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The objective of this research was to investigate the behavioural, physiological and immunological effects of routine surgical procedures in neonatal swine in order to provide producers with science-based recommendations. In the first experiment, low- or average-birth-weight piglets that were tail docked and ear notched at 1 or 3 days of age showed subtle differences resulting from age at processing. However, low-birth-weight male piglets had the lowest attendance during nursing bouts and spent the greatest amount of time lying alone. Vocalization data suggests that ABW piglets may be less reactive to the procedures on d 1. Overall, the decreased vitality and reduced survivability of low-birth-weight piglets suggests that delaying processing until day 3 for these piglets may be preferable. In the second experiment, the effects of docked tail length and nursery stocking density on tail-biting behaviour, skin lesions and rectal prolapses were investigated. Long-tailed pigs (docked to 4.5 cm at birth) were most vulnerable to tail-biting, and housing at a moderate versus high nursery stocking density was not sufficient to reduce tail-biting. High nursery stocking density negatively impacted skin lesion scoring and growth performance for the majority of the grower-finisher period. Pigs from either nursery stocking density and docked tail length groups were equally likely to be affected by prolapsed rectal mucosa. Given the decreased survivability and significantly lighter weaning weight for low-birth-weight piglets compared to those of average-birth-weight, delaying processing of low-birth-weight piglets may be the most humane option. Further, until tail-biting is better understood and a more effective solution found, the routine docking of tails remains the optimal method for balancing a situation with enormous welfare-reducing potential. / Agriculture and Agri-Food Canada

Made available in DSpace on 2016-12-08T16:24:20Z (GMT). No. of bitstreams: 1 PGCA14MA165.pdf: 1074930 bytes, checksum: a1f4cf772486ba3afb04c2d71220f74f (MD5) Previous issue date: 2014-08-08 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / The management used during lactation may interfere with the performance of piglets during lactation and, consequently, in the development of animals in the following phases. With the objective to evaluate omphalitis, arthritis, diarrhea and performance during lactation, 717 piglets from 64 litters were evaluated. At birth, all piglets were placed wearings, individually weighed, dried with hydrated aluminosilicate 100% and separated into four different groups on the same female. In group 1, complete management, the navek was ligation, section and was made antisepsis, after the birth, and was made section on the enf of the tail with subsequente antisepsis on the third day of age. In group 2, without manegement, piglets were not exposed to an umbilical management and were not exposed to tail management. In group 3 (tail docking without antisepsis), the piglets had the umbilical management, the section of the tail without further antisepsis. In group 4 (without umbilical management), the piglets were not submitted to umbilical management and was made tail docking with subsequente antisepsis. At 12 days of age and at weaning, it was found in all animals, the prevalence of omphalitis. At weaning, the healing of the tail, limb lesions and individual weight were also performed. Throughout lactation, mortality and incidence of diarrhea were observed. The data were analyzed using the SAS statistical package previously submitted to the normality of residuals Shapiro-Wilk test and evaluated by logistic regression or the test of χ2. There was not statistical difference between treatments (P> 0.05) for the parameters analyzed, rate mortality, incidence of diarrhea, incidence of omphalitis, arthritis and performance during lactation. In conditions where the experiment was conducted the performance of piglets during lactation were not affected by the management techniques used during lactation / O manejo empregado no período de aleitamento pode interferir no desempenho dos leitões na fase de lactação e, como consequência, no desenvolvimento dos animais nas fases seguintes. Com o objetivo de avaliar onfalites, artrites, diarreia e desempenho de leitões no período de aleitamento, foram avaliados 717 leitões provenientes de 64 leitegadas durante a fase de lactação. Ao nascimento todos os leitões foram brincados, pesados individualmente, secados com aluminosilicato hidratado 100% e separados em quatro diferentes grupos na mesma fêmea. No grupo 1, Manejo Completo, houve ligadura, secção e antissepsia umbilical após o nascimento e secção e antissepsia do terço final da cauda ao terceiro dia de idade. No grupo 2, Sem Manejo, os leitões não foram submetidos ao manejo de ligadura, secção e antissepsia umbilical; bem como de secção e antissepsia do terço final da cauda. No grupo 3 (Sem Antissepsia da Cauda), os leitões tiveram o manejo umbilical, a secção do terço final da cauda sem antissepsia posterior. No grupo 4 (Sem Manejo Umbilical), os leitões não foram submetidos ao manejo umbilical e houve secção e antissepsia do terço final da cauda. Aos 12 dias de idade e ao desmame, verificou-se em todos os animais, a prevalência de onfalite. Ao desmame, a cicatrização da cauda, lesões no aparelho locomotor e pesagem individual também foram realizadas. Ao longo da fase de lactação, a mortalidade e incidência de diarreia foram verificadas. Os dados foram analisados pelo pacote estatístico SAS previamente submetidos ao teste de normalidade dos resíduos Shapiro-Wilk e avaliados sob regressão logística ou pelo teste do χ2. não houve diferença estatística entre os tratamentos (P> 0,05) para os parâmetros analisados, taxa de mortalidade, incidência de diarreia, prevalência de onfalite, artrite e desempenho, durante a fase de lactação. Nas condições onde o experimento foi realizado o desempenho dos leitões no período de aleitamento não foi influenciado pelas técnicas de manejo empregadas durante a fase de lactação