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Welfare and performance of piglets raised in system wean to finish

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Brenda Batista Lemos Medeiros
Total Authors: 1
Document type: Doctoral Thesis
Press: Campinas, SP.
Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Agrícola
Defense date:
Examining board members:
Daniella Jorge de Moura; Fabiana Ribeiro Caldara; Kesia Oliveira da Silva; Yamilia Barrios Tolon; Danilo Florentino Pereira
Advisor: Daniella Jorge de Moura

The "wean to finish" system is a new way to raise piglets in Brazil. Studies about ideal group size or ideal stocking density for raising these animals in the same building are rarely seen in the literature. Nothing is known about the size of the piglets group or ideal densities to raise the piglets in relation to their performance and welfare. This study has the objective to evaluate the welfare and performance of piglets raised in system wean to finish in different group and in different raising phases. The treatments consist of different number of animals and space allowance per pig: T1 = 22 animals (1.12 m2/pig), T2= 24 animals (1.02 m2/pig), T3= 26 animals (0.94 m2/pig) T4= 28 animals (0.88 m2/pig) e T5= 30 animals (0.82 m2/pig). The environmental variables of the buildings and outside them were evaluated such as: temperature, relative humidity and air velocity the THI index was calculated. The NH3 and CO2 were collected. The geostatistics technique was used to study the homogeneity of the environmental conditions. The sound pressure of the buildings was also evaluated, such as the behavior of the piglets, the surfaces temperatures, the cortisol salivar levels, the health status of the piglets (index coughing and sneezing and consistency of stool), respiratory frequency, frequency of skin injuries and their performance (initial and final weight, weight gain and feed conversion). The treatments was assigned in a completely randomized experimental design, a Tukey test (P <0.05) was performing for means comparison of each treatment using a statistical software for analysis (SAEG). For non-parametric analysis was used Kruskall - Wallis test (P <0.05) and the analysis was performed in the statistical software Minitab 15. The results of temperature and relative humidity of the air were within the expected data by the literature recommendations, in all phases of the piglets. The air velocity and the gases concentration showed an heterogeneous pattern in standard statistics results and in geostatistics, as expected in natural ventilated buildings. The sound pressure levels in all treatments and studied phases were below the recommended by the literature, 85 dB (A). For pig behavioral analysis, pigs spent more time rooting and lying down during phase 1. Lying down was also more frequent during phase 4. Analyzing the piglets behavior, it was observed that some behaviors showed up in a greater frequency depend on the piglet's age. The skin surface temperature and the health status were within the limits recommended by the literature. The results also showed that the best results were obtained in treatment 5, the group of the higher number of animals. Was concluded that all the treatments had the same welfare status, but the higher number of animals presented the best results of performance (AU)

Grantee:Brenda Batista Lemos Medeiros
Support Opportunities: Scholarships in Brazil - Doctorate