The effect of nutrition on the follicular wave of dairy cows found that cows fed low-energy feeds had a higher probability of 3 follicular wave cycles, and cows fed high-energy feeds had a higher probability of 2 follicular wave cycles. The occurrence of these follicular waves can be clearly observed through B-ultrasound of dairy cows.

P4 controls the turnover of follicles. Sheep in good condition have higher P4 levels, which promotes the dynamic development of follicles. Adding fat to the diet not only improves the conception rate of lactating cows, but also stimulates the development of follicles in the early postpartum period. In a diet with 14.5% whole cottonseed, 2.2% of corn is replaced with 2.2% calcium soap, and this diet is fed from calving.

25 days after delivery, it was found that the number of medium-sized follicles increased and the number of small follicles decreased through B-ultrasound of dairy cows, which indicated that fat promoted the development of small follicles into medium follicles. Synchronized estrus treatment was carried out 25 days after delivery, and the number of small follicles and large follicles increased. The increase in the number of small follicles reflected the increase in the number of follicles that could develop in the follicle bank, and the diameter of large follicles and second-largest follicles increased significantly.

Insufficient energy causes LH deficiency, reduced progesterone levels, and even makes follicles unable to mature and discharge, and embryo implantation difficult; high-protein diets increase early embryo mortality, and stillbirth is judged on B-ultrasound of dairy cows. The relationship between the growth and development of dairy cow follicles and trace elements indicates that the growth and development of cow follicles requires a relatively stable trace element environment. Therefore, reasonable feed and good body condition are conducive to the growth and development of animal ovarian follicles.