Age is a critical factor in determining the quality and productivity of breeding stock. It's recommended to use seedlings for a period of 1 to 4 years. The female breeding rate was recorded as 79.6%, 93.7%, 100%, 100%, and 70% at ages 1 through 5, respectively. Additionally, the pregnancy rate from females aged 1 to 5 was 78.7%, 88.7%, 96.1%, 95%, and 76%. Based on these statistics, it's clear that the species should not be kept beyond the age of four to maintain optimal reproductive performance.
Animals with poor physical shape, low body mass, deformities, or incomplete development, as well as those suffering from self-biting behavior or chronic illnesses, should not be retained for breeding purposes. These conditions can negatively impact both the health of the animal and the success of the breeding program.
Low fertility is another important consideration. At the start of the breeding season, it's generally expected that no fewer than four females will give birth. Females aged between 4 and 5 years are considered high-yield individuals if they consistently produce more than six offspring. Each year, breeding stock should be paired with more than four females, and the number of breeding sessions should exceed ten. If this standard isn't met, adjustments must be made to ensure continued productivity.
Color and fur quality are also key indicators of a breeding animal's suitability. Factors such as color intensity, shine, fur density, hair length, and even distribution help determine the quality of the animal. For example, male boars with dark brown coats that are either too light or unevenly colored, with sparse or irregular fur and excessively long hairs, or those with an excessive amount of coarse guard hairs, should not be selected for breeding. These characteristics indicate lower quality and may affect the overall performance of the breeding herd.
In summary, maintaining a healthy, productive breeding population requires careful selection based on age, physical condition, fertility, and appearance. By following these guidelines, breeders can ensure better outcomes and sustainable production over time.
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