bta-miR-29b: Bta-mir-29b is a down-regulated microRNA that has been identified in various studies in relation to different biological processes. It has been found to be down-regulated in MG-LL and pMEC-LL, suggesting its involvement in lipid metabolism regulation [PMC4783934]. Bta-mir-29b has also been associated with glucose homeostasis and lipid metabolism in cattle [PMC9039951]. In addition, it has been identified as differentially expressed between bulls with different fertility levels [PMC9581129]. Bta-mir-29b has been shown to play a role in host-virus interactions, as it is upregulated upon infection with bovine viral diarrhea virus (BVDV) and can attenuate BVDV infection-related autophagy [PMC5885596]. Furthermore, bta-mir-29b has been found to promote triglyceride production and suppress apoptosis [PMC8027660]. It is also involved in myoblast development and cattle skeletal muscle myogenesis [PMC8847694]. Bta-mir-29b expression levels have been shown to be regulated during pregnancy and the estrous cycle, suggesting its involvement in reproductive processes [PMC5325256]. Additionally, bta-mir-29b expression has been found to be dysregulated in cows with metritis compared to healthy cows [PMC4941693][PMC7832875]. Overall, bta-mir-29b is a versatile microRNA that plays a role in various biological processes.