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Darrin M. Karcher
Purdue University
EndocrinologyAnimal scienceLitterVeterinary medicineBiology
67Publications
14H-index
732Citations
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Publications 67
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#1S.L. Weimer (UMD: University of Maryland, College Park)H-Index: 1
#2Andy Mauromoustakos (UA: University of Arkansas)H-Index: 23
Last. Marisa A. Erasmus (Purdue University)H-Index: 3
view all 4 authors...
Abstract Consumer concern for broiler welfare has increased interest in chicken from slower growing (SG) broiler strains. Broilers from SG strains take longer to reach market weight, which may necessitate differences in management practices, such as stocking density. This study evaluated the effects of 2 stocking densities on production performance, body conformation, and welfare of broilers from 2 strains. Broilers from strains that reach market weight at 42 days old (CONV; N = 284) and at 63 d...
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#1Deana R. Jones (Purdue University)
#1Deana R. Jones (ARS: Agricultural Research Service)H-Index: 22
Last. Darrin M. Karcher (Purdue University)H-Index: 14
view all 6 authors...
Environmental testing for Salmonella Enteritidis is required for U.S. shell egg producers with > 3,000 hens on a farm. The egg producer assumes all costs for the mandatory testing. According to the FDA Egg Rule, either manure scraper or drag swabs can be collected according to published guidelines and requirements. The current study was undertaken to determine the efficacy of Salmonella detection in single, two, and four swab pools of either manure scraper or drag swabs. Resistant isolates of Sa...
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#1Sydney L. Baker (UC Davis: University of California, Davis)H-Index: 2
#2C.I. Robison (MSU: Michigan State University)H-Index: 5
Last. M. M. Makagon (UC Davis: University of California, Davis)H-Index: 10
view all 5 authors...
ABSTRACT Factors contributing to the development of keel bone damage are not well understood. This study aimed to identify behaviors and cage structures associated with acceleration events experienced by individual hens at their keels as the birds navigated their enriched colony cage environments. Additionally, we aimed to characterize the accelerations associated with these behaviors, as we postulated that behaviors associated with higher accelerations may be more likely to lead to keel bone da...
1 CitationsSource
#1M. S. Lilburn (Ohio Agricultural Research and Development Center)H-Index: 1
Last. Darrin M. Karcher (Purdue University)H-Index: 14
view all 4 authors...
SUMMARY Growing pullets and subsequently laying hens were fed practical type corn-soybean meal diets with and without 0.1% supplemental magnesium oxide (MgO) through 36 wk of age. During the pullet phase, one half the chicks were allowed access to perches beginning at a day of age (2.5 cm) and perch height was increased in 2.5 cm weekly increments through 3 wk. Access to perches had no effect on body weight or skeletal development, and there were no significant perch x MgO interactions. There wa...
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#1Mary G. Erickson (Purdue University)
#2Marisa A. Erasmus (Purdue University)H-Index: 3
Last. Elizabeth L. Karcher (Purdue University)
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ABSTRACT Public knowledge of the poultry industry is limited, yet attitudes towards the industry shape consumer behavior and influence the attractiveness of poultry careers and future study. This study assessed an online learning program contextualizing STEM learning within poultry science which was designed to increase poultry knowledge and interest. High school student participants (n = 169) across 16 classes (n = 12 teachers) in Indiana completed seven 30-min online modules during the fall 20...
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#1S.L. Weimer (UMD: University of Maryland, College Park)H-Index: 1
#2C.I. Robison (MSU: Michigan State University)H-Index: 5
Last. Darrin M. Karcher (Purdue University)H-Index: 14
view all 5 authors...
: Many laying hen companies in the United States are pledging to move away from intensive conventional cages to extensive housing systems. Enriched colony cages (ECC) are a practical alternative to conventional cage systems. Scientific research is limited on the effects of ECC on hen production and welfare. Therefore, the objective of this study was to evaluate the effects of stocking density on welfare and performance with the overall outcome to provide guidance on stocking density for ECC. At ...
1 CitationsSource
#1C.I. Robison (MSU: Michigan State University)H-Index: 5
#2Darrin M. Karcher (Purdue University)H-Index: 14
ABSTRACT Laying hen skeletal health continues to be an industry priority. Bone ash and bone Ca quantification in laying hen long bones provides valuable information on skeletal health. Unfortunately, these measurements can only be accomplished by sacrificing hens, thus making longitudinal measurements on the same hen impossible. Quantitative computed tomography (QCT), used with a calcium hydroxyapatite phantom, has been used to determine bone density of wings and legs as well as live hens throug...
2 CitationsSource
#1Darrin M. Karcher (Purdue University)H-Index: 14
#2Deana R. Jones (USDA: United States Department of Agriculture)H-Index: 22
Last. Kenneth E. Anderson (NCSU: North Carolina State University)H-Index: 26
view all 6 authors...
SUMMARY Disease outbreaks can dramatically impact a producer's production schedule by disrupting the pullet movement into the hen house. One alternative is to early molt laying hens as they are coming into production. Early molted birds had lower production compared to controls with no differences in egg weight or egg components percentages. Bird welfare impacts were minimal as a result of the early molt. This management practice could be employed to allow pullets to be held minimizing productio...
2 CitationsSource
#1Krista N. Eberle-Krish (NCSU: North Carolina State University)
#2Deana R. Jones (USDA: United States Department of Agriculture)H-Index: 22
Last. Darrin M. Karcher (Purdue University)H-Index: 14
view all 6 authors...
SUMMARY The depopulation of healthy birds during a disease outbreak can impact recovery and further disrupt the food supply. In 2015, the United States faced one of the largest outbreaks of highly pathogenic avian influenza ever confirmed. Many of the 7 million pullets depopulated were healthy but could not be moved to laying facilities because of their location in quarantine zones. The objective of this study was to assess the impact of an early production induced molt on Salmonella and Campylo...
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#1Ahmed B.A. Ali (MSU: Michigan State University)H-Index: 6
#2Dana L.M. Campbell (MSU: Michigan State University)H-Index: 15
Last. Janice M. Siegford (MSU: Michigan State University)H-Index: 18
view all 4 authors...
ABSTRACT Multi-tiered aviaries for laying hens are designed to provide resources, such as perches, that allow birds to perform natural behaviors, thus improving their welfare. This research examined nighttime roosting heights and substrates used by laying hens of 4 genetic strains (Dekalb White: W1, Hy-Line W36: W2, Hy-Line Brown: B1, Bovans Brown: B2), in multitier aviaries (144 hens/unit, 4 units/strain) at 25 to 28 wk of age (peak lay). Influence of litter provision on roosting patterns of th...
5 CitationsSource
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