ominous
发表于 2025-3-21 18:08:11
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微不足道
发表于 2025-3-21 21:00:36
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Functional
发表于 2025-3-22 04:05:22
A Serosurvey of Viruses during Outbreaks of Acute Respiratory/Enteric Disease in Swedish Cattle Serum antibodies were found against all tested antigens and the frequency ranged from 20 to 80%. The frequency of significant increases in titre in connection with disease varied for the different viruses between 2% and 7%.
极少
发表于 2025-3-22 08:24:06
Variation in the Respiratory Virus Status of Large Bovine Units in Belgiumles from the calves before colostrum feeding and at different ages, were checked for the commonest viruses. Paired sera were also examined when respiratory infections occurred..Results of this study were as follows:
Enzyme
发表于 2025-3-22 12:13:40
Respiratory Diseases in Calves — Incidence and Epidemiology in Denmark period a total of 1 010 single calves were born. The rd mortality rate in the herd was 9%. Approximately 85–90% of the fatal cases of rd occurred after the third week of life. Rd accounted for approximately 50% of the economic loss per calf.
Anthrp
发表于 2025-3-22 16:47:07
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流眼泪
发表于 2025-3-22 17:41:24
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antecedence
发表于 2025-3-22 23:07:18
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汇总
发表于 2025-3-23 04:59:10
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表否定
发表于 2025-3-23 06:52:02
Disease Incidence and Epidemiology — The Situation in the U.K. the period 3 months of age to slaughter was 1.9%..In the period 1970–77 enzootic pneumonia accounted for 50% of 448 deaths recorded on a variety of different farms throughout the UK amongst over 8 000 animals (overall death rate 5.5%). Between 22 and 52% of 5 989 animals were treated for enzootic p