Young sows may develop infantile diseases. Some young sows, due to their postnatal endocrine disorders such as abnormal pituitary function, not only have a small birth weight, but also have poor postnatal development, resulting in a significant difference in physical fitness compared to young sows of the same age. Due to the inability of their reproductive system to develop normally, when young sows reach sexual maturity, their reproductive organs do not fully develop and there is no estrus cycle. Their appearance still shows the characteristics of young sows, which can be clearly seen on pig ultrasound. Due to insufficient breastfeeding or malnutrition caused by diseases, young sows can also develop stiff pigs and fail to reach sexual maturity. Such sows need to undergo ultrasound examination using pig ultrasound in advance to take measures for elimination as soon as possible.

Ovarian hypoplasia is prone to occur in young sows who suffer from chronic respiratory diseases, chronic digestive system diseases, parasitic diseases, etc. for a long time. Due to underdeveloped ovaries, there are no large follicles in the ovaries that can secrete sufficient hormones to induce estrus. The development of follicles is evident during ultrasound examination in pigs. When poor ovarian development is detected, measures should be taken.

Suffering from chronic wasting diseases, including chronic digestive system diseases (such as chronic dysentery), chronic respiratory system diseases (such as chronic pleurisy), and parasitic diseases. Sows suffering from this type of disease are generally thin, with significantly insufficient fat reserves, and their reproductive function is severely affected. By observing pigs with ultrasound, it can be clearly observed. Causing poor ovarian development or ovarian degeneration in sows, it is often found during autopsy that the ovaries are small and lack elasticity, with smooth surfaces or significantly smaller follicles (only about the size of millet grains).

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