Publications by authors named "Morgan Pfeiffer"

The National Beef Quality Audit ()-2022 serves as a benchmark of the current market cow and bull sectors of the U.S. beef industry and allows comparison to previous audits as a method of monitoring industry progress.

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: Limited knowledge is currently available on the effects of modified atmospheric packaging (MAP) on the metabolite profiles of cooked beef. The objective was to evaluate the impact of packaging on the cooked color and cooked metabolite profile of normal-pH (normal bright-red color) and atypical-dark-cutting beef (inherently slightly dark-colored) muscle. : Normal-pH (pH 5.

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Thermal sensors mounted on drones (unoccupied aircraft systems) are popular and effective tools for monitoring cryptic animal species, although few studies have quantified sampling error of animal counts from thermal images. Using decoys is one effective strategy to quantify bias and count accuracy; however, plastic decoys do not mimic thermal signatures of representative species. Our objective was to produce heat signatures in animal decoys to realistically match thermal images of live animals obtained from a drone-based sensor.

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  • Reflectance-based oxygen consumption measurement relies on the conversion of oxymyoglobin to deoxymyoglobin in meat, but this process is influenced by the meat's age and display time, potentially leading to inaccurate results.* -
  • This study aimed to assess how measuring metmyoglobin during oxygen consumption affects the understanding of beef color stability, using two types of muscles: psoas major (less stable color) and longissimus (more stable color).* -
  • Results showed that metmyoglobin levels were higher on the oxygen-exposed surface compared to the interior, especially in the psoas major, suggesting that including metmyoglobin in oxygen consumption assessments can provide a clearer picture of meat color stability.*
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The National Beef Quality Audit - 2022 serves as a benchmark of the current fed steer and heifer population of the U.S. beef industry and allows comparison to previous audits as a method of monitoring industry progress.

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The National Beef Quality Audit (NBQA)-2022 serves as a benchmark of the current market cow and bull sectors of the U.S. beef industry and allows comparison to previous audits as a method of monitoring industry progress.

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The National Beef Quality Audit () has been conducted regularly since 1991 to assess and benchmark quality in the U.S. beef industry, with the most recent iteration conducted in 2022.

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Limited studies have determined the effects of modified atmospheric packaging (MAP) on atypical dark-cutting beef surface color. The objective was to compare the impacts of using vacuum packaging, carbon monoxide (CO-MAP), and HiOx-MAP (high‑oxygen) on the retail color of normal-pH and atypical dark-cutting beef aged 14 d. Atypical dark-cutting beef (pH 5.

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Meat discoloration starts at the interface between the bright red oxymyoglobin layer and the interior deoxymyoglobin layer. Currently, limited tools are available to characterize myoglobin forms formed within the sub-surface of meat. The objective was to demonstrate a needle-probe based single-fiber reflectance (SfR) spectroscopy approach for characterizing sub-surface myoglobin forms of beef psoas major muscles during retail storage.

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  • Drones are enhancing animal monitoring by using both visible and thermal images, which helps in detecting and classifying various species.
  • We tested eight different methods for fusing these image types alongside two deep learning models, specifically looking at white-tailed deer, cows, and horses.
  • While fusing images showed limited benefits for cows and horses, it significantly improved detection of deer, increasing accuracy from 15% to 85%, suggesting fusion is especially effective for cryptic animals.
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Meat discoloration starts from the interior and spreads to oxymyoglobin layer on the surface. The effects of oxygen exposure within a steak on the metabolome have not been evaluated. Therefore, the objective of this study was to evaluate the impact of oxygen exposure on the metabolome of the longissimus lumborum muscle.

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Background: Small unoccupied aircraft systems (UAS) are replacing or supplementing occupied aircraft and ground-based surveys in animal monitoring due to improved sensors, efficiency, costs, and logistical benefits. Numerous UAS and sensors are available and have been used in various methods. However, justification for selection or methods used are not typically offered in published literature.

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  • Conservation practitioners need to manage nuisance species, like turkey vultures, which can be hazardous to aircraft.
  • This study evaluated the effectiveness of different types of unmanned aircraft systems (UAS) in dispersing vultures by examining their responses to various UAS platforms and approaches.
  • Results showed that vultures reacted more quickly to fixed-wing UAS and perceived targeted approaches as riskier, but overall effectiveness varied, suggesting that the choice of UAS should depend on specific management goals related to dispersal.
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In recent years, small unmanned aircraft systems (sUAS) have been used widely to monitor animals because of their customizability, ease of operating, ability to access difficult to navigate places, and potential to minimize disturbance to animals. Automatic identification and classification of animals through images acquired using a sUAS may solve critical problems such as monitoring large areas with high vehicle traffic for animals to prevent collisions, such as animal-aircraft collisions on airports. In this research we demonstrate automated identification of four animal species using deep learning animal classification models trained on sUAS collected images.

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Background: Animal-vehicle collisions represent substantial sources of mortality for a variety of taxa and can pose hazards to property and human health. But there is comparatively little information available on escape responses by free-ranging animals to vehicle approach versus predators/humans.

Methods: We examined responses (alert distance and flight-initiation distance) of focal Canada geese () to vehicle approach (15.

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  • Collisions between birds and military aircraft are common and can lead to serious damage, highlighting the need for understanding wildlife hazards to estimate strike risks.
  • Research focused on 36,979 strike records involving U.S. Navy and Air Force aircraft to identify which bird species pose the greatest threats, finding that the snow goose is the most hazardous species.
  • Results indicate that larger bird species tend to be more dangerous to military aircraft, and hazard scores vary depending on the type of aircraft, suggesting that wildlife management plans should prioritize birds with high relative hazard scores.
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The frequency and severity of injection-site lesions in the outside round muscles of both beef and dairy cattle were evaluated through a series of audits. Audits were conducted in 2017 on 1,300 rounds from dairy and beef cows from seven locations throughout the United States. Outside round muscles were butterfly cut into 1.

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The objective of this research was to determine the effects of nitrite-embedded/FreshCase packaging on lean color of dark-cutting beef. Eight dark-cutting (pH > 6.0) and eight USDA Low Choice (normal-pH; mean pH = 5.

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To continue the series that began in 1994, the National Beef Quality Audit () - 2016 was conducted to quantify the quality status of the market cow and bull beef sector, as well as determine improvements made in the beef and dairy industry since 2007. The NBQA-2016 was conducted from March through December of 2016, and assessed hide-on carcasses ( = 5,278), chilled carcasses ( = 4,285), heads ( = 5,720), and offal items ( = 4,800) in 18 commercial processing facilities throughout the United States. Beef cattle were predominantly black-hided; 68.

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