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Huhtanen, Pekka J.

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Publications

individual publications

• academic article

  • Updates to the Cornell Net Carbohydrate and Protein System: Effects of changes in feed digestion rates and passage rate assignments on metabolizable energy and protein predictions.  Journal of Dairy Science.  91:265. 2008
  • Omasal sampling technique in estimation of the site and extent of mineral absorption in dairy cows fed rapeseed and soybean expellers.  Agricultural and Food Science.  3:200-218. 2006
  • Evaluation of milk urea nitrogen as a diagnostic of protein feeding.  Journal of Dairy Science.  87:386-398. 2004
  • Prediction of indigestible cell wall fraction of grass silage by near infrared reflectance spectroscopy.  Animal Feed Science and Technology.  115:295-311. 2004
  • The effect of concentrate crude protein content and feeding strategy of total mixed ration on performance of primiparous dairy cows.  Livestock Production Science.  85:223-233. 2004
  • Comparison of heat-treated rapeseed expeller and solvent-extracted soya-bean meal protein supplements for dairy cows given grass silage-based diets.  Animal Science.  77:305-317. 2003
  • Composition and digestive tract retention time of ruminal particles with functional specific gravity greater or less than 1.02.  Journal of Animal Science.  81:2639-2648. 2003
  • Determination of digesta flow entering the omasal canal of dairy cows using different marker systems..  British Journal of Nutrition.  90:41-52. 2003
  • Effect of dietary fish oil on biohydrogenation of fatty acids and milk fatty acid content in cows.  Animal Science.  77:165-179. 2003
  • Effect of feeding protein supplements of differing degradability on omasal flow of microbial and un degraded protein.  Journal of Dairy Science.  86:1292-1305. 2003
  • Effects of casein and glucose on responses of cows fed diets based on restrictively fermented grass silage.  Journal of Dairy Science.  86:3260-3270. 2003
  • Effects of various glucogenic sources on production and metabolic responses of dairy cows fed grass silage-based diets.  Journal of Dairy Science.  86:3249-3259. 2003
  • Prediction of the digestibility of primary growth and regrowth grass silages from chemical composition, pepsin-cellulase solubility and indigestible cell wall content.  Animal Feed Science and Technology.  110:61-74. 2003
  • Prediction of the digestibility of the primary growth of grass silages harvested at different stages of maturity from chemical composition and pepsin-cellulase solubility.  Animal Feed Science and Technology.  103:97-111. 2003
  • Relationships between silage fermentation characteristics and milk production parameters: analyses of literature data.  Livestock Production Science.  81:57-73. 2003
  • The effect of constant or variable forage to concentrate ratio in total mixed ration on performance of primiparous dairy cows.  Livestock Production Science.  82:27-37. 2003
  • Quantification of the flow of soluble non-ammonia nitrogen entering the omasal canal of dairy cows fed grass silage based diets.  Animal Feed Science and Technology.  96:203-220. 2002
  • Supplementing barley or rapeseed meal to dairy cows fed grass-red clover silage: I. Rumen degradability and microbial flow.  Journal of Animal Science.  80:2176-2187. 2002
  • Comparison of the Ruminal Metabolism of Nitrogen from 15N-Labeled Alfalfa Preserved as Hay or Silage.  Journal of Dairy Science.  84:2738-2750. 2001
  • Comparison of tracer and non-tracer method for estimation of volatile fatty acid production rate in the rumen of sheep fed two levels of intake.  British Journal of Nutrition.  86:331-340. 2001
  • Effect of heterogenous digesta chemical composition on the accuracy of measurements of fiber flow in dairy cows..  Journal of Animal Science.  79:1611-1620. 2001
  • Effects of level of nitrogen fertilizer application and various nitrogenous supplements on milk production and nitrogen utilization of dairy cows given grass silage-based diets.  Animal Science.  73:541-554. 2001
  • Effects of type and treatment of grain and protein source on dairy cow performance.  Animal Science.  72:573-584. 2001
  • Estimating passage kinetics using fibre-bound 15N as an internal marker.  Animal Feed Science and Technology.  92:29-41. 2001
  • Determination of forestomach digestion in lactating dairy cows by omasal or duodenal sampling.  British Journal of Nutrition.  83:67-77. 2000
  • Effects of sodium and potassium fertilization on nutritive value of timothy grown on different soil.  Agricultural and Food Science in Finland.  9:105-120. 2000
  • Responses to graded postruminal doses of histidine in dairy cows fed grass silage diets.  Journal of Dairy Science.  83:2596-2608. 2000
  • Association between protein nutrition and reproductive performance in the dairy cos. A review with specific emphasis on protein feeding in Finland.  Agricultural and Food Science in Finland.  8:365-392. 1999
  • Lactation and metabolic responses to graded abomasal doses of methionine and lysine in cows fed grass silage diets.  Journal of Dairy Science.  82:2659-2673. 1999
  • Response of dairy cows fed grass silage diets to abomasal infusions of histidine alone or in combinations with methionine and lysine.  Journal of Dairy Science.  82:2674-2685. 1999
  • Effects of silage fermentation and postruminal casein supplementation in lactating dairy cows. 1. Diet digestion and milk production.  Journal of the Science of Food and Agriculture.  74:450-458. 1997
  • Effects of silage fermentation and postruminal casein supplementation in lactating dairy cows. 2. Blood metabolites and amino acids.  Journal of the Science of Food and Agriculture.  74:459-468. 1997
  • Grass maturity effects on cattle fed silage-based diets. 1. Organic matter digestion, rumen fermentation and nitrogen utilization.  Animal Feed Science and Technology.  67:1-17. 1997
  • Omasal sampling technique for assessing fermentative digestion in the forestomach of dairy cows.  Journal of Animal Science.  75:1380-1392. 1997
  • Effects of physical treatment of barley and rapeseed meal in dairy cows given grass silage-based diets.  Agricultural and Food Science in Finland.  5:399-412. 1996
  • Effects of stage of growth and duration of rumen incubation time on digestibility of rumen-undegradable nitrogen of grass by mobile-bag method in cows.  Acta Agriculturae Scandinavica, Section A - Animal Science.  46:1-10. 1996
  • The effects of ruminal propionate to butyrate ratio on milk production and blood metabolites in dairy cows fed a grass silage based diet.  Journal of Dairy Science.  79:851-861. 1996
  • The influence of molasses and yeast culture on the performance of growing bulls on grass silage-based diet.  Journal of Animal and Feed Sciences.  5:201-215. 1996
  • Comparison of methods, markers and sampling sites for estimating digesta passage kinetics in cattle fed at two levels of intake.  Animal Feed Science and Technology.  52:141-158. 1995
  • Ruminal plant cell wall digestibility and passage kinetics utilizing mathematical models.  Animal Feed Science and Technology.  52:159-173. 1995
  • The AAT/PVT protein evaluation system for ruminants. A revision.  Norwegian Journal of Agricultural Sciences.  Supplement 19:37. 1995
  • The effects of concentrate energy source on milk production of dairy cows given a grass silage-based diet.  Animal Science.  60:31-40. 1995
  • Influence of grass maturity and diet on ruminal dry matter and neutral detergent fibre digestion kinetics.  Archives of Animal Nutrition.  47:153-167. 1994
  • The use of internal markers to predict total digestibility and duodenal flow of nutrients in cattle given six different diets.  Animal Feed Science and Technology.  48:211-227. 1994
  • Sucrose supplements in cattle given grass silage based diet. 1. Digestion of organic matter and nitrogen.  Animal Feed Science and Technology.  33:247-261. 1991
  • Sucrose supplements in cattle given grass silage based diet. 2. Digestion of cell wall carbohydrates.  Animal Feed Science and Technology.  33:262-273. 1991
  • Sucrose supplements in cattle given grass silage based diet. 3. Rumen pool size and digestion kinetics.  Animal Feed Science and Technology.  33:275-287. 1991
  • The effect of cell wall degrading enzymes or formic acid on fermentation quality and on digestion of grass silage by cattle.  Grass and Forage Science.  46:75-87. 1991
  • Fermentation quality of grass silage treated with enzymes or formic acid and nutritive value in growing cattle fed with or without fishmeal.  Acta Agriculturae Scandinavica.  40:403-414. 1990
  • The response to cellulase treatment of silage and replacement of barley by unmolassed sugar beet pulp in the diets of growing cattle.  Acta Agriculturae Scandinavica.  40:415-426. 1990
  • By-products from integrated starch-ethanol production from barley in the diets of growing cattle.  Journal of Agricultural Science in Finland.  61:451-462. 1989
  • The concentrations of blood metabolites and relations between blood parameters, fatty acid composition of milk and estimated ME-balance in dairy cows given grass silage ad libitum with five different carbohydrates.  Acta Agriculturae Scandinavica.  39:319-330. 1989
  • Silage intake and milk production in cows given barley or barley fibre with or without dried distiller's solubles.  Journal of Agricultural Science in Finland.  60:723-733. 1988
  • The effect of dietary inclusion of starch, sucrose and xylose on the utilization of dietary energy in sheep.  Animal Feed Science and Technology.  21:11-21. 1988
  • The effects of supplementation of silage diet with barley, unmolassed sugar beet pulp and molasses on organic matter, nitrogen and fibre digestion in the rumen of cattle.  Animal Feed Science and Technology.  20:259-278. 1988
  • The effect of dietary inclusion of barley, unmolassed sugar beet pulp and molasses on milk production, digestibility and digesta passage in dairy cows given silage based diet.  Journal of Agricultural Science in Finland.  59:101-120. 1987
  • The effects of intraruminal infusions of sucrose and xylose on the nitrogen and fibre digestion in the rumen of cattle receiving diets of grass silage and barley.  Journal of Agricultural Science in Finland.  59:405-424. 1987

• conference paper

  • Effects of soil characteristics and fertilizer application on grass yield and chemical composition including mineral and trace element contents - farm scale studies in Finland during 1995-2004.  Essential trace elements for plants, animals and humans: NJF Seminar 370. 21-23. 2005
  • Grass silage: factors affecting efficiency of N utilisation in milk production.  Silage production and utilisation: Proceedings of the 14th International Silage Conference. 35-50. 2005
  • Nutrient Digestion and Utilization in Farm Animals: Modelling approaches.  The Nordic Dairy Cow Model, Karoline -Evaluation. 407-415. 2005
  • Nutrient Digestion and Utilization in Farm Animals: Modelling approaches.  The Nordic Dairy Cow Model, Karoline -Description. 383-406. 2005
  • The Nordic dairy cow model, Karoline -Develpment of volatile fatty acid sub-model.  Nutrient Digestion and Utilization in Farm Animals: Modelling approaches. 1-14. 2005
  • Digestion and absorption.  Karoline Seminars : proceedings from seminars held at SLU, Uppsala. 25-34. 2004
  • Digestion kinetics of NDF in dairy cows fed silages from primary growth and regrowth of grass.  Journal of Animal and Feed Sciences. 2004
  • Model and evaluation.  Karoline Seminars : proceedings from seminars held at SLU, Uppsala. 2004
  • Passage kinetics of internal and external markers in lactating dairy cows.  Journal of Animal and Feed Sciences. 2004
  • Rapeseed and soybean as protein supplements of dairy cows fed grass silage based diets.  Proceedings of the 11th International Rapeseed Congress: The Royal Veterinary and Agricultural University, Copenhagen, Denmark. 1238-1240. 2003
  • Efficiency of N utilisation in milk production.  Proceedings of the NJF's 2200 congress 'Nordic Agriculture in Global Perspective'. Turku, Finland. 1-5. 2003
  • Factors influencing on voluntary intake of silage-based diets, and the responses of silage quality in milk production.  Proceedings of the International symposium: Early harvested forage in milk and meat production.' Kringler, Nannestad Norway. Ås. 59-82. 2003
  • Optimisation of feeding of dairy cows in the long term.  Farm management.Proceedings of NIF seminar no. 345.. NILF-report 2/2003. 93-104. 2003
  • Prediction of digestibility of primary and regrowth grass silages with a cellulase technique.  Conference Proceedings the Xillth International Silage Conference, September 11-13,2002 Auchincruive Scotland. SAC. 296-297. 2002
  • Automated System in MTT for measuring gas production from in vitro fermentation.  International Conference of Animal Nutrition in Tartu, Estonia. 88-93. 2002
  • Effects of supplementing grass silage with protein on production of primiparous cows in late lactation.  Multi-function grasslands: quality forages, animal products and landscapes: Proceedings of the 19th General Meeting of the European Grassland Federation, La Rochelle, France.. 594-595. 2002
  • Modelling D-value development in grass regrowth less useful than in primary growth.  Conference Proceedings the Xillth International Silage Conference, September 11-13,2002 Auchincruive Scotland. SAC. 286-287. 2002
  • New developments in the prediction of intake of silage based diets.  Proceedings of the XIIIth International Silage Conference. 2002 Auchincruive Scotland. SAC. 236-251. 2002
  • Prediction of DM and ME intake of dairy cows fed grass silage based diets.  Production and utilization of silage, with emphasis on new techniques, NJF seminar no. 326, Lillehammer, Norway. 52-63. 2002
  • Factors influencing intake of grass silage.  10th International Symposium: forage conservation 10-12. September, 2001 Brno, Czech Republic. 55-66. 2001
  • A comparison of protein evaluation systems used in the Nordic countries.  Proceedings of International Conference of Animal Nutrition in Tartu. Tartu, Estonia. 7-11. 1998
  • The effects of two levels of concentrates supplying the same amount of protein on silage intake and milk production in cows given two grass silages.  Proceedings of the XVIII International Grassland Congress. Winnipeg, Manitoba, Saskatoon, Saskatchewan. 3-4. 1997
  • Effects of inoculant and formic acid-treated silages and protein supplementation on milk production.  Proceedings of the 11th International Silage Conference. 208-209. 1996
  • Effects of lactic acid addition at ensiling on grass preservation.  Proceedings of the 16th General Meeting of the European Grassland Federation, Grado (Gorizia), Italy. 457-460. 1996
  • Effects of lactic acid addition at ensiling on grass preservation.  Proceedings of the 16lh EGF Meeting. 457-460. 1996
  • Effects of restriction of silage fermentation with formic acid on milk production.  Proceedings of the XI International Silage Conference. 76-77. 1996
  • Effects of silage fermentation and postruminal casein infusion in lactating dairy cows.  Proceedings of the 11th International Silage Conference. 94-95. 1996
  • Maturity effects of grass ensiled on diet digestion by dairy cows.  Proceedings of the 11th International Silage Conference. 196-197. 1996
  • The effects of physical treatment of barley and rapeseed meal in dairy cows given grass silage.  British Society of Animal Science Winter Meeting 1995. Scarborough, UK. Paper No 148. 2. 1995
  • The effects or ruminal and duodenal casein infusion on intake of red clocer silage, milk production and microbial protein synthesis.  British Society of Animal Science Winter Meeting 1995. Scarborough, UK. Paper No 123. 2. 1995
  • Barley fibre and wet distiller' solubles in the diets of growing cattle given a grass silage based diet.  Proceedings of the 10th International Conference on Silage Research, 6. -8.9.1993, Dublin City University, Ireland. 204-205. 1993
  • Effect of ingestive mastication on chemical composition of grass silage.  Proceedings of the 10th International Conference on Silage Research, Dublin City University, Ireland. 161-162. 1993
  • The effect of concentrate com-position on feed intake and milk production in cows given formic acid-treated grass silage.  Proceedings of the 10th International Conference on Silage Research, Dublin City University, Ireland. 232-233. 1993
  • Nutritive value and application of feed fractions from integrated ethanol-starch process based on barley.  Polish-Finnish Seminar: Domestic Protein Utilization. Jablonna, Warsaw. 8. 1988

• document part

  • Challenges in utilization of high protein forages by lactating dairy cows 2006
  • A review of the 2001 dairy cattle protein and amino acid model - A European perspective 2005
  • Artturi assists Finnish advisers and farmers to succeed in grass-based dairy production.  921. 2005
  • Comparison of concentrate feeding strategies for growing bulls.  258. 2005
  • Development of a deterministic model to create a dairy herd.  350. 2005
  • Estimation of legume silage digestibility with various laboratory methods.  267. 2005
  • Lypsikki - an optimization procedure for dairy cow rations 2005
  • Prediction of indigestible NDF content of grass and legume silages by NIRS.  276. 2005
  • Quantitative importance of endogenous cis-9, trans-11 conjugated linoleic acid systhesis in dairy cows 2005
  • The effect of harvesting strategy of grass silage on milk production.  484. 2005
  • Karoline - a Nordic cow model for feed evaluation : model description.  45. 2004
  • Karoline - a Nordic cow model for feed evaluation : model validation.  47. 2004
  • In situ digestibility and rumnal retention time offeed particles with functional specific gravity higher or lower than 1.02.  200. 2001
  • Prediction of the in vivo digestibility of grass silage from gas production kinetics.  197. 2001
  • Quantitative aspects of digestion in ruminants with special reference to reindeer.  18. 2001
  • Effects of silage fermentation on milk protein and fat content and yield.  150. 2000
  • Prediction of intake potential of unwilted grass silage by dairy cows.  2. 2000
  • Assesment of soluble dietary non-ammonia nitrogen flow into the omasum of dairy cows given grass silage-based diets 1999
  • Lactation and metabolic responses to graded doses of postrurninal histidine infusion in dairy cows fed grass silage-cereal diet.  79. 1999
  • Evaluation of nutritional factors influencing milk urea concentrations.  316. 1998
  • In vivo metabolism of 15N-labeled alfalfa preserved as hay or silage.  333. 1998
  • The influence of forage preservation method, concentrate level and propyle glycol on dry matter intake and milk production.  321. 1998
  • Lactational and metabolic responses to abomasal methionine and lysine infusion sin dairy cows fed grass silage based diet.  249. 1997
  • Response of dairy cows fed grass silage based diets to the abomasal infusions of histidine alone or in combinations with methionine and lysine.  247. 1997
  • Evaluation of models to describe neutral detergent fibre digestion in cattle fed at two levels of dry matter intake.  593. 1991
  • Rate of passage calculations based on marker or rumen evacuation technique.  592-593. 1991
  • The effect of the type of supplement on blood metabolites in dairy cows given grass silage ad libitum.  459. 1988
  • The relation between some blood metabolites, fatty acid composition of milk and ME-balance.  458. 1988

Service

service to the profession

• Estonian Agricultural University, Tartu Post Honorary Doctor 2003 -
• Academia Scientiarium Fennica Member 2002 -

Background

education and training

• Ph.D. in, University of Helsinki 1987
• M.S. in, University of Helsinki 1981

Other

alternate name

• Pekka Humphries

college

• CALS