Associations between Milk Coagulation Properties and Microbiological Quality in Sheep Bulk Tank Milk

Author:

Arias Ramón1ORCID,Jiménez Lorena1ORCID,Garzón Ana2ORCID,Caballero-Villalobos Javier2ORCID,Oliete Bonastre3,Amalfitano Nicolò4ORCID,Cecchinato Alessio4ORCID,Perea José M.2ORCID

Affiliation:

1. Instituto Regional de Investigación y Desarrollo Agroalimentario y Forestal de Castilla-La Mancha (IRIAF), CERSYRA de Valdepeñas, 13300 Ciudad Real, Spain

2. Departamento de Producción Animal, Universidad de Córdoba, 14071 Córdoba, Spain

3. Institut Agro, Université Bourgogne Franche-Comté, PAM UMR A 02.102, 21000 Dijon, France

4. Department of Agronomy, Food, Natural Resources, Animals and Environment (DAFNAE), University of Padova, Viale dell’Università 16, Legnaro, 35020 Padova, Italy

Abstract

This study conducted a seasonal analysis of bulk tank milk from 77 sheep farms to establish relationships between the concentration of major microbial groups and milk coagulation properties. The investigated milk traits included composition (pH, fat, casein, lactose), coagulation properties (curd firmness: A60-, rennet clotting time: RCT-, curd firming time: k20-, curd yield: CY-), and somatic cell score (SCS). The main microbial groups analyzed were total mesophilic bacteria (SPC), thermodurics (THERMO), psychrotrophs (PSYCHRO), Pseudomonas spp. (PSEUDO), lactic acid bacteria (LAB), catalase-negative gram-positive cocci (GPCNC), Escherichia coli (ECOLI), coliforms other than Escherichia coli (COLI), coagulase-positive staphylococci (CPS), coagulase-negative staphylococci (CNS), and spores of lactate-fermenting Clostridium (BAB). Mixed linear models were used to explore associations between coagulation properties and the aforementioned variables. Results demonstrated that incorporating microbial loads into the models improves their fit and the relative quality of the outcomes. An important seasonality is demonstrated by an increase in CY and A60, along with a decrease in RCT and k20 during autumn and winter, contrasting with spring and summer. BAB concentration resulted in a reduction of A60 and an increase in RCT, whereas SPC concentration led to an enhancement of A60 and a reduction in RCT. An increase in GPCNC concentration was associated with an increase in k20 and a decrease in CY.

Funder

National Institute of Research and Agrarian and Food Technology—INIA (Government of Spain) as part of the project

Publisher

MDPI AG

Reference44 articles.

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