Hongwei Xin

Iowa State University, Agricultural and Biosystems Engineering, Faculty Member

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Dr. Xin is a Charles F. Curtiss Distinguished Professor in the Departments of Agricultural and Biosystems Engineering (ABE) and Animal Science at Iowa State University, Iowa Egg Council endowed professor, and director of the Egg Industry Center located at Iowa State University. His research and extension programs focus on a) air quality issues relative to animal production; b) animal-environment interactions with regards to animal bioenergetics, behavior and welfare, production efficiency and sustainability; and c) livestock and poultry housing systems and environmental control. As director of the Egg Industry Center, he oversees the operation of the Center whose mission is to add value to the egg industry by facilitating research and learning for egg producers, processors and consumers through national and international collaborations.

Professor Xin’s scholarly accomplishments include author/co-author of 165 published refereed journal articles (over 600 technical publications and presentations total); PI/Co-PI of $23 million in contracts and grants; mentor of 62 graduate students, post-docs and visiting scholars; delivery of over 100 invited talks in 15 countries. He serves on numerous academic, industry and government scientific advisory boards or task forces at state, national and international levels.
Supervisors: James A. DeShazer (MS, PhD)

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OPTIMIZATION OF PARTIAL SURFACE WETTING TO COOL CAGED LAYING HENS

by Richard Gates and Hongwei Xin

Partial surface wetting to cool caged laying hens (Hy–Line W–98 breed, 34 µ1 wk) was investigated... more Partial surface wetting to cool caged laying hens (Hy–Line W–98 breed, 34 µ1 wk) was investigated for a range of acute heat challenge conditions. The cooling water required to prevent surface and core body temperatures of the hen from escalating was expressed in terms of water spray interval (SI 10 , min) at a constant spray dosage (10 mL hen –1) and evaporation rate (ER, mL min –1) of the sprayed water. The thermal conditions used in this study consisted of air velocity (V) of 0.2 to 1.2 m s –1 in combination with air vapor pressure deficit (VPD air) of 2.1 to 5.3 kPa that corresponds to dry–bulb temperature (t db) of 35³C to 41³C and dew–point temperature (t dp) of 21³C to 27³C. ER was directly proportional to VPD air · V. The empirical relationships provide a basis for optimizing operation of partial surface wetting systems to relieve caged layers of heat stress in commercial production settings. dult laying hens have a thermoneutral zone (TNZ) of 21³C to 25³C. Deviation of the thermal environment from TNZ leads to performance reduction or mortality under severe conditions. A number of studies have shown the adverse effects of elevated environmental temperature on laying hen performance

Hongwei Xin

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