RESUMEN
Ewes treated by intramammary infusion of cephapirin benzathine at the end of lactation were less likely to develop new intramammary infections by early in the next lactation. A controlled clinical trial involving 135 treated ewes and 145 untreated control ewes evaluated the prophylactic and treatment efficacy of intramammary antibiotic treatment of ewes at the time of weaning lambs. Milk samples for bacteriologic examination and identification of intramammary infections were collected at weaning of lambs and 1 to 3 weeks into the subsequent lactation. Untreated ewes were 2.6 times more likely than treated ewes to develop new intramammary infections between sampling times. Existence of an intramammary infection in one mammary gland significantly increased the risk of the other mammary gland becoming infected. Treatment also appeared to be associated with a higher cure rate of existing infections.
Asunto(s)
Cefalosporinas/uso terapéutico , Cefapirina/uso terapéutico , Mastitis/veterinaria , Enfermedades de las Ovejas/prevención & control , Animales , Cefapirina/administración & dosificación , Ensayos Clínicos como Asunto/veterinaria , Femenino , Estudios de Seguimiento , Infusiones Parenterales/veterinaria , Lactancia , Mastitis/tratamiento farmacológico , Mastitis/prevención & control , Leche/microbiología , Embarazo , Ovinos , Enfermedades de las Ovejas/tratamiento farmacológico , Infecciones Estafilocócicas/tratamiento farmacológico , Infecciones Estafilocócicas/prevención & control , Infecciones Estafilocócicas/veterinariaRESUMEN
Serratia liquefaciens mastitis was detected and investigated in a 41-cow Holstein herd. Twenty cows were treated for mastitis over a 3-month period. Serratia liquefaciens was isolated from milk samples obtained from 8 of 12 cows tested during the epizootic. Results of an epidemiologic investigation suggested that extensive frostbite of the teats decreased the udder defense. Poor milking technique and hygiene were responsible for increased exposure of the damaged teats to potential udder pathogens. Treatment of each cow resulted in initial clinical improvement, but exacerbations occurred in 75% of the cows with documented S liquefaciens infections.