The Effect of Pathogen-Specific Clinical Mastitis on the Lactation Curve for Somatic Cell Count

Barkema, 1999, Management practices associated with the incidence rate of clinical mastitis, J. Dairy Sci., 82, 1643, 10.3168/jds.S0022-0302(99)75393-2 Barkema, 1998, Incidence of clinical mastitis in dairy herds grouped in three categories by bulk milk somatic cell counts, J. Dairy Sci., 81, 411, 10.3168/jds.S0022-0302(98)75591-2 Blackburn, 1966, The variation in cell count of cow's milk throughout lactation and from one lactation to the next, J. Dairy Res., 33, 193, 10.1017/S0022029900011857 Bodoh, 1976, Variation in somatic cell counts in dairy herd improvement milk samples, J. Dairy Sci., 59, 1119, 10.3168/jds.S0022-0302(76)84331-7 Coffey, 1985, Heritabilities for lactation average of somatic cell counts in first, second, and third or later parities, J. Dairy Sci., 68, 3360, 10.3168/jds.S0022-0302(85)81247-9 De Haas, 2002, Genetic parameters of pathogen-specific incidence of clinical mastitis in dairy cows, Anim. Sci., 74, 233, 10.1017/S1357729800052401 Dohoo, 1991, Evaluation of changes in somatic cell counts as indicators of new intramammary infections, Prev. Vet. Med., 10, 225, 10.1016/0167-5877(91)90006-N Eberhart, 1982, Relationships of bulk tank somatic cell counts to prevalence of intramammary infection and to indices of herd production, J. Food Prot., 45, 1125, 10.4315/0362-028X-45.12.1125 Emanuelson, 1984, Studies on somatic cell counts in milk from Swedish dairy cows. I. Non-genetic causes of variation in monthly test-day results, Acta Agric. Scand., 34, 33, 10.1080/00015128409436179 Erskine, 1988, Incidence and types of clinical mastitis in dairy herds with high and low somatic cell counts, JAVMA, 192, 761 Erskine, 1992, Intramammary administration of gentamicin as treatment for experimentally induced Escherichia coli mastitis in cows, Am. J. Vet. Res., 53, 375 Gilmour, A. R.,B.R.Cullis, S. J. Welham, and R. Thompson. 2001. ASREML Reference Manual. February 23, 2001. NSW Agriculture, ORANGE, 2800, Australia. Green, 1998, Toxic mastitis in cattle, In Practice, 20, 128, 10.1136/inpract.20.3.128 Harmon, 1990 Harmon, 1994, Physiology of mastitis and factors affecting somatic cell counts, J. Dairy Sci., 77, 2103, 10.3168/jds.S0022-0302(94)77153-8 Heuven, H.C.M. 1987. Diagnostic and genetic analysis of mastitis field data. Ph.D. Diss., Univ. Wisconsin, WI. Hogan, 1989, Field survey of clinical mastitis in low somatic cell count herds, J. Dairy Sci., 72, 1547, 10.3168/jds.S0022-0302(89)79266-3 Huxley, 2001 Kehrli, 1994, Factors affecting milk somatic cells and their role in health of the bovine mammary gland, J. Dairy Sci., 77, 619, 10.3168/jds.S0022-0302(94)76992-7 Kramer, 1980, Lactose and cell content of samples from individual milkings, as affected by udder infections and systematic influences, Milchwissenschaft, 35, 136 Laevens, 1997, Influence of parity and stage of lactation on the somatic cell count in bacteriologically negative dairy cows, J. Dairy Sci., 80, 3219, 10.3168/jds.S0022-0302(97)76295-7 Lam, 1997, Effect of natural infections with minor pathogens on susceptibility to natural infections with major pathogens in the bovine mammary gland, Am. J. Vet. Res., 58, 17 Lindström, 1981, Usefulness of cell counts in predicting bovine mastitis, Acta Agric. Scand., 31, 199, 10.1080/00015128109435317 Matthews, 1992, Susceptibility of staphylococci and streptococci isolated from bovine milk to antibiotics, Agric. Pract., 13, 18 Miltenburg, 1996, Incidence of clinical mastitis in a random sample of dairy herds in the southern Netherlands, Vet. Rec., 139, 204, 10.1136/vr.139.9.204 Mrode, 1996, Genetic and statistical properties of somatic cell count and its suitability as an indirect means of reducing the incidence of mastitis in dairy cattle, Anim. Breed. Abstr., 64, 847 Pyörälä, 1994, Efficacy of two therapy regimens for treatment of experimentally induced Escherichia coli mastitis in cows, J. Dairy Sci., 77, 453, 10.3168/jds.S0022-0302(94)76973-3 Reents, 1995, Estimation of genetic parameters for test day records of somatic cell score, J. Dairy Sci., 78, 2847, 10.3168/jds.S0022-0302(95)76915-6 Schepers, 1997, Estimation of variance components for somatic cell counts to determine thresholds for uninfected quarters, J. Dairy Sci., 80, 1833, 10.3168/jds.S0022-0302(97)76118-6 Schutz, 1990, Variation of milk, fat, protein, and somatic cells for dairy cattle, J. Dairy Sci., 73, 484, 10.3168/jds.S0022-0302(90)78696-1 Sheldrake, 1983, Lactation stage, parity, and infection affecting somatic cells, electrical conductivity, and serum albumin in milk, J. Dairy Sci., 66, 542, 10.3168/jds.S0022-0302(83)81823-2 Shoshani, 2000, Mammary infection with Staphylococcus aureus in cows: Progress from inoculation to chronic infection and its detection, J. Dairy Res., 67, 155, 10.1017/S002202990000412X Sischo, 1993, Prevalence of contagious pathogens of bovine mastitis and use of mastitis control practices, JAVMA, 202, 595 Smith, 1985, Environmental pathogens and intramammary infection during the dry period, J. Dairy Sci., 68, 402, 10.3168/jds.S0022-0302(85)80838-9 Weller, 1992, Genetic and environmental relationships among somatic cell count, bacterial infection, and clinical mastitis, J. Dairy Sci., 75, 2532, 10.3168/jds.S0022-0302(92)78015-1 White, 1999, Genetic and environmental smoothing of lacatation curves with cubic splines, J. Dairy Sci., 82, 632, 10.3168/jds.S0022-0302(99)75277-X Wiggins, 1987, A lactation measure of somatic cell count, J. Dairy Sci., 70, 2666, 10.3168/jds.S0022-0302(87)80337-5