Anestrus in cycling beef heifers experimentally inoculated with |
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Authors: | Brinton L Swift Rollin Wade Johnson George M Thomas |
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Institution: | Division of Microbiology and Veterinary Medicine University of Wyoming, Laramie, Wyoming 82071 USA |
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Abstract: | Normal estrous cycles were established for twenty beef heifers. Ten heifers were inoculated with blood from a known carrier. The inoculated heifers experienced anemia, anorexia, and positive complement-fixing antibody titers, and . was observed on the erythrocytes while uninoculated control heifers remained normal. Further observation following inoculation revealed that five of ten inoculated heifers experienced anestrus while controls continued to cycle normally. Anestrus coincided with clinical signs of acute anaplasmosis. Normal estrus patterns returned following treatment and recovery. This study provides evidence that acute anaplasmosis in beef heifers may cause anestrus and therefore lead to reproductive inefficiency. |
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