Subclinical mastitis affects the plasmin system, milk composition and curd yield in sheep and goats: comparative aspects

Nissim Silanikove; Fira Shapiro; Gabriel Leitner; Uzi Merin

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Subclinical mastitis affects the plasmin system, milk composition and curd yield in sheep and goats: comparative aspects

in Mastitis in dairy production

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Nissim Silanikove

Nissim Silanikove

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Fira Shapiro

Fira Shapiro

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Gabriel Leitner

Gabriel Leitner ²National Mastitis Reference Center, Kimron Veterinary Institute, Bet Dagan, Israel

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Uzi Merin

Uzi Merin ³Dairy Science Laboratory, Institute of Technology and Storage of Agricultural Products, Agricultural Research Organization, the Volcani Center, Bet Dagan, Israel

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Art:: Kapitel

Seiten:: 511–516

DOI:: https://doi.org/10.3920/9789086865505_077

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Subclinical mastitis in dairy sheep and goats has major deleterious effects on both the yield and the quality of milk. Improved insight into the interaction between bacteria and the affected gland was achieved by comparing infected and uninfected glands in the same animal. Lower concentration of lactose in the infected glands was associated with higher whey and albumin concentrations. In both sheep and goats curd yields from the infected halves were lower than those from the uninfected ones, although casein concentrations were almost equal in the two glands. It is likely that modifications in the casein micelles, caused by bacterial activity, are more detrimental to curd formation than to casein formation; this is also indicated by the longer clotting time of milk in the infected glands. Plasmin, the major proteolytic enzyme, in milk exists mostly as inactive plasminogen, and is activated by plasminogen-activator. Beta-casein is a natural substrate of plasmin, and a beta-casein-derived peptide down-regulates milk secretion. In goats, plasminogen activity was close to zero, possibly because of unusually high plasminogen-activator activity. The higher casein content, together with the higher plasmin activity, in sheep than in goats resulted in higher contents of casein degradation products, which include factors that downregulate lactose and milk secretion. The higher degradation of casein explains the higher loss of curd and the lower milk yield in response to bacterial infection, in sheep than in goats.

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Mastitis in dairy production

Current knowledge and future solutions

ISBN:: 9789086865505

Verleger:: Wageningen Academic

Print-Publikationsdatum:: 24 Oct 2005

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Subclinical mastitis affects the plasmin system, milk composition and curd yield in sheep and goats: comparative aspects

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Mastitis in dairy production

Current knowledge and future solutions

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