אסיף מאגר המחקר החקלאי

Effect of subclinical intramammary infection on somatic cell counts, NAGase activity and gross composition of goats' milk

Year:

2004

Source of publication :

Authors :

Volume :

71

Co-Authors:

Leitner, G., National Mastitis Reference Centre, Kimron Veterinary Institute, Israel
Merin, U., Department of Food Science, Inst. Technol. Storage Agric. Prod., Israel
Silanikove, N., Department of Animal Physiology, Institute of Animal Science, Volcani Centre, Israel
Ezra, E., Israel Cattle Breeders Association, Caesarea, Israel
Chaffer, M., National Mastitis Reference Centre, Kimron Veterinary Institute, Israel
Gollop, N., Department of Food Science, Inst. Technol. Storage Agric. Prod., Israel
Winkler, M., National Mastitis Reference Centre, Kimron Veterinary Institute, Israel
Glickman, A., National Mastitis Reference Centre, Kimron Veterinary Institute, Israel
Saran, A., National Mastitis Reference Centre, Kimron Veterinary Institute, Israel

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Abstract:

The study was aimed at identifying the pathogens causing subclinical udder infections in representative Israeli dairy goat herds and determining their effect on milk quality. Five hundred goats in ten flocks of various breeds and crossbreeds were surveyed. Of the 500 goats, 13.4% were in their first lactation, 36.4% were in their second lactation and 50.2% were in their third or higher lactation. Percentages of udder halves with subclinical intramammary infection in the flocks ranged from 35 to 71%. The effect of the bacteriological infection on somatic cells count (SCC) was significant (P<0.001). Various species of coagulase-negative staphylococci (CNS), mainly Staphylococcus caprae and Staphylococcus epidermidis, were the main pathogens in infected udder halves. Lactation number did not significantly influence either infection rate of udder halves or SCC, although the percentage of udder halves with no bacteriological findings was higher at the first lactation than at the third lactation. Milk composition (fat, protein and lactose) varied among flocks, with lower mean total protein in uninfected halves than in infected ones and higher lactose in uninfected than infected halves.

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