43. Effects of Chromium Propionate Supplementation on Performance, Ovarian Follicle Diameter, and Puberty Attainment in Replacement Angus Heifers.
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ID: 330669
2026
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Abstract
Abstract This study evaluated the effects of chromium propionate (CrP) supplementation on growth performance, ovarian follicle diameter, and puberty attainment in replacement Angus heifers over a 138-d period. Thirty-four heifers were stratified by age and body weight (BW) and randomly assigned to one of two treatments: 1) supplementation with dried distillers’ grains plus a commercial mineral mix at 0.91 kg·hd⁻¹·d⁻¹ (CON; n = 17); or 2) the same supplementation including 10 g of CrP (CrP; n = 17; KemTRACE® Chromium 0.04%, Kemin Industries, Inc., Des Moines, IA). Heifers were maintained on a single pasture equipped with SmartFeed® bunks (C-Lock Inc., Rapid City, SD) to monitor individual supplement intake. Body weight was recorded on days 0 and 138 following a 16-h feed and water withdrawal, and average daily gain (ADG) was calculated as the difference between final and initial BW divided by the number of days. Blood samples were collected every 7 d to determine plasma progesterone concentrations, and puberty attainment was defined as progesterone ≥ 1 ng/mL in two consecutive samples. Heifers were subjected to an estrus synchronization protocol consisting of gonadotropin-releasing hormone (GnRH) administration and controlled internal drug-releasing (CIDR) insertion (day −18 of the synchronization protocol). On day −9, prostaglandin F₂α (PGF) was administered and the CIDR was removed. Forty-eight hours later, a second GnRH injection was administered with CIDR reinsertion. On day −2, PGF was administered and the CIDR was removed. Ovarian ultrasonography was performed on days −2 and 0 to measure the diameter of the largest follicle. Data were analyzed using the GLIMMIX and MIXED procedures of SAS, with heifer as the experimental unit and treatment as a fixed effect. As designed, age and initial BW did not differ (P > 0.90) between treatments (9 ± 0.11 mo; 227 ± 6.26 kg). Supplement intake was also similar (P = 0.13) between treatments (0.67 and 0.73 kg·hd⁻¹·d⁻¹ for CON and CrP, respectively). Heifers supplemented with CrP tended to have greater final BW (P = 0.07; 326 vs. 311 ± 5.62 kg) and ADG (P = 0.07; 728 vs. 621 ± 40.5 g) compared with CON heifers. Additionally, CrP heifers had a greater (P = 0.05) diameter of the largest follicle (12.1 vs. 11.0 ± 0.36 mm). However, no treatment effects were observed (P = 0.34) for puberty attainment. In summary, CrP supplementation tended to improve growth performance and increased ovarian follicle diameter but did not affect puberty attainment.
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| Authors | Fernando Cidrini, Rodrigo S Marques, Erollykens Ferreira Santos, Arnaldo Cintra Limede, Frank Even, Abigayle Pollock, Camila Ezepha, Gustavo Begalli, Vitor Mercadante, Fernando H. Biase |
| Journal | italian journal of animal science |
| Year | 2026 |
| DOI |
10.1093/jas/skag272.252
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| URL | |
| Keywords | Keywords not found |
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