| the distribution and characterization of group b streptococci in new york state. | group b streptococcal isolates from bovine mastitis were classified according to the lancefield typing scheme. three types were found in new york state dairy herds; ia, ii and iii. the distribution within these types varies from area to area, however, on a state-wide basis ia is the most prevalent (69.6%) followed by type ii (16.7%) and type iii (10.1%). within a single herd one type predominants with only slight incidence of other types. attempts to determine distinguishing characteristics betw ... | 1976 | 770075 |
| selecting linear-score distributions for modelling milk-culture results. | the data for this cross-sectional retrospective study are from surveys of 65 dairy-cattle herds in central new york, usa sampled between february, 1993 and march, 1995. the objective was to identify probability distributions of logarithmically transformed somatic-cell counts (linear score) for use in a simulation model of mastitis and milk quality. probability density functions were estimated using maximum-likelihood estimators for the linear score of individual-cow composite-milk samples cultur ... | 1998 | 9500161 |