FSH/LH protocol may improve follicle yield before calf LOPU

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Researchers reporting in Latest Results say adding LH activity to follicle-stimulating hormone during hormonal superstimulation improved follicular response before laparoscopic ovum pick-up, or LOPU, in prepubertal Holstein-Friesian calves. The study compared FSH-only and combined FSH/LH regimens and found the combined approach produced significantly more ovarian follicles, with the goal of improving oocyte recovery and downstream embryo production from sexually immature donors. That fits with earlier cattle reproduction research showing LOPU followed by in vitro embryo production can shorten the generation interval in dairy breeding, and that protocols incorporating gonadotropins with LH-like activity have, in some settings, improved transferable embryo rates or follicular development in calf donors. (pubmed.ncbi.nlm.nih.gov)

Why it matters: For veterinary professionals working in advanced bovine reproduction, the finding points to a practical lever for improving juvenile in vitro embryo transfer programs: better follicular recruitment at the superstimulation stage. That matters because prepubertal calf oocytes are attractive for accelerating genetic gain, but they generally have lower developmental competence than oocytes from adult donors, so protocol refinements that increase the pool of aspiratable follicles may help offset one of the main bottlenecks in calf LOPU-IVEP systems. The bigger question for clinics and embryo programs is whether the added follicles translate into more usable embryos, better pregnancy outcomes, and acceptable cost-benefit and welfare profiles under commercial conditions. (pubmed.ncbi.nlm.nih.gov)

What to watch: Watch for the full paper or follow-up data on oocyte quality, blastocyst yield, pregnancy results, and whether combined FSH/LH protocols outperform FSH alone outside controlled research settings. (pubmed.ncbi.nlm.nih.gov)