Effects of Chlortetracycline Rumen-Protected Granules on Rumen Microorganisms and Its Diarrhea Therapeutic Effect

Area of Science:

• Veterinary Medicine
• Microbiology
• Animal Science

Background:

• Chlortetracycline, a broad-spectrum antibiotic, is used orally in ruminants.
• Conventional chlortetracycline administration disrupts the normal rumen microbial population.
• Protecting chlortetracycline in the rumen is crucial for maintaining ruminant health.

Purpose of the Study:

• To evaluate the efficacy of novel rumen-protected chlortetracycline granules against lamb E. coli diarrhea.
• To assess the impact of these granules on rumen microbial populations compared to traditional chlortetracycline premix.
• To determine if the protected granules are less disruptive to rumen microorganisms.

Main Methods:

• Quantitative PCR (qPCR) to quantify specific rumen microorganisms.
• 16S rRNA gene sequencing for bacterial diversity analysis in lamb rumen fluid.
• Therapeutic efficacy trials in naturally E. coli-infected lambs with varying treatment groups.

Main Results:

• Rumen-protected chlortetracycline granules significantly reduced the negative impact on rumen microorganisms compared to chlortetracycline premix.
• qPCR and 16S rRNA sequencing confirmed diminished disruption of rumen microbiota with the granule formulation.
• Oral administration of granules at 30 mg/kg·bw/d for 7 days effectively treated E. coli-induced lamb diarrhea.

Conclusions:

• Rumen-protected chlortetracycline granules offer a viable alternative for treating lamb E. coli diarrhea.
• This new preparation effectively treats infections while mitigating adverse effects on the rumen microbiome.
• The study demonstrates a method to preserve rumen health during antibiotic therapy in ruminants.