Get access

Changes in intramuscular fat, fatty acid profile and cholesterol content induced by zeranol implantation strategy in hair lambs

Authors

  • Nidia V Valenzuela-Grijalva,

    1. Laboratorio de Investigación en Carne y Productos Cárnicos, Centro de Investigación en Alimentación y Desarrollo AC, Hermosillo, Sonora 83000, México
    Search for more papers by this author
  • Humberto González-Rios,

    Corresponding author
    1. Laboratorio de Investigación en Carne y Productos Cárnicos, Centro de Investigación en Alimentación y Desarrollo AC, Hermosillo, Sonora 83000, México
    • Laboratorio de Investigación en Carne y Productos Cárnicos, Centro de Investigación en Alimentación y Desarrollo AC, Hermosillo, Sonora 83000, México.
    Search for more papers by this author
  • Thalia Y Islava,

    1. Laboratorio de Investigación en Carne y Productos Cárnicos, Centro de Investigación en Alimentación y Desarrollo AC, Hermosillo, Sonora 83000, México
    Search for more papers by this author
  • Martin Valenzuela,

    1. Laboratorio de Investigación en Carne y Productos Cárnicos, Centro de Investigación en Alimentación y Desarrollo AC, Hermosillo, Sonora 83000, México
    Search for more papers by this author
  • Gastón Torrescano,

    1. Laboratorio de Investigación en Carne y Productos Cárnicos, Centro de Investigación en Alimentación y Desarrollo AC, Hermosillo, Sonora 83000, México
    Search for more papers by this author
  • Juan P Camou,

    1. Laboratorio de Investigación en Carne y Productos Cárnicos, Centro de Investigación en Alimentación y Desarrollo AC, Hermosillo, Sonora 83000, México
    Search for more papers by this author
  • Francisco A Núñez-González

    1. Facultad de Zootecnia, Universidad Autónoma de Chihuahua, Chihuahua, Chih. 85000, México
    Search for more papers by this author

Abstract

BACKGROUND: The effect of zeranol implantation strategy on intramuscular fat, fatty acid profile and cholesterol content of the longissimus dorsi muscle of hair lambs was studied. Four treatments were tested: C, control group; Z12, 12 mg zeranol; Z24, 24 mg zeranol in a single application; and RZ12, 12 mg zeranol given twice. One-way analysis of variance was employed to estimate the effect of treatments (P < 0.05). To separate the effect of the mean, orthogonal contrasts were tested: C1, C versus Z12 + Z24 + RZ12; C2, Z12 versus Z24 + RZ12; and C3, Z24 versus RZ12.

RESULTS: A decrease (P < 0.05) in intramuscular fat content was observed from implanting (C1 effect) and zeranol reimplantation (C3 effect). Implanted lambs exhibited an increase (P < 0.05) in monounsaturated fatty acids compared with control group (40.60% versus 35.35%). All contrasts were significant for the sum of n-6 and n-3, with values lower (P < 0.05) in the control (n-6: 0.84% and n-3: 1.38%) and higher in the RZ12 treatment (n-6: 7.55% and n-3: 14.9%). Cholesterol decreased by 78% with implantation and increasing the dose.

CONCLUSION: The results indicate that it is possible to induce favorable changes in the fatty acid profile and cholesterol content using a zeranol implantation strategy on hair lambs. Copyright © 2011 Society of Chemical Industry

Get access to the full text of this article

Ancillary