Anabolic implants alter abundance of mRNA involved in muscle growth, metabolism, and inflammation in the longissimus of Angus steers in the feedlot.

Autor: Reichhardt CC; Department of Animal, Dairy and Veterinary Science, 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 Rd., Honolulu, HI, 96822, USA., Cuthbert JM; Department of Animal, Dairy and Veterinary Science, Utah State University, 4815 Old Main Hill, Logan, UT, 84322, USA; Department of Biology, Westminster College, 1840 South 1300 East, Salt Lake City, UT, 84105, USA., Motsinger LA; Department of Animal, Dairy and Veterinary Science, Utah State University, 4815 Old Main Hill, Logan, UT, 84322, USA; Department of Animal and Dairy Sciences, University of Georgia, 425 River Rd., Athens, GA, 30602, USA., Brady TJ; Department of Animal, Dairy and Veterinary Science, Utah State University, 4815 Old Main Hill, Logan, UT, 84322, USA., Briggs RK; Department of Animal, Dairy and Veterinary Science, Utah State University, 4815 Old Main Hill, Logan, UT, 84322, USA., Thomas AJ; Department of Animal, Dairy and Veterinary Science, Utah State University, 4815 Old Main Hill, Logan, UT, 84322, USA., Thornton KJ; Department of Animal, Dairy and Veterinary Science, 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 Jan; Vol. 82, pp. 106773. Date of Electronic Publication: 2022 Oct 23.
DOI: 10.1016/j.domaniend.2022.106773
Abstrakt: The majority of beef cattle in the United States often receive at least one anabolic implant resulting in improved growth, feed efficiency, and environmental and economic sustainability. However, the physiological and molecular mechanisms through which anabolic implants increase skeletal muscle growth of beef cattle remain elusive. The objective of this study was to identify transcriptional changes occurring in skeletal muscle of steers receiving anabolic implants containing different steroid hormones. Forty-eight steers were stratified by weight into 1 of 4 (n = 12/treatment) implant treatment groups: (1) estradiol (ImpE2; 25.7 mg E2; Compudose, Elanco Animal Health, Greenfield, IN), (2) trenbolone acetate (ImpTBA; 200 mg TBA; Finaplix-H, Merck Animal Health, Madison, NJ), (3) combination (ImpETBA; 120 mg TBA + 24 mg E2; Revalor-S, Merck Animal Health), or (4) no implant (CON). Skeletal muscle biopsies were taken from the longissimus 2 and 10 d post-implantation. The mRNA abundance of 94 genes associated with skeletal muscle growth was examined. At 10 d post-implantation, steers receiving ImpETBA had greater (P = 0.02) myoblast differentiation factor 1 transcript abundance than CON. Citrate synthase abundance was increased (P = 0.04) in ImpETBA steers compared to CON steers. In ImpE2 steers 10 d post-implantation, muscle RING finger protein 1 decreased (P = 0.05) compared to CON steers, and forkhead box protein O4 decreased (P = 0.05) in ImpETBA steers compared to CON steers. Interleukin-6 abundance tended to be increased (P = 0.09) in ImpE2 steers compared to both ImpETBA and CON steers. Furthermore, interleukin-10 mRNA abundance tended to be increased (P = 0.06) in ImpTBA steers compared to ImpETBA steers. Leptin receptor abundance was reduced (P = 0.01) in both ImpE2 and ImpTBA steers when compared to CON steers. Abundance of phosphodiesterase 4B was increased (P = 0.04) in ImpTBA steers compared to CON steers 2 d post-implantation. Taken together, the results of this research demonstrate that estradiol increases skeletal muscle growth via pathways related to nutrient partitioning and mitochondria function, while trenbolone acetate improves steer skeletal muscle growth via pathways related to muscle growth.
(Copyright © 2022 The Authors. Published by Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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