Linhagens de frangos caipiras criadas em sistema semi-intensivo em região de clima quente

Abstract

Resumo -O objetivo deste trabalho foi avaliar o desempenho, as variáveis fisiológicas e o comportamento de cinco linhagens de frangos de corte caipiras criadas em sistema semi-intensivo, em região de clima quente. Utilizaram-se 400 aves, com idade inicial de 35 dias, em cinco tratamentos representados pelas linhagens caipiras: Pescoço Pelado, Vermelho Pesadão, Carijó, Master Griss e Colorido. Utilizou-se um delineamento inteiramente casualizado, com quatro repetições e 20 parcelas. Avaliaram-se desempenho (ganho de peso, consumo de ração e conversão alimentar), temperatura retal, frequência respiratória e comportamento. Não houve diferenças significativas entre as linhagens para desempenho e variáveis fisiológicas. Todas as linhagens apresentaram desconforto térmico e, com base nos comportamentos observados, notou-se uma adaptação à alta temperatura. As linhagens Pescoço Pelado, Vermelho Pesadão, Carijó, Master Griss e Colorido podem ser utilizadas para a criação em sistema semi-intensivo, em região de clima quente.Termos para indexação: ambiência, avicultura alternativa, comportamento, desempenho. Strains of free-range broilers reared in semi-intensive system in a hot climate regionAbstract -The objective of this work was to evaluate the performance, physiological traits, and behavior of five lines of free-range broilers reared in a semi-intensive system in hot climate region. Four hundred birds, with an initial age of 35 days, were used in five treatments represented by the free-range lines: Pescoço Pelado, Vermelho Pesadão, Carijó, Master Griss, and Colorido lines. A completely randomized design with four replicates and 20 plots was used. Performance (weight gain, feed intake, and feed conversion), rectal temperature, respiratory frequency, and behavior were evaluated. There were no significant differences between the lines for performance and physiological variables. All lines showed thermal discomfort and, based on their behaviors, an adaptation trend to hot climate was noted. The Pescoço Pelado, Vermelho Pesadão, Carijó, Master Griss, and Colorido lines can be reared in semi-intensive systems in hot climate region.

Use of alternative tiles in the free-range broilers rearing: thermal environment, productive performance and physiological responses

“…Regardless of the type of tile used, the physiological variables of the broilers did not differ (Table 2). Dias et al (2016), in a research on the evaluation of free-range chicken lines in the northern region of Minas Gerais reared in aviaries with fiber cement tiles, found higher rectal temperature values, but close to those of this study, with an average of 41.5 °C. According to the researched literature (Dionello et al 2002;Silva et al 2003;Nazareno et al 2011), the rectal temperature averages that characterize a comfort condition for broilers vary between 41 to 42 °C, values close to found in that work.…”

“…Madeira et al (2010) in a study with birds of the Caipira Pesadão strain found values of weight gain and feed consumption different from those of this work being 3.21 kg and 10.76 kg, respectively, similarly to Castilho et al (2013) who obtained an average weight gain of 2.69 kg. However, Dias et al (2016) found values closer to that of this work for feed consumption (5.14 kg) and lower for feed conversion with an average of 2.94.…”

Evaluación del desarrollo de dos razas de gallinas de doble propósito en un sistema intensivo

“…Considerando lo anterior, la resistencia al calor constituye un factor importante en el desempeño productivo, ya que nuestro país presenta un clima tropical con temperaturas que pueden llegar a los 41 °C. En este sentido se puede mencionar el trabajo realizado por Nunes et al (10) en al año 2016 que, al someter a las aves de diferentes razas al estrés térmico, observaron mayor temperatura rectal en las aves de razas con plumajes completos en relación a aquellas con plumajes reducidos o de cuellos desnudos.…”

The Growth Pattern of Brazilian Canela-Preta Chickens with Different Plumages Reared in Two Rearing Systems

“…These activities may justify the lower initial weight gain of the semi-confined birds. Nevertheless, these specific characteristics contribute to free-range chicken products' differentiated taste and quality (Dias et al, 2016).…”