{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,8]],"date-time":"2025-11-08T22:53:34Z","timestamp":1762642414683,"version":"3.41.2"},"reference-count":48,"publisher":"Oxford University Press (OUP)","issue":"1","license":[{"start":{"date-parts":[[2020,11,18]],"date-time":"2020-11-18T00:00:00Z","timestamp":1605657600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2021,1,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>This study evaluated the effect of heifer development system on body weight (BW), body condition score (BCS), fescue toxicosis symptoms, reproductive performance, and subsequent calf growth of fall-calving beef heifers. Angus \u00d7 Simmental heifers [n = 399; 240 \u00b1 20.0 kg initial BW; age = 252 \u00b1 20 d] were stratified by BW and BCS and assigned to 1 of 12 groups in each of the two production years. The study utilized a stratified randomized design. Pens were randomly assigned to four treatments: drylot (DL) development (fed ad-libitum diet consisting of 90% hay and 10% DDGS on a dry matter basis), grazing endophyte-infected fescue supplemented daily (2.3 kg as-fed\/heifer\/d; 50:50 mix of soybean hulls and DDGS; E+\/S), grazing endophyte-infected fescue and supplemented from the midpoint of treatment period until breeding (4.5 kg as-fed\/heifer\/d; 50:50 mix of soybean hulls and DDGS; E+\/LS), and grazing novel endophyte-infected fescue with no supplement (NE+\/NS). Treatments ceased on d 168 [time of artificial insemination (AI)] and heifers were commingled and managed as a group through second breeding season. Heifers in DL had greatest (P \u2264 0.05) BW and BCS from d 28 until d 254. Furthermore, E+\/S heifers had greater (P \u2264 0.05) BW and BCS than both E+\/LS and NE+\/NS from d 28 until d 168. On d 56 and 84, E+\/LS heifers had lower (P \u2264 0.05) BW and BCS compared to NE+\/NS, but on d 148 treatments reranked and E+\/LS remained at a greater (P \u2264 0.05) BW and BCS compared to NE+\/NS through the first breeding season. Drylot heifers had greatest (P \u2264 0.05) percentage cycling and percentage of mature BW at AI (66.6%) and had greater (P \u2264 0.05) AI and overall pregnancy rates compared to E+\/LS and NE+\/NS. The E+\/S (55%) and E+\/LS (53.7%) heifers were developed to a greater (P &amp;lt; 0.01) percentage of mature BW than NE+\/NS (49.3%). A greater (P \u2264 0.02) percentage of DL and E+\/S heifers were pregnant at the end of the first breeding season (89.3 and 85.1%; respectively) compared to NE+\/NS (61.5%). In summary, DL heifers had the greatest BW and BCS at AI, percentage cycling, and AI pregnancy rate. However, this strategy did not result in differing overall pregnancy rates between DL, E+\/S, and E+\/LS and there were no differences in milk production, rebreeding reproductive performance, and calf performance between all treatments. Finally, the poorest AI and overall pregnancy rates of the NE+\/NS heifers suggests this is not a viable development strategy for fall-born heifers.<\/jats:p>","DOI":"10.1093\/tas\/txaa209","type":"journal-article","created":{"date-parts":[[2020,11,19]],"date-time":"2020-11-19T02:40:25Z","timestamp":1605753625000},"source":"Crossref","is-referenced-by-count":2,"title":["Effects of management system on beef heifer growth and reproductive performance"],"prefix":"10.1093","volume":"5","author":[{"given":"Parker A","family":"Henley","sequence":"first","affiliation":[{"name":"Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana, IL"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Frank A","family":"Ireland","sequence":"additional","affiliation":[{"name":"Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana, IL"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Igor F","family":"Canisso","sequence":"additional","affiliation":[{"name":"Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois, Urbana, IL"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"J Lannett","family":"Edwards","sequence":"additional","affiliation":[{"name":"University of Tennessee Animal Science Department, Knoxville, TN"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Daniel W","family":"Shike","sequence":"additional","affiliation":[{"name":"Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana, IL"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"286","published-online":{"date-parts":[[2020,11,18]]},"reference":[{"key":"2021012111424726300_CIT0001","doi-asserted-by":"crossref","first-page":"5878","DOI":"10.2527\/jas.2012-5964","article-title":"Postgraze assessment of toxicosis symptoms for steers grazed on toxic endophyte-infected tall fescue pasture","volume":"91","author":"Aiken","year":"2013","journal-title":"J. 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