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1 National Mastitis Reference Center, Kimron Veterinary Institute, Bet Dagan 50250, Israel
2 Department of Food Science, Institute of Technology and Storage of Agricultural Products and,
3 Ruminant Physiology, Institute of Animal Science, Agricultural Research Organization, The Volcani Center, Bet Dagan 50250, Israel
Corresponding author: G. Leitner; E-mail: leitnerg{at}int.gov.il.
The mechanism of the effects of subclinical mastitis (SM) at the glandular level in dairy goats on milk yield and its composition as expressed in curd yield (Yc) was studied. Twenty-five Israeli goats of various crossbreeds were chosen; one udder half was naturally infected with identified coagulase-negative staphylococci, and the contralateral gland was free of bacteria.
The milk yield of the infected halves was significantly lower than that of the uninfected ones. Somatic cell count and N-acetyl-ß-D-glucosaminidase activity were significantly higher in the infected halves. The lactose concentration in the infected glands was significantly lower than that in the uninfected ones, casein concentrations did not differ, and the whey protein and albumin concentrations were significantly higher in the infected glands.
Plasmin activity was significantly higher in the infected glands, whereas plasminogen activity was undetectable. Concentrations of Ca2+ did not differ, whereas Ca2+ activity was significantly lower in the infected glands. The proteose peptone concentration was 1.5 times as great in the infected glands as in the uninfected ones. The Yc was significantly lower in the infected halves, and clotting time was significantly longer.
The mechanisms of the effects of SM on milk yield and Yc in goats and sheep are discussed and compared.
Key Words: subclinical mastitis • goat • milk composition
Abbreviation key: aCa2+ = calcium activity, CN = casein, CNS = coagulase-negative staphylococci, p-p = proteose peptones, PA = plasminogen activator, PL = plasmin, PLG = plasminogen, SM = subclinical mastitis, Tc = clotting time, Yc = curd yield
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