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Subjects Pennsylvania Remove constraint Pennsylvania: Pennsylvania
Displaying items 1 - 10 of 327 start over

1. A longitudinal study on the impact of Johne's disease status on milk production in individual cows

Description:
Includes references
Author:
Smith, R.L. , Grohn, Y.T. , Pradhan, A.K. , Whitlock, R.H. , Van Kessel, J.S. , Smith, J.M. , Wolfgang, D.R. , Schukken, Y.H.
Subject:
longitudinal studies , paratuberculosis , milk yield , milk production , cattle diseases , dairy cows , disease incidence , Mycobacterium avium subsp. paratuberculosis , Dairy Herd Improvement Associations , New York , Vermont , Pennsylvania
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Year:
2009

2. A mathematical model of the dynamics of Salmonella Cerro infection in a US dairy herd

Description:
Includes references
Author:
Chapagain, P.P. , Van Kessel, J.S. , Karns, J.S. , Wolfgang, D.R. , Hovingh, E. , Nelen, K.A. , Schukken, Y.H. , Grohn, Y.T.
Subject:
dairy cattle , dairy herds , Salmonella , salmonellosis , disease outbreaks , infection , population dynamics , disease prevalence , host-pathogen relationships , disease surveillance , mathematical models , nonlinear models , epidemiology , United States , Pennsylvania
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Year:
2008

3. A New Species of Sarcocystis (Apicomplexa: Sarcocystidae) from the Black Bear (Ursus americanus) [Erratum: 2008 Aug., v. 94, no. 4, p. 933.]

Description:
Includes references
Author:
Dubey, J.P. , Humphreys, J.G. , Fritz, D.
Subject:
Sarcocystis , new species , taxonomy , sarcocysts , bradyzoites , ultrastructure , sarcocystosis , Ursus americanus , Pennsylvania
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Year:
2008

4. A study of two methods for associating farm operators with area segments

Description:
Title from title screen (viewed Dec. 29, 2010).
Author:
Pope, Larry. , United States Dept. of Agriculture. Statistical Reporting Service. Standards and Research Division. Research and Development Branch.
Subject:
Agricultural estimating and reporting , United States , estimation , farm operators , Florida , Ohio , Oregon , Pennsylvania
Year:
1971

5. A Survey of Honey Bee Colony Losses in the U.S., Fall 2007 to Spring 2008

Description:
Includes references
Author:
VanEngelsdorp, Dennis , Hayes, Jerry Jr. , Underwood, Robyn M. , Pettis, Jeffery
Subject:
Apis mellifera , honey bees , colony collapse disorder , bee diseases , disease surveillance , surveys , epidemiology , honey bee colonies , apiculture , winter , United States , Pennsylvania
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Year:
2008

6. A whole genome association analysis identifies loci associated with Mycobacterium avium subsp. paratuberculosis infection status in US holstein cattle

Author:
M. Settles , R. Zanella , S. D. McCay , R. Zanella , J. F. Taylor , R. Zanella , Y. Schukken , J. F. Taylor , J. F. Taylor , H. Neibergs
Subject:
Holstein , Mycobacterium avium subsp. paratuberculosis , animal tissues , cattle diseases , dairy cows , feces , genes , loci , longitudinal studies , paratuberculosis , single nucleotide polymorphism , New York , Pennsylvania , Vermont
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Year:
2009

7. Above- and belowground productivity and soil carbon dynamics of pasture mixtures

Description:
Includes references
Author:
Skinner, R.H. , Sanderson, M.A. , Tracy, B.F. , Dell, C.J.
Subject:
pastures , soil fertility , soil organic matter , root growth , dry matter accumulation , dry matter partitioning , forage , crop yield , crop-weed competition , species diversity , dairy cows , photosynthesis , nitrogen , botanical composition , water stress , rooting , Pennsylvania
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Year:
2006

8. Accuracy and Performance of Three Water Quality Models for Simulating Nitrate Nitrogen Losses under Corn

Description:
Includes references
Author:
Jabro, J.D. , Jabro, A.D. , Fox, R.H.
Subject:
nitrate nitrogen , simulation models , hydrologic models , soil analysis , leaching , LEACHM model , water quality , prediction , accuracy , nitrates , model validation , groundwater , groundwater contamination , silt loam soils , equations , Zea mays , soil nutrient dynamics , Pennsylvania
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Year:
2006

9. Alternative Methods of Estimating Forage Height and Sward Capacitance in Pastures Can Be Cross Calibrated

Description:
Includes references
Author:
Rayburn, E.B. , Lozier, J.D. , Sanderson, M.A. , Smith, B.D. , Shockey, W.L. , Seymore, D.A. , Fultz, S.W.
Subject:
meters (equipment) , pastures , pasture management , sampling , measuring devices , sward , stand characteristics , grazing management , West Virginia , Pennsylvania , Maryland , Virginia
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Year:
2007

10. Ammonia Emissions from Twelve U.S. Broiler Chicken Houses

Description:
Includes references
Author:
Wheeler, E.F. , Casey, K.D. , Gates, R.S. , Xin, H. , Zajaczkowski, J.L. , Topper, P.A. , Liang, Y. , Pescatore, A.J.
Subject:
poultry housing , gas emissions , ammonia , poultry manure , seasonal variation , ventilation systems , Kentucky , Pennsylvania
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Year:
2006