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05) after the breeding season compared with bulls not used for breeding. Taken together, yearling bulls selected for a 28-d breeding season have reduced sperm production per ml of an ejaculate and increased inflammatory response in the seminal plasma that can lead to impaired breeding response if they are to be used for more than 30 d of breeding. Asthma symptoms are often mediated by changes in immune responses to allergens measured by the levels of immunoglobulin E (IgE) and non-protein regulators such as 25-hydroxycholecalciferol (25