Balanço eletrolítico e redução da proteína bruta da ração sobre parâmetros fisiológicos e sanguíneos de frangos de corte no calor

Matos, Marize Bastos de; Ferreira, Rony Antonio; Savaris, Vaneila Daniele Lenhardt; Couto, Humberto Pena; Soares, Rita da Trindade Ribeiro Nobre; Oliveira, Newton Tavares Escocard de

doi:10.4025/actascianimsci.v31i3.4792

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“…Frequência respiratória e temperatura cloacal são variáveis amplamente utilizadas e consideradas as mais simples, para avaliação da condição fisiológica dos animais (BIANCA e KUNZ, 1978;EIGENBERG et al, 2000;MATOS et al, 2009). A frequência respiratória é uma variável de fácil mensuração, através de análise visual; e a segunda, mensurada por meio de termômetros clínicos de mercúrio (BARBOSA FILHO, 2004;DAHLKE et al, 2005;MATOS et al, 2009), ou por meio de dataloggers eletrônicos (BROWN-BRANDTL et al, 2003), que se caracterizam pelo uso de sondas.…”

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“…Esses dados estão de acordo comMarchini et al (2007), que estudaram dois grupos de aves Avian durante os 42 dias de vida. Adotaram um grupo estressado diariamente a uma temperatura ambiental cíclica, e o outro submetido a uma condição de termoneutralidade, e relataram valores médios de 48 e de 57 mov.min -1 para a primeira e segunda semanas, respectivamente.Os resultados até os 14 dias também corroboramMatos et al (2009), que sob uma condição ambiental de 26° a 30°C de temperatura e umidade relativa entre 65 e 80%, verificaram uma média de 66 mov.min -1 para aves da linhagem Cobb dos sete aos 21 dias de vida. 10 -Valores médios da frequência respiratória para a terceira, quinta e sexta semanas de criação, para os quatro tratamentos, para as três condições estudadas e seus respectivos deltas, para ambas as linhagens diferentes (maiúsculas nas colunas e minúsculas nas linhas) indicam diferenças estatísticas (P<0,05) para cada uma das semanas pelo Teste de Tukey Esses resultados apontam para o fato de que 30 minutos de exposição foi o suficiente para que as aves alterassem significativamente sua FR, corroborando Yanagi…”

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Determinação do balanço de calor em frangos de corte por meio das temperaturas corporais

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Determination of heat balance in broiler chickens through body temperatures The aim of this research was to evaluate thermal behaviour of different broiler chicken strains submitted to stress and comfort through lifecycle. Thereunto, an experiment was accomplished in climatic chamber, during the six weeks of life of the birds, with the animals submitted to two environmental conditions: comfort and stress. Four treatments were adopted, defined as: treatment C60 (comfort condition), with 60 minutes of exposure; treatment E30, treatment E60 and treatment E90 (stress condition), with 30, 60 and 90 minutes of exposure, respectively. Experimental design adopted was a 4 x 4 latin square, characterized by four lots of birds, exposed to the four treatments, in the first four days of each week. Broiler, from Avian and Cobb strains, were divided in lots of 48 birds per week, totalizing 96 animals, and totalizing 586 animals, both sexes, during all experimental period. Climatic variables adopted to comfort and stress conditions differd through the weeks, once that thermal requirements of broiler chickens differ throughout growing cycle. In the first chapter, physiological variables respiration rate and cloacal temperature were studied, stipulating in this way, bands to comfort and stress conditions. Based on these variables, the tolerance of strains to thermal stress was studied, and was observed that Cobb strain is more tolerant to heat stress. In the second chapter, the influence of exposure time on superficial temperature was studied in the following body regions: wing, head, feet, back and comb. Exposure time did not influence, in none of weeks, superficial temperature of birds, with significative differences only among comfort and stress conditions. Based on these boards, and on these body regions, multiple linear regression models were determined to each week of lifecycle, to both strains, being named as TSM Nascimento. The selection of the models was done by maximum likelihood method, by Akaike's criteria (AIC) and by qui-square test to verify the number of body regions included in each one of the models. In the third chapter, was accomplished sensible and latent heat balance of the birds, based on superficial temperature models TSM Nascimento, core body temperature (adopted in the research as cloacal temperature) and on environmental variables collected during the research, to both strains. It was observed that in comfort condition, from third week of lifecycle and on, sensible exchanges corresponded for up to 80% of the total exchanges. In thermal stress, latent exchanges corresponded for up to 84% of the total. It was verified that broiler chickens are more susceptible to thermal stress in the third week of lifecycle.

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Determinação do balanço de calor em frangos de corte por meio das temperaturas corporais

Nascimento¹

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Balanço eletrolítico e redução da proteína bruta da ração sobre parâmetros fisiológicos e sanguíneos de frangos de corte no calor

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Determinação do balanço de calor em frangos de corte por meio das temperaturas corporais

Determinação do balanço de calor em frangos de corte por meio das temperaturas corporais

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