Leptin Prevents Posthibernation Weight Gain But Does Not Reduce Energy Expenditure in Arctic Ground Squirrels

Author(s):  
Bert B Boyer ◽  
Olav A Ormseth ◽  
Loren Buck ◽  
Margery Nicolson ◽  
Mary Ann Pelleymounter ◽  
...  
2021 ◽  
Vol 65 (11) ◽  
pp. 2170027
Author(s):  
Karen Alejandra Méndez‐Lara ◽  
Elisabeth Rodríguez‐Millán ◽  
David Sebastián ◽  
Rosi Blanco‐Soto ◽  
Mercedes Camacho ◽  
...  

2010 ◽  
Vol 91 (5) ◽  
pp. 1251-1260 ◽  
Author(s):  
Oliver E. Barker ◽  
Andrew E. Derocher

1981 ◽  
Vol 59 (6) ◽  
pp. 999-1004 ◽  
Author(s):  
D. A. Boag ◽  
J. O. Murie

Annual weight gain in Columbian ground squirrels (Spermophilus columbianus) was studied over a period of 7 years in a large colony in southwestern Alberta. Juveniles approximately tripled their weight during the period from emergence to immergence, achieving about 60% of adult weight at onset of their first hibernation. Males were heavier than females and the weight gain in both sexes varied significantly among years. The weight characteristics of the age-classes up to 3 years were different from one another. Full potential weight was not achieved until squirrels were in their fourth summer. Males were always significantly heavier than females in nonjuvenile squirrels and the amount of weight gained by these classes varied significantly among years.


1987 ◽  
Vol 110 (5) ◽  
pp. 753-759 ◽  
Author(s):  
Karl F. Schulze ◽  
Mark Stefanski ◽  
Julia Masterson ◽  
Regina Spinnazola ◽  
Rajasekhar Ramakrishnan ◽  
...  

2005 ◽  
Vol 80 (6) ◽  
pp. 862-868 ◽  
Author(s):  
Xiongwei Zhu ◽  
Mark A. Smith ◽  
George Perry ◽  
Yang Wang ◽  
Austin P. Ross ◽  
...  

2021 ◽  
Vol 12 ◽  
Author(s):  
Alessio Basolo ◽  
Takafumi Ando ◽  
Douglas C. Chang ◽  
Tim Hollstein ◽  
Jonathan Krakoff ◽  
...  

ObjectiveCirculating albumin is negatively associated with adiposity but whether it is associated with increased energy intake, lower energy expenditure or weight gain has not been examined.MethodsIn study 1 (n=238; 146 men), we evaluated whether fasting albumin concentration was associated with 24-h energy expenditure and ad libitum energy intake. In study 2 (n=325;167 men), we evaluated the association between plasma albumin and change in weight and body composition.ResultsAfter adjustment for known determinants of energy intake lower plasma albumin concentration was associated with greater total daily energy intake (β= 89.8 kcal/day per 0.1 g/dl difference in plasma albumin, p=0.0047). No associations were observed between plasma albumin concentrations and 24-h energy expenditure or 24-h respiratory quotient (p>0.2). Over 6 years, volunteers gained on average 7.5 ± 11.7 kg (p<0.0001). Lower albumin concentrations were associated with greater weight [β=3.53 kg, p=0.039 (adjusted for age, sex, follow up time), CI 0.16 to 6.21 per 1 g/dl difference albumin concentration] and fat mass (β=2.3 kg, p=0.022), respectively, but not with changes in fat free mass (p=0.06).ConclusionsLower albumin concentrations were associated with increased ad libitum food intake and weight gain, indicating albumin as a marker of energy intake regulation.Clinical Trial RegistrationClinicalTrials.gov, identifiers NCT00340132, NCT00342732.


2018 ◽  
Vol 5 (1) ◽  
pp. 70-76
Author(s):  
Debbye Chávez ◽  
Julio Villacres Matías

El presente estudio guarda estrecha relación con la alimentación de caprinos, las ganancias de peso y su producción; sabiendo que, para que un animal logre buenos rendimientos productivos se hace necesaria una alimentación que cubra necesidades energéticas de mantenimiento, luego de crecimiento y ganancia de peso o de producción; se determinó el recorrido en unidades de desplazamiento; luego, por medio de fórmulas de medición energética trasformar esto a energía metabolizable que es una unidad fácilmente relacionable con las necesidades energéticas de mantenimiento y de producción, siendo 60 cabras de diferentes razas las que se consideraron en este estudio, donde se registró su peso, y edad antes de que formen parte del ensayo. Con la ayuda de podómetros calibrados para usarlos en cabras, se determinó el recorrido habitual. Los podómetros fueron colocados en uno de sus miembros posteriores a la altura de la rodilla, y retirados 24h después, registrando su desplazamiento y actividades en busca del alimento. Utilizando Excel se procedió a la tabulación y organización de los datos, que fueron sometidos a estadística descriptiva y análisis de la información, como resultado se evidenció 5Km de recorridos por animal, con edades entre 2,5 años de promedios, de igual forma las razas de cabras más frecuentes fueron, en primer lugar la Criolla y en segundo la Nubia; ambas razas de animales no se diferenciaron en el recorrido y peso, lo que permitió utilizar una forma universal de estimación del gasto energético (0,49 kcal/kg /km) pudiéndose determinar que fueron 87,69Kcal involucradas en 24h de actividad. ABSTRACT This study is closely related to feeding goats, weight gain and production; knowing that, for an animal to achieve good production yields a feed that covers maintenance energy requirements is necessary , after growth and weight gain or production a route was determined in units of displacement; then by using formulas of energetic measurement transform these to metabolizable energy which is a easily relatable unit with the energetic requirements of maintenance and production, 60 goats from different races were considered in this study, in which their weight and ages were recorded before forming part of the test. With the help of pedometers calibrated for use in goats, the usual route is determined. Pedometers were placed in one of his post-kneemembers, and retired after 24h, recording their movement and activities in search of food. Using Excel proceeded to the tabulation and organization of data, which were subjected to descriptive statistics and analysis of information, as a result of tours 5Km animal showed, aged 2.5 years average, similarly races more frequent goats were first Creole and secondly the Nubia; both breeds of animals did not differ in the way and weight, enabling use a universal way to estimate energy expenditure (0.49 kcal / kg / km) being able to determine which were involved in 24h 87,69Kcal activity.


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