The formation of stiff pigs is the result of a combination of multiple factors, mainly including the following aspects: 1. Congenital factors
1. Inbreeding: Inbreeding can lead to the degeneration of offspring breeds, stagnation of growth and development, and the formation of stiff pigs.
2. Early mating of sows: Mating young sows before their bodies are fully developed can easily lead to poor embryo development, low birth weight and weaning weight, weak piglet vitality, and slow growth and development in the later stages.
3. Poor physical condition of sows: The aging of breeding pigs can lead to a decrease in physical condition and insufficient reserve for pregnancy and childbirth, which can also affect the growth and development of offspring. 2、 Improper feeding and management
1. Insufficient nutrition in sows: Improper feeding and malnutrition in pregnant sows can lead to poor fetal development, resulting in small birth weight, weak physical constitution, low vitality, and easy formation of stiff pigs.
2. Poor management of lactating sows: Low lactation ability of sows, or inadequate fixation of nipples in piglets after birth, resulting in insufficient breast milk for piglets and affecting their growth and development.
3. Improper weaning: Improper weaning of piglets, such as early or late weaning, unreasonable feed transition, etc., can cause serious weight loss and even illness, affecting growth.
4. Feed problem: After weaning piglets, if the nutrition of the feed cannot meet their growth needs, or if the feed quality is poor or if the feed is suddenly changed, it will affect digestion and absorption, leading to the formation of stiff pigs. 3、 Disease factors
1. Diseases of sows, such as reproductive disorders, breast diseases, postpartum paralysis, etc., can affect the milk production and quality of sows, thereby affecting the growth of piglets.
2. Piglet diseases: Piglets suffer from chronic diseases such as asthma, chronic enteritis, anemia, piglet dysentery, piglet paratyphoid fever, etc; Suffering from parasitic diseases both inside and outside the body, such as lung worms, roundworms, tapeworms, scabies, pig lice, etc; Suffering from surgical diseases, such as intestinal adhesions after castration, can affect the growth and development of piglets. 4、 Drug effects
Some drugs, such as chloramphenicol, have inhibitory effects on protein synthesis and bone marrow hematopoietic function. If pigs use such drugs for a long time or excessively, it can cause aplastic anemia, weakened physical condition, and ultimately become stiff pigs. 5、 Environmental factors
The harsh environment of pigsty, such as low temperature, high humidity, poor ventilation, etc., can affect the growth and development of pigs and increase the risk of stiff pigs.
The formation of stiff pigs is a complex process involving multiple aspects such as congenital factors, feeding management, diseases, drugs, and environment. In order to reduce the occurrence of stiff pigs, farmers need to strengthen the feeding and management of sows and piglets, reasonably allocate feed, and do a good job in disease prevention and environmental control. At the same time, targeted measures should be taken to regulate and treat the already formed stiff pigs, in order to improve the overall health level and breeding efficiency of the pig population.