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Negative energy balance in a male songbird, the Abert's towhee, constrains the testicular endocrine response to luteinizing hormone stimulation.

Davies S, Gao S, Valle S, Bittner S, Hutton P, Meddle SL, Deviche P - J. Exp. Biol. (2015)

Bottom Line: Energy deficiency can suppress reproductive function in vertebrates.Wild-caught birds were either ad libitum fed or energetically constrained via chronic food restriction during photoinduced reproductive development.Collectively, these observations suggest that energy deficiency has direct gonadal effects consisting of a decreased responsiveness to LH stimulation.

View Article: PubMed Central - PubMed

Affiliation: School of Life Sciences, Arizona State University, Tempe, AZ 85287, USA Scott.Davies@asu.edu.

No MeSH data available.


Related in: MedlinePlus

Effect of LH and gonadotropin-releasing hormone (GnRH) challenge on plasma testosterone. Adult male Abert's towhees were either ad libitum fed (N=9) or food restricted (70% of ad libitum consumption; N=8), and received both a GnRH challenge (A) and a LH challenge (B) while exposed to short days and again while exposed to long days. Food restriction suppressed the plasma testosterone response to a LH challenge, but there was no significant effect on a GnRH challenge. Data points are means±s.e.m., and points with identical letters are not significantly different (P>0.05, Tukey's HSD test).
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JEB123042F3: Effect of LH and gonadotropin-releasing hormone (GnRH) challenge on plasma testosterone. Adult male Abert's towhees were either ad libitum fed (N=9) or food restricted (70% of ad libitum consumption; N=8), and received both a GnRH challenge (A) and a LH challenge (B) while exposed to short days and again while exposed to long days. Food restriction suppressed the plasma testosterone response to a LH challenge, but there was no significant effect on a GnRH challenge. Data points are means±s.e.m., and points with identical letters are not significantly different (P>0.05, Tukey's HSD test).

Mentions: Plasma testosterone was affected by the two-way interaction between GnRH challenge and food availability (F1,16=10.34, P=0.005), and GnRH challenge and photoperiod (F1,16=11.86, P=0.003; Fig. 3A). Under SD, GnRH challenge significantly increased plasma testosterone in ad libitum-fed birds, but not in food-restricted birds. Under LD, GnRH challenge increased plasma testosterone by a similar degree in both ad libitum-fed and food-restricted birds. GnRH challenge increased plasma testosterone in ad libitum-fed and food-restricted LD-exposed birds to a higher level compared with ad libitum-fed and food-restricted SD-exposed birds.Fig. 3.


Negative energy balance in a male songbird, the Abert's towhee, constrains the testicular endocrine response to luteinizing hormone stimulation.

Davies S, Gao S, Valle S, Bittner S, Hutton P, Meddle SL, Deviche P - J. Exp. Biol. (2015)

Effect of LH and gonadotropin-releasing hormone (GnRH) challenge on plasma testosterone. Adult male Abert's towhees were either ad libitum fed (N=9) or food restricted (70% of ad libitum consumption; N=8), and received both a GnRH challenge (A) and a LH challenge (B) while exposed to short days and again while exposed to long days. Food restriction suppressed the plasma testosterone response to a LH challenge, but there was no significant effect on a GnRH challenge. Data points are means±s.e.m., and points with identical letters are not significantly different (P>0.05, Tukey's HSD test).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4582157&req=5

JEB123042F3: Effect of LH and gonadotropin-releasing hormone (GnRH) challenge on plasma testosterone. Adult male Abert's towhees were either ad libitum fed (N=9) or food restricted (70% of ad libitum consumption; N=8), and received both a GnRH challenge (A) and a LH challenge (B) while exposed to short days and again while exposed to long days. Food restriction suppressed the plasma testosterone response to a LH challenge, but there was no significant effect on a GnRH challenge. Data points are means±s.e.m., and points with identical letters are not significantly different (P>0.05, Tukey's HSD test).
Mentions: Plasma testosterone was affected by the two-way interaction between GnRH challenge and food availability (F1,16=10.34, P=0.005), and GnRH challenge and photoperiod (F1,16=11.86, P=0.003; Fig. 3A). Under SD, GnRH challenge significantly increased plasma testosterone in ad libitum-fed birds, but not in food-restricted birds. Under LD, GnRH challenge increased plasma testosterone by a similar degree in both ad libitum-fed and food-restricted birds. GnRH challenge increased plasma testosterone in ad libitum-fed and food-restricted LD-exposed birds to a higher level compared with ad libitum-fed and food-restricted SD-exposed birds.Fig. 3.

Bottom Line: Energy deficiency can suppress reproductive function in vertebrates.Wild-caught birds were either ad libitum fed or energetically constrained via chronic food restriction during photoinduced reproductive development.Collectively, these observations suggest that energy deficiency has direct gonadal effects consisting of a decreased responsiveness to LH stimulation.

View Article: PubMed Central - PubMed

Affiliation: School of Life Sciences, Arizona State University, Tempe, AZ 85287, USA Scott.Davies@asu.edu.

No MeSH data available.


Related in: MedlinePlus