices
- Autor: Sergi Carné Fructuoso
- Universidad: Autónoma de barcelona
- Fecha de lectura de la tesis: 14/05/2010
Dirección y tribunal
- Director de la tesis
- Gerardo Caja López
- Tribunal
- Presidente del tribunal: xavier Such marti
- anastasio Arguello henríquez (vocal)
- (vocal)
- (vocal)