The involvement of dopaminergic system on LH secretion Nelore heifers
Abstract
The aim of this study was to evaluate the response of sulpiride administration (dopamine D2 antagonist, 0.59 m/kg body weight, s.c. and blood collected every 15 min for 10 h thereafter) on Luteinizing Hormone (LH) secretion in B. indicus pre-pubertal heifers at 8, 12 and 16 month of age. LH was quantified by RIA, sensitivity (0.039 ng/ml) and CV (15.51%). In heifers given sulpiride treatment didn’t differ (P≥0.05) in LH concentration, total secretion area, peak total area, number of peaks, area of highest secretion peak and time to highest peak occurrence and maximum LH secretion, from control group. The results suggest absence of dopamine D2 antagonist effect on LH secretion in pre-pubertal Nellore heifers, didn’t neurotransmitter participating on sexual maturation.Downloads
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Published
2009-12-16
Issue
Section
Animal Reproduction
License
Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons