geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Influence of the lactoperoxidase system on susceptibility of the udder to Streptococcus uberis infection


, : Influence of the lactoperoxidase system on susceptibility of the udder to Streptococcus uberis infection. Journal of Dairy Research 53(4): 507-514

Lactoperoxidase (LP), thiocyanate (SCN-), pH and somatic cell counts (SCC) were measured in mammary secretions from 20 cows collected 14 d before drying-off, 7 and 21 d after drying-off, and 3-18 d postcalving. The inhibitory activity of the secretions on Streptococcus uberis was determined and the susceptibility of the udder to infection by this organism was tested by intramammary infusion of 250 colony forming units at the above stages. LP, SCN-, pH and SCC increased during involution and fell postcalving. The secretions collected before drying-off, 7 d after drying-off and postcalving inhibited growth of Str. uberis.; those collected 21 d after drying-off did not. Inhibitory activity in pre-drying-off secretions was destroyed by heating and restored by addition of LP, glucose and glucose oxidase, but addition of these substances to secretion 21 d after drying-off did not provide a full inhibitory system. The growth of Str. uberis in the secretions was correlated with intramammary susceptibility, since challenges with Str. uberis at 14 d before drying-off, at 7 and 21 d after drying-off and postcalving led to 43.8, 25.0, 81.3 and 37.5% of quarters becoming infected. It is suggested that the LP/SCN-/H2O2 system plays a role in protecting the lactating mammary gland from infection with Str. uberis but becomes ineffective as involution progresses.

US$19.90

PMID: 3794018

DOI: 10.1017/s0022029900033033


Other references

Syrrist, G., 1962: Economic effects of the seasonal variations in the delivery of milk to dairies in Norway. II. Some effects of the seasonally in the butter production. A preliminary study. Four models were designed to study the effects of seasonality of butter production, i.e. 2 transportation models, a combined inventory and transportation model and a network model. The network model was superior and it was possible to reduce the p...

Giammarioli, M.; Bazzucchi, M.; Puggioni, G.; Brajon, G.; Dei Giudici, S.; Taccori, F.; Feliziani, F.; D.M.a, G.M., 2012: Phylogenetic analysis of small ruminant lentivirus (SRLV) in Italian flocks reveals the existence of novel genetic subtypes. In order to investigate the genetic heterogeneity of small ruminant lentivirus (SRLV) isolates in Italy, 55 clinical samples collected between 1998 and 21 were analysed. The phylogenetic study was based on analysis of <i>gag pol</i> se...

Petyk, Jason, 2004: Predation of a golden-cheeked warbler nest by a western scrub-jay. I observed a Western Scrub-Jay (Aphelocomo californica) consume a Golden-cheeked Warbler (Dendroica chrysoparia) nestling and a Brownheaded Cowbird (Molothrus ater) nestling in northwestern Travis County, Texas, in May 1995. During a 4.5-hr period...

Small, S.R.; Berend, M.E.; Ritter, M.A.; Buckley, C.A.; Rogge, R.D., 2012: Metal backing significantly decreases tibial strains in a medial unicompartmental knee arthroplasty model. Clinical success of unicompartmental knee arthroplasty (UKA) is on the rise and is dependent on multiple patient, implant, and surgical factors. Tibial subsidence has been clinically reported as a cause of failure in UKA with an all-polyethylene t...

Nichols, SW., 1988: Systematics and biogeography of West Indian Scaritinae (Coleoptera: Carabidae). Dissertation Abstracts International B Sciences and Engineering, 4812: 3489

Borisov L.B., 1981: Mechanisms for the formation of o antigens and k antigens in escherichia coli and its entero pathogenic varieties. Zhurnal Mikrobiologii Epidemiologii i Immunobiologii (5): 17-23

Kämppi, L.; Mustonen, H.; Soinila, S., 2014: Analysis of the delay components in the treatment of status epilepticus. The factors comprising the delays in management of status epilepticus (SE) have not been systematically studied.We studied retrospectively all adult patients (<em>N</em> = 82) diagnosed with SE in Helsinki University Central Hospital e...

Saito, I.; Itsuji, S.; Takeshita, E.; Takenaka, T.; Furukawa, T.; Saruta, T.; Nagano, S.; Sekihara, T., 1989: Increased sympathetic nerve activity at home in young subjects with hypertension. Plasma and urine norepinephrine, epinephrine, plasma renin activity and aldosterone were measured in 11 young men (mean age, 21 years) with a high blood pressure in the clinic who maintained a high home blood pressure and 12 men with an elevated c...

Hudson, P.L.; Kristjanson, L.J.; Ashby, M.; Kelly, B.; Schofield, P.; Hudson, R.; Aranda, S.; O'Connor, M.; Street, A., 2006: Desire for hastened death in patients with advanced disease and the evidence base of clinical guidelines: a systematic review. Patients' desire for hastened death within the context of advanced disease and palliative care is a controversial topic, frequently discussed in the international literature. Much of the discussion has focused on opinion and debate about ethi...

Nolan, G.; Walsh, E., 2013: Caring in prison: the intersubjective web of professional relationships. In this paper, we present a synthesis of two doctoral theses where links are made between the intersubjective, relational dynamics seen in clinical supervision, and applied in practice to a framework for emotional labor in prison nurses. We explor...