Reproductive performance of beef heifers: Effects of vulvo-vaginitis, and prebreeding antibiotic administration
| Autor: | M.B. Brown, D. O. Rae, P. C. Genho, S. A. Moore, K.E. Jacobsen, P.J. Chenoweth |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
Chlortetracycline
Gynecology medicine.medical_specialty Pregnancy animal structures biology Equine medicine.drug_class animal diseases Antibiotics Physiology Beef cattle medicine.disease biology.organism_classification Ureaplasma Pregnancy rate Ureaplasma diversum Food Animals medicine Animal Science and Zoology Small Animals medicine.drug Vaginitis |
| Zdroj: | Theriogenology. 40:497-508 |
| ISSN: | 0093-691X |
| DOI: | 10.1016/0093-691x(93)90403-r |
| Popis: | A group of 450 heifers, 13 to 15 mo of age, were individually identified, vaccinated (IBR, PI(3), Leptospira, Campylobacter fetus), examined (body condition score, reproductive tract evaluation, assessment of vaginal lesions), and cultured for U. diversum . Heifers were randomly allocated to either a treated group given chlortetracycline (approximately 350 mg/hd/d for 30 d in a grain crumble) or a nontreated control group. Prebreeding, most heifers showed signs of vulvovaginitis, 44% cultured positive for U. diversum . Significant associations were found between the severity of vaginal lesions and ovarian activity (P 0.5). At pregnancy examination (35 d following conclusion of a 61-d breeding season), treated compared with nontreated heifers showed 1) a slight but not significant (P > 0.25) decrease in vaginal colonization by U. diversum (46 to 34% and 41 to 37%, respectively); 2) an association between increased severity of vaginal lesions and increasing pregnancy rate, especially in treated heifers; and 3) an increased pregnancy rate (72 and 57%, respectively; P < 0.01). Prebreeding treatment with chlortetracycline appeared to improve pregnancy rates in beef heifers with endemic U. diversum infections, although the role of U. diversum in heifer fertility is still not clear. |
| Databáze: | OpenAIRE |
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