Effects of Somatic Cell Count on Quality and Shelf-Life of Pasteurized Fluid Milk

Ma, Yanping; Ryan, C. W.; Barbano, D.M.; Galton, D. A. G.; Rudan, M.A.; Boor, Kathryn J.

doi:10.3168/jds.s0022-0302(00)74873-9

Cited by 227 publications

(219 citation statements)

References 22 publications

Supporting

Mentioning

173

Contrasting

Unclassified

Order By: Relevance

“…Hamann (2002) suggests that an SCC at udder quarter level of up to 100 000 cells/ml should be considered physiologically normal. At cow composite level, it is observed that milk SCC in bacteriologically negative cows was approximately 50 000 cells/ml (Laevens et al, 1997;Ma et al, 2000) and that neither lactation stage nor lactation number affect SCC (Laevens et al, 1997). In this study, average cow composite SCC in Group 1 was 20 000 cells/ml and the average lactation number was 1.2, strengthening the assumption that the cows in Group 1 of our study were healthy.…”

Section: Forsbä Ck Lindmark-må Nsson André N and Svennersten-sjaunjasupporting

confidence: 67%

Evaluation of quality changes in udder quarter milk from cows with low-to-moderate somatic cell counts

Forsbäck

Lindmark-Månsson²,

Andrén

et al. 2010

Animal

View full text Add to dashboard Cite

Much emphasis has been put on evaluating alterations in milk composition caused by clinical and subclinical mastitis. However, little is known about changes in milk composition during subclinical mastitis in individual udder quarters with a low-tomoderate increase in milk somatic cell count (SCC). This information is needed to decide whether milk from individual udder quarters with a moderate-to-high increase in milk SCC should be separated or not. The aim of this study was to determine how milk composition in separate udder quarters is affected when cow composite milk has low or moderately increased SCC levels. Udder quarter and cow composite milk samples were collected from 17 cows on one occasion. Milk yield was registered and samples were analyzed for SCC, fat, total protein, whey proteins, lactose, citric acid, non-protein nitrogen (NPN), lactoferrin, protein profile, free fatty acids (FFAs), lactate dehydrogenase (LDH), proteolysis, sodium and potassium. Bacteriological samples were collected twice from all four quarters of all cows. The cows were divided into three groups depending on their SCC at udder quarter level. The first group comprised healthy cows with four udder quarters with low SCC, , 50 000 cells/ml; composition was equal when opposite rear and front quarters were compared. In the second and the third groups, cows had one udder quarter with 101 000 cells/ml , SCC , 600 000 cells/ml and SCC . 700 000 cells/ml, respectively. The remaining udder quarters of these cows had low SCC (, 100 000 cells/ml). Despite the relatively low average cow composite SCC 5 100 000 cells/ml of Group 2, milk from affected udder quarters exhibited lower casein number, content of lactose and b-casein (b-CN), while the content of whey protein, sodium, LDH and a-lactoalbumin (a-la) were higher compared to healthy opposite quarters. In addition to these changes, milk from affected udder quarters in Group 3 also exhibited lower values of potassium and a s1 -casein (a s1 -CN) and higher values of lactoferrin when compared to milk from opposite healthy quarters. This indicates that even when the SCC in cow composite milk is low, there might exist individual quarters for which milk composition is changed and milk quality impaired.

show abstract

Section: Forsbä Ck Lindmark-må Nsson André N and Svennersten-sjaunjasupporting

confidence: 67%

Evaluation of quality changes in udder quarter milk from cows with low-to-moderate somatic cell counts

Forsbäck

Lindmark-Månsson²,

Andrén

et al. 2010

Animal

View full text Add to dashboard Cite

show abstract

“…Ma et al [43] showed that raw milk quality is lower in high SCC milk than in low SCC milk and also adversely affects the quality of pasteurized milk and decreases its shelf-life. During post-pasteurization cold storage, the rates of free fatty acid increase and casein hydrolysis is significantly high.…”

Section: Pasteurized Milk (Tab Iv)mentioning

confidence: 99%

Polymorphonuclear proteolytic activity and milk composition change

Roux¹,

Laurent²,

Moussaoui³

2003

Vet. Res.

114

View full text Add to dashboard Cite

-Relationships between Quarter Milk Cell Count (QMCC) and Tank Milk Cell Count (TMCC) with milk biochemical and technological parameters in milk and dairy products were investigated. All parameters measured were affected by the increase of TMCC and QMCC between 0 and 600 000 cells/mL. The variable effect of lactation stage which is different for different authors, is discussed. The three mechanisms, measured during the inflammation of the udder, implicated in the modification of milk quality are described (a decrease in synthesis, a decrease in the milk barrier permeability and an increase in proteolytic activities). The direct effect of plasmin in caseinolysis is well known; the specific role of the increase of somatic cells (especially PMN) in the modification of milk quality is described. Several specific proteolytic activities of PMN are described and the impact of these activities on caseinolysis is evaluated. Two hypothetical mechanisms of caseinolysis by PMN are suggested and a synthetic scheme of the role of plasmin, bacteria and somatic cells in caseinolysis is discussed. caseinolysis / mastitis / milk / PMN proteases / SCC

show abstract

“…Ma et al (24) e Ogola et al (25) também observaram aumento de ácidos graxos durante os processos infecciosos da mastite. Leitner et al (26) realizaram estudos sobre a mastite subclínica em ovinos e observaram que a percentagem de gordura era mais baixa em glândulas não infectadas do que nas infectadas, atribuindo esta alteração à redução no volume de leite.…”

Section: Discussionunclassified

COMPOSIÇÃO DO LEITE DE CABRAS SAANEN INFECTADAS EXPERIMENTALMENTE COM Staphylococcus aureus E SUBMETIDAS A DOIS PROTOCOLOS DE TRATAMENTO

et al. 2016

View full text Add to dashboard Cite

Resumo:Neste estudo, objetivou-se avaliar a composição química do leite após a infecção e tratamento da mastite induzida por S. Aureus. Foram utilizadas 10 fêmeas caprinas da raça Saanen. Fez-se a infecção experimental em 20 glândulas mamárias, formando-se quatro grupos experimentais, sendo cada um composto por cinco glândulas mamárias. Um grupo foi tratado com antimicrobiano comercial e outro com pomada à base de extrato natural de planta. Os demais grupos foram constituídos controles. Os valores obtidos para gordura, lactose, proteína, sólidos totais e produção leiteira foram analisados ao longo dos momentos experimentais, comparando-os entre si e entre os grupos experimentais. A mastite foi diagnosticada 24 horas pós inoculação, utilizando-se a lactocultura. Os animais não apresentaram alterações nos parâmetros clínicos avaliados. Para os percentuais de gordura, proteína e sólidos totais, observou-se uma elevação ao longo dos momentos experimentais, sem variação entre os grupos experimentais. Tendo em vista a importância da terapia antimicrobiana convencional e a crescente utilização de antimicrobianos naturais, os resultados obtidos mostram igualdade entre as duas opções terapêuticas, principalmente no aspecto de manutenção dos principais componentes do leite. Palavras-chave: cabras; composição do leite; terapia; mastite. Abstract:This study aimed to evaluate the chemical composition of milk after infection and treatment of mastitis caused by Staphylococcus aureus. Ten Saanen goats were used. Experimental infection was performed in 20 mammary glands, forming four groups, each consisting of five mammary glands. One group was treated with commercial antimicrobial and another with natural plant extract-based ointment. The other groups were constituted as control. The values obtained for fat, lactose, protein, total solids, and milk production were analyzed through the experimental moments, comparing them among each other and between experimental groups. Mastitis was diagnosed by milk microbiology

show abstract

Effects of Somatic Cell Count on Quality and Shelf-Life of Pasteurized Fluid Milk

Cited by 227 publications

References 22 publications

Evaluation of quality changes in udder quarter milk from cows with low-to-moderate somatic cell counts

Evaluation of quality changes in udder quarter milk from cows with low-to-moderate somatic cell counts

Polymorphonuclear proteolytic activity and milk composition change

COMPOSIÇÃO DO LEITE DE CABRAS SAANEN INFECTADAS EXPERIMENTALMENTE COM Staphylococcus aureus E SUBMETIDAS A DOIS PROTOCOLOS DE TRATAMENTO

Contact Info

Product

Resources

About