China Agricultural University

China Shenhua Energy Company Limited

Shenhua (fujian ) Energy Company Limited

Shenhua Fuzhou Luoyuan Bay Port&power Co., Ltd

Shumin Wang

Lei An

Jianhui Tian

Yue Wang

Wei Zhao

Wei Wang

Zhonghong Wu

Guo Sun

Xing Wei

Lihua Cao

Zhijia Lv

Zhijiang Liu

Yanchao Li

Weibin Zeng

Yusheng Qin

Qianying Yang

Fupeng Wang

The present disclosure relates to the field of livestock farming, and specifically provides a feeding method for gilts in batch for promoting onset of puberty and alleviating estrus disorder of gilts, which is aiming at an industrial problem that a large number of gilts are culled due to delayed puberty onset or estrus disorder. The method includes: feeding, prior to onset of puberty for gilts with vitamin A combined with lactic acid; and performing, subsequent to the puberty onset of gilts, estrus synchronization treatment and insemination treatment on the gilts. By applying vitamin A combined with lactic acid, the present disclosure alleviates the delayed puberty onset or estrus disorder of the gilts, reduces the feeding duration and feeding cost of the gilts, facilitates synchronous estrus treatment of the gilts.

Methods of administering vitamin A and lactic acid to gilts

The disclosure relates to the field of biology and provides a breeding method for ameliorating or avoiding the adverse effects of exogenous gonadotropins on reproductive performance, which comprises administrating N-acetylcysteine and vitamin A prior to the exogenous gonadotropin treatment. The disclosure can effectively improve the reproductive performance, including improving the uterine receptivity and pregnancy outcome after exogenous gonadotropins treatment, such as embryo implantation rate, the status of embryo development after implantation, pregnancy rate, live birth, health condition of born offspring, and other effects, by using a combination of N-acetylcysteine and vitamin A. Moreover, the combination of N-acetylcysteine and vitamin A has synergistic effect and has a wide application prospect, for example, in animal husbandry to realize the reproduction regulation and control management of animals including domestic animals such as pigs, horses, cattle, and the like and realize batch production, as well as in the field of assisted reproduction, with high application value.

Method for ameliorating or avoiding the adverse effects of exogenous gonadotropins on reproductive performance

Provided is a steam turbine overspeed protection system, includes a drive gear arranged to match a rotation speed of a rotor of a steam turbine; a rotating shaft parallel to an axis of the drive gear and capable of rotating at a critical rotation speed; a protective gear arranged on the rotating shaft and forming a lead screw nut mechanism with the rotating shaft, and arranged to be capable of engaging with the drive gear when the rotation speed of the drive gear exceeds the critical rotation speed; and an operating rod connected to the protective gear; wherein, when the drive gear engages with the protective gear, the protective gear can move in the axial direction of the rotating shaft and thereby drive the operating rod to move and produce an action that activates a protection device for preventing steam turbine overspeed.

Steam turbine overspeed protection system, and steam turbine

The present invention provides a method for inducing twin calving. The method according to the present invention comprises firstly treatment to inducing atresia of the antral follicles on ovary so as to initiate the development of new follicular wave, inducing the development of codominant follicles and further achieving double ovulations by exactly controlling the dosage and time points of hormone injections, and performing artificial insemination to induce the cow to deliver twin calves. The method according to the present invention has relative independent on the technical skills, and a person skilled in the art or a common worker can practice it according to specified operation methods; and during practical application, it does not require special equipment, thus saving cost, as well as improving the social benefit and economic benefit of cow breeding.

Method for inducing twin calving

Growing community of inventors

Beijing, China

Shumin Wang