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• W1483151552 abstract "Since in nursing rabbits sexual receptivity and fertility achieved after AI appear to be depressed duringlactation, the effect of endogenous opioid peptides (EOP) on serum LH were investigated in lactatingrabbits (n=30) by administration of the opiate antagonist naloxone (nal). Blood samples were collectedevery 15 min for 4 h via an indwelling catheter inserted in the central ear artery. After the first h ofsampling, the rabbits received i.v. saline (SAL, n=10); nal (LN, 0.5 mg/kg, n=10); or nal (HN, 1.0mg/kg, n=10). The pulsar algorithmic procedure for the study of pulsatile hormone secretion was usedto calculate mean and basal LH concentrations, frequency and amplitude of LH pulses. Data from thestatistical analysis are presented as mean ± SE of area under the curve (AUC) units of LH response.Mean LH concentration during the 60 min pre-challenge period was 0.24±0.03 ng/ml. The AUC of LHduring that period did not differ among treatment groups (LN=16.6±4.1, HN=11.8±2.9 andSAL=14.3±4.0 area units). In the SAL group LH secretion remained low during the 4 h samplingperiod. Mean and basal LH concentrations were 0.21±0.05 ng/ml and 0.03±0.02 ng/ml (LN=0.59±0.13ng/ml and 0.20±0.04 ng/ml; HN=0.38±0.09 ng/ml and 0.13±0.03 ng/ml). The mean pulse peak was0.70±0.15 ng/ml (LN=1.95±0.37 ng/ml; HN=1.26±0.23 ng/ml), and the mean pulse amplitude was0.67±0.14 ng/ml (LN=1.89±0.36 ng/ml; HN=1.22±0.21 ng/ml). A lower number of pulses (1.88±0.35)was also detected for the 4 h period (LN=2.57±1.13; HN=2.34±1.11). Nal treatment increased LHrelease. A greater AUC was observed during the 60 min post nal period in both nal-treated groups(LN=55.0±15.5 and HN=38.8±10.3 vs. SAL=5.9±2.7 area units; P <0.01). Rabbits receiving 0.5 mg/kgnal had an increased (P <0.05) AUC (LN=105.9±26.1 area units) through 180 min after naladministration compared with the saline-treated group (SAL=34.9±9.2 area units). The group LNdiffered from the SAL group through the 180 min post-nal period, while the HN group differed onlyfor 60 min. Nal-treated groups (LN and HN) did not differ in either of the post-nal periods (60 and 180min). Since all the experimental rabbits presented a clear LH surge after the nal challenge, thesuppression of pituitary LH release has been shown to be associated with EOP activity. EOP may havemodulated hypothalamic secretion of GnRH, resulting in a tonic inhibition of LH secretion. However,further studies are necessary to better clarify EOP-cortisol interaction in the lactating rabbit doe at themoment of AI and after an i.m. injection of a GnRH analogue to induce ovulation." @default.
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• W1483151552 date "2008-01-01" @default.
• W1483151552 modified "2023-09-22" @default.
• W1483151552 title "Opioid inhibition of the pulsatile luteinizing hormone release as assessed by naloxone treatment in the lactating rabbit." @default.
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