{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,6]],"date-time":"2026-06-06T09:41:54Z","timestamp":1780738914501,"version":"3.54.1"},"reference-count":36,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2023,12,26]],"date-time":"2023-12-26T00:00:00Z","timestamp":1703548800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Aust Veterinary J"],"published-print":{"date-parts":[[2024,3]]},"abstract":"<jats:p>This was a prospective cohort study to determine how events from birth until first calving affect reproductive performance in the first lactation in pasture\u2010based dairy herds in Victoria, Australia. Events during the preweaning (0 to 84\u2009days), weaning to first breeding (85 to 473\u2009days) and first breeding to first calving periods (474 to 804\u2009days) were recorded and their association with reproductive performance during the first lactation was quantified. Reproductive performance outcomes included the number of days from first mating start date to first service (MSD\u2010S1) and the number of days from first mating start date to first conception (MSD\u2010CON). Predictors for reproductive performance included: passive transfer status as a calf; season of birth; age and breed of the dam; breed; the presence or absence of dystocia at the time of the heifer's birth; active feeding of colostrum versus being left on the dam for colostrum intake; presence of twinning; the presence or absence of preweaning diarrhoea; preweaning, prepubertal and postpubertal average daily gain; the presence or absence of periparturient disease at first calving; age at first calving; body condition score at first calving; sex of the first\u2010born calf; the presence or absence of a stillborn calf at the first calving and requirement of assistance at first calving. Two Cox proportional hazards regression models were developed: the first for early life event variables associated with MSD\u2010S1 and the second for early life events associated with MSD\u2010CON. Heifers born in autumn and winter had 2.89 (95% CI 1.50 to 5.59, P\u2009=\u20090.002) times and 1.97 (95% CI 1.12 to 3.44, P\u2009=\u20090.018) times the daily hazard of being inseminated compared with heifers born in spring, respectively. For the MSD\u2010S1 analyses heifers that gave birth to a live calf had 1.64 (95% CI 1.14 to 2.36, P\u2009=\u20090.008) times the daily hazard of being inseminated compared with heifers that had a stillborn calf. Increases in weight gain during the first breeding to first calving period by 0.1\u2009kg\/day increments increased the daily hazard of first insemination by a factor of 1.10 (95% CI 1.00 to 1.22, P\u2009=\u20090.043). Heifers that experienced periparturient disease had a significantly lower hazard of conception per day compared with heifers that did not experience periparturient disease at the first calving (HR 0.67, 95% CI 0.50 to 0.91, P\u2009=\u20090.009). Increases in weight gain during the first breeding to first calving period by 0.1\u2009kg\/day increased the daily hazard of conception by a factor of 1.10 (95% CI 1.01 to 1.21, P\u2009=\u20090.038). We conclude that of all the growth periods assessed in this study, events that occurred during the first breeding to first calving period (474 to 804\u2009days) had the greatest association with reproductive performance in the first lactation. There should be a focus on increasing growth rates during this period and reducing the risk of stillbirth and periparturient disease to improve reproductive performance in the subsequent mating period after calving.<\/jats:p>","DOI":"10.1111\/avj.13305","type":"journal-article","created":{"date-parts":[[2023,12,27]],"date-time":"2023-12-27T06:00:07Z","timestamp":1703656807000},"page":"51-59","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Early life events associated with first lactation reproductive performance in southwest Victorian pasture\u2010based dairy herds"],"prefix":"10.1111","volume":"102","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3709-3285","authenticated-orcid":false,"given":"GM","family":"Chuck","sequence":"first","affiliation":[{"name":"Melbourne Veterinary School The University of Melbourne  Parkville Victoria Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7216-2947","authenticated-orcid":false,"given":"PD","family":"Mansell","sequence":"additional","affiliation":[{"name":"Melbourne Veterinary School The University of Melbourne  Parkville Victoria Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"MA","family":"Stevenson","sequence":"additional","affiliation":[{"name":"Melbourne Veterinary School The University of Melbourne  Parkville Victoria Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"MM","family":"Izzo","sequence":"additional","affiliation":[{"name":"Apiam Animal Health Smithton Veterinary Service  Smithton Tasmania Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2023,12,26]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.3168\/jds.S0022-0302(05)72814-9"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.3168\/jds.2009-3007"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.3168\/jds.2013-7419"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.3168\/jds.S0022-0302(04)73400-1"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.3168\/jds.S0022-0302(07)72639-5"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1136\/vr.141.3.67"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0093-691X(99)00091-6"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.3168\/jds.2010-3923"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.3168\/jds.S0022-0302(69)86595-1"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.3168\/jds.S0022-0302(00)75019-3"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.3168\/jds.S0022-0302(05)73020-4"},{"key":"e_1_2_8_13_1","first-page":"61","volume-title":"Recent advances in animal nutrition","author":"Garnsworthy PC","year":"2006"},{"key":"e_1_2_8_14_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.anireprosci.2008.01.014"},{"key":"e_1_2_8_15_1","doi-asserted-by":"publisher","DOI":"10.1017\/S0003356100000878"},{"key":"e_1_2_8_16_1","unstructured":"JonesGP GarnsworthyPC.The influence of body condition at calving and dietary energy and protein supply on reproductive performance in lactating dairy cows.1988."},{"key":"e_1_2_8_17_1","doi-asserted-by":"publisher","DOI":"10.3168\/jds.S0022-0302(03)73823-5"},{"key":"e_1_2_8_18_1","doi-asserted-by":"publisher","DOI":"10.1016\/0093-691X(85)90156-6"},{"key":"e_1_2_8_19_1","doi-asserted-by":"publisher","DOI":"10.3168\/jds.S0022-0302(86)80517-3"},{"key":"e_1_2_8_20_1","doi-asserted-by":"publisher","DOI":"10.3168\/jds.S0022-0302(92)77796-0"},{"key":"e_1_2_8_21_1","doi-asserted-by":"publisher","DOI":"10.3168\/jds.S0022-0302(97)75995-2"},{"key":"e_1_2_8_22_1","doi-asserted-by":"publisher","DOI":"10.3168\/jds.2017-12626"},{"key":"e_1_2_8_23_1","first-page":"1331","article-title":"Refractometry as a measure of immunoglobulin status of newborn dairy calf\u2010 comparison with zinc\u2010sulfate turbidity test and single radial immunodiffusion","volume":"38","author":"Naylor JM","year":"1977","journal-title":"Am J Vet Res"},{"key":"e_1_2_8_24_1","first-page":"228","article-title":"A guide to scoring dairy cow condition","volume":"74","author":"Earle D","year":"1976","journal-title":"J Agric, Victoria"},{"key":"e_1_2_8_25_1","first-page":"980","volume-title":"Using multivariate statistics","author":"Tabachnick BG","year":"2007"},{"key":"e_1_2_8_26_1","doi-asserted-by":"publisher","DOI":"10.1002\/0470013192.bsa234"},{"key":"e_1_2_8_27_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-1-4757-3294-8"},{"key":"e_1_2_8_28_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0378-4320(00)00107-X"},{"key":"e_1_2_8_29_1","doi-asserted-by":"publisher","DOI":"10.3168\/jds.S0022-0302(83)81909-2"},{"key":"e_1_2_8_30_1","doi-asserted-by":"publisher","DOI":"10.1080\/00015127609435084"},{"key":"e_1_2_8_31_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.tvjl.2007.12.032"},{"key":"e_1_2_8_32_1","doi-asserted-by":"publisher","DOI":"10.3168\/jds.S0022-0302(98)75604-8"},{"key":"e_1_2_8_33_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0167-5877(97)00059-7"},{"key":"e_1_2_8_34_1","doi-asserted-by":"publisher","DOI":"10.3168\/jds.2011-5067"},{"key":"e_1_2_8_35_1","doi-asserted-by":"publisher","DOI":"10.3168\/jds.S0022-0302(84)81305-3"},{"key":"e_1_2_8_36_1","doi-asserted-by":"publisher","DOI":"10.3168\/jds.S0022-0302(88)79684-8"},{"key":"e_1_2_8_37_1","doi-asserted-by":"publisher","DOI":"10.3168\/jds.2010-3253"}],"container-title":["Australian Veterinary Journal"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1111\/avj.13305","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2024,3,4]],"date-time":"2024-03-04T02:26:32Z","timestamp":1709519192000},"score":1,"resource":{"primary":{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/10.1111\/avj.13305"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2023,12,26]]},"references-count":36,"journal-issue":{"issue":"3","published-print":{"date-parts":[[2024,3]]}},"alternative-id":["10.1111\/avj.13305"],"URL":"https:\/\/doi.org\/10.1111\/avj.13305","archive":["Portico"],"relation":{},"ISSN":["0005-0423","1751-0813"],"issn-type":[{"value":"0005-0423","type":"print"},{"value":"1751-0813","type":"electronic"}],"subject":[],"published":{"date-parts":[[2023,12,26]]},"assertion":[{"value":"2023-07-03","order":0,"name":"received","label":"Received","group":{"name":"publication_history","label":"Publication History"}},{"value":"2023-11-18","order":1,"name":"accepted","label":"Accepted","group":{"name":"publication_history","label":"Publication History"}},{"value":"2023-12-26","order":2,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}]}}