T/NAASS 175-2026 Active Group standards

T/NAASS 175-2026 Common Terms for Dairy Cow Reproduction in Large-Scale 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 175-2026

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 professional terms related to cattle breeding in large-scale dairy farms, including herd classification, technologies, and indicators. This document is applicable to large-scale dairy farms (with a herd size of over 1,000 cows) for dairy cow breeding and reproductive management. **Herd Classification Terms** 3.1 Lactating Dairy Cows Cows that have completed their first calving and entered the lactation phase. 3.2 Replacement Heifers Cows that have not reached breeding age or completed their first calving. 3.3 Hard-to-Conceive Cows Cows that have not conceived after three consecutive estrus cycles or have been in empty gestation for ≥150 days after calving. 3.4 Anestrous Cows Cows that do not show estrus symptoms or have ovarian atrophy. **Technical Terms** 4.1 Estrus Detection A method of determining whether a cow is in estrus based on changes in her behavior and reproductive physiology, including wax stripping, circle inspections, and pedometer detection. 4.2 Frozen Semen Thawing A thawing method using a 35-37°C water bath for at least 10 seconds, with sperm motility ≥40% and deformity rate ≤20% after thawing. 4.3 Ovulation Synchronization - Timed Artificial Insemination A technique that synchronizes the estrus and ovulation of cows to be inseminated at a fixed time through exogenous injections of reproductive hormones. 4.4 Pregnancy Test A process of determining whether a cow is pregnant using professional methods (early pregnancy factor detection, ultrasound, rectal palpation, etc.) 28–35 days, 60–66 days, 120–126 days after mating, and before dry period. **Indicators Terms** 5.1 Heat Detection Rate The percentage of cows detected in estrus during a specified period compared to the total number of cows that should be in estrus during that period. 5.2 21-Day Service Rate The percentage of cows serviced within 21 days compared to the total number of cows that should be serviced within that peri