نتایج جستجو برای: 0168
تعداد نتایج: 250 فیلتر نتایج به سال:
Rams express differences in sexual performance during the breeding season. Breeding rams with high sexual performance scores as measured during a sexual performance test can improve flock fertility. Whether selecting rams for high sexual performance score will indirectly improve ewe reproductive performance is not known. The objective of this study was to estimate the genetic correlation betwee...
Beginning in 1999, a web-based metadata and data repository we call the “open research system” (ORS) was designed and built to assist geographically distributed scientific research teams. The purpose of this innovation was to promote the open sharing of data within and across organizational lines and across geographic distances. As the use of the system continued, end users and group administra...
A landscape model (LEEMATH) to evaluate effects of management impacts on timber and wildlife habitat
Managing forest resources for sustainability requires the successful integration of economic and ecological goals. To attain such integration, land managers need decision support tools that incorporate science, land-use strategies, and policy options to assess resources sustainabil i ty at large scales. Landscape Evaluation of Effects of Management Activit ies on Timber and Habitat (LEEMATH) is...
This paper summarises recent findings on the causation of stereotypic behaviours and other abnormal repetitive behaviours (ARBs) in captive animals: primarily motivational frustration and/or brain dysfunction, with possible contributory roles also being played by habit-formation and ‘coping’ effects. We then review the extent to which ARBs occur in zoos and similar, estimating that at least 10 ...
Individual differences and causative factors could modify the behaviour of dogs in object related games played with a human partner. In a two-by-two within-subject design we observed 68 family dogs’ behaviour when playing two different types of games (ball game and tugging) with two different play partners (owner or unfamiliar experimenter) in order to categorize each dog’s playing style. In al...
The quantitative simulation of gross primary production (GPP) at various spatial and temporal scales has been a major challenge in quantifying the global carbon cycle. We developed a light use efficiency (LUE) daily GPP model from eddy covariance (EC) measurements. The model, called EC-LUE, is driven by only four variables: normalized difference vegetation index (NDVI), photosynthetically activ...
In a previous study, it has been shown that adult, non-reproductive female mice from a line Ž . Ž . selected for high litter size at birth S-line have higher residual feed intake RFI than females of Ž . a non-selected control line C-line . Several studies have indicated that a higher RFI is related to a higher activity level. Differences in activity may suggest underlying differences in coping ...
A comprehensive evaluation of energy balance closure is performed across 22 sites and 50 site-years in FLUXNET, a network of eddy covariance sites measuring long-term carbon and energy fluxes in contrasting ecosystems and climates. Energy balance closure was evaluated by statistical regression of turbulent energy fluxes (sensible and latent heat (LE)) against available energy (net radiation, le...
In captivity, some species often seem to thrive, while others are often prone to breeding problems, poor health, and repetitive stereotypic behaviour. Within carnivores, for instance, the brown bear, American mink and snow leopard typically adapt well to captivity and show few signs of poor welfare, while the clouded leopard and polar bear are generally hard to breed successfully and/or to prev...
Recently more evidence has been found that the dog could serve as a viable model for studying the evolutionary emergence and regulating mechanisms of human behaviour. This approach is of especial importance when someone wants to study the underlying mechanisms of such human behaviour disorders like attention deficit hyperactivity disorder (ADHD). Using questionnaires is a widely accepted method...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید