Anne M Parkhurst

Anne M Parkhurst
University of Nebraska at Lincoln | NU · Department of Statistics

About

110
Publications
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2,715
Citations
Citations since 2017
0 Research Items
845 Citations
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140

Publications

Publications (110)
Article
Full-text available
Background Over two decades of observations in the field in South East Asia and Hawai‘i suggest that majority of the commercial dairy herds are of black hair coat. Hence a simple study to determine the accuracy of the observation was conducted with two large dairy herds in Hawaii in the mid-1990s. MethodsA retrospective study on longevity of Holste...
Article
When biological systems undergo hysteretic behavior of stress and recovery due to global warming or other changes in environment and resources, modeling hysteresis becomes increasingly important. A system displays hysteresis if the output depends on past history of changes in the input. Moreover, the trajectory of rate-dependent hysteresis may be v...
Article
Full-text available
There has been increasing interest to measure core-body temperature in cattle using internal probes. This study examined the placement of HOBO water temperature probe with an anchor, referred to as the "sensor pack" (Hillman et al. Appl Eng Agric ASAE 25(2):291-296, 2009) in the vagina of multiparous Holstein cows under grazing conditions. Two type...
Article
Full-text available
This article compares results of using dynamic triangular forced-choice olfactometry (DTFCO), the Mask Scentometer, the Nasal Ranger, and an odor intensity reference scale (OIRS) to assess odors in a controlled-environment chamber in the Iowa State University Air Dispersion Laboratory. The methods were used to assess 13 odor levels in the chamber....
Article
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A summer study and a winter study were conducted using an incomplete factorial structure in a complete randomized design. Within season, the factors studied were 1) type of diet, which included 2 levels of ME, classified as either concentrate (3.04 Mcal of ME/kg) or roughage (2.63 Mcal of ME/kg) diets, and 2) daily ME intakes (MEI) of 11, 18, and 2...
Article
Thermal hysteresis may be used to quantify and characterize the amount of heat stress an animal experiences. Heat stress studies of farm animals suggest that above a certain threshold body temperature (Tb) is driven by ambient temperature (Ta). Patterns in the Tb-Ta phase diagram indicate the presence of hysteresis. When hysteresis is present, ther...
Conference Paper
This paper summarizes the development and operation of a Mask Scentometer and reports air dilution ratios measured during its use, which were used to establish the device’s dilution-to-threshold settings. The Mask Scentometer is a facial respirator that has been modified to operate conceptually like the Barneby and Sutcliffe Box Scentometer. The Ma...
Article
Malolactic fermentation (MLF), the conversion of malate to lactate, is an important process leading to the deacidification of hard apple cider. MLF is dependent on the levels of inhibitory factors such as sulfur dioxide and ethanol. To assess the effect of these 2 factors on MLF, hard apple cider was produced from pasteurized, unfiltered apple cide...
Article
A random sample of 323 Midwestern farm couples responded to a questionnaire designed to measure various aspects of family functioning, including lifestyle satisfaction and dyadic adjustment as well as perceptions of stress and coping strategies utilized. Although 96 percent of the women identified themselves as farmers, 38 percent were employed off...
Article
Feelings of loneliness and isolation occur at various stages of life but are usually most intense during adolescence. Studies have shown that adolescent females experience loneliness to a greater degree than males do. This study was based on the hypothesis that low-income, single, adolescent mothers would report a greater degree of loneliness than...
Article
Data, collected from a random sample of Nebraska residents and identified solar homeowners, were analyzed using discriminant analyses to identify attributes and dimensions of attributes of solar heating systems that differentiate among stages in the innovation-decision process. The findings indicate that different attributes and dimensions of attri...
Article
The objective of this study was to investigate the effects of conventionalization on marital ad justment research and other highly ego-involved studies relying upon self-report data. Convention alization is defined as the tendency of human subjects to distort self-appraisal data in the direction of social desirability. Relationships between marital...
Article
A measure to differentiate time managers was developed in which performance indi cators were used to derive a self-perception measure (TM Score). It was based upon planning for the future, meeting deadlines, and accuracy in estimating duration of routine tasks. Statistical tests used to investigate time management effectiveness were analysis of var...
Article
Full-text available
During the summer, a challenging thermal environment is known to cause a significant reduction in food intake, growth, milk production, reproduction and even death in cattle. In this study, we attempt to characterize the relationship of cattle body temperature with several environmental variables, such as air temperature, soil surface temperature,...
Article
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Serotonin (5-HT), a neurotransmitter synthesized from tryptophan, has been proposed as a feedback inhibitor of lactation. We determined that the gene coding for tryptophan hydroxylase 1, the rate-limiting enzyme for 5-HT synthesis, is expressed in bovine mammary epithelial cells in vitro and is upregulated by prolactin. In addition, 5-HT reduced th...
Article
The functional prebiotic stability of fructooligosaccharides (FOS) and inulin was determined using a prebiotic activity assay. Prebiotic activity scores were determined based on the change in cell biomass of Lactobacillus paracasei 1195 on the prebiotic relative to that of Escherichia coli under equivalent conditions. Prebiotics were dissolved in c...
Article
Two groups of 108 Angus cross yearling heifers were utilised to determine the effects of growth-promoting agents on behaviour, when utilised under thermoneutral, hot and cold environmental conditions. Pens of heifers were observed throughout the day for feed intake pattern via bunk score, panting (hot), degree of bunching and shivering (cold). For...
Article
Oyster mushrooms, Pleurotus sajor-caju, were grown on chopped corn stover substrate with increasing amounts of cracked corn supplementation and were harvested at immature and mature stages of growth. Descriptive terms for mushroom color, texture, and flavor were generated and used to determine the impact of cracked corn supplementation on the senso...
Article
Green and white asparagus were subjected to descriptive analysis, and resultant descriptors tested for effectiveness in describing and distinguishing between the two asparagus types. The effect (s) of 5 harvest times and 14 days of refrigerated storage on descriptor perception was investigated. Eleven descriptors, that described aroma (sweet potato...
Article
Nitrogen* sulfur fertilizer combinations and growing season effects on sensory quality/acceptability and color of hydroponically grown greenhouse lettuce cultivar, “Grand Rapids”, were studied. Lettuce samples were evaluated using an attribute rating scale for appearance, color, texture, flavor, bitterness and overall acceptability; actual leaf col...
Article
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This work extends our previous observation that the fungus Candida albicans secretes micromolar levels of farnesol and that accumulation of farnesol in vitro prevents the yeast-to-mycelium conversion in a quorum-sensing manner. What does farnesol do in vivo? The purpose of this study was to determine the role of farnesol during infection with a wel...
Article
The effects of induction boiling, conventional boiling and microwave steaming on the sensory qualities and carotenoid retention of broccoli, carrots, green beans and sweet potatoes were investigated. Significantly higher cooking yields were obtained for vegetables that were induction and conventionally boiled. No differences in the retentions of al...
Article
Adding 0, 8, 16 and 24% soy isolate to a cooked, refrigerated beef system decreased TBA values proportionately. The impact of specific crude soy protein fractions on development of rancidity (TBA values) was investigated. The 7S, 9S and 11S protein fractions, a whole protein isolate produced from the same flakes, and the same commercial soy isolate...
Article
Soil properties impact pesticide persistence. Because these characteristics operate together in situ, identification of their clustered associations can help explain pesticide fate. Factor analysis was used to reduce the dimensionality of soil characteristics by grouping them into clustered independent factors, which were then related to the minera...
Article
Full-text available
To investigate the relative pathogenicity of Candida albicans treated with subinhibitory concentrations of fluconazole in a mouse model of disseminated candidiasis. Previous studies indicate that these cells secrete 10 times more farnesol than do untreated cells. In our usage, subinhibitory means a concentration which causes a prominent decrease in...
Article
A laboratory nixtamalization process was developed to imitate larger scale cooking/steeping conditions. Corn (45 kg) was cooked in a pilot plant gas-fired cook/steep tank and temperature was monitored every 30 sec. Cooling and heating rates were mimicked in the laboratory using a digital temperature programmable hot plate that adjusted grain-water-...
Article
This book is about understanding and applying multivariate statistical methods useful for analyzing complex ecological problems. Researchers and students seeking to improve their ability to collect and analyze data from field observations and experiments, especially those interested in the response or variation of biotic communities to environmenta...
Article
Full-text available
Heat stress in feedlot cattle causes reduced performance, and in the most severe cases, death of the animals, thus causing the loss of millions of dollars in revenue to the cattle industry. A study was designed to evaluate dynamics of thermoregulation and feeding activities when feeder cattle were exposed to simulated heat waves, in comparison with...
Article
Full-text available
An exchange regarding the article: Bradley, K. L., E. I. Damschen, L. M. Young, D. Kuefler, S. Went, G. Wray, N. M. Haddad, J. M. H. Knops, and S. M. Louda. 2003. Spatial heterogeneity, not visitation bias, dominates variation in herbivory. Ecology 84:2214–2221. Cahill et al. write: Here we show that the experimental design and statistical analysis...
Article
A small-scale (35 g flour) laboratory method for Asian salted noodle processing was developed. Six wheat varieties were selected to compare laboratory and pilot plant production methods and resultant noodle products. Raw noodle color and discoloration after 24-h storage, cooking loss, and noodle weight gain during cooking were measured. Cooked nood...
Article
Full-text available
Net portal absorption of AA during the 6-h postprandial period was measured in eight gilts (48.5 ± 1.6 kg BW) in a crossover design. The pigs had chronic catheters placed in the portal vein, carotid artery, and ileal vein, and were trained to consume 1.2 kg of a standard grower diet once daily. Blood samples were taken every 30 min for 4 h and then...
Article
Net portal absorption of AA during the 6-h postprandial period was measured in eight gilts (48.5 +/- 1.6 kg BW) in a crossover design. The pigs had chronic catheters placed in the portal vein, carotid artery, and ileal vein, and were trained to consume 1.2 kg of a standard grower diet once daily. Blood samples were taken every 30 min for 4 h and th...
Article
Full-text available
The objective was to describe variability in prevalence, incidence, and duration of fecal shedding of naturally occurring E. coli O157:H7 by a group of feedlot cattle over time. One hundred steers, randomly assigned to 10 pens, were fed a high-concentrate finishing diet for 136 days (19 weeks). Rectal feces from each animal were tested for E. coli...
Article
Full-text available
Cereal Chem. 80(4):427–436 Amylose content is closely related to wheat flour pasting or thermal properties, and thus affects final food qualities. Fourteen flour blends with amylose content ranges of <1 to 29% were used to study tortilla production and quality parameters. Reduced amylose contents decreased dough stickiness and pliability; low amylo...
Article
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Cereal Chem. 80(4):437-445 Fourteen flour blends of two natural wild-type wheat (Triticum aestivum L.) flours, 'Nuplains' and 'Centura', blended with one waxy flour sample were characterized and processed to Asian salted noodles. The flour amylose content range was 1-29%. Damaged starch contents were 10.4, 7.0, and 6.6% for the waxy wheat, Nuplains...
Article
Odors are a major result of inadequately sized and mismanaged anaerobic lagoons. However, purple or pink colored lagoons, indicating the presence of phototrophic purple bacteria, are less likely to be an odor nuisance than are non-purple lagoons. Eight swine lagoons were studied to quantify critical parameters thought to allow purple lagoons to be...
Article
Three experiments were conducted to evaluate the effect of different management strategies on body temperature of feedlot steers finished in the summer months. In Exp. 1, 24 crossbred steers were chosen to assess the effect of altered feed intake and feeding time on tympanic temperature (TT) response. Managed feeding (MF) treatments were applied fo...
Article
Full-text available
Four feeding regimens were evaluated in two different outside facilities [tree windbreak provided (SP) vs no wind protection provided (NP)] over two winter seasons. Feeding regimens were 1) 7.5% (DM basis) alfalfa hay (AH) diet (Low- Low); 2) 15% (DM basis) AH diet switched to a 7.5% (DM basis) AH diet under cold stress conditions (High-Low); 3) 7....
Conference Paper
Full-text available
The effects of hair coat color on the thermoregulatory responses of heat-stressed cows exposed to direct solar radiation were observed. During August 2000, three white and three black lactating Holstein cows in Hawaii were exposed to 1.5 hr of sunlight for four trials in the morning and four trials in the afternoon with or without spray cooling. So...
Article
Fatty acid methyl esters (FAMEs) were used to ‘fingerprint’ soil microbial communities that evolved during 25 years of wheat-fallow cropping following native mixed prairie sod at Sidney, Nebraska, USA. Total ester-linked FAMEs (EL-FAMEs) and phospholipid-linked FAMEs (PL-FAMEs) were compared for their ability to discriminate between plots remaining...
Article
Full-text available
Odor emissions from anaerobic lagoons containing large populations of phototrophic bacteria are usually minimal. This study was conducted to determine whether copper (123 ppm) and zinc (2,310 ppm) in diets fed to weanling pigs for therapeutic purposes affect phototrophic conditions within lagoons. Column reactors containing 47 L of swine lagoon slu...
Article
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Nitrate-nitrogen leached from the root zone of land in intensive corn production is a major groundwater contaminant in some of the intensively irrigated regions of the western Cornbelt, including central and western Nebraska. To obtain a clearer understanding of the amount and timing of nitrate leaching losses from irrigated crops, 14 monolithic pe...
Article
An existing environmental chamber for short-term indirect calorimetric studies was re-configured for use as a within-chamber recirculation unit with a computerized control and data acquisition system, and modified with an in-chamber humidity control unit to provide 30 to 80% RH. Intake air was pre-conditioned to a specific temperature-humidity stat...
Article
Relationships of grain sorghum quality factors (proximate composition and physical properties) to laboratory wet-milling attributes (fraction yields, protein content of fractions and recovery values) of 24 grain sorghum commercial hybrids were determined. Initial water absorption rate was positively correlated with both starch and gluten recoveries...
Article
Correlations among grain sorghum quality factors (proximate composition, physical properties, and water absorption properties) were evaluated Samples of 46 commercial hybrids (24 and 22 from crop years 1993 and 1994 were analyzed for starch, protein, crude free fat, test weight absolute density, 1,000 kernel weight, percent kernel abraded, water ab...
Article
Full-text available
Influence of sulfur dioxide (SO2) and lactic acid (LA) on grain sorghum steeping efficiency in terms of wet-milling characteristics was investigated using response surface analysis. Tested ranges of concentrations in steeping water were 0.050 to 0.278% and 0 to 0.282% for SO2 and LA, respectively. Measured wet-milling variables were steeping solids...
Article
Surface topography, plant canopy, plant root distribution, and soil preferential flow paths cause variability in downward movement of agrichemicals in soil. To better understand this variability, tracers are often applied to the soil surface and their signatures (concentration patterns) are examined. To characterize Br- signatures within a Crete si...
Article
1.1. Using a 3-factor uniform-precision rotatable central composite design, male turkeys at 5 ages (5–20 weeks) subjected to 5 temperatures (T, 25–40°C) and 5 relative humidities (RH, 40–80%) during 2 h exposure periods were assessed for body temperature (BT), moisture production (MPM), CO2 production, respiration rate (RR) and heart rate (HR). Pre...
Book
Concentrations of alachlor, its ethanesulfonic acid degradate, atrazine and its degradates, deethylatrazine and deisopropylatrazine, in the upper regolith and associated shallow aquifers were determined in relation to landscape position (floodplains, terraces, and uplands) and irrigation (nonirrigated and irrigated corn cropland) in 1992. Irrigated...
Article
Temperature-humidity effects on physiological responses of tom turkeys were investigated using a two-dimensional rotatable central composite design. Eight temperature-humidity combinations were evaluated from 23 to 40°C and 40 to 90% RH. Response surfaces for mean, variation, and slope of core body temperature, CO2 production, and moisture producti...
Article
Chemigation has become an accepted chemical application method, but insufficient data document that actual chemical injection rates fall within acceptable limits of the manufacturer's rated capacity. Piston, diaphragm, and venturi type injection devices were tested to establish their linearity, repeatability, and steady-state accuracy for a series...