Abstract
Bovine Serum Albumin (BSA) concentration in quarter milk samples from 51 cows examined twice, at 1½ months intervals, was related to subclinical mastitis diagnoses and to the change in diagnoses from the first to the second examination. The BSA-concentration increased with increasing scores of the California Mastitis Test (CMT). The concentration of BSA was higher if bacteria were isolated as compared to negative bacteriological findings, and it was higher if “major pathogens” (MaP) (Staphylococcus aureus or Streptococcus dysgalactiae) rather than “minor pathogens” (MiP) (S. epidermidis or α-streptococci) were isolated. There was no interaction in the “effects” of CMT-score and bacteria on BSA-concentration. Quarters which were healthy and pathogenfree at first examination and had a non-specific mastitis at the subsequent examination, had significantly higher BSA-concentration at first examination than those which remained healthy. Quarters with non-specific mastitis at the first examination and infectious mastitis at the next examination had higher BSA-concentration at the first examinition than those which turned out with other diagnoses. Quarters with infectious mastitis and MaP at first examination which had a latent infection at the next testing, had a lower BSA-concentration than those with other second examination diagnosis. In general, BSA seems to be a more sensitive parameter than CMT for showing the early establishment of an inflammatory reaction in the alveolar tissue.
Keywords: CMT, bacteria, diagnostic methods, prognosis, laboratory methods, bovine serum albumin, udder health, major pathogens, minor pathogens
Sammendrag
Speneprøver fra 51 kyr uttatt med 1½ måneds mellomrom ble undersøkt med henblikk på mulig subklinisk mastitt og for innhold av bovint serumalbumin (BSA). Det var et økende innhold av BSA med økende celletall vurdert med California Mastitis Test (CMT). BSA-innholdet i bakteriologisk positive prøver var høyere enn tilsvarende i bakteriologisk negative prøver. I prøver hvorfra Staphylococcus aureus eller Streptococcus dysgalactiae ble isolert, fantes høyere innhold av BSA sammenlignet med prøver hvorfra S. epider-midis eller α-streptococcer ble isolert. Det var ingen samspilleffekt mellom CMT-resultatet og bakterietype på BSA-konsentrasjonen.
BSA ved første undersøkelse for kjertier som var friske både ved første og andre gangs undersøkelse, var lavere sammenlignet med tilsvarende kjertier som var friske første gang og som andre gang hadde mastitt uten funn av bakterier (mastitt). BSA ved første undersøkelse for kjertier som første gang hadde mastitt og andre gang hadde infeksiøs mastitt, var høyere enn tilsvarende for kjertier som første gang hadde mastitt og som andre gang hadde andre diagnoser enn infeksiøs mastitt.
Generelt synes BSA å være et parameter som avdekker en beten-nelsestilstand i juret på et tidlig tidspunkt.
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