NE1441: Environmental Impacts of Equine Operations

(Multistate Research Project)

Status: Active

SEAS-422 Reports


Westendorf, M. L., C. A. Williams, and L. B. Kenny. 2015. Case Study: Protection of environmental resources through the implementation of optimum feed-management practices on equine farms. Prof. Anim. Sci. 31:296-301.  (    

Westendorf, M. L. and C. A. Williams.  2015.  Effects of excess dietary phosphorus on fecal phosphorus excretion and water extractable phosphorus in horses. J. Equine Vet. Sci. 35:495-498.(


  1. L. Trottier, R. C. Bott, A. Woodward, E.A. Greene, C. A. Williams, M. L. Westendorf, A. M. Swinker, S.L. Mastellar, and K. M. Martinson. 2016.   Gastrointestinal Nitrogen Metabolism of Equids and Impact on Protein Requirement.  J. Equine Vet. Sci. 45:78-86. (

  2. C. Bott, A. Woodward, E.A. Greene, N. L. Trottier, C. A. Williams, M. L. Westendorf, A. M. Swinker, S. L. Mastellar, and K. M. Martinson.  2016.   Environmental Implications of Nitrogen Output on Horse Operations: A Review.  J. Equine Vet. Sci. 45:98-106. (


Journal Articles

Siciliano, P.D.,  Jennifer C. Gill, Morghan A. Bowman.  2017.  Effect of Sward Height on Pasture Nonstructural Carbohydrate Concentrations and Blood Glucose/Insulin Profiles in Grazing Horses, J. of Equine Vet. Sci. 57:29-34.

Martinson, K.L., P.D. Siciliano, C.C. Sheaffer, B.J. McIntosh, A.M. Swinker, C.A. Williams. 2017.  A Review of Equine Grazing Research Methodologies.  J. Equine Vet. Sci. 51:92-104.

Siciliano PD. Methods for Regulating Dry Matter Intake in Grazing Horses - eXtension 2017. (accessed July 14, 2017)

Weir, H. Li, L.K. Warren, E. Macon, C. Wickens. 2017. Characterizing ammonia emissions from horses fed different crude protein concentrations. J. Anim. Sci. 95(8):3598-3608. doi: 10.2527/jas.2017.1648.

Nazarenko, Y., M. L. Westendorf, C. A. Williams, and G. Mainelis.  2018. The Effects of Bedding Type used in Stalls and Activity of Equines on Stall Air Quality: Potential Consequences for Health and Performance of Equines. J. Equine Vet. Sci. (Accepted with minor corrections).

Kenny, L. B., D. Ward, M. Robson, C. A. Williams. 2018.  Technical note: Comparing four techniques for estimating desired grass species composition in horse pastures.  J. Anim. Sci. (in press).

Martinson, K. L., P. Siciliano, C. C. Sheaffer, B. McIntosh, A. M. Swinker and C. A. Williams.  2017.  A review of equine grazing research methodologies.  J. Equine Vet. Sci.  51:92-104. doi: 10.1016/j.jevs.2017.01.002



Williams, C. A. 2017. Nutrient cycling in horse pastures. Waste to Worth Conf. Proc. Raleigh, NC. Online:

Williams, C. A., L. B. Kenny, and A. O. Burk. 2017. Effects of grazing system and season on glucose and insulin dynamics of the grazing horse.  J. Equine Vet. Sci. 52:87. Abstract #108.

Weir, H. Li, L.K. Warren, E. Macon, C. Wickens. 2017. Evaluating the Impact of Ammonia Emissions from Equine Operations on the Environment. Waste to Worth: Spreading Science and Solutions. Cary, NC. April 18-21, 2017. Accessed on: February 3, 2018.

J.M. Weir, H. Li, L.K. Warren, E. Macon, C. Wickens. 2017. Manure nitrogen characteristics from horses fed warm season grass hays. J. Equine Vet. Sci. 52:84. doi:

J.M. Weir, H. Li, E. Rankins, C. Wickens. 2017. Ammonia emissions from equine facilities in the Mid-Atlantic region. J. Equine Vet. Sci. 52:102. doi:

J.M. Weir, H. Li, C. Zhang, D. Ferguson, S. Dougherty, C. Wickens. 2017. Determining the aversion of horses to different ammonia concentrations. J. Equine Vet Sci. 52:104. doi:

Wickens, M. Lusk, J. Hinton, J. Wallace, C. LaRiche, V.J. Harwood. 2017. Manure Management Practices and Educational Needs of Florida Small Scale Equine Operations. American Society of Agronomy, Crop Science Society of America, Soil Science Society of America International Annual Meeting, Managing Global Resources for a Secure Future. ASA Section: Environmental Quality, Tampa FL, October 22-25, 2017. Accessed on: February 3, 2018.


Research report



Low Cost Equine Manure Compost:

Manure composting for small livestock operation:

Reseeding pastures and hayfields:

Fojtik, A. and C. A. Williams. 2017. A Guide to More Productive and Nutrient Dense Horse Pastures. Rutgers Cooperative Extension. FS1271. New Brunswick, NJ. pp. 1-4. 


Popular press articles


Weinert, J. and C. A. Williams. 2017.  “Managing horse pastures over the winter”. In: New Jersey Farmer. October 1. p. 6 & 13.


Williams, C. A. 2017.  “Analyzing sugar content in pasture grasses”. In: New Jersey Farmer. September 1. p. 6 & 15.


Williams, C. A. 2017.  “Forage testing your horse pastures can be beneficial”. In: New Jersey Farmer. July 1. p. 6 & 8.


Williams, C. A. 2017.  “What to do about your horse’s ‘Drooling’ problem?”. In: New Jersey Farmer. May 1. p. 6 & 11.


Williams, C. A. 2017.  “Are Creeks Reliable, Safe Water Sources for Horses?”. In: New Jersey Farmer. April 1. p. 6 & 13.


Williams, C. A. 2017.  “Early Spring Toxic Plants in Horse Pastures”. In: New Jersey Farmer. February 1. p. 6 & 16.

Westendorf, M. L. Animal Science Update:  Animal waste budgeting input and output.  New Jersey Farmer. June 15, 2017.  Page 6.

Westendorf, M. L. Animal Science Update: Learn the basics of pasture management.  New Jersey Farmer. May 15, 2017.  Page 6.

Westendorf, M. L.  Animal Science Update: Climate change and ruminants..  New Jersey Farmer.  April 15, 2017.  Page 6.

Westendorf, M. L. Animal Science Update: Learn the basics of feed, forage testing.  New Jersey Farmer. February 15, 2017.  Page 6.

Westendorf, M. L. Animal Science Update: Water most abundant, least understood of nutrients.  New Jersey Farmer. December 15, 2016.  Page 6.



Log Out ?

Are you sure you want to log out?

Press No if you want to continue work. Press Yes to logout current user.

Report a Bug
Report a Bug

Describe your bug clearly, including the steps you used to create it.