Lipoprotein Lipase Activity of Milk from Cows with Prolonged Subclinical Mastitis

Azzara, C. Daniel; Dimick, Paul S.

doi:10.3168/jds.s0022-0302(85)81223-6

Cited by 40 publications

(28 citation statements)

References 24 publications

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“…Decreases in fat contents of infected quarters were expected due to either a decreased synthesis of fat globules by the damaged tissue (Almeida et al 1996) or to increased lipolytic activity triggered by host defense enzymes (Azzara and Dimick 1985). However, fat content reduction was not evidenced in our study.…”

Section: Discussionmentioning

confidence: 80%

Staphylococcus aureus intramammary infection affects milk yield and SCC of dairy cows

Botaro

Cortinhas

Dibbern

et al. 2014

Trop Anim Health Prod

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Staphylococcus aureus (S. aureus) is the most prevalent infectious microorganism affecting dairy cattle worldwide, and its pathogenic characteristics facilitate its spread in dairy herds. S. aureus intramammary infections (IMI) are mainly subclinical, and associated losses can exceed average herd losses where the pathogen is not isolated. However, the extent it affects milk composition at udder and quarter levels is still unknown, and cow composite milk losses may be underestimated due to the dilution effect. The aim of this study was to investigate the effects of S. aureus subclinical mastitis on mammary quarter milk yield and composition. In order to determine the effects of the pathogen on milk yield and composition at quarter level, a pairwise comparison of infected and non-infected mammary quarters (n = 28) from two dairy herds was carried out. Quarters were individually milked, and milk production and composition were assessed. S. aureus has increased somatic cell counts at quarter level; however, no effect of S. aureus IMI on milk lactose, fat, and protein contents was observed. Fat yield from infected quarters decreased, but losses due to the infection caused by S. aureus were not associated with quarter positioning in cows.

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Section: Discussionmentioning

confidence: 80%

Staphylococcus aureus intramammary infection affects milk yield and SCC of dairy cows

Botaro

Cortinhas

Dibbern

et al. 2014

Trop Anim Health Prod

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“…This may be explained by the alteration of the milk fat globule membrane by leucocyte lipases or by plasmin through the hydrolysis of lipoproteins, both of which may enhance lipolysis. Nevertheless, results regarding lipoprotein lipase activity in mastitic milk are also contradictory: some authors found that its activity increased (Azzara and Dimick 1985b;Erwin and Randolph 1975;Randolph and Erwin 1974;Tallamy and Randolph 1970) during mastitis while others found that it decreased (Anderson 1982;Fitz-Gerald et al 1981) or found no significant differences (Salih and Anderson 1979). Altogether these results appear somehow conflicting and it is difficult if not impossible to draw a clear conclusion upon the impact of high SCC on milk composition for most parameters.…”

Section: Changes In Milk Associated With a Rise In The Scc And Variatmentioning

confidence: 72%

Mastitis impact on technological properties of milk and quality of milk products—a review

Maréchal

Thiéry²,

Vautor

et al. 2011

Dairy Science & Technol.

148

139

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The consequences of mastitis on the technological properties of milk and on the quality of milk products are widely reported in the literature. Besides, recent advances have shed light on the mechanisms involved in the udder response and subsequent milk changes in mastitis cases. This review gives an update on the literature regarding the impact of mastitis on milk composition and processing properties and collates recent data regarding the mechanisms involved in mastitis effects. It is an attempt to link field observations and experimental studies in order to better understand how mastites affect so dramatically the technological properties of milk. Both bovine and small ruminant milks are considered and a special emphasis is given on the role of staphylococci, streptococci, and Escherichia coli, the most common causative agents of mastitis.

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“…According to Losses in milk production and quality due to milk somatic cell count and heats stress of Holsteins cows in temperate climate Azzara and Dimmick (1985), higher SCC leads to a decrease in fat synthesis, due to damage in the secretory epithelium and lipolytic or proteolytic activity of leukocyte enzymes. However, lower milk production can result in higher fat concentration, which may explain the results up until SCS 1, at which point the fat levels decreased.…”

Section: Resultsmentioning

confidence: 99%

Losses in milk production and quality due to milk somatic cell count and heat stress of Holsteins cows in temperate climate

et al. 2015

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The aims of present study were to evaluate the effects of milk somatic cell count (SCC) and heat stress on yield and milk composition of cows in a herd for commercial production in a temperate region during the period [2008][2009][2010][2011][2012]. Data from the monthly milk test-day records of 161±9 Holstein, totaling 9,650 milkings, were provided by the Association of Holstein Cattle Breeders of Parana State, and analyzed by descriptive analysis, correlation, analysis of variance, and regression analysis. The average daily milk yield was 31.78 kg/cow, which decreased to 29.31% when the somatic cell score (SCS) was 9, and to 11% when the Equivalent Temperature Index (ETI) was 32 or above. Lactose content decreased from SCS 0 until 9 and fat content decreased from SCS 1 until 9, totaling decrease 7.88 and 9.23%, respectively, when the SCS was 9. An opposite effect was observed for the protein content, which increased by 3.6% at SCS 8, when compared to SCS 0. Losses were observed in the daily total solids production from the SCS 0, totaling 30.64% at SCS 9.The increase in ETI to 32 or above reduced all milk constituents as much as 3.42%, except protein. These results, combined with the losses in milk yield at that ETI level, led to a decrease of up to 12.74% of milk solids. It is concluded that since losses in milk quality and yield resulting from SCC and ETI are significant, actions to prevent infection in the mammary gland and to provide a comfortable environment for dairy cattle are needed even in temperate regions. ResumoO objetivo deste estudo foi avaliar a influencia da contagem de células somáticas (CCS) no leite e o estresse térmico sobre a produção e composição do leite de vacas de um rebanho de produção comercial em região de clima temperado, durante o período de 2008 a 2012. Os dados do dia de controle leiteiro de 161±9 vacas Holandesas, totalizando 9650 ordenhas, foram fornecidos pela Associação Paranaense de Criadores de Bovinos da Raça Holandesa e analisados através de estatística descritiva, correlação, análise de variância e regressão. A produção média diária de leite foi de 31,78 kg/vaca, com diminuição de 29,31% quando o escore de contagem de células somáticas (ECS) foi 9 e até 11% quando o Índice de Temperatura Equivalente (ITE) foi 32 ou maior. Os teores de lactose decresceram a partir do ECS 0 até 9 e de gordura a partir de ECS 1 até 9, totalizando diminuição de 7,88 e 9,23%, respectivamente, quando o ECCS foi 9. Um efeito inverso foi observado em relação ao teor de proteína, o qual aumentou 3,6% com ECS 8, comparado com o ECS 0. A produção diária de sólidos totais iniciou perdas a partir do ECS 0 e totalizou perdas de 30,64% quando este foi 9. O aumento do ITE até 32 ou mais diminuiu a concentração de todos os componentes do leite, exceto de proteína, em valores de até 3,42% da concentração. Estes efeitos, somados a diminuição na produção diária de leite com este nível de ITE, totalizaram perdas de até 12,74% na produção de sólidos totais. Conclui-se que as perdas de produção e qua...

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Lipoprotein Lipase Activity of Milk from Cows with Prolonged Subclinical Mastitis

Cited by 40 publications

References 24 publications

Staphylococcus aureus intramammary infection affects milk yield and SCC of dairy cows

Staphylococcus aureus intramammary infection affects milk yield and SCC of dairy cows

Mastitis impact on technological properties of milk and quality of milk products—a review

Losses in milk production and quality due to milk somatic cell count and heat stress of Holsteins cows in temperate climate

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