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Stress responses in lambs castrated with three different methods

Bonelli, Piero and Dimauro, Corrado and Pau, Salvatore and Dattena, Maria and Mollica, Alessandra and Nicolussi, Paola (2008) Stress responses in lambs castrated with three different methods. Italian Journal of Animal Science, Vol. 7 (2), p. 207-217. ISSN 1828-051X. Article.

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Abstract

The present work was conducted to evaluate the animal response to stress in lambs caused by three different castration techniques. Forty-six male lambs aged 4-5 months were randomly allocated to one of four groups including Burdizzo (B), scrotal ablation (SA), orchiectomy (OR) and control handling (H). Local anaesthesia (lidocaine 2%) was administered in both spermatic cords and the scrotal neck of lambs before each treatment. Blood samples were collected at -30, -10, +1, +20, +40, +60, +120, and +180 minutes. Serum cortisol concentrations were determined using a competitive immunoassay and the area under the curve (AUC) was calculated for each lamb. The following biochemical parameters were assayed for each animal at each time point: alanine aminotransferase (ALT), aspartate aminotransferase (AST), lactate dehydrogenase (LDH), creatine kinase (CK) and glucose (GLU). The time needed for total lesion resolution and weight gain of each animal was recorded. Orchiectomy elicits the greatest cortisol response, significantly greater than that seen in similarly handled controls (P≤0.01), Burdizzo and scrotal ablation groups (P≤0.05). The serum cortisol AUC was higher in the scrotal ablation group (P≤0.05) than controls, but lower than in the orchiectomy group (P≤0.05). The Burdizzo group didn’t differ from controls. Serum glucose levels of the castrated lambs differed significantly from the control group, following a trend similar to cortisol. No change was seen in ALT, AST, LDH or CK. No difference in weight gain was seen among the groups. Our results suggest that use of the Burdizzo is the preferable castration technique for adult lambs, while scrotal ablation is a valid surgical alternative to orchiectomy and permits more rapid wound healing that is ideal for extensive management where flocks are not under close observation.

Item Type:Article
ID Code:3047
Status:Published
Refereed:Yes
Uncontrolled Keywords:Stress, cortisol, castration, lambs, animal welfare
Subjects:Area 07 - Scienze agrarie e veterinarie > VET/10 Clinica ostetrica e ginecologia veterinaria
Area 07 - Scienze agrarie e veterinarie > AGR/19 Zootecnica speciale
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze zootecniche
002 Altri enti e centri di ricerca del Nord Sardegna > Istituto zooprofilattico sperimentale della Sardegna, Sassari
001 Università di Sassari > 01 Dipartimenti > Patologia e clinica veterinaria
002 Altri enti e centri di ricerca del Nord Sardegna > AGRIS Sardegna, Olmedo > Dipartimento per la ricerca nelle produzioni animali
Publisher:Avenue media on behalf of Scientific Association of Animal Production (ASPA)
ISSN:1828-051X
Publisher Policy:Depositato per gentile concessione dell'ASPA
Deposited On:22 Sep 2009 11:56

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