Original title: Developmental and transcriptomic alterations in bovine blastocysts derived from oocytes of donors exposed to toxic tall fescue
Some tall fescue grass carries a fungus that produces ergot alkaloidsChemicals produced by a fungus that grows in some tall fescue grass and are linked to cattle reproductive problems., chemicals linked to reproductive problems in cattle. Researchers fed one group of heifers this grass and another group fungus-free grass, then collected eggs and made embryos in the lab. The exposed group had fewer eggs and early embryos that had begun dividing. In a small gene study, all 79 genes that differed between groups were more active in embryos from exposed heifers.
Imagine packing lunch for a trip using food prepared the night before. If some ingredients are spoiled, the meal may not come together properly the next day. In this paper, the egg cells are like that prepared food: what the mother cow has been exposed to may affect what they carry into early embryo development.
Beef producers rely on healthy eggs and embryos to produce calves. The results suggest that exposure to toxic tall fescue before conception may affect both how many eggs develop and the activity of genes in early embryos.
The RNA sequencing covered only eight blastocysts, with four from each group. The abstract reports associations between exposure, reproductive measures, and gene activity; it does not establish the precise mechanism linking them or show whether the observed changes affect later pregnancy or calf health.
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Developmental and transcriptomic alterations in bovine blastocysts derived from oocytes of donors exposed to toxic tall fescue — Ahmed M. Sallam, João Vitor Godoy Takashe, Chanaka A. Rabel et al. — Animal Reproduction Science — doi:10.1016/j.anireprosci.2026.108351
Abstract licence: CC BY
Explanation generated by Synthesis from the abstract — it is not the original paper.