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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 food availability on adult male Abert's towhees, Melozone aberti. Towhees were either ad libitum fed (N=9) or food restricted (70% of ad libitum consumption; N=8). Food availability modulated body mass (A), furcular fat (B) and pectoral muscle (C), but had no significant effect on cloacal protuberance width (D). The pectoral muscle graph depicts medians and half interquartile range, whereas the remaining graphs show means±s.e.m. Points with identical letters are not significantly different (P>0.05, Tukey's HSD test). SD, short days; LD, long days.
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JEB123042F1: Effect of food availability on adult male Abert's towhees, Melozone aberti. Towhees were either ad libitum fed (N=9) or food restricted (70% of ad libitum consumption; N=8). Food availability modulated body mass (A), furcular fat (B) and pectoral muscle (C), but had no significant effect on cloacal protuberance width (D). The pectoral muscle graph depicts medians and half interquartile range, whereas the remaining graphs show means±s.e.m. Points with identical letters are not significantly different (P>0.05, Tukey's HSD test). SD, short days; LD, long days.

Mentions: Body mass was affected by food availability (F1,16=15.33, P=0.001), time (F2,32=127.22, P<0.001) and the interaction between these factors (F2,32=121.50, P<0.001; Fig. 1). Body mass of ad libitum-fed birds was similar throughout the experiment (Tukey's HSD, P>0.05), whereas body mass of food-restricted birds decreased after 2 weeks (Tukey's HSD, P<0.05), and remained at the reduced level for the duration of the study.Fig. 1.


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 food availability on adult male Abert's towhees, Melozone aberti. Towhees were either ad libitum fed (N=9) or food restricted (70% of ad libitum consumption; N=8). Food availability modulated body mass (A), furcular fat (B) and pectoral muscle (C), but had no significant effect on cloacal protuberance width (D). The pectoral muscle graph depicts medians and half interquartile range, whereas the remaining graphs show means±s.e.m. Points with identical letters are not significantly different (P>0.05, Tukey's HSD test). SD, short days; LD, long days.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

JEB123042F1: Effect of food availability on adult male Abert's towhees, Melozone aberti. Towhees were either ad libitum fed (N=9) or food restricted (70% of ad libitum consumption; N=8). Food availability modulated body mass (A), furcular fat (B) and pectoral muscle (C), but had no significant effect on cloacal protuberance width (D). The pectoral muscle graph depicts medians and half interquartile range, whereas the remaining graphs show means±s.e.m. Points with identical letters are not significantly different (P>0.05, Tukey's HSD test). SD, short days; LD, long days.
Mentions: Body mass was affected by food availability (F1,16=15.33, P=0.001), time (F2,32=127.22, P<0.001) and the interaction between these factors (F2,32=121.50, P<0.001; Fig. 1). Body mass of ad libitum-fed birds was similar throughout the experiment (Tukey's HSD, P>0.05), whereas body mass of food-restricted birds decreased after 2 weeks (Tukey's HSD, P<0.05), and remained at the reduced level for the duration of the study.Fig. 1.

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