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The purpose of this study was to estimate the contributions of genetic and environmental factors to litter size in Labrador retrievers and German shepherd dogs in the breeding colony at The Seeing Eye, Inc. The environmental factors with significant impact on litter size were the parity of the dam and contemporary group, a three-month period that represents seasonal effects, the passage of time in...
A questionnaire covering management practices and producer perception of the effects of gastrointestinal nematode infections was sent to dairy and beef producers in the northeastern US. The mailing list was derived from membership in grazing groups and attendance at grazing events. A final total of 474 responses were suitable for analyses. These responses covered 14 states, but for the purpose of...
Gastrointestinal nematode infections of cattle remain a constraint on the efficient raising of cattle on pasture throughout the world. Most of the common genera of parasites found in cattle stimulate an effective level of protective immunity in most animals within the herd after the animals have been on pasture for several months. In contrast, cattle remain susceptible to infection by Ostertagia for...
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