Occurrence and reoccurrence of clinical mastitis

Clinical mastitis records for 6.5 yr (July 1977 through November 1983) from a large north Florida dairy were analyzed. Observed frequencies of clinical mastitis were calculated in 7240 Holstein and Jersey lactations. Least squares analyses used Holstein and Jersey lactations greater than 200 d and l...

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Bibliographic Details
Published in:Journal of dairy science 1987-10, Vol.70 (10), p.2168-2175
Main Authors: Morse, D, DeLorenzo, M.A, Wilcox, C.J, Natzke, R.P, Bray, D.R
Format: Article
Language:English
Subjects:
ANALISIS ESTADISTICO
ANALYSE STATISTIQUE
Animals
BOVIN LAITIER
BREEDS
Cattle
COWS
DAIRY CATTLE
Female
FLORIDA
FLORIDE
FORECASTING
GANADO DE LECHE
HOLSTEIN-FRIESIAN
JERSEY
LACTACION
LACTATION
MAMMITE
MASTITIS
Mastitis, Bovine - epidemiology
Pregnancy
PREVISION
PRONOSTICO
RACE
RAZAS
Recurrence
Species Specificity
STATISTICAL ANALYSIS
VACA
VACHE
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Summary:Clinical mastitis records for 6.5 yr (July 1977 through November 1983) from a large north Florida dairy were analyzed. Observed frequencies of clinical mastitis were calculated in 7240 Holstein and Jersey lactations. Least squares analyses used Holstein and Jersey lactations greater than 200 d and limited maximum parity to 5 (6732 lactations, 5738 episodes). Solutions for number of occurrences of clinical mastitis adjusted for month of parturition and breed effects were .47, .59, .94, 1.27, and 1.50 for parities 1 through 5. Solutions for number of occurrences across lactation in Holsteins was greater than for Jerseys (1.28 vs. .63). Solutions for occurrence of first episode in Holsteins increased from .35 in parity 1 to .71 in parity 5. Occurrence of episodes two through five increased as parity increased. Similar trends were found in Jerseys with the exception of parity 2. Correlation of residuals between specific episodes increased as episode increased. From episode 2 through 5 probability of another occurrence of clinical mastitis was greater than .75. Solutions for proportion of occurrences of clinical mastitis occurring during the first 35 d postcalving were .60, .36, .31, .30, and .28 for parities 1 through 5. Clinical mastitis in first parity cows occurred primarily during the first 35 d postcalving.
ISSN:0022-0302
1525-3198
DOI:10.3168/jds.S0022-0302(87)80270-9