An efficient method of early caponization in slow-growing meat-type chickens

Area of Science:

• Animal Science
• Veterinary Surgery
• Poultry Production

Background:

• Caponization is a common practice in poultry production.
• Traditional testectomy methods can be time-consuming and impact growth.
• Hinai-jidori chickens are a popular Japanese breed known for their slow-growing nature.

Purpose of the Study:

• To develop and evaluate a new surgical tool for testectomy.
• To investigate the efficiency of early caponization on time and growth performance in Hinai-jidori chickens.

Main Methods:

• Hinai-jidori chicks were divided into 2-, 4-, and 8-week caponized groups and an intact male group.
• Testes were removed using a traditional tool (8-wk group) or a new tool (2- and 4-wk groups).
• Caponizing time and growth performance were measured until 26 weeks of age.

Main Results:

• The new tool significantly reduced caponizing time: 35.9 s for 2-wk and 28.4 s for 4-wk old chicks, compared to 324.6 s for 8-wk old chicks using the traditional method.
• Chicks caponized at 4 weeks of age were significantly heavier at 10 and 18 weeks than those caponized at 8 weeks.
• Early caponization resulted in a smaller decrease in daily weight gain.

Conclusions:

• Early caponization using the new tool significantly shortens surgical time.
• This method improves growth performance and minimizes the negative impact on daily weight gain.
• The findings support efficient capon production in slow-growing chickens at earlier developmental stages.