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

Autor: Valenzuela-Grijalva NV; Laboratorio de Investigación en Carne y Productos Cárnicos, Centro de Investigación en Alimentación y Desarrollo AC, Hermosillo, Sonora 83000, México., González-Rios H, Islava TY, Valenzuela M, Torrescano G, Camou JP, Núñez-González FA
Jazyk: angličtina
Zdroj: Journal of the science of food and agriculture [J Sci Food Agric] 2012 May; Vol. 92 (7), pp. 1362-7. Date of Electronic Publication: 2011 Dec 05.
DOI: 10.1002/jsfa.4707
Abstrakt: 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.)
Databáze: MEDLINE
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