T/NAASS 174-2026 Active Group standards

T/NAASS 174-2026 Technical Specification for Reproduction of High-Yielding Dairy Cows in Ningxia Large-Dairy Farms

Publish Date: 2026-01-15 Implement Date: 2026-01-25 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 174-2026

Standard Type: Group standards

Standard Status: Active

is_force_gb: no

CCS Name: -

ICS Name: Animal husbandry and breeding

Publish Date: 2026-01-15

Implement Date: 2026-01-25

Scope

This document specifies the technical requirements for the breeding process of high-yield dairy cows, including estrus detection and recording, synchronized ovulation and timed artificial insemination (TAI), frozen semen thawing procedures, artificial insemination procedures, embryo transfer, pregnancy check procedures, and reproductive data management. This document is applicable to the breeding management of high-yield dairy cows in large-scale farms. **Terms and Definitions** There are no terms or definitions that need to be defined in this document. **4. Estrus Detection and Recording** 4.1 Detection Follow the procedures specified in T/NAASS015. 4.2 Recording When the estrus monitoring system is manned (06:00-24:00), promptly dispatch personnel to the scene to observe and verify the estrus situation if the system prompts an estrus event. When the estrus monitoring system is unmanned (00:00-06:00), arrange dedicated personnel to observe on-site, with each barn observed for no less than 30 minutes, and fill out the estrus record form. The record form is provided in Appendix A1. **5. Synchronized Ovulation and Timed Artificial Insemination (TAI)** 5.1 Double-synchronized protocol GnRH17dPG13dGnRH27dPG21dPG332hGnRH418hTAI. 5.2 Pregnancy Check for Non-Pregnant Cows in the Synchronized Protocol 5.2.1 Early pregnancy check: AI25-31dGnRH6dUltrasound; 5.2.2 Ultrasound showing no corpus luteum: 1dGnRH+CIDR7dPG+CIDR1dPG1.5dGnRH18hTAI; 5.2.3 Ultrasound showing a corpus luteum: 1dPG1dPG1.5dGnRH18hTAI. 5.3 Youth Cow Synchronized Protocol 5.3.1 When youth cows meet the breeding standards, observe their estrus and inseminate them immediately upon estrus. 5.3.2 For non-pregnant cows aged ≥420 days, inject PG and inseminate them immediately upon estrus. 5.3.3 For non-pregnant cows aged ≥434 days, inject PG and inseminate them immediately upon estrus. 5.3.4 For non-pregnant or aborted cows aged ≥448 days, implement GnRH15dPG11dPG232h