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1

Analysis of feeding strategies for small-scale dairy systems in central Mexico using linear programming

100%
Val-Arreola, Kebreab E., Mills J. A. N., France J.
Journal of Animal and Feed Sciences
|
2005
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tom 14
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nr 4
607-624
2

Digestion, defecation and food passage rate in the insectivorous bat Myotis myotis

100%
Stalinski J.
Acta Theriologica
|
1994
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tom 39
|
nr 1
The coefficient of dry mass digestibility (DMD) in the insectivorous bat Myotis myotis (Borkhausen, 1797), fed American cockroaches, is 69.3%. This is comparable with the average digestibility and assimilation coefficients in insectivorous mammals and birds, but it is much lower than estimated in previous studies on Insectivorous bats. The rate of passage of food marked with basic fuchsin (ts = 25, tso = 44, tso = 77 minutes) and the defecation rate indicate extremely rapid digestion of food, which is connected with the feeding and foraging strategies of insectivorous bats. It is con­cluded, that previous estimations of bats' food consumption under natural conditions were lowered by the assumption of high digestibility of food or insignificant amount of feces defecated outside the rest place.
3

Diet selection by Spanish ibex in early summer in Sierra Nevada

100%
Martinez T.
Acta Theriologica
|
2000
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tom 45
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nr 3
Feeding strategy of the Spanish ibex Capra pyrenaica Schinz, 1838 was compared in two altitudinal zones of the Sierra Nevada, the high zone between 2700 and 3300 m a.s.l. and the mid-altitude zone between 2000 and 2700 m a.s.l. The study was carried out in July, and primarily focused on diet selection. Food availability, diet composition, species selection indices, and the effect of plant availability and chemical composition on diet selection in each zone were analysed. In the high zone, the availability of herbaceous resources was much greater than that of woody species, while in the mid-altitude zone, both resource types were almost equally abundant. Resource availability in both zones had a 36% index of similarity. Herbaceous plants were the predominant dietary component in both zones, and diet similarity was 51%. The greater similarity found between the two diet compositions than between the two resource availabilities revealed preferences for common species in both zones. The Spanish ibex selected food items with moderate levels in diet composition, a degree of quality (high protein content and digestibility) and moderate availability. In the high zone, the ibex selected its diet according to the protein content, while in the mid-altitude zone the food choice was mainly influenced by availability. Spatial heterogeneity probably influenced the difference detected in terms of the feeding strategy used in each area.
4

Feeding strategy of wintering rooks Corvus frugilegus L. in urban habitats

80%
Jadczyk P., Drzeniecka-Osiadacz A.
Polish Journal of Ecology
|
2013
|
tom 61
|
nr 3
Rooks show a growing tendency to winter in cities. The aim of this study was to determine the influence of meteorological factors on the selection of feeding habitats and to discuss the diversity of feeding strategies in urban environments of different sizes and housing densities. The study was carried out in two cities in south-western Poland, Wrocław and Brzeg (populations of 636,000 and 39,000, respectively), in the years 2004–2008. Nineteen research areas differing in housing density were controlled once a week. In multiple regression, the number of rooks feeding in urban environments showed a correlation with air temperature and the thickness of snow cover. The densities of feeding rooks were higher in urban environments than in agrocenoses. They were also higher in Wrocław than in Brzeg, and in built-up areas than in undeveloped ones. Feeding groups were smaller in Brzeg than in Wrocław. They were also smaller in built-up areas in Brzeg than in undeveloped ones. More rooks fed individually in Brzeg than in Wrocław. The diversity in the frequency of individually feeding rooks in built-up and undeveloped environments was specific to each city. Rooks feeding in Brzeg were more active in searching for food than those in Wrocław, and birds feeding on optimum, undeveloped feeding grounds were more active than those in built-up areas . In both cities, rooks were fed by humans, mainly in built-up areas.
5

Feeding strategies and resource utilization of 0plus perch, Perca fluviatilis L., in littoral zones of shallow lakes

80%
Bogacka-Kapusta E., Kapusta A.
Archives of Polish Fisheries
|
2010
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tom 18
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nr 3
6

Distribution patterns and feeding strategies of lysianassoid amphipods in shallow waters of an Arctic fjord

80%
Legezynska J.
Polish Polar Research
|
2001
|
tom 22
|
nr 3-4
7

Summer feeding strategy of Spanish ibex Capra pyrenaica and domestic sheep Ovis aries in South-Eastern Spain

80%
Martinez T.
Acta Theriologica
|
2002
|
tom 47
|
nr 4
The feeding strategies of the Spanish ibex Capra pyrenaica Schinz, 1838 and sheep Ovis aries Linnaeus, 1758 during summer in the alpine area of Sierra Nevada in south-eastern Spain were compared. The degree of vegetation use by the two ungulates, food availability, diet composition, species selection indices and the effect of plant availability and chemical composition on diet selection were analysed. The available biomass of herbaceous and woody resources was 87 and 13%, respectively. The degree of use was 15% for herbaceous vegetation and 10.3% for woody vegetation. The most used species were those with moderate amounts in diet composition of both ruminants. The main plant groups consumed by Spanish ibex were graminoids (57.5%), shrubs (20.5%) and chamaephytes (14.3%). Sheep consumed graminoids (41.6%), forbs (32.3%) and chamaephytes (20.9%). There was a significant correlation between the two diets, with an overlap of 56.3%. The highest indices of selection were found in items with moderate-low availability and which comprised moderate levels in the diet composition of the two species. Spanish ibex mainly selected diet according to availability, while sheep selection depended on protein content. The ibex consumed cell wall-rich resources such as grasses and shrubs, while the sheep consumed higher quality feed and includes more forbs in its diet.
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