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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

Correlation between the effects of LH and GnRH challenges on plasma testosterone. (A) The increase in plasma testosterone in response to GnRH challenge was correlated with the increase in plasma testosterone in response to LH challenge in long day ad libitum-fed adult male Abert's towhees. (B) By contrast, no such correlation was found in long day food-restricted towhees. Each point represents one individual. Note that the scales of the axes differ between the two panels.
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JEB123042F4: Correlation between the effects of LH and GnRH challenges on plasma testosterone. (A) The increase in plasma testosterone in response to GnRH challenge was correlated with the increase in plasma testosterone in response to LH challenge in long day ad libitum-fed adult male Abert's towhees. (B) By contrast, no such correlation was found in long day food-restricted towhees. Each point represents one individual. Note that the scales of the axes differ between the two panels.

Mentions: The increase in plasma testosterone induced by GnRH challenge was correlated with the increase in plasma testosterone induced by LH challenge in LD-exposed ad libitum-fed birds (R2=0.94, P<0.0001; Fig. 4A), but not in LD-exposed food-restricted birds (R2=0.12, P=0.36; Fig. 4B).Fig. 4.


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)

Correlation between the effects of LH and GnRH challenges on plasma testosterone. (A) The increase in plasma testosterone in response to GnRH challenge was correlated with the increase in plasma testosterone in response to LH challenge in long day ad libitum-fed adult male Abert's towhees. (B) By contrast, no such correlation was found in long day food-restricted towhees. Each point represents one individual. Note that the scales of the axes differ between the two panels.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

JEB123042F4: Correlation between the effects of LH and GnRH challenges on plasma testosterone. (A) The increase in plasma testosterone in response to GnRH challenge was correlated with the increase in plasma testosterone in response to LH challenge in long day ad libitum-fed adult male Abert's towhees. (B) By contrast, no such correlation was found in long day food-restricted towhees. Each point represents one individual. Note that the scales of the axes differ between the two panels.
Mentions: The increase in plasma testosterone induced by GnRH challenge was correlated with the increase in plasma testosterone induced by LH challenge in LD-exposed ad libitum-fed birds (R2=0.94, P<0.0001; Fig. 4A), but not in LD-exposed food-restricted birds (R2=0.12, P=0.36; Fig. 4B).Fig. 4.

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