Behavior of chicks subjected to thermal challenge

Abstract

ABSTRACT:In the first week of a chick life, broilers are very sensitive to different conditions outside their thermoneutral zone. Thus, the goal of this study was to evaluate the behaviors and productive responses of broilers subjected to conditions of thermal comfort or challenge at different intensities (27, 30, 33 and 36°C) and durations (1, 2, 3 and 4 days starting on the second day of life). In the experiment, ten minutes of images from each hour of each treatment were analyzed to evaluate the key behaviors of the birds. Similar behavior at different dry-bulb air temperatures were identified by using Ward's method of cluster analysis. These behaviors were grouped by dendograms in which the similarity of these data was qualified. Feed intake, water intake and body mass of these animals were evaluated and used to support the observed behaviors. Thus, a similar huddling behavior was observed in the birds from the 2 nd to the 5 th day of life subjected to 27°C and 30°C, while at 30°C and 33°C the behavior of accessing feeders and drinkers was also similar. Chicks subjected to 33°C presented the best performance, and at 30 and 36°C showed intermediate development. KEYWORDS:Grouping of data, Dendogram, Broiler, Productive responses. COMPORTAMENTO DE PINTINHOS SUBMETIDOS A ESTRESSE TÉRMICORESUMO: Na primeira semana de vida, frangos de corte são muito sensíveis a condições diferentes de suas temperaturas de conforto. Dessa forma, objetiva-se com o presente trabalho avaliar o comportamento e as respostas produtivas de frangos de corte submetidos a condições de conforto e estresse térmico em diferentes intensidades (27; 30; 33 e 36°C) e períodos de duração (1; 2; 3 e 4 dias a partir do 2° dia de vida). No experimento, diariamente, monitoraram-se dez minutos de imagens de cada hora, de cada tratamento, para a avaliação dos principais comportamentos das aves. Os comportamentos similares em diferentes temperaturas foram identificados usando o método de análise de cluster de Ward e foram agrupados por dendogramas em que se classificou a similaridade destes dados. O consumo de ração, consumo de água e massa corporal destes animais foram avaliados e usados para dar suporte aos comportamentos observados. Dessa forma, observouse o comportamento similar das aves do 2º ao 5º dia de vida, submetidas a 27 e 30 °C em permanecerem agrupadas e/ou isoladas, e a 30 e 33 °C em permanecerem nos bebedouros e/ou comedouros. As aves submetidas a 33°C apresentaram o melhor desempenho, e a 30 e 36°C apresentaram desempenhos intermediários. PALAVRAS-CHAVE: Agrupamento de dados. Dendograma. Frango de corte. Respostas produtivas.

Properties of conventional and alternative bedding materials for dairy cattle

“…In the present study, the relative levels of each PS were determined, and then, all data were z-score transformed to produce a heat map using a supervised HCA method, as described by Ferraz et al (2014). The clustering method and similarity measure were set as the unweighted average and Euclidean distance, respectively.…”

Noise Levels Emitted by Agricultural Tractors With and Without Implements Activation

“…Hierarchical clustering analysis was developed to make a comparison of all studied scenarios, using average values (Figure 6). This analysis is used to separate objects into groups based on the characteristics of the objects (Ferraz et al, 2014). According to Linden (2009), the basic idea is to put in the same group objects that are similar according to some predetermined criterion.…”

“…The basic idea is to put in the same group objects that are similar according to some predetermined criterion (LINDEN, 2009). The HCA was proceeded according to Lau et al (2009) and Ferraz et al (2014). The cluster heat map described the results of this analysis.…”

Comportamento De Codornas Japonesas Submetidas a Diferentes Temperaturas

“…Para a análise comportamental foi utilizado o agrupamento hierárquico aglomerativo (AHA), que separa objetos em grupos, baseando-se nas características destes objetos, por meio de critério de classificação, de tal forma que exista homogeneidade dentro do grupo e heterogeneidade entre os grupos, o que permite separar os tratamentos em que as codornas apresentaram comportamentos semelhantes (Ferraz et al, 2014). Os resultados do método AHA foram descritos por meio de dendrograma, que é um diagrama de similaridade, quantificado através do método de Ward e da distância euclidiana.…”