Co-Authors:
Leitner, G., National Mastitis Reference Center, Kimron Veterinary Institute, P.O. Box 12, Bet Dagan 50250, Israel
Koren, O., Hachaklait Veterinary Services Ltd, Israel
Jacoby, S., Institute of Animal Science, Institute of Technology and Storage of Agricultural Products, A.R.O. The Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Merin, U., Institute of Animal Science, Institute of Technology and Storage of Agricultural Products, A.R.O. The Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Silanikove, N., Institute of Animal Science, Institute of Technology and Storage of Agricultural Products, A.R.O. The Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Abstract:
Subclinical mastitis is the predominant form of mastitis in modern cow herds, and greatly affects dairy economics. The aim of the present study was to exploit available on-line computerized data to suggest a rational procedure that would enable effective treatment of infected udders. The cows were divided into five categories: no intervention, antibiotic treatment, drying-off specific quarter(s) with casein hydrolyzate, drying-off the whole cow and culling. The first step in the analysis was identification of the infected udder and the causative pathogen. The second step was to determine the sensitivity of the pathogen (mostly bacteria) to antibiotic treatment. Of the 62 high somatic cell count (SCC) cows, 40 (64.5%) were cured. The highest cure was achieved in mammary glands infected with Streptococcus dysgalactiae, followed by those with Staphylococcus chromogenes. No differences were found for the cure of cows in their first to third lactations but were significantly lower in lactations 4 and 5. When treatment was applied within a month from the estimated occurrence of the infection, the success rate was over 73%, whereas treatment after 3 months or more achieved significantly lower success. The average SCC towards the time of antibiotic treatment was about 1.5 x 106 cells ml/-1. At first milk testing, aboutl month after treatment, SCC was at a level of aboutl00,000 cells ml/-1 and it remained at that level for the subsequent 3 months. The 17 cows that underwent drying-off of a single infected gland had SCC > 106 cells ml/-1 for at least 3 months. Drying off of the secretion from the infected glands reduced the overall SCC to < 200,000 cells ml/-1. Milk yield from the uninfected three quarters decreased on average by about 9% during 30 days post-treatment. Treatment options of subclinical mastitis according to the results require early detection, identification of the bacterium and calculation of the economic benefit, taking into account the conditions and the value of the animal to the farmer.
תפריט נגישות
ניגודיות עדינה
מונוכרום
הדגשת קישורים
חסימת אנימציה
פונט קריא
סגור
איפוס הגדרות נגישות
להורדת מודול נגישות חינם
