Geology Reports⌕ Search
Home/Archive/USGS

USGS · 5221614

The influence of hunger on meal to pellet intervals in barred owls

G.E. Duke·M.R. Fuller·B.J. Huberty
View original source ↗Export metadata ↓

Abstract

1. Barred owls fed at a sub-maintenance (SM) level had significantly (P < 0.01) longer meal to pellet intervals (MPI)/g eaten/kg body weight (BW) than those fed at an above maintenance (AM) level; MPI/g per kg for owls fed at a maintenance (M) level was intermediate but significantly (P < 0.01) different from both SM and AM. 2. During SM feeding, MPI/g per kg gradually increased. 3. The proportion of a meal occurring in a pellet was less in “hungry” owls whether losing weight (SM) or gaining (AM) as compared to owls maintaining their normal body weight (M). 4. SM fed owls appear to be able to increase digestion time as well as thoroughness of digestion.

Explore related subjects

Comparative Biochemistry and Physiology, Part A: PhysiologyArticle

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

G.E. Duke, M.R. Fuller, B.J. Huberty. 1980. The influence of hunger on meal to pellet intervals in barred owls. https://doi.org/10.1016/0300-9629(80)90152-8

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related USGS reports

USGS1996

Kangaroo rat bone compared to white rat bone after short-term disuse and exercise

Kangaroo rats ( Dipodomys ordii ) were used to study the effects of confinement on mechanical properties of bone with a long range objective of proposing an alternative to the white rat model for the study of disuse osteoporosis. Kangaroo rats exhibit bipedal locomotion, which subjects their limbs to substantial accelerative forces in addition to the normal stress of weight bearing. We subjected groups of kangaroo rats and white rats ( Rattus norvegicus ) to one of two confinement treatments or to an exercise regime; animals were exercised at a rate calculated to replicate their (respective) daily exercise patterns. White laboratory rats were used as the comparison because they are currently the accepted model used in the study of disuse osteoporosis. After 6 weeks of treatment, rats were killed and the long bones of their hind limbs were tested mechanically and examined for histomorphometric changes. We found that kangaroo rats held in confinement had less ash content in their hind limbs than exercised kangaroo rats. In general, treated kangaroo rats showed morphometric and mechanical bone deterioration compared to controls and exercised kangaroo rats appeared to have slightly “stronger” bones than confined animals. White rats exhibited no significant differences between treatments. These preliminary results suggest that kangaroo rats may be an effective model in the study of disuse osteoporosis.

Comparative Biochemistry and Physiology, Part A: P↗
USGS1995

Protein retention and liver aminotransferase activities in Atlantic salmon fed diets containing different energy sources

Atlantic salmon ( Salmo salar ) fingerlings (14.4 g) were fed diets containing either glucose, dextrin, raw corn starch and lipid, or a high protein U.S. Fish and Wildlife Service open-formula diet (ASD2-30) for 12 weeks. Significant differences in weight gain and feed: gain ratio were not observed among salmon fed the diets containing glucose, dextrin or ASD2-30. Diets containing dextrin and glucose supported greater protein retention and reduction in alanine aminotransferase activity than the other diets. Activity of aspartate aminotransferase was not affected by the dietary treatment. Protein retention correlated highly with alanine aminotransferase activity.

Comparative Biochemistry and Physiology, Part A: P↗
USGS1993

Elemental composition of a migratory and a land-locked strain of Atlantic salmon Salmo salar

1. The growth and elemental composition of an anadromous strain and a land-locked strain of Atlantic salmon ( Salmo salar ) were compared. 2. All fish were raised from the egg stage under identical conditions. 3. The land-locked strain was significantly higher in lipids than the anadromous strain throughout the study. 4. Results of exposure to seawater at 2-week intervals between days 431 and 512 of the study indicated that neither strain produced smolts. 5. Strains could not be separated by discriminant analysis into separate groups, based on concentrations of the six most abundant elements or all ten elements sampled during the expected period of smolting (days 440–550). 6. The laboratory fish differed significantly in composition from those collected in the Merrimack River. 7. The log e of the whole-body element content increased significantly with log e of wet body wt in both strains.

Comparative Biochemistry and Physiology, Part A: P↗