Overage should not be retained. It is recommended to use seedlings for a period of 1 to 4 years. The female breeding rate was 79.6%, 93.7%, 100%, 100%, and 70% from 1 to 5 years of age, respectively, while the pregnancy rate in females aged 1 to 5 years was 78.7%, 88.7%, 96.1%, 95%, and 76%. Therefore, it's essential that the species does not exceed 4 years of age to maintain optimal productivity.
Animals with poor shape, weak constitution, deformities, incomplete development, or those suffering from self-biting behavior or chronic illnesses should not be kept for breeding purposes. These individuals are less likely to contribute positively to the population and may pose risks to overall health and productivity.
Low fertility should also disqualify an animal from being used as a breeder. Typically, at the start of the breeding season, there should be no fewer than 4 females. Those aged between 4 and 5 years are considered high-yield females. Each year, breeding stock should be mated with more than 4 females, and the mating frequency should exceed 10 times. If this is not met, adjustments must be made to ensure breeding efficiency.
Color and fur quality are important indicators of a breed’s quality. Factors such as color vibrancy, luster, hair density, length, and even distribution help determine the quality of the animal. For example, male boars with dark brown coats that appear too light, sparse hair, uneven distribution, excessive length, or an abundance of coarse hairs are not suitable for breeding and should not be retained.
In summary, maintaining a healthy and productive breeding stock requires careful selection based on age, physical condition, fertility, and appearance. By following these guidelines, breeders can ensure better outcomes and long-term sustainability of their breeding programs.
Sunshade Net,White Agriculture Shade Cloth,Air Filter Aluminum Foil Net,Fence Balcony Privacy Netting
Changzhou Green Nets Co.,Ltd. , https://www.czglnets.com