T/NAASS 015-2022 Active Group standards

T/NAASS 015-2022 Ningxia dairy cow estrus identification technical regulations

Publish Date: 2022-11-11 Implement Date: 2022-12-15 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: T/NAASS 015-2022

Standard Type: Group standards

Standard Status: Active

is_force_gb: no

CCS Name: -

ICS Name: Animal husbandry and breeding

Publish Date: 2022-11-11

Implement Date: 2022-12-15

Scope

Scope: This document specifies the selection and management of donor cows for embryo transplantation in high-yield dairy cows in Ningxia, as well as the selection of frozen semen, superovulation of donor cows, artificial insemination of donor cows, embryo collection and retrieval, and technical requirements for embryo transplantation. This document is applicable to the standardized operation of embryo production and transplantation technology promotion and application in high-yield dairy cows in Ningxia. Main technical content: 3. Terms and definitions The following terms and definitions are applicable to this document. 3.1 Oestrus cycle The period between the onset of oestrus and the next onset, or between the end of one oestrus and the onset of the next, during which a series of cyclical changes and sexual activities occur in the reproductive organs and the entire organism under the control of reproductive hormones in female animals after they reach puberty. 3.2 Hang line A reproductive tract characteristic exhibited during the oestrus period of cows, characterized by the discharge of a viscous or whitish mucus from the vulva, which hangs outside the vulva or stains the surrounding area. 3.3 Recessive oestrus A condition in which cows lack obvious oestrus characteristics or symptoms, exhibit no sexual desire during oestrus, and show no significant changes in mental state. However, a mature follicle may be discharged. It is common in high-yield cows and emaciated cows, and more prevalent in winter. 3.4 Fake oestrus A condition in which cows exhibit sexual desire and accept mounting, but without uterine contractions, oestrus mucus, or developing follicles. It is typically observed in cows around the fifth month of pregnancy. 3.5 Continuous oestrus A condition in which cows exhibit obvious oestrus symptoms, delayed or absent ovulation, leading to continued enlargement and hyperplasia of follicles, excessive estrogen secretion stimulating the