Escores de cloaca e de crista e morfometria testicular em galos de matriz pesada com 71 semanas de idade e três categorias de peso corporal

Abstract

Escores de cloaca e de crista e morfometria testicular em galos de matriz pesada com 71 semanas de idade e três categorias de peso corporal [Cloaca and comb scores and testicular

Comb, cloaca and feet scores and testis morphometry in male broiler breeders at two different ages

“…Moderate and positive correlation was also found between COS and TW. These results suggest that heavier roosters have larger testes and consequently more androgen production capacity that will influence the highest COS. A similar result was obtained by Rezende et al (2014) for both associations. Positive, moderate, and significant correlation was found between COS and diameter of seminiferous tubule for both of the ages, and between COS and seminiferous epithelium height in 45-week roosters.…”

“…From this data, three body weight categories were established. The weight values ± 10% of the sample weight average were considered borderline between heavy / medium and medium / light categories, according to the methodology used by Rezende et al (2014). After weighing and establishment of body weight categories, all roosters were inspected by a single trained evaluator, to evaluate the comb and cloaca morphology and the presence of lesions in the feet.…”

“…After weighing and establishment of body weight categories, all roosters were inspected by a single trained evaluator, to evaluate the comb and cloaca morphology and the presence of lesions in the feet. Thus, comb, cloaca, and feet scores were established following the same methodology described by Rezende et al (2014 Figure 1) were performed, and the arithmetic mean of these values was used for statistical analysis. The same images used for measuring diameters were used to measure the seminiferous epithelium height.…”

“…Alternative reproductive assessment methods have been proposed for the selection of genetically superior roosters in order to improve fertility. Among them, the use of testicular ultrasound can be observed, withdrawing squad cocks which have characteristics that might lead to sexual incompetence, for example, excess or deficiency of body weight; problems associated with the legs and the feet; and evaluation of phenotypic features suggestive of subfertility such as low quality comb, or small, pale and dry cloaca (Amann, 1999;McGary et al, 2002;Rezende et al, 2014). Body weight is known to have an association with testes weight and, in 71-week roosters, cloaca and comb scores can be used with moderate potential prediction to identify low testes weight (Rezende et al, 2014).…”

“…Among them, the use of testicular ultrasound can be observed, withdrawing squad cocks which have characteristics that might lead to sexual incompetence, for example, excess or deficiency of body weight; problems associated with the legs and the feet; and evaluation of phenotypic features suggestive of subfertility such as low quality comb, or small, pale and dry cloaca (Amann, 1999;McGary et al, 2002;Rezende et al, 2014). Body weight is known to have an association with testes weight and, in 71-week roosters, cloaca and comb scores can be used with moderate potential prediction to identify low testes weight (Rezende et al, 2014). In order to better understand the current reproductive profile of broiler breeder roosters and to increase reproductive efficiency in commercial batches by selecting reproductively superior roosters, it is necessary to monitor their reproductive status in different stages of life.…”