Navegando por Autor "Almeida, Gledson Luiz Pontes de"
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Item Behavior of pigs subjected to climate control system in the Semi-arid Region of Pernambuco, Brazil(2021) Gomes, Nicoly Farias; Pandorfi, Héliton; Barnabé, Janice Maria Coelho; Guiselini, Cristiane; Almeida, Gledson Luiz Pontes de; Holanda, Mônica Calixto Ribeiro de; Holanda, Marco Aurélio Carneiro de; Silva, Marcos Vinícius daAbstract The objective was to thermally characterize the facilities during the growth and finishing phases of pigs and to evaluate the influence of climate control systems on the expression of the behaviors of pigs. The experiment was conducted at the Federal Rural University of Pernambuco, Serra Talhada, PE, Brazil, during the spring of 2019. Twenty-seven pigs aged 63 days were used. The animals were submitted to pens without climate control system, with forced ventilation, and with an evaporative adiabatic cooling system. Dry bulb temperature (°C), relative air humidity (%), black globe temperature (°C), and swine behavioral responses were recorded, submitted to multivariate analysis, using the principal component technique. Pens with the evaporative adiabatic cooling system showed a significant reduction in air temperature and an increase in relative air humidity, during the two phases. Pigs submitted to evaporative cooling showed greater ingestive activity and lethargic behavior, typical of the studied phases. Resumen El objetivo fue caracterizar térmicamente las instalaciones durante las fases de crecimiento y finalización de los cerdos y evaluar la influencia de los sistemas de control climático en la expresión de los comportamientos de los cerdos. El experimento se realizó en la Universidad Federal Rural de Pernambuco, Serra Talhada, PE, Brasil, durante la primavera de 2019. Se utilizaron 27 cerdos de 63 días. Los animales fueron sometidos a corrales sin sistema de climatización, con ventilación forzada y con sistema de enfriamiento adiabático evaporativo. Se registraron la temperatura de bulbo seco (° C), la humedad relativa del aire (%), la temperatura del globo negro (° C) y las respuestas de comportamiento de los cerdos, sometidas a análisis multivariante, utilizando la técnica de componentes principales. Los corrales con sistema de enfriamiento adiabático evaporativo mostraron una reducción significativa de la temperatura del aire y un aumento de la humedad relativa del aire, durante las dos fases. Los cerdos sometidos a enfriamiento evaporativo mostraron mayor actividad ingestiva y comportamiento letárgico, propio de las fases estudiadas.Item Influence of meteorological elements on behavioral responses of gir cows and effects on milk quality(2021) Silva, Marcos Vinícius da; Almeida, Gledson Luiz Pontes de; Pandorfi, Héliton; Moraes, Alex Souza; Macêdo, Gleidiana Amélia Pontes de Almeida; Batista, Pedro Henrique Dias; Silva, Rodes Angelo Batista da; Guiselini, CristianeABSTRACT. This study aimed to analyze the principal components of the meteorological variables, physiological and behavioral response of cows subjected to different cooling times and their influence on milk quality, in the dry and rainfall periods, and to establish multiple regression models for milk quality. The data used in the study came from an experiment conducted in the Agreste Region of Pernambuco. The pre-milking cooling time was 10, 20, 30 min. and the control (without cooling). Sixteen multiparous lactating Gir cows were selected. Data were analyzed by principal component analysis and a multiple regression analysis was applied to determine milk quality. There was a strong relationship between somatic cell count (SCC) and activity of the animal in the shade for dry, and lying for rainfall, with increased SCC in cow milk. It was possible to establish two multiple regression models to determine milk quality in dry and rainfall periods. According to the principal component analysis, the cooling time to meet the thermal requirement of the animals was 20 min., regardless of the season and milking shift.Item Influence of meteorological elements on behavioral responses of gir cows and effects on milk quality(2021) Silva, Marcos Vinícius da; Almeida, Gledson Luiz Pontes de; Pandorfi, Héliton; Moraes, Alex Souza; Macêdo, Gleidiana Amélia Pontes de Almeida; Batista, Pedro Henrique Dias; Silva, Rodes Angelo Batista da; Guiselini, CristianeABSTRACT. This study aimed to analyze the principal components of the meteorological variables, physiological and behavioral response of cows subjected to different cooling times and their influence on milk quality, in the dry and rainfall periods, and to establish multiple regression models for milk quality. The data used in the study came from an experiment conducted in the Agreste Region of Pernambuco. The pre-milking cooling time was 10, 20, 30 min. and the control (without cooling). Sixteen multiparous lactating Gir cows were selected. Data were analyzed by principal component analysis and a multiple regression analysis was applied to determine milk quality. There was a strong relationship between somatic cell count (SCC) and activity of the animal in the shade for dry, and lying for rainfall, with increased SCC in cow milk. It was possible to establish two multiple regression models to determine milk quality in dry and rainfall periods. According to the principal component analysis, the cooling time to meet the thermal requirement of the animals was 20 min., regardless of the season and milking shift.Item Thermal comfort and productive responses of 7/8 holstein-gyr cows subjected to cooling system(2023) Silva, Marcos Vinícius da; Almeida, Gledson Luiz Pontes de; Pandorfi, Héliton; Moraes, Alex Souza; Macêdo, Gleidiana Amélia Pontes de Almeida; Oliveira, Maria Eduarda Gonçalves de; Melo, Maria Vitória Neves de; Santana, Taize CalvacanteABSTRACT. The objective of this research was to identify the influence of the evaporative adiabatic cooling system (EACS) on the thermal comfort and productive responses of dairy cattle, through multivariate analysis by principal components (PC), in the summer and winter seasons of the semiarid region of Pernambuco, Brazil. The data came from an experiment that included 16 multiparous lactating cows (7/8 Holstein-Gyr), randomly distributed in 4 sets, with 4 experimental phases and 4 treatments (0, 10, 20, and 30 min.). The multivariate analysis was carried out through PC for the thermal comfort indices, physiological variables, and milk production and composition. The highest milk production in the summer season was obtained for animals exposed to the cooling system for 30 min. In the winter season in the morning period, the use of the EACS for 10 min. was sufficient for improvements in milk production. The times of exposure to EACS caused changes in the composition of milk, for both seasons. Principal component analysis made it possible to verify a positive correlation of evaporative cooling with thermal comfort, physiological responses, and production and composition of milk of lactating cows.Item Thermal comfort and productive responses of 7/8 holstein-gyr cows subjected to cooling system(2023) Silva, Marcos Vinícius da; Almeida, Gledson Luiz Pontes de; Pandorfi, Héliton; Moraes, Alex Souza; Macêdo, Gleidiana Amélia Pontes de Almeida; Oliveira, Maria Eduarda Gonçalves de; Melo, Maria Vitória Neves de; Santana, Taize CalvacanteABSTRACT. The objective of this research was to identify the influence of the evaporative adiabatic cooling system (EACS) on the thermal comfort and productive responses of dairy cattle, through multivariate analysis by principal components (PC), in the summer and winter seasons of the semiarid region of Pernambuco, Brazil. The data came from an experiment that included 16 multiparous lactating cows (7/8 Holstein-Gyr), randomly distributed in 4 sets, with 4 experimental phases and 4 treatments (0, 10, 20, and 30 min.). The multivariate analysis was carried out through PC for the thermal comfort indices, physiological variables, and milk production and composition. The highest milk production in the summer season was obtained for animals exposed to the cooling system for 30 min. In the winter season in the morning period, the use of the EACS for 10 min. was sufficient for improvements in milk production. The times of exposure to EACS caused changes in the composition of milk, for both seasons. Principal component analysis made it possible to verify a positive correlation of evaporative cooling with thermal comfort, physiological responses, and production and composition of milk of lactating cows.