{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,26]],"date-time":"2025-10-26T14:22:38Z","timestamp":1761488558427,"version":"build-2065373602"},"reference-count":13,"publisher":"Wiley","issue":"19","license":[{"start":{"date-parts":[[1997,5,10]],"date-time":"1997-05-10T00:00:00Z","timestamp":863222400000},"content-version":"vor","delay-in-days":9,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"name":"Intervet UK and Scottish Livestock Services"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Veterinary Record"],"published-print":{"date-parts":[[1997,5]]},"abstract":"<jats:p>The feasibility of breeding spring\u2010calving, single\u2010suckled beef cows without the use of natural service was investigated over two breeding seasons by using repeated oestrus synchrony and fixed\u2010time artificial insemination (AI). Initially, cows were oestrus\u2010synchronised with subcutaneous norgestomet implants inserted for 10\u00a0days, with an injection of prostaglandin before the implants were removed. The cows were inseminated once 56 hours after the implants were removed, and 12\u00a0days later they were re\u2010treated with norgestomet implants to allow a second synchronised service. Twenty\u2010one days after the first synchronised AI, milk samples were taken for progesterone assay and the norgestomet implants were removed. The cows received a second service 56 hours later if the 21\u2010day milk progesterone assay suggested that they were not pregnant. All the cows receiving a second service were retreated with norgestomet implants to allow a third synchronised service as necessary. Pregnancy was later confirmed by rectal palpation. In the first year, 48 cows entered the programme and the pregnancy rates to the first, second and third synchronised services were 56, 69 and 40 per cent, respectively, with 17 per cent of cows barren at the end of the breeding period. In the second year, 69 cows entered the programme and the pregnancy rates were 58, 48 and 33 per cent to the successive services with 20 per cent of cows barren at the end of the breeding period. The accuracy of milk progesterone assay for pregnancy diagnosis was 84 per cent and 87 per cent in the first and second years, respectively.<\/jats:p>","DOI":"10.1136\/vr.140.19.496","type":"journal-article","created":{"date-parts":[[2010,10,4]],"date-time":"2010-10-04T23:02:24Z","timestamp":1286233344000},"page":"496-498","source":"Crossref","is-referenced-by-count":3,"title":["Repeated oestrus synchrony and fixed\u2010time artificial insemination in beef cows"],"prefix":"10.1002","volume":"140","author":[{"given":"C. D.","family":"Penny","sequence":"first","affiliation":[{"name":"Department of Veterinary Clinical Studies Royal (Dick) School of Veterinary Studies Veterinary Field Station, Easter Bush Roslin Midlothian EH25 9RG"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"B. G.","family":"Lowman","sequence":"additional","affiliation":[{"name":"Scottish Agricultural College Department of Genetics and Behaviour Science Bush Estate Penicuik Midlothian EH26 OPH"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"N. A.","family":"Scott","sequence":"additional","affiliation":[{"name":"Scottish Agricultural College Department of Genetics and Behaviour Science Bush Estate Penicuik Midlothian EH26 OPH"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"P. 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