Poultry or Avian Science Commons^™

Gene Expression Response To Heat Stress In Two Broiler Lines, Jibin Zhang, Carl J. Schmidt, Susan J. Lamont

Jibin Zhang

The fast growth rate and increased body weight of modern broilers makes them susceptible to heart failure and sensitive to heat stress. To find the genetic causes of these problems, gene expression was measured in hearts of two broiler lines that differed in their response to heat stress. Each line was separated into two groups that were kept under heat stress or at ambient temperature. The comparison of gene expression between the two lines and heat treatments suggests that expression of 325 genes were significantly changed in modern broilers under heat stress, while only 3 genes changed their expression in …

Variation In Avian Pathogenic Escherichia Coli Colonization Levels In Chickens, Melissa Monson, Michael Kaiser, Susan Lamont

Melissa Monson

Colonization levels in five tissues after avian pathogenic Escherichia coli (APEC) inoculation were investigated in chickens to generate phenotypic data for a genome wide association study (GWAS). Bacterial loads were measured in 370 birds and varied among individuals and tissues. Mean bacterial levels were significantly different between tissues (right lung > spleen > left lung and liver > blood). There were also significant correlations in bacterial load between tissues. These data suggest that colonization levels could be used as phenotypes in GWAS and could help identify markers associated with poultry resistance to APEC infections. After verification, these markers could be used for genetic …

Differential Expression Of Cell Cycle Regulators During Hyperplastic And Hypertrophic Growth Of Broiler Subcutaneous Adipose Tissue.Pdf, Jibin Zhang, Yeunsu Suh, Young Min Choi, Paula Chen, Michael Davis, Kichoon Lee

Jibin Zhang

The Human/Animal Interface: Emergence And Resurgence Of Zoonotic Infectious Diseases, Michael Greger

Michael Greger, MD, FACLM

Emerging infectious diseases, most of which are considered zoonotic in origin, continue to exact a significant toll on society. The origins of major human infectious diseases are reviewed and the factors underlying disease emergence explored. Anthropogenic changes, largely in land use and agriculture, are implicated in the apparent increased frequency of emergence and reemergence of zoonoses in recent decades. Special emphasis is placed on the pathogen with likely the greatest zoonotic potential, influenzavirus A.

New Model For Examining The Energy Metabolism Of Laying Hens, G. Murugesan, Michael Persia

G. R. Murugesan

An experiment was conducted to evaluate the energy utilization of laying hens fed diets containing two energy concentrations, using a holistic approach includingmeasurement of productive, maintenance and storage energy. The experiment was a 2 x 2 factorial arrangementwith two feeding levels (ad libitum and restricted feeding of 90 g feed/hen-d), and two dietary energy levels (HE-high metabolizable energy or ME content of 2,880 kcal/kg; and LE-low ME content of 2,790 kcal/kg). A total of 60 HyLine W36 first-cycle laying hens were fed treatment dietsfor 12 wk from hen age 27 to 39 wk, with 15 individually housed hens for each …

Evaluation Of Energy Values Of Various Oil Sources When Fed To Broiler Chicks, G. Murugesan, Brian Kerr, Michael Persia

G. R. Murugesan

The nitrogen-corrected apparent metabolizable energy (AMEn) values of seven different oil and fat sources used in broiler diets, primarily across the Midwestern US, were determined in a digestibility experiment. Fifteen days old, Ross 308 male broiler chicks were fed diets containing each oil or fat source at 0%, 3%, 6%, and 9% inclusion levels for 7 days before excreta samples were collected to analyze AMEn on day 21. The AMEn was calculated using 2 different methods, including a linear equation slope method as well as calculating the difference between basal diet and oil containing diets. The AMEn values determined by …