Reese, Sven ![]() |
| 4MB |
Abstract
In the three decades since its inception, the sex-sorting technology has progressed significantly. However, field studies report conflicting findings regarding reproductive outcomes. Therefore, we conducted this meta-analysis of all trials published between 1999 and 2021. Non-return rates after 24 or 60 d (NRR 24/60), pregnancy, calving, abortion, and stillbirth rates were compared after AI with sex-sorted vs non-sorted sperm. Additionally, the impact of recent developments in the sex-sorting technology was assessed. Of 860 studies found, 45 studies (72 trials) provided extractable data and were included. Overall, the results of this meta-analysis provided evidence that the NRR 24/60 was diminished by 13%, pregnancy rates were reduced by 23% (25% cows, 21% heifers) and calving rates were reduced by 24% when using sex-sorted sperm. Enhancing the dosage to 4 million sex-sorted sperm/straw (including recent improvements, high vs low dose) as well as using fresh sex-sorted sperm (sorted vs non-sorted) increased pregnancy rate ratios by 7 percentage points. The refinement of the sex-sorting technology after 2015 resulted in a lowered reduction of pregnancy and calving rate of 19% and 23%, respectively. Whereas abortion rates were similar, the stillbirth of male calves was increased by 6.3%.
Item Type: | Journal article |
---|---|
Form of publication: | Publisher's Version |
Faculties: | Veterinary Medicine Veterinary Medicine > Department of Veterinary Medicine Veterinary Medicine > Department of Veterinary Medicine > Lehrstuhl für Anatomie, Histologie und Embryologie |
Subjects: | 600 Technology > 610 Medicine and health 600 Technology > 630 Agriculture |
URN: | urn:nbn:de:bvb:19-epub-77187-9 |
ISSN: | 2045-2322 |
ID Code: | 77187 |
Deposited On: | 31. Aug 2021 15:30 |
Last Modified: | 31. Aug 2021 15:30 |