{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,7]],"date-time":"2026-09-07T17:18:57Z","timestamp":1788801537219,"version":"build-2803163510"},"reference-count":62,"publisher":"Oxford University Press (OUP)","license":[{"start":{"date-parts":[[2024,12,25]],"date-time":"2024-12-25T00:00:00Z","timestamp":1735084800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Christian Doppler Laboratory for Innovative Gut Health Concepts of Livestock"},{"DOI":"10.13039\/501100001659","name":"Deutsche Forschungsgemeinschaft","doi-asserted-by":"publisher","award":["447776988"],"award-info":[{"award-number":["447776988"]}],"id":[{"id":"10.13039\/501100001659","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2025,1,4]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>We recently reported factors leading to different severity of ruminal pH drop in primiparous cows fed the same diet during transition and early lactation. The present study evaluates the effects of those severities on performance and several blood and balance parameters in the same 24 primiparous cows from 3\u00a0wk before calving until week 10 in lactation. The dietary concentrate was increased for all cows from 32 before calving to 60% dry matter (DM) basis over the first week in lactation, resulting in a diet with 40% non-fiber carbohydrates (NFC), and 14.4% physically effective fiber [peNDF\u2005&amp;gt;\u20058]. Ruminal pH was monitored with indwelling systems in all cows during the study; then several indices of duration and magnitude of pH change were used as indicators of the severity of ruminal pH drop. Accordingly, as reported in the companion paper, the cows were classified as either higher pH drop (HIGH; n\u2005=\u20059), moderate (MOD; n\u2005=\u20059), or lower (LOW; n\u2005=\u20056) severity of pH drop. In the present report, body weight, body condition score, and back fat thickness decreased but rumen mucosa thickness increased after calving in all cows (P\u2005&amp;lt;\u20050.05). Post-partum daily energy intake in HIGH was greater (P\u2005&amp;lt;\u20050.05) than in the other categories. In addition, there were 5.6\u00a0kg extra of energy-corrected milk in HIGH (P\u2005&amp;lt;\u20050.05). Independent of the severity of pH drop, blood glucose, non-esterified fatty acids, beta-hydroxybutyrate, bilirubin, and cortisol were higher, whereas triglycerides, total protein, globulin, albumin, urea nitrogen, cholesterol, calcium, and phosphorous were lower at calving (P\u2005&amp;lt;\u20050.05). Blood cholesterol was greater in HIGH than the other pH categories (P\u2005&amp;lt;\u20050.05); insulin and reproductive variables were not affected by the severity of the pH drop. Overall, primiparous cows fed the same diet showed different severity of ruminal pH drop, but the individual variation in ruminal pH depression was not related to a negative impact on milk yield, energy balance, or blood metabolites during the study. This indicates that the impact of low ruminal pH on the animals may depend not only on the severity of the pH drop (average of 403\u00a0min\/d of pH\u2005&amp;lt;\u20055.8 over 13\u00a0wk) but also on diet characteristics. Specifically, drops of ruminal pH can be tolerated by primiparous cows during the first 10\u00a0wk in milk consuming a diet containing 40% NFC and 14.4% peNDF\u2005&amp;gt;\u20058. It would be worth studying the severity of ruminal pH drop in a larger sample size during the entire lactation and if the severity is sustained on the next lactation.<\/jats:p>","DOI":"10.1093\/jas\/skae390","type":"journal-article","created":{"date-parts":[[2024,12,25]],"date-time":"2024-12-25T07:56:57Z","timestamp":1735113417000},"source":"Crossref","is-referenced-by-count":6,"title":["Differences in severity of reticulo-rumen pH drop in primiparous Holstein cows fed the same diet during transition and early lactation: effects on performance, energy balance, blood metabolites, and reproduction"],"prefix":"10.1093","volume":"103","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9304-2351","authenticated-orcid":false,"given":"Ezequias","family":"Castillo-Lopez","sequence":"first","affiliation":[{"name":"Centre for Animal Nutrition and Welfare, University of Veterinary Medicine Vienna , Vienna, 1210 ,","place":["Austria"]},{"name":"Christian Doppler Laboratory for Innovative Gut Health Concepts of Livestock, University of Veterinary Medicine Vienna ,\u00a0 Vienna, 1210 ,","place":["Austria"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5709-0500","authenticated-orcid":false,"given":"Thomas","family":"Hartinger","sequence":"additional","affiliation":[{"name":"Centre for Animal Nutrition and Welfare, University of Veterinary Medicine Vienna , Vienna, 1210 ,","place":["Austria"]},{"name":"Christian Doppler Laboratory for Innovative Gut Health Concepts of Livestock, University of Veterinary Medicine Vienna ,\u00a0 Vienna, 1210 ,","place":["Austria"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mohsen M","family":"Farghaly","sequence":"additional","affiliation":[{"name":"Department of Animal Production, Faculty of Agriculture, Assiut University , Assiut, 71526 ,","place":["Egypt"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9207-452X","authenticated-orcid":false,"given":"Nicole","family":"Reisinger","sequence":"additional","affiliation":[{"name":"AHN R&D Center Tulln, dsm-firmenich , Tulln, 3430 ,","place":["Austria"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Claudia","family":"Lang","sequence":"additional","affiliation":[{"name":"Centre for Animal Nutrition and Welfare, University of Veterinary Medicine Vienna , Vienna, 1210 ,","place":["Austria"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Laura","family":"Klambauer","sequence":"additional","affiliation":[{"name":"Christian Doppler Laboratory for Innovative Gut Health Concepts of Livestock, University of Veterinary Medicine Vienna ,\u00a0 Vienna, 1210 ,","place":["Austria"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Johann","family":"Huber","sequence":"additional","affiliation":[{"name":"Research and Teaching Farm, VetFarm Kremesberg, University of Veterinary Medicine Vienna , Pottenstein, 2563 ,","place":["Austria"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5188-9004","authenticated-orcid":false,"given":"Qendrim","family":"Zebeli","sequence":"additional","affiliation":[{"name":"Centre for Animal Nutrition and Welfare, University of Veterinary Medicine Vienna , Vienna, 1210 ,","place":["Austria"]},{"name":"Christian Doppler Laboratory for Innovative Gut Health Concepts of Livestock, University of Veterinary Medicine Vienna ,\u00a0 Vienna, 1210 ,","place":["Austria"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2024,12,25]]},"reference":[{"key":"2025012407463629000_CIT0001","doi-asserted-by":"publisher","first-page":"1092","DOI":"10.2527\/jas.2010-3301","article-title":"Ruminant nutrition symposium: role of fermentation acid absorption in the regulation of ruminal pH","volume":"89","author":"Aschenbach","year":"2011","journal-title":"J. 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