Intrauterine Platelet-Rich Plasma (PRP) restores fertility in repeat breeder cows by reducing inflammation and bacterial load
Background
Subclinical endometritis (SCE) is a major cause of infertility in dairy cattle, leading to repeat breeding syndrome and significant economic losses. Its often asymptomatic nature makes timely diagnosis and effective intervention challenging, limiting the success of conventional antimicrobial therapy. Concerns about antibiotic resistance and residues in dairy products also drive the search for alternative, antibiotic-free treatments. This study explores platelet-rich plasma (PRP) as an immunomodulatory, regenerative approach to restore uterine homeostasis and fertility, addressing the gap in sustainable SCE management.
Study Design
Researchers evaluated 29 repeat-breeding cows diagnosed with subclinical endometritis (SCE) via endometrial cytobrush cytology (>5% polymorphonuclear neutrophils, PMNs). Cows were randomized into three groups: untreated control, intrauterine cephapirin (500 mg), or intrauterine PRP (25 mL; ≥1×10^6 platelets/µL). Key endpoints assessed included changes in endometrial PMN percentage, uterine bacterial load, pro-inflammatory cytokines (TNF-α and IFN-γ), interval to return to estrus, and overall conception rate. This design aimed to compare PRP's efficacy against a standard antibiotic and an untreated baseline.
Results
Both PRP and antibiotic treatments significantly reduced endometrial PMN counts and inflammatory cytokine concentrations compared with untreated controls (p < 0.05). Intrauterine PRP markedly modulated the uterine inflammatory milieu, demonstrating substantial reductions in TNF-α and IFN-γ, even in animals with negative microbial cultures, highlighting its immune-regulatory action. PRP treatment also resulted in a significant decline in uterine bacterial load, likely mediated through enhanced intrinsic uterine defense mechanisms. No adverse effects on estrus return interval were observed.
Conception rates in PRP-treated cows (50%) were comparable to those achieved with antibiotic therapy and significantly superior to untreated controls.
Key Findings
- Intrauterine PRP significantly reduced endometrial PMN counts and inflammatory cytokine concentrations (TNF-α, IFN-γ) compared to controls (p < 0.05).
- PRP treatment led to a significant decline in uterine bacterial load, comparable to antibiotic therapy.
- PRP achieved a 50% conception rate, similar to antibiotics and superior to untreated controls.
- PRP modulated uterine inflammation and promoted microbial clearance even in culture-negative animals.
- No adverse effects on estrus return interval were observed with PRP treatment.
Why It Matters
This study provides compelling evidence that intrauterine PRP offers an effective, antibiotic-free alternative for treating subclinical endometritis (SCE) in dairy cattle. This could significantly reduce reliance on antimicrobials in livestock, mitigating concerns about antibiotic resistance and residues in the food chain. For farmers and veterinarians, this suggests a new, biologically-driven protocol for improving herd fertility and animal welfare. The finding that PRP is comparable to antibiotics in conception rates and superior to no treatment, without affecting estrus, positions it as a promising first-line or adjunctive therapy, potentially streamlining SCE management and promoting endometrial regeneration.
platelet-rich-plasma
prp
endometritis
infertility
dairy-cattle
inflammation