Muscle fiber morphometry and physicochemical characteristics of the Longissimus thoracis muscle of hair male lambs fed zilpaterol hydrochloride and implanted with steroids.

Abstract

Muscle fiber morphometry and physicochemical characteristics were evaluated in LT muscles obtained from entire male lambs treated with zilpaterol hydrochloride (ZH, 0 and 0.15 mg/kg body weight) and/or steroidal implant (SI, with and without trenbolone acetate/estradiol). ZH and SI acted synergistically to increase LT area, type-IIb fiber cross-sectional area and soluble collagen content, likewise to decrease metmyoglobin concentration and insoluble collagen content. Ash content and ultimate pH showed a decrease due to an antagonistic effect between ZH and SI. Content of total collagen, protein, fat, moisture, oxidized lipids and water-holding capacity were unaffected by ZH and SI. Supplemental ZH, but not SI, decreased all color parameters and tended to increase shear force. Overall, the SI implantation of male lambs followed by a ZH supplementation promoted greater LT hypertrophy, without affecting protein and fat content, and physicochemical characteristics in their meat.

• Authors: M Ángeles López-Baca, Leonel Avendaño-Reyes, Ulises Macías-Cruz, Adriana Muhlia-Almazán, Martín Valenzuela-Melendres, Etna Aida Peña-Ramos, Thalia Y Islava-Lagarda, Humberto González-Rios
• Journal: Meat science (Meat Sci) Vol. 177 Pg. 108490 (Jul 2021) ISSN: 1873-4138 [Electronic] England
• PMID: 33744607 (Publication Type: Journal Article)
• Copyright: Copyright © 2021. Published by Elsevier Ltd.

Chemical References

• Adrenergic Agents
• Trimethylsilyl Compounds
• Zilpaterol
• Estradiol
• Trenbolone Acetate

Topics

• Adrenergic Agents (pharmacology)
• Animals
• Color
• Estradiol (pharmacology)
• Male
• Muscle Fibers, Skeletal (drug effects)
• Paraspinal Muscles (anatomy & histology, chemistry)
• Red Meat (analysis)
• Shear Strength
• Sheep, Domestic
• Trenbolone Acetate (pharmacology)
• Trimethylsilyl Compounds (pharmacology)