Relationship among specific bacterial counts and total bacterial and somatic cell counts and factors influencing their variation in ovine bulk tank milk
| Autor: | Jesús Santos, L.F. de la Fuente, J.A. Carriedo, M.L. de Garnica, B. Linage, M.C. García-Jimeno, Carlos Gonzalo |
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| Rok vydání: | 2013 |
| Předmět: |
Veterinary medicine
Food storage Cell Count Biology medicine.disease_cause Milking fluids and secretions Food Quality Genetics medicine Animals Bulk tank Sheep business.industry food and beverages Bacterial Load Breed Biotechnology Milk Food Storage Psychrotrophic bacteria Female Animal Science and Zoology Seasons Flock business Food quality Somatic cell count Food Science |
| Zdroj: | Journal of Dairy Science. 96:1021-1029 |
| ISSN: | 0022-0302 |
| DOI: | 10.3168/jds.2012-5915 |
| Popis: | To analyze the relationship among the counts of different organisms and total bacterial count (BTTBC) and somatic cell count (BTSCC) as determined in dairy laboratories in ovine bulk tank milk, 751 bulk tank milk samples from 205 dairy sheep flocks belonging to Consortium for Ovine Promotion (CPO) were collected between January and December 2011. Four samplings were carried out in each flock, once per season, throughout 1 yr. Variables analyzed were bulk tank counts of thermoduric, psychrotrophic, coliform, and gram-positive catalase-negative cocci (GPCNC) bacterial groups. Thermoduric, psychrotrophic, and coliform species were significantly related to BTTBC, whereas GPCNC were correlated with both BTTBC and BTSCC variables. Highest counts were for psychrotroph and coliform groups, and a moderate to high correlation (r=0.51) was found between both variables, indicating that poor cleaning practices in the flocks tend to select for less-resistant organisms, such as gram-negative rods. In addition, BTTBC correlated with BTSCC (r=0.42). Some variation factors for specific bacterial counts, such as breed, season, milking type, dry therapy, and milk yield, were also analyzed. Flock information was collected from flock books, annual audits, and the CPO traceability system. Psychrotrophs and coliforms had elevated counts in winter, whereas GPCNC were higher in summer and in hand-milked flocks. Dry therapy contributed to the reduction in psychrotrophic bacteria; therefore, some strains of mammary pathogens could also be psychrotrophic bacteria. Results of this study would be helpful for troubleshooting milk quality problems and developing premium payment systems in dairy sheep. |
| Databáze: | OpenAIRE |
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