Relationship among cattle breed and anabolic implant protocol relative to feedlot performance: Growth, temperament, feeding behavior, carcass traits, and economic return.

Autor: Reichhardt CC; Department of Animal, Dairy, and Veterinary Sciences, Utah State University, 4815 Old Main Hill, Logan, UT, 84322, USA; Department of Human Nutrition, Food and Animal Sciences, University of Hawai'i at Mānoa, 1955 East-West Road, Honolulu, HI, 96822, USA., Bayles SA; Department of Animal, Dairy, and Veterinary Sciences, Utah State University, 4815 Old Main Hill, Logan, UT, 84322, USA., Feuz R; Department of Applied Economics, Utah State University, 4815 Old Main Hill, Logan, UT, 84322, USA., Motsinger LA; Department of Animal, Dairy, and Veterinary Sciences, Utah State University, 4815 Old Main Hill, Logan, UT, 84322, USA., Alberto AF; Department of Animal, Dairy, and Veterinary Sciences, Utah State University, 4815 Old Main Hill, Logan, UT, 84322, USA., Okamoto LL; Department of Animal, Dairy, and Veterinary Sciences, Utah State University, 4815 Old Main Hill, Logan, UT, 84322, USA., Brown BL; Department of Animal, Dairy, and Veterinary Sciences, Utah State University, 4815 Old Main Hill, Logan, UT, 84322, USA., Briggs RK; Department of Animal, Dairy, and Veterinary Sciences, Utah State University, 4815 Old Main Hill, Logan, UT, 84322, USA., Roholt BW; Department of Animal, Dairy, and Veterinary Sciences, Utah State University, 4815 Old Main Hill, Logan, UT, 84322, USA., Bowman BR; Department of Animal, Dairy, and Veterinary Sciences, Utah State University, 4815 Old Main Hill, Logan, UT, 84322, USA., Larsen R; Department of Human Nutrition, Food and Animal Sciences, University of Hawai'i at Mānoa, 1955 East-West Road, Honolulu, HI, 96822, USA., Garcia MD; Department of Animal, Dairy, and Veterinary Sciences, Utah State University, 4815 Old Main Hill, Logan, UT, 84322, USA., Thornton KJ; Department of Animal, Dairy, and Veterinary Sciences, Utah State University, 4815 Old Main Hill, Logan, UT, 84322, USA. Electronic address: kara.thornton@usu.edu.
Jazyk: angličtina
Zdroj: Domestic animal endocrinology [Domest Anim Endocrinol] 2023 Jul-Oct; Vol. 84-85, pp. 106806. Date of Electronic Publication: 2023 Jun 03.
DOI: 10.1016/j.domaniend.2023.106806
Abstrakt: Recent research has suggested that different cattle breed types may respond differently to anabolic implant protocols of varying intensity. Therefore, the purpose of this research was to compare anabolic implant protocols in feedlot steers of 2 different breed types. Sixty steers were stratified by weight and breed in a 2 × 3 factorial design examining 2 different breeds: Angus (AN; n=38) or Santa Gertrudis influenced (SG; n=22), and 3 implant strategies: no implant (CON; n=20), a moderate intensity implant protocol (d0 implant: Revalor-G, d56 implant: Revalor-IS, d112 implant: Revalor-S; MI; n=20), or a high intensity implant protocol (d0 implant: Revalor-IS, d56 implant: Revalor-S, d112 implant: Revalor-200; HI; n=20). Steers were randomly placed into pens equipped with GrowSafe bunks to collect dry matter intake and feeding behavior. All animals were fed the same diet. Weight, chute score, exit velocity, serum, rectal temperature, hip height and 12th rib fat thickness were collected approximately every 28 d over a 196 d period. Serum urea nitrogen (SUN) was evaluated as well. Total average daily gain was increased (P < 0.0001) in both the HI and MI steers compared to the CON steers by 29.4% and 26%, respectively. A treatment × breed interaction was observed (P < 0.0001) for hip height, with AN-CON steers being shorter (P < 0.0007) than AN-HI, SG-CON, SG-MI, and SG-HI steers. A breed × treatment interaction was observed (P < 0.004) for chute score and rectal temperature, with SG-HI and SG-MI steers having increased chute scores (P < 0.001) when compared to AN-HI, AN-MI, AN-CON, and SG-CON throughout the course of the trial. Additionally, SG-HI and SG-MI steers had an increased rectal temperature (P < 0.004) compared to AN-HI, AN-MI, AN-CON, and SG-CON steers. A breed effect was observed (P = 0.002) for SUN with AN steers having increased (P = 0.002) SUN concentration compared to SG sired steers, in addition to a treatment effect (P < 0.0001), with CON steers having a higher (P < 0.0001) SUN concentration than MI and HI steers, regardless of breed. The MI implant protocol increased net return per head, on average, by $97.28, regardless of breed, while the HI implant protocol increased net return by only $80.84. Taken together, despite the cattle breed types responding differently to the different anabolic implant protocols at times, a moderate intensity anabolic implant protocol was optimal in this experiment for steers raised in a temperate climate.
Competing Interests: Declaration of Interest None.
(Copyright © 2023 The Author(s). Published by Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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