Academic Journal
95 Effects of Three Implant Programs on Growth Performance, Carcass Outcomes, and Weekly Activity Minutes of Finishing Steers Fed Different Days on Feed
| العنوان: | 95 Effects of Three Implant Programs on Growth Performance, Carcass Outcomes, and Weekly Activity Minutes of Finishing Steers Fed Different Days on Feed |
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| المؤلفون: | Martinez, Socorro, Word, Alyssa B, Holland, Ben P, Karr, Kendall, Hutcheson, John P, Walter, Lee-Anne J, Richeson, John, Lawrence, Ty E, Samuelson, Kendall L |
| المصدر: | Journal of Animal Science ; volume 99, issue Supplement_3, page 49-49 ; ISSN 0021-8812 1525-3163 |
| بيانات النشر: | Oxford University Press (OUP) |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Genetics, Animal Science and Zoology, General Medicine, Food Science |
| الوصف: | This study evaluated the effects of a single slow-release implant compared to two re-implant programs administered at either 120 days on feed (DOF) or 80 days from harvest on performance, carcass characteristics, and activity of serially harvested feedlot cattle. Using a randomized complete block design, steers (n = 4,680) were randomly assigned to 72 pens and 1 of 12 treatments in a 3 × 4 factorial arrangement. Treatments were either a slow-release implant (SR), an initial slow-release implant followed by re-implant at 120 DOF (SR+RI-120), or an initial slow-release implant followed by re-implant 80 days from harvest (SR+RI-80) administered to cattle harvested at 166, 180, 194, or 208 DOF. A 3-axis accelerometer ear-tag was used in a subset (n =1,080) of animals to quantify rumination time and activity. No interactions (P ≥ 0.09) were observed for implant × DOF. Implant did not affect (P ≥ 0.25) final BW, ADG, or DMI, but re-implanted steers had a greater (P < 0.01) G:F ratio than SR. Re-implanted steers also had greater (P ≤ 0.03) HCW, dressed yield, and ribeye area, but less (P < 0.01) backfat, marbling, and empty body fat (EBF) compared to SR. Re-implanted steers had less (P < 0.01) choice and yield grade 4 and 5 carcasses than SR steers. As DOF increased, HCW, dressed yield, backfat, marbling, and EBF increased linearly (P < 0.01). The percentage of choice and yield grade 4 and 5 carcasses also increased (P < 0.01) linearly with additional DOF. An implant × day effect (P < 0.01) for weekly activity minutes suggests re-implanted steers had greater activity after re-implant administration. Re-implanting within the payout period of a slow-release implant increases feed efficiency, HCW, dressed yield, and activity minutes, but decreases carcass fatness and reduces quality grade regardless of timing of secondary implant administration. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| DOI: | 10.1093/jas/skab235.087 |
| الاتاحة: | http://dx.doi.org/10.1093/jas/skab235.087 http://academic.oup.com/jas/article-pdf/99/Supplement_3/49/40529395/skab235.087.pdf |
| Rights: | https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model |
| رقم الانضمام: | edsbas.2581F785 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1093/jas/skab235.087 |
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