Edward C. Mather

Metritis complex in Michigan Holstein-Friesian cattle: incidence, descriptive epidemiology and estimated economic impact

Abstract Twenty-two Michigan dairy herds participating in a computerized herd health program were studied to determine the incidence and epidemiologic characteristics of metritis. Of 3773 lactations studied, 18% of the cows developed metritis at least once during the lactation. Metritis was reported most frequently immediately following calving. No clear pattern of association with age or season was demonstrated. A estimate was made of the extra cost associated with a cow treated for metritis. After including the effect on reproductive efficiency, milk production, cost of medication and losses due to culling, the total cost estimate was

Cystic follicular disease in Michigan Holstein-Friesian cattle: Incidence, descriptive epidemiology and economic impact

106.00 for a lactation with metritis.

Repeated insemination in Michigan Holstein-Friesian cattle: Incidence, descriptive epidemiology and estimated economic impact.

Abstract Data collected from the Food Animal Health Resource Management System (FAHRMX) Dairy Herd Health Network between 1981 and 1984 were used to study the incidence, descriptive epidemiology and economic impact of cystic follicular disease. Complete records were available for 2847 lactations of Holstein-Friesian cows from 21 Michigan herds. The lactational incidence rate of cystic follicular disease was 12.8%. The condition was more common in older cattle, with a bimodal peak incidence between 30 an 40 days post-partum and between 190 and 220 days post-partum. The economic loss for the average lactation with cystic follicles was estimated at approximately

The effect of age at calving on reproduction, milk production and disease incidence in the first lactation of dairy heifers

137 considering the effects on reproduction, culling, medical costs and labor. Lactations with cystic follicles produced an average of

The educational implications of reproductive problems identified during investigations at Michigan dairy farms

98 more 305 mature equivalent milk than lactations without cystic follicles.

Descriptive epidemiology of anestrus in Michigan Holstein-Friesian cattle

Twenty-two Michigan dairy herds participating in a computerized herd-health program were studied to determine the incidence and epidemiologic characteristics of repeat-breeder syndrome. A cow with repeat-breeder syndrome was defined as having been inseminated three or more times within the same lactation. Repeat-breeder syndrome was observed in 24% of 3,309 lactations. Cost components associated with unsuccessful inseminations included costs of delayed conception, extra inseminations, extra veterinary service and losses due to culling. Lactations with repeat-breeder syndrome were associated with a loss of approximately

Prevalence of Salmonella spp in cull (market) dairy cows at slaughter

385. An estimated extra cost of

Diversity of Salmonella serotypes in cull (market) dairy cows at slaughter

140 was associated with a second insemination,

The Periparturient Cow — A Pivotal Entity in Dairy Production

279 with three inseminations,

Comparative study of the knowledge, attitudes, and behaviors of large animal veterinarians, dairy farmers, and dairy processors in Michigan on bovine somatotropin.

429 with four inseminations and