4 recruit gilts as early as possible to start the first love, the sooner to make money, earn more money

1. Advantages of starting puberty as early as possible

Some pig farms think that reserve sows can be in estrus, and early and late will not have much impact. In fact, the time of proestrus can predict the reproductive performance and service life of reserve sows. It can be concluded that the reserve sows with earlier puberty have longer service life, lower subsequent knockout rate, better reproductive performance and more total litter size.

two。 The key factors in the initiation of reserve proestrus

(1) gonadal development

The initiation of proestrus is related to the improvement of the growth and secretory function of the hypothalamic-pituitary-ovary axis. The gonadotropin-releasing hormone secreted by the hypothalamus increases, which promotes the gonadal hormone secretion, and the ovary grows and matures faster, which causes the follicles on the ovary to grow and mature, secretes estrogen into the blood, and stimulates the growth and development of the reproductive tract. With the cooperation of a small amount of progesterone, estrogen stimulates the central nervous system and finally shows estrus.

(2) Age and physical condition

There are many theories about the conditions of proestrus of reserve sows, and the general pig farms are judged on the basis of body weight and age. There are also differences in the criteria of weight and age in different studies, indicating that weight and age are key factors but not absolute factors in the initial stage of initiation.

(3) Boar seduction

(4) feeding level

High energy level feeding can shorten the initiation of puberty, and the corresponding mating weight can also be increased. This effect is not indirectly through the increase of body storage in reserve sows, but directly affects the reproductive system, such as promoting the development of ovaries and follicles.

3. Summary

The time of proestrus can show the reproductive performance and service life of reserve sows. The reserve sows with earlier proestrus have longer service life, lower subsequent knockout rate, better reproductive performance, more total litter size, and greater benefits from pig farms. The initial estrus initiation of reserve sows is related to many factors, such as sow age, growth rate, reproductive system development and boar attraction.

The main results are as follows: (1) to supplement sufficient reproductive effects to promote the development of reproductive system of reserve sows.

(2) feeding scientifically and properly increasing the reproductive rate of reserve sows to make them reach qualified body reserve at the suitable age (about 170 days old).

(3) do a good job of boar seduction (150-170 days old, 95-100kg)