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Deirdre Hennessy

Research Officer - Grassland

Research Interests

  • Incorporating white clover in to pasture-based milk production systems
  • Nitrogen fertiliser in grazed grassland and nitrogen use efficiency
  • Grassland and grazing management
  • Grass physiology
  • Grass growth
  • Grass growth modelling
  • Grass based milk production systems 

Current Projects

  • Profiling milk from grass
  • Establish and manage clover
  • Pasture-Milk

Education

  • Ph.D. in Agricultural Science, The Queens University, Belfast 
  • Bachelor of Agriculture Science, University College Dublin

Career

  • Research Officer, Teagasc, AGRIC, Moorepark, Fermoy, Co. Cork - March 2008 to present
  • Funded Investigator, SFI VistaMilk Centre – 2018 to present
  • Post Doctorial Researcher, Teagasc Moorepark Dairy Production Research Centre, Fermoy, Co. Cork - July 2005 to Feb. 2008
  • Teagasc Walsh Fellow – Sept. 2001 to April 2005 
  • Senior Editor of Irish Journal of Agricultural and Food Research – 2018 to present
  • Section Editor of Irish Journal of Agricultural and Food Research – 2015 to 2018
  • President of Irish Grassland Association – 2012-2013  
  • Irish Grassland Association Council Member – 2007 to 2015
  • Magan, J.B., O’Callaghan, T.F., Zheng, J., Zhang, L., Mandal, R., Hennessy, D., Fenelon, M.A, Wishart, D.S., Kelly, A.L. and McCarthy, N.A. (2020) Effect of Diet on the Vitamin B Profile of Bovine Milk-Based Protein Ingredients. Foods 2020, 9(5), 578; https://doi.org/10.3390/foods9050578
  • Hennessy, D., Delaby, L., van den Pol-van Dasselaar, A. and Shalloo, L. (2020) Increasing Grazing in Dairy Cow Milk Production Systems in Europe. Sustainability, 12: 2443. https://doi.org/10.3390/su12062443.
  • van den Pol-van Dasselaar, A., Hennessy, D. and Isselstein, J. (2020) Grazing of Dairy Cows in Europe — An In-Depth Analysis Based on the Perception of Grassland Experts. Sustainability, 12: 1098. https://doi.org/10.3390/su12031098.
  • Hoekstra, N., Schulte, R.P.O., Forrestal, P.J., Hennessy, D., Krol, D.J., Lanigan, G.L., Muller, C., Shalloo, L., Wall, D.P. and Richards, K.G. (2020) Scenarios to limit environmental nitrogen losses from dairy expansion. Science of the Total Environment, 707: 134606
  • Guy, C., Hennessy, D., Gilliland, T.J., Coughlan, F., McClearn, B., Dineen, M. and McCarthy, B. (2020) White clover incorporation at high nitrogen application levels: results from a 3-year study. Animal Production Science, 60: 187 – 191.
  • Magan, J.B., O’Callaghan, T.F., Zheng, J., Zhang, L., Mandal, R. Hennessy, D., Fenelon, M.A., Wishart, D., Kelly, A.L. and McCarthy, N. (2019)  Impact of Bovine Diet on Metabolomic Profile of Skim Milk and Whey Protein Ingredients. Metabolites 9: 305; doi:10.3390/metabo9120305
  • Magan, J.B., Tobin,  J.T., O’Callaghan, T.F., Kelly, A.L., Fenelon, M.A., Hennessy, D. and McCarthy, N.A. (2019) Physicochemical properties of whole milk powder derived from cows fed pasture or total mixed ration diets. Journal of Dairy Science, 102: 9611–9621.
  • Gulati, A., Hennessy, D., O'Donovan, M., McManus, J.J., Fenelon, M.A. and Guinee, T.P. (2019) Dairy cow feeding system alters the characteristics of low-heat skim milk powder and processability of reconstituted skim milk. Journal of Dairy Science, 102: 8630-8647.
  • Alothman, M., Hogan, S.A., Hennessy, D., Dillon, P., Kilcawley, K.N., O’Donovan, M., Tobin, J., Fenelon, M.A. and O’Callaghan, T.F. (2019) The “Grass-Fed” Milk Story: Understanding the Impact of Pasture Feeding on the Composition and Quality of Bovine Milk. Foods, 8: 350; doi: 10.3390/foods8080350.
  • Panthi, R.R., Sundekilde, U.K., Kelly, A.L., Hennessy, D., Kilcawley, K.N., Mannion, D.T., Fenelon, M.A. and Sheehan, J.J. (2019) Influence of herd diet on the metabolome of Maasdam cheeses. Food Research International, 123: 722-731.
  • McDonnell, J., Brophy, C., Ruelle, E., Shalloo, L., Lambkin, K. and Hennessy, D. (2019) Weather forecasts to enhance an Irish grass growth model. European Journal of Agronomy, 105: 168-175.
  • Panthi, R.R., Kelly, A.L., Hennessy, D., O’Sullivan, M.G. Kilcawley, K.N., Mannion, D.T., Fenelon, M.A. and Sheehan, J.J. (2019) Effect of pasture versus indoor feeding regimes on the yield, composition, ripening and sensory characteristics of Maasdam cheese. International  Journal of  Dairy Technology, 72: 435-446. doi:10.1111/1471-0307.12590
  • Ruelle E., Delaby, L. and Hennessy, D. (2019) Le modèle ‘Moorepark - Saint-Gilles Grass Growth’ (MoSt GG) de prévision de croissance de l’herbe en conditions de pâturage. Fourrages, 236: 255-262.
  • Boiani, M., Sundekilde, U., Bateman, L.M., McCarthy, D.G., Maguire, A.R., Gulati, A., Guinee, T.P., Fenelon, M., Hennessy, D., FitzGerald, R.J., Kelly, P.M. (2019) Integration of high and low field 1H NMR to analyse the effects of bovine dietary regime on milk metabolomics and protein bound moisture characterisation of the resulting mozzarella cheeses during ripening, International Dairy Journal,91: 155-164.
  • Guy, C., Hennessy, D., Gilliland, T. J., Coughlan, F., McClearn, B., Dineen, M. and McCarthy, B. (2018) Comparison of perennial ryegrass, Lolium perenne L., ploidy and white clover, Trifolium repens L., inclusion for herbage production, utilisation and nutritive value. Grass and Forage Science, 73: 865–877.
  • Gulati, A., Galvin, N., Hennessy, D., McAuliffe, S., O’Donovan, M. McManus, J.J.,  Fenelon, M.A. and Guinee, T.P. (2018) Grazing of dairy cows on pasture versus indoor feeding on total mixed ration: Effects on low-moisture part-skim Mozzarella cheese yield and quality characteristics in mid and late lactation. Journal of Dairy Science, 101: 8737–8756.
  • Ruelle, E., Delaby, L. and Hennessy, D. (2018) Development of the Moorepark St Gilles grass growth model (MoSt GG model): A predictive model for grass growth for pasture based systems. European Journal of Agronomy, 99: 81-90.
  • Enriquez-Hidalgo, D., Gilliland, T.J., Egan, M. and Hennessy, D. (2018) Production and quality benefits of white clover inclusion into ryegrass swards at different nitrogen fertilizer rates. Journal of Agricultural Science, 156: 378–386.
  • Panthi, R.R., Kelly, A.L., Hennessy, D., McAuliffe, S., Mateo, M., O'Donnell, C., O'Callaghan, D.J. and Sheehan, J.J. (2018)  Kinetics of moisture loss during stirring of cheese curds produced from standardised milks of cows on pasture or indoor feeding systems. International Journal of Dairy Technology, 71: 663 – 672.
  • McDonnell, J., Lambkin, K., Fealy, R., Hennessy, D., Shalloo, L. and Brophy, C. (2018) Verification and bias correction of ECMWF forecasts for Irish weather stations to evaluate their potential usefulness in grass growth modelling. Meteorological Applications, 25: 292-301.
  • Guy, C., Hennessy, D., Gilliland, T. J., Coughlan, F. and McCarthy, B. (2018) Growth, morphology and biological nitrogen fixation potential of perennial ryegrass-white clover swards throughout the grazing season. Journal of Agricultural Science, 156: 188-199.
  • Egan, M., Galvin, N. and Hennessy, D. (2018) Incorporating white clover (Trifolium repens L.) into perennial ryegrass (Lolium perenne L.) swards receiving varying levels of nitrogen fertiliser: effects on milk and herbage production. Journal of Dairy Science, 101:3412–3427.
  • O’Callaghan T, Vázquez-Fresno R, Serra-Cayuela A, Dong E, Mandal R, Hennessy D, McAuliffe S, Dillon P, Wishart D, Stanton C and Ross, P. (2018) Pasture Feeding Changes the Bovine Rumen and Milk Metabolome. Metabolites 8(2):27, http://www.mdpi.com/2218-1989/8/2/27
  • Gulati, A., Galvin, N., Lewis, E., Hennessy, D., O’Donovan, M., McManus, J.J., Fenelon, M.A. and Guinee, T.P. (2018) Outdoor grazing of dairy cows on pasture versus indoor feeding on total mixed ration: Effects on gross composition and mineral content milk during lactation. Journal of Dairy Science 101: 2710–2723.
  • Faulkner H., O'Callaghan T.F., McAuliffe S., Hennessy D., Stanton C., O'Sullivan M.G., Kerry J.P., Kilcawley K.N. (2018) Effect of different forage types on the volatile and sensory properties of bovine milk. Journal of Dairy Science, 101: 1034-1047; doi https://doi.org/10.3168/jds.2017-13141.
  • O’Brien, B. And Hennessy, D. (2017) Scientific appraisal of the Irish grass-based milk production system as a sustainable source of premium quality milk and dairy products. Irish Journal of Agriculture and Food Research, 56: 120-129.
  • O’Callaghan, T.F., Mannion, D., Hennessy, D., McAuliffe, S., O’Sullivan, M.G., Leeuwendaal, N., Beresford, T., Dillon, P., Kilcawley, K.N., Sheehan, J.J., Ross, R.P. and Stanton, C. (2017)  Effect of pasture versus indoor feeding systems on quality characteristics, nutritional composition, and sensory and volatile properties of full-fat Cheddar cheese. Journal of Dairy Science, 100: 6053-6073.
  • Forrestal, P.J., Harty, M.A., Carolan, R., Watson, C.J., Lanigan, G.J., Wall, D.P., Hennessy, D. and Richards, K.G. (2017) Can the agronomic performance of urea equal calcium ammonium nitrate across nitrogen rates in temperate grassland? Soil Use and Management, 33: 243-251.
  • Egan, M, Lynch., M.B. and Hennessy, D. (2017) Including white clover in nitrogen fertilized perennial ryegrass swards: effects on dry matter intake and milk production of spring calving dairy cows. Journal of Agricultural Science, 155: 657–668.
  • Harty, M.A., Forrestal, P.J., Carolan, R., Watson, C.J., Hennessy, D., Lanigan, G.J., Wall, D.P. and Richards, K.G. (2017) Temperate grassland yields and nitrogen uptake are influenced by fertilizer nitrogen source. Agronomy Journal, 109: 71-79.
  • O. Fenton, P.-E. Mellander, K. Daly, D. Wall, M.M.R Jahangir, P. Jordan, D. Hennessy, M. Huebsch, P. Blum, S. Vero and K. G Richards. (2017) Integrated assessment of agricultural nutrient pressures and legacies in karst landscapes. Agriculture, Ecosystems and Environment, 239: 246–256.
  • O’Callaghan, T.F., Hennessy, D., McAuliffe, S., Kilcawley, K.N., O’Donovan, M., Dillon, P., Ross R.P. and Stanton, C. (2016) Effect of pasture versus indoor feeding systems on raw milk composition and quality over an entire lactation. Journal of Dairy Science, 99: 9424-9440.
  • O'Callaghan, T.F., Faulkner, H., McAuliffe, S., O'Sullivan, M., Hennessy, D., Dillon, P., Kilcawley, K.N., Stanton, C. and Ross, R.P. (2016) Quality characteristics, chemical composition, and sensory properties of butter from cows on pasture versus indoor feeding systems. Journal of Dairy Science, 99: 9441–9460.
  • Enriquez-Hidalgo, D., Gilliland, T. and Hennessy, D. (2016) Herbage and nitrogen yields, fixation and transfer by white clover to companion grasses in grazed swards under different rates of nitrogen fertilization. Grass and Forage Science, 71: 559-574.
  • Wingler, A. and Hennessy, D. (2016) Limitation of Grassland Productivity by Low Temperature and Seasonality of Growth. Frontiers in Plant Science, 7: 1130. doi: 10.3389/fpls.2016.01130
  • Minet, E.P., Ledgard, S.F., Lanigan, G.J., Murphy, J.B., Grant, J., Hennessy, D., Lewis, E., Forrestal, P. and Richards, K.G. (2016) Mixing dicyandiamide (DCD) with supplementary feeds for cattle: an effective method to deliver a nitrification inhibitor in urine patches. Agriculture, Ecosystems and Environment. 231: 114 - 121
  • O’Connor, P.J., Minogue, D., Lewis, E., Lynch, M.B. and Hennessy, D. (2016) Applying urine collected from non-lactating dairy cows dosed with dicyandiamide (DCD) to lysimeters and grass plots: effects on nitrous oxide emissions and nitrate leaching, and on herbage production. Journal of Agricultural Science, 154: 674-688.
  • Creighton, P., Kennedy, E., Hennessy, D. and O’Donovan, M. (2016) Impacts of Sward Renewal Method with Perennial Ryegrass (Lolium perenne) on Dry Matter Yield, Tiller Density and Nitrate Leaching. American Journal of Plant Sciences, 7: 684-694.
  • McCarthy, B., Egan, M. and Hennessy D. (2016) Opportunities and risks of combining high inputs of inorganic N with forage legumes. Legume Perspectives 12: 29-30.
  • McCarthy, J., Delaby, L., Hennessy, D., McCarthy, B., Ryan, W., Pierce, K.M., Brennan, A. and Horan, B. (2015) The effect of stocking rate on soil solution nitrate concentrations beneath a free-draining dairy production system in Ireland. Journal of Dairy Science 98: 4211-4224.
  • Beecher, M., Hennessy, D., Boland, T.M., McEvoy, M., O’Donovan, M., Lewis, E. (2015) The variation in morphology of perennial ryegrass cultivars throughout the grazing season and effects on organic matter digestibility. Grass and Forage Science 70, 19-29.
  • Cahalan, E., Ernfors, M., Muller, C., Devaney, D., Laughlin, R.J., Watson, C.J., Hennessy, D., Grant, J., McGeough, K.L., Richards, K. and Khalil, M.I. (2015). The effect of the nitrification inhibitor dicyandiamide (DCD) on nitrous oxide and methane emissions after cattle slurry application to Irish grassland. Agriculture, Ecosystems and Environment 199, 339-349.
  • Enriquez-Hidalgo, D., Hennessy, D., Gilliland, T., Egan, M.,  Mee J.F. and Lewis, E. (2014)  Effect of rotationally grazing perennial ryegrass white clover or perennial ryegrass only swards on dairy cow feeding behaviour, rumen characteristics and sward depletion patterns. Livestock Science 169: 48-62.
  • van den Pol-van Dasselaar A., Golinski P., Hennessy D., Huyghe C., Parente G., Peyraud J.L. (2014) Evaluation des fonctions des prairies par les acteurs européens. (Appreciation of grassland functions by European stakeholders) Fourrages, 218, 141-146.
  • Huebsch, M., Fenton, O., Horan, B., Hennessy, D., Richards, K., Jordan, P., Goldscheider, N., Butscher, C. and Blum, P. (2014). Mobilisation or dilution? Nitrate response of karst springs to high rainfall events. Hydrology and Earth System Sciences 11: 4131-4161.
  • Tuñon, G., Lopez Villalobos, N., O’Donovan, M., Hennessy, D., Kemp, P. and Kennedy, E. (2014) Spring and autumn animal treading effects on pre-grazing herbage mass and tiller density on two contrasting pasture types in Ireland. Grass and Forage Science, 62: 502 – 513.
  • Enriquez-Hidalgo, D., Gilliland, T., O’Donovan, M., Deighton, M. and Hennessy, D. (2014) The effect of grass white clover swards on herbage production, herbage dry matter intake, enteric methane emissions and milk production of dairy cows. Journal of Dairy Science, 97: 1400 – 1412.
  • Tuñon, G., Kennedy, E., Horan, B., Hennessy, D., Lopez Villalobos, N., Kemp, P., Brennan, A. and O’Donovan, M. (2014) Effect of grazing severity on perennial ryegrass herbage production and sward structural characteristics throughout an entire grazing season. Grass and Forage Science. 69: 104-118.
  • Hurtado-Uria, C., Hennessy, D., Shalloo, L., O'Connor, D. and Delaby, L. (2013) Relationships between meteorological data and grass growth over time in the south of Ireland, Irish Geography, 46: 175-201  DOI: 10.1080/00750778.2013.865364
  • O’Connor, P.J.,  Lynch, M.B., Cahalan, E., O’Donovan M. and Hennessy, D. (2013) The effect of the nitrification inhibitor dicyandiamide (DCD) on spring and annual herbage production in urine patches when applied in late summer or early autumn. Grass and Forage Science, 68: 564-576.
  • O’Connor, P.J., Hennessy, D., Lynch, M.B., Slattery, H. and Lewis, E. (2013) The effect of dicyandiamide on rumen and blood metabolites, diet digestibility and urinary excretion. Livestock Science. 155: 30 – 37.
  • Hurtado-Uria, C., Hennessy, D., Shalloo, L., Schulte, R.P.O. Delaby, L. and O’Connor, D. (2013). Evaluation of three grass growth models to predict grass growth in Ireland. Journal of Agricultural Science, 151, 91-104.
  • Jahangir, M.M.R., Johnston, P., Khalil, M.I.., Hennessy, D., Humphreys, J., Fenton, O. and Richards, K.G. (2012) Groundwater: A pathway for terrestrial C and N losses and indirect greenhouse gas emissions. Agriculture, Ecosystems and Environment. 159, 40-48
  • Ryan, W., Hennessy, D., Boland, T.M. and Shalloo, L. (2012) The effect of grazing season length on nitrogen utilisation, efficiency and nitrogen balance in spring calving dairy production systems. Journal of Agricultural Science, 150: 630-643
  • O’Connor, P.J., Hennessy, D., Brophy, C., O’Donovan, M. and Lynch, M.B. (2012) The effect of the nitrification inhibitor dicyandiamide (DCD) on herbage production when applied at different times and rates in the autumn and winter. Agriculture, Ecosystems and Environment, 152: 79– 89
  • Rafique, R., Anex, R., Hennessy, D. and Kiely, G. (2012) What are the impacts of grazing and cutting events on the N2O dynamics in humid temperate grassland? Geoderma, 181–182: 36–44
  • Dennis, S.J., Moir, J.L., Cameron, K.C., Di., H.J., Hennessy, D. and Richards, K.G. (2011) Urine patch distribution under dairy grazing at three stocking rates in Ireland. Irish Journal of Agriculture and Food Research, 50: 149-160.
  • Gilliland, T.J., Hennessy, D. and Griffith, V. (2011) Studies into the dynamics of perennial ryegrass (Lolium perenne L.) seed mixtures. Irish Journal of Agriculture and Food Research, 50: 99-112.
  • Rafique, R., Peichl, M., Hennessy, D. and Kiely, G. (2011) Evaluating management effects on nitrous oxide emissions from grasslands using the process-based DeNitrificationeDeComposition (DNDC) model. Atmospheric Environment, 45: 6029 - 6039
  • Rafique, R., Hennessy, D. and Kiely, G. (2011) Nitrous Oxide Emission from Grazed Grassland under Different Management Systems. Ecosystems, 14: 563–582.
  • Herbin, T., Hennessy, D., Richards, K.G., Piwowarczyk, Murphy, J.J. and Holden, N.M. (2011) The effects of dairy cow weight on selected soil physical properties indicative of compaction. Soil Use and Management, 27: 36-44.
  • Ryan, W., Hennessy, D., Murphy, J.J., Boland, T.M. and Shalloo, L. (2011) A model of nitrogen efficiency in contrasting grass-based dairy systems. Journal of Dairy Science, 94: 1032-1044.
  • Ryan, W., Hennessy, D., Murphy, J.J. and Boland, T.M. (2010) The effects of autumn closing date on sward leaf area index and herbage mass during the winter period. Grass and Forage Science, 65: 200-211.
  • Hennessy, D., O’Donovan, M., French, P. and Laidlaw, A.S. (2008) Manipulation of herbage production by altering nitrogen application pattern. Grass and Forage Science, 63: 152-166.
  • Hennessy, D., O’Donovan, M., French, P. and Laidlaw, A.S.  (2008) Factors influencing tissue turnover during winter in perennial ryegrass dominated swards. Grass and Forage Science, 63:202-211.
  • Hennessy, D., O’Donovan, M., French, P. and Laidlaw, A.S.  (2006) The effects of date of autumn closing and timing of winter grazing on herbage production in winter and spring. Grass and Forage Science, 61: 363-374.

 

  • MaryAnne Hurley
  • Ellen Fitzpatrick