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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Bijker, I. Christley, R. M. Smith, R. F. Dobson, H. |
| Description | Author Affiliation: Bijker I ( West Ridge Veterinary Practice, Witheridge, Devon, UK St Boniface Veterinary Clinic, Crediton, Devon, UK*); Christley RM ( Institute for Infection and Global Health, University of Liverpool, Leahurst Campus, Neston, Cheshire CH64 7TE, UK.); Smith RF ( School of Veterinary Science, University of Liverpool, Leahurst Campus, Neston, Cheshire CH64 7TE, UK.); Dobson H ( School of Veterinary Science, University of Liverpool, Leahurst Campus, Neston, Cheshire CH64 7TE, UK.) |
| Abstract | The objective was to examine (a) how pregnancy rate on one farm (500 cows) was affected by signs of oestrus and disease stressors and (b) whether pregnancy rate could be maximised by considering cow activity. The signs of oestrus and timings were recorded at artificial insemination (AI), and cow activity was monitored by neck collars. Pregnancy rate tended to be higher in animals that displayed standing oestrus (35 v 26 per cent; P=0.06) but was 10 per cent lower in those cows with an elevated somatic cell count (SCC; >200,000â cells/ml milk) within 0-4 or 4-8â weeks prior to AI (P=0.01 and 0.05, respectively), irrespective of the incidence of clinical mastitis prior to AI. Cow activity data were available for 525 inseminations (from a total of 1299). The mean interval from increased activity to AI in all cows (11â hours 32â minutes; 95 per cent CI 10â hours 40â minutes to 12â hours 24â minutes) was not different for cows that did or did not establish a pregnancy (P=0.90). The pregnancy rate improved to the average of unaffected cows if AI was delayed by about eight hours in animals with an elevated SCC 0-4â weeks prior to AI (P=0.025), indicating that, in cows with prior elevated SCC, AI could be repeated approximately eight hours later to achieve maximum pregnancy rates. |
| File Format | HTM / HTML |
| ISSN | 00424900 |
| Issue Number | 16 |
| Volume Number | 176 |
| e-ISSN | 20427670 |
| Journal | Veterinary Record |
| Language | English |
| Publisher | BMJ Group |
| Publisher Date | 2015-04-18 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Veterinary Discipline Medicine Cattle Physiology Estrus Insemination, Artificial Veterinary Mastitis, Bovine Physiopathology Motor Activity Pregnancy Rate Stress, Physiological Animals Body Composition Cell Count Female Epidemiology Milk Cytology Pregnancy Journal Article |
| Content Type | Text |
| Resource Type | Article |
| Subject | Veterinary Medicine |
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