doctor holding a syringe against the background of cows in the barn concept of growth hormone and antibiotics in beef, bacteria

acceleration animal antibiotic aureus bacillus bacteria beef biology bossy breeding cattle cereus coli concept cows danger drug exciter farm growth health hormones husbandry incubator industry infections injection kine klebsiella lustiness malignant meat medicine microbes microflora morbific neat nitrates nosogenic pathogen pathogenic pneumoniae quality raising requirements sanitary standards staphylococcus stock sun sunset superbugs tetracycline threat veterinary