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Revista Veterinaria Zacatecas 2004 - UAZ

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24. Deschamps JC, Ott RS, Weston PG,<br />

Shanks RD, Kesler DJ, Bolt DJ, Hixon<br />

JE. Effects of zeranol on reproduction in<br />

beef bulls: Luteinizing hormone, follicle<br />

stimulating hormone and testosterone<br />

secretion in response to gonadotropinreleasing<br />

hormone and human chorionic<br />

gonadotropin. Am J Vet Res 1987; 48:<br />

31-36.<br />

25. Gray DG, Unruh JA, Dikeman ME,<br />

Stevenson JS. Implanting young bulls<br />

M A Gómez-Armendáriz et al.<br />

ABSTRACT<br />

from birth to four slaughter ages: III.<br />

Growth performance and endocrine<br />

aspects. J Anim Sci 1986; 63: 747-756.<br />

26. Amann RP, Wise ME, Glass JD, Nett<br />

TM. Prepuberal changes in the<br />

hypothalamic-pituitary axis of Holstein<br />

bulls. Biol Reprod 1986; 34: 71-80.<br />

27. Schanbacher BD. Regulation of<br />

luteinizing hormona secretion in male<br />

sheep by endogenous estrogen.<br />

Endocrinology 1984; 115: 944-950.<br />

Gómez-Armendáriz MA, Juan Ignacio Dávila Félix JI, Escobar Medina FJ. Weight gain in sheep<br />

treated with zeranol. Forty Khatadine x Dorper lambs (20 male and 20 female) received no treatment or 1 ml<br />

of Zeramec/50 Kg on 3 days after weaning (10 male and 10 female/group). Animals had a libitum access of<br />

water, sat, minerals and diet that covered their nutritional requirements; and were weighted and determined<br />

their feed intake every 28 days. After 90 days, the average weight gain was 9.25 and 11.60 Kg in the males<br />

treated with Zeramec and no treated, respectively; and 6.67 and 9.20 Kg in the females. The differences were<br />

not statistically significant (P>0.05). The feed intake was increased (P

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