Effect of somatic cell count and mastitis pathogens on milk composition in Gyr cows

BMC Veterinary Research

Marcos Veiga dos Santos¹  Marco Aurélio de Felício Porcionato¹  Lucinéia Mestieri¹  Juliana Regina Barreiro¹  Carolina Barbosa Malek dos Reis¹ 

[1] Department of Nutrition and Animal Production, School of Veterinary Medicine and Animal Sciences, University of São Paulo, Pirassununga, Brazil

关键词: Milk composition;    Mastitis;    Gyr cows;    Somatic cell count;   

Others  :  1119571
DOI  :  10.1186/1746-6148-9-67

 received in 2012-03-16, accepted in 2013-03-27,  发布年份 2013

【 摘 要 】

Background

Gyr cows are well adapted to tropical conditions, resistant to some tropical diseases and have satisfactory milk production. However, Gyr dairy herds have a high prevalence of subclinical mastitis, which negatively affects their milk yield and composition. The objectives of this study were (i) to evaluate the effects of seasonality, mammary quarter location (rear x front), mastitis-causing pathogen species, and somatic cell count (SCC) on milk composition in Gyr cows with mammary quarters as the experimental units and (ii) to evaluate the effects of seasonality and somatic cell count (SCC) on milk composition in Gyr cows with cows as the experimental units. A total of 221 lactating Gyr cows from three commercial dairy farms were selected for this study. Individual foremilk quarter samples and composite milk samples were collected once a month over one year from all lactating cows for analysis of SCC, milk composition, and bacteriological culture.

Results

Subclinical mastitis reduced lactose, nonfat solids and total solids content, but no difference was found in the protein and fat content between infected and uninfected quarters. Seasonality influenced milk composition both in mammary quarters and composite milk samples. Nevertheless, there was no effect of mammary quarter position on milk composition. Mastitis-causing pathogens affected protein, lactose, nonfat solids, and total solids content, but not milk fat content. Somatic cell count levels affected milk composition in both mammary quarters and composite samples of milk.

Conclusions

Intramammary infections in Gyr cows alter milk composition; however, the degree of change depends on the mastitis-causing pathogen. Somatic cell count is negatively associated with reduced lactose and nonfat solids content in milk. Seasonality significantly affects milk composition, in which the concentration of lactose, fat, protein, nonfat solids and total solids differs between dry and wet seasons in Gyr cows.

【 授权许可】

   
2013 Malek dos Reis et al.; licensee BioMed Central Ltd.

【 参考文献 】

• [1]Dobranié V, Njari B, Samardžija M, Mioković B, Resanović R: The influence of the season on the chemical composition and the somatic cell count of bulk tank cow’s milk. Vet Arhiv 2008, 78:235-242.
• [2]Allen MS: Effects of diet on short-term regulation of feed intake by lactating dairy cattle. J Dairy Sci 2000, 83:1598-1624.
• [3]Halasa T, Huijps K, Osteras O, Hogeveen H: Economic effects of bovine mastitis and mastitis management [a review]. Vet Q 2007, 29:18-31.
• [4]Santos MV, Ma Y, Barbano DM: Effect to somatic cell count on proteolysis and lipolysis in pasteurized fluid milk during shelf-life storage. J Dairy Sci 2003, 86:2491-2503.
• [5]Cunha RPL, Molina LR, Carvalho AU, Facury Filho EJ, Ferreira PM, Gentilini MB: Subclinical mastitis and relationship between somatic cell count with number of lactations, production and chemical composition of milk. Arq Bras Med Vet Zoo 2008, 60:19-24.
• [6]Kitchen BJ: Review of the progress of dairy science: Bovine mastitis: milk compositional changes and related diagnostic tests. J Dairy Res 1981, 48:167-188.
• [7]Dohoo L, Smith R, Andersen S, Kelton DF, Godden S: Diagnosing intramammary infections: Evaluation of definitions based on a single milk sample. J Dairy Sci 2011, 94:250-261.
• [8]Schukken YH, Wilson DJ, Welcome F, Garrison-Tinofsky L, Gonzales RN: Monitoring udder health and milk quality using somatic cell counts. Vet Res 2003, 34:579-596.
• [9]Ballou LU, Pasquini M, Bremel RD, Everson T, Dean Somme RD: Factors affecting herd milk composition and milk plasmin at four levels of somatic cell counts. J Dairy Sci 1995, 78:2186-2195.
• [10]Souza EM, Milagres JC, Regazzi AJ, Martinez ML, Silva MA: Effects of genetic and environmental factors on milk production of dairy Gir cattle in Brazil. Rev Bras Zootec 1996, 25:889-901.
• [11]Fonseca I, Silva PV, Lange CC, Guimarães MFM, Weller M, Sousa KRS, Lopes PS, Guimarães JD, Guimarães SEF: Expression profile of genes associated with mastitis in dairy cattle. Genet Mol Biol 2009, 32:776-781.
• [12]Porcionato MAF, Soares WVB, Malek dos Reis CB, Cortinhas CS, Mestieri L, Santos MV: Milk flow, teat morphology and subclinical mastitis prevalence in Gir cows. Pesq Agropec Bras 2010, 45:1507-1512.
• [13]Malek dos Reis CB, Barreiro JR, Moreno JFG, Porcionato MAF, Santos MV: Evaluation of somatic cell count thresholds to detect subclinical mastitis in Gyr cows. J Dairy Sci 2011, 94:4406-4412.
• [14]Pyörälä S: Indicators of inflammation in the diagnosis of mastitis. Vet Res 2003, 34:564-578.
• [15]Bansal BK, Hamann J, Grabowski N, Singh KB: Variation in the composition of selected milk fraction samples from healthy and mastitis quarters, and its significance for mastitis diagnosis. J Dairy Res 2005, 72:144-152.
• [16]Forsbäck L, Lindmark-Mansson H, Andrén A, Svennersten-Sjaunja K: Evaluation of quality changes in udder quarter milk from cows with low-to-moderate somatic cell count. Animal 2010, 4:617-626.
• [17]Rogers SA, Mitchell GE, Bartley JP: The relationship between somatic cell count, composition and manufacturing properties of bulk milk 4 – non-protein constituents. Aust J Dairy Tech 1989, 44:53-56.
• [18]Auldist MJ, Coats S, Rogers GL, Mcdowell GH: Changes in the composition of milk from healthy and mastitic dairy cows during lactation cycle. Aust J Exp Agr 1995, 35:427-436.
• [19]Mitchell GE, Rogers SA, Houlihan DB, Tucker VC, Kitchen BJ: The relationship between somatic cell count, composition and manufacturing properties of bulk milk. I. Composition of farm bulk milk. Aust J Dairy Tech 1986, 41:9-12.
• [20]Berglund I, Pettersson G, Ostensson K, Svennersten-Sjaunja K: Quarter Milking for improved detection of increased SCC. Reprod Domest Anim 2007, 42:427-432.
• [21]Sharif A, Muhammad G: Somatic cell count as an indicator of udder health status under modern dairy production [a review]. Pakistan Vet J 2008, 28:194-200.
• [22]Le Roux Y, Laurent F, Moussaoui F: Polymorphonuclear proteolytic activity and milk composition change. Vet Res 2003, 34:629-645.
• [23]Ogola H, Shitandi A, Nanua J: Effect of mastitis on raw milk composition quality. J Dairy Sci 2007, 8:237-242.
• [24]Bentley 2000: Operator`s manual. Chasca; 1995:77.
• [25]Hogan JS, Gonzalez RN, Harmon RJ, Nickerson SC, Oliver SP, Pankey JW, Smith KL: Laboratory Handbook on Bovine Mastitis (revised edition). Madison, WI: National Mastitis Council; 1999.