The causes of the deaths or culling of 155 adult pheasants in breeding pens on one site between 1995 and 1997 were investigated. Approximately half the deaths were the result of problems associated with the reproductive tract or trauma, including injuries acquired during fighting or mating. Sinusitis was the commonest infectious cause of mortality or culling, despite medication of the flocks fo...

Survival analysis in a Weibull proportional hazards model was used to evaluate the impact of somatic cell count (SCC) on the involuntary culling rate of US Holstein and Jersey cows with first calvings from 1990 to 2000. The full data set, consisting of records from 978,043 Holstein and 250,835 Jersey cows, was divided into subsets (5 for Holsteins and 3 for Jerseys) based on herd average lactat...

A study published in 1996 by the National Animal Health Monitoring System (NAHMS) indicated that 15% of cows culled from dairy herds in the United States were culled as a “direct effect” of lameness. This sounds reasonable until one considers that the “indirect effects” of lameness on production and reproduction are estimated to account for an additional 49.1% of culling in US herds. Although t...

Computer Aided Design (CAD) and architectural models typically contain hundreds of thousands to millions of 3D primitives. In order to display these models at interactive rates, the number of primitives to be rendered must be reduced. This paper presents an experimental system which combines multiple simplification algorithms into a single framework for the rapid display of massive geometric mo...

We present a novel culling algorithm that uses deforming non-collinear filters to improve the performance of continuous collision detection (CCD) algorithms. The underlying idea is to use simple and effective filters, deforming noncollinear filters (NCFs), that reduce the number of false positives between the primitives. These filters are derived from the collinear conditions and can be easily ...

We propose a new method for occlusion culling in the computation of a hologram based on the mutual conversion between light-rays and wavefront. Since the occlusion culling is performed with light-ray information, conventional rendering techniques such as ray-tracing or image-based rendering can be employed. On the other hand, the wavefront is derived for the calculation of light propagation, th...

In this work, we investigate an efficient approach to treat fragment racing when computing k-nearest fragments. Based on the observation that knowing the depth position of the k-th fragment we can optimally find the k-closest fragments, we introduce a novel fragment culling component by employing occupancy maps. Without any softwareredesign, the proposed scheme can easily be attached at any k-b...