Navegando por Autor "Gomes, Nicoly F."

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    PERFORMANCE AND WELFARE OF FINISHING PIGS SUBJECTED TO CLIMATECONTROLLED ENVIRONMENTS AND SUPPLEMENTARY LIGHTING
    (2020) Barnabé, Janice M. C.; Pandorfi, Héliton; Gomes, Nicoly F.; Ameida, Gledson L. P. de; Guiselini, Cristiane
    ABSTRACT An adequate thermal environment in pig farming facilities is essential to ensure productivity and animal welfare. The objective of this study was to evaluate the behavior and performance of finishing pigs, subjected to climate-controlled environments and supplementary lighting. Twenty-seven pigs (3/4 Duroc, 1/4 Pietrain) were kept in pens with no climate control, pens with forced ventilation and pens with adiabatic evaporative cooling system, associated with 12 h of natural light, 12 h of natural light + 4 h of artificial light and 12 h of natural light + 6 h of artificial light. The experimental design was completely randomized, in a 3x3 factorial arrangement and the means were compared by Tukey test (p<0.05). Meteorological variables, temperature and relative humidity, were recorded and the zootechnical performance of the animals was evaluated by weight gain, feed intake and feed conversion. Behavioral analysis was performed using the frequency of ingestive and comfort behaviors (exploratory activities and social interactions). Better performance was found for animals subjected to evaporative cooling, and the program with supplementary lighting for 6 hours promoted better feed conversion. Pigs subjected to evaporative cooling showed higher frequency of comfort behaviors and higher frequency of ingestive activity, stimulated by better thermal conditions in the housing.
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    Performance of growing pigs subjected to lighting programs in climate-controlled environments
    (2020) Barnabé, Janice M. C.; Pandorfi, Héliton; Gomes, Nicoly F.; Holanda, Marco A. C.; Holanda, Mônica C. R.; Carvalho Filho, José L. S.
    ABSTRACT The objective of this research was to evaluate the thermal comfort, physiological responses and performance of pigs in the growth phase, subjected to supplemental lighting programs in air-conditioned environments, in semiarid region of Pernambuco state, Brazil. Twenty-seven pigs (3/4 Duroc, ¼ Pietrain) were subjected to pens with no climate control, pens with forced ventilation and pens with adiabatic evaporative cooling, associated with 12 h of natural light, 12 h of natural light + 4 h of artificial light and 12 h of natural light + 6 h of artificial light. The experimental design was completely randomized, in a 3 x 3 factorial arrangement with three repetitions. Meteorological responses, physiological responses and performance variables of the animals were recorded. The evaporative cooling system attenuated the action of the stressors and ensured adequate thermal conditions for the animals. Respiratory rate and rectal temperature indicated that evaporative cooling ensured the maintenance of homeothermy. Weight gain and feed conversion were positively influenced for the animals exposed to evaporative cooling, but without significant effect of lighting programs. RESUMO O objetivo desta pesquisa foi avaliar o conforto térmico, as respostas fisiológicas e o desempenho de porcos na fase de crescimento, submetidos a programas complementares de iluminação em ambientes climatizados, na região semiárida de Pernambuco, Brasil. Vinte e sete porcos (3/4 Duroc, ¼ Pietrain) foram submetidos a baias sem ar condicionado, baias com ventilação forçada e baias com resfriamento adiabático evaporativo, associadas a 12 h de luz natural, 12 h de luz natural + 4 h de luz artificial e 12 h de luz natural + 6 h de luz artificial. O delineamento experimental foi inteiramente casualizado, em arranjo fatorial 3 x 3, com três repetições. As respostas meteorológicas, fisiológicas e variáveis de desempenho dos animais foram registradas. O sistema de resfriamento evaporativo atenuou a ação dos agentes estressores e garantiu o alojamento térmico adequado para os animais. A frequência respiratória e a temperatura retal indicaram que o resfriamento evaporativo garantiu a manutenção da homeotermia. O ganho de peso e a conversão alimentar foram influenciados positivamente para os animais expostos ao resfriamento evaporativo, no entanto, sem efeito significativo dos programas de iluminação.