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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 photoperiod and food availability on pre-challenge plasma luteinizing hormone (LH) and testosterone. Towhees were either ad libitum fed (N=9) or food restricted (70% of ad libitum consumption; N=8) and initially exposed to short day lengths before being transferred to long days. The photostimulated increase in pre-challenge plasma luteinizing hormone (A) and testosterone (B) of adult male Abert's towhees was not significantly affected by food availability. Data points are means±s.e.m.
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JEB123042F2: Effect of photoperiod and food availability on pre-challenge plasma luteinizing hormone (LH) and testosterone. Towhees were either ad libitum fed (N=9) or food restricted (70% of ad libitum consumption; N=8) and initially exposed to short day lengths before being transferred to long days. The photostimulated increase in pre-challenge plasma luteinizing hormone (A) and testosterone (B) of adult male Abert's towhees was not significantly affected by food availability. Data points are means±s.e.m.

Mentions: Transfer from SD to LD increased pre-challenge plasma LH and testosterone in both ad libitum-fed and food-restricted birds (LH: F1,16=7.23, P=0.016; testosterone: F1,16=13.94, P=0.002; Fig. 2). However, there was neither a significant effect of food availability on pre-challenge plasma levels of these hormones (LH: F1,16=3.13, P=0.096; testosterone: F1,16=0.09, P=0.77; Fig. 2) nor a significant interaction between photoperiod and food availability (LH: F1,16=1.28, P=0.28; testosterone: F1,16=2.25, P=0.15; Fig. 2).Fig. 2.


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 photoperiod and food availability on pre-challenge plasma luteinizing hormone (LH) and testosterone. Towhees were either ad libitum fed (N=9) or food restricted (70% of ad libitum consumption; N=8) and initially exposed to short day lengths before being transferred to long days. The photostimulated increase in pre-challenge plasma luteinizing hormone (A) and testosterone (B) of adult male Abert's towhees was not significantly affected by food availability. Data points are means±s.e.m.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
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getmorefigures.php?uid=PMC4582157&req=5

JEB123042F2: Effect of photoperiod and food availability on pre-challenge plasma luteinizing hormone (LH) and testosterone. Towhees were either ad libitum fed (N=9) or food restricted (70% of ad libitum consumption; N=8) and initially exposed to short day lengths before being transferred to long days. The photostimulated increase in pre-challenge plasma luteinizing hormone (A) and testosterone (B) of adult male Abert's towhees was not significantly affected by food availability. Data points are means±s.e.m.
Mentions: Transfer from SD to LD increased pre-challenge plasma LH and testosterone in both ad libitum-fed and food-restricted birds (LH: F1,16=7.23, P=0.016; testosterone: F1,16=13.94, P=0.002; Fig. 2). However, there was neither a significant effect of food availability on pre-challenge plasma levels of these hormones (LH: F1,16=3.13, P=0.096; testosterone: F1,16=0.09, P=0.77; Fig. 2) nor a significant interaction between photoperiod and food availability (LH: F1,16=1.28, P=0.28; testosterone: F1,16=2.25, P=0.15; Fig. 2).Fig. 2.

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