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The potential to reduce poultry nitrogen emissions with dietary methionine or methionine analogues supplementation

Published online by Cambridge University Press:  18 September 2007

W.K. Kim ,
C.A. Froelich Jr. ,
P.H. Patterson  and
S.C. Ricke
W.K. Kim
Affiliation:
Poultry Science Dept., Texas A&M University, College Station, TX 77843;
C.A. Froelich Jr.
Affiliation:
Poultry Science Dept., Texas A&M University, College Station, TX 77843;
P.H. Patterson
Affiliation:
Department of Poultry Science, The Pennsylvania State University, 213 Henning Bldg., University Park, PA 16802;
S.C. Ricke*
Affiliation:
Poultry Science Dept., Texas A&M University, College Station, TX 77843;
*
*Corresponding author: sricke@uark.edu
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Abstract

One of the environmental challenges that the poultry industry has been faced with is manure utilization or disposal. Poultry manure and its nitrogenous compounds can be a potential pollutant causing eutrophication, nitrate or nitrite contamination of water, ammonia volatilization, and acid deposition in the air. Therefore, reducing nitrogen excretion and emissions in poultry manure is important to maintain a clean environment. Proper nutrition is an important first step to optimize performance and growth in animals as well as to reduce the negative impacts on the environment. Amino acids are components of protein nutrition that greatly influence growth and one of the essential amino acids is methionine, which is often first limiting amino acid in high protein diets for poultry. However, excess or insufficient methionine supplementation into diets increases nitrogen excretion and emissions to the environment. One way to reduce nitrogen excretion and emissions is reducing crude protein level and supplementing analogues of amino acids to meet the amino acid requirements. Several analogue forms of methionine are commercially available as economic alternatives for the animals now. Supplementation of hydroxy analogues into low protein diets can minimize excess amino nitrogen in the diets and reduce nitrogen excretion. In order to use these dietary strategies effectively, a well-balanced feed formulation and a precise way of rapidly quantitating the bioavailable sulphur amino acid in feeds remains to be developed.

Keywords

methioninemethionine analoguespoultrynitrogen emissionsrapid assays
Type
Reviews
Information
World's Poultry Science Journal , Volume 62 , Issue 2 , June 2006 , pp. 338 - 353
Copyright
Copyright © Cambridge University Press 2006

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References

Ahmed, H.A., Roland, D.A. Sr., Bryant, M.M. and Self, J. (1997) Effects of increased light and added methionine on moulted hens. Journal of Applied Poultry Research 6: 373–380.CrossRefGoogle Scholar
Bachrach, U. (1997) The aerobic breakdown of uric acid by certain pseudomonads. Journal of General Microbiology 17: 1–11.Google Scholar
Baker, D.H. (1997) Chapter 13. Ideal amino acid patterns for broiler chicks. In: Amino Acids in Animal Nutrition, 2nd Edition. D'Mello, J.P.F. ed. CAB International, Wallingford, UK. pp. 223–235.Google Scholar
Baker, D.H., Batal, A.B., Parr, T.M., Augspurger, N.R. and Parsons, C.M. (1997) Ideal ratio (relative to lysine) of tryptophan, threonine, isoleucine, and valine for chicks during the second and third weeks posthatch. Poultry Science 81: 485–494.Google Scholar
Baker, D.H. and Boebel, K.P. (1997) Utilization of the D- and L-isomers of methionine and methionine hydroxy analogue as determined by chick bioassay. Journal of Nutrition 110: 959–964.Google Scholar
Baker, D.H. and Han, Y. (1997) Ideal amino acid profile for chicks during the first three weeks posthatching. Poultry Science 73: 1441–1447.CrossRefGoogle Scholar
Beck, C.R., Harms, R.H. and Russell, G.B. (1997) Is the cystine content of the diet of concern for broilers from 0 to 21 days of age? Journal of Applied Poultry Research 7: 233–238.Google Scholar
Bentley, A., Atkinson, A., Jezek, J. and Rawson, D.M. (1997) Whole cell biosensors - electrochemical and optical approaches to ecotoxicity testing. Toxicology in Vitro 15: 469–475.CrossRefGoogle Scholar
Blair, R., Jacob, J.P., Ibrahim, S. and Wang, P. (1997) A quantitative assessment of reduced protein diets and supplements to improve nitrogen utilization. Journal of Applied Poultry Research 8: 25–47.CrossRefGoogle Scholar
Boebel, K.P. and Baker, D.H. (1982a) Efficacy of the calcium salt and free acid forms of methionine hydroxy analogue for chicks. Poultry Science 61: 1167–1175.CrossRefGoogle Scholar
Boebel, K.P. and Baker, D.H. (1982b) Comparative utilization of the α-keto and D- and L-α-hydroxy analogues of leucine, isoleucine, and valine by chicks and rats. Journal of Nutrition 112: 1929–1939.CrossRefGoogle Scholar
Bongaerts, G.P.A., Uitzetter, J., Brouns, R. and Vogels, G.D. (1997) Uricase of Bacillus fastidious properties and regulation of synthesis. Biochimica Biophysica Acta 527: 348–358.CrossRefGoogle Scholar
Carey, J.B., Lacey, R.E and Mukhtar, S. (1997) A review of literature concerning odors, ammonia, and dust from broiler production facilities: 2. Flock and house management factors. Journal of Applied Poultry Research 13: 509–513.Google Scholar
Carlile, F.S. (1997) Ammonia in poultry houses: A literature review. World's Poultry Science 40: 99–113.CrossRefGoogle Scholar
Chamruspollert, M., Pesti, G.M. and Bakalli, R.I. (1997) Chick responses to dietary arginine and methionine levels at different environmental temperatures. British Poultry Science 45: 93–100.Google Scholar
Chang, S.I. and Fuller, H.L. (1997) Effect of tannin content of grain sorghums on their feeding value for growing chicks. Poultry Science 43: 30–36.CrossRefGoogle Scholar
Chavez, C., Coufal, C.D., Lacey, R.E. and Carey, J.B. (2004a) The impact of methionine source on poultry fecal matter odor volatiles. Poultry Science 83: 359–364.CrossRefGoogle ScholarPubMed
Chavez, C., Coufal, C.D., Carey, J.B., Lacey, R.E., Beier, R.C. and Zahn, J.A. (2004b) The impact of supplemental dietary methionine sources on volatile compound concentrations in broiler excreta. Poultry Science 83: 901–910.CrossRefGoogle ScholarPubMed
Chavez, C., Coufal, C.D., Niemeyer, P.L., Carey, J.B., Lacey, R.E., Miller, R.K. and Beier, R.C. (2004c) Impact of dietary supplemental methionine sources on sensory measurements of odorrelated compounds in broiler excreta. Poultry Science 83: 1655–1662.CrossRefGoogle ScholarPubMed
Chi, M.S. and Speers, G.M. (1997) Nutritional value of high lysine corn for the broiler chick. Poultry Science 52: 1148–1157.Google Scholar
Christensen, A.C., Anderson, J.O. and Dobson, D.C. (1997) Factors affecting efficacy of methionine hydroxy analogue for chicks fed amino acid diets. Poultry Science 59: 2480–2484.Google Scholar
Clanton, C.J. and Schmidt, D.R. (1997) Sulphur compounds in gases emitted from stored manure. Transactions of the American Society of Agricultural Engineering 43: 1229–1239.CrossRefGoogle Scholar
Cole, D.J.A. and Tuck, K. (1997) European approaches to reducing ammonia emissions. In: Proceedings in 2002 National Poultry Waste Management Symposium. Pages 59–66.Google Scholar
Cook, M.E. (1997) Nutrition and the immune response of the domestic fowl. Critical Reviews in Poultry Biology 3: 167–189.Google Scholar
Cork, L.C., Clarkson, T.B., Jacoby, R.O., Gaertner, D.J., Leary, S.L., Linn, J.M., Pakes, S.P., Ringler, D.H., Strandberg, J.D. and SWINDLE, M.M. (1997) The cost of animal research: Origins and Options. Science 276: 758–759.CrossRefGoogle ScholarPubMed
Cowieson, A.J., Acamovic, T. and Bedford, M.R. (1997) The effects of phytase and phytic acid on the loss of endogenous amino acids and minerals from broiler chickens. British Poultry Science 45: 101–108.CrossRefGoogle Scholar
Deaton, J.W., Reece, F.N. and Lott, B.D. (1997) Effect of atmospheric ammonia on pullets at point of lay. Poultry Science 63: 384–385.CrossRefGoogle Scholar
Dibner, J.J., Kitchell, M.L., Robey, W.W., Yersin, A.G., Dunn, P.A. and Wideman, R.F. Jr. (1997) Liver damage and supplemental methionine sources in the diets of mature laying hens. Journal of Applied Poultry Research 3: 367–372.CrossRefGoogle Scholar
Dibner, J.J. and Knight, C.D. (1997) Conversion of 2-hydroxy-4-(methylthio)butanoic acid to Lmethionine in the chick: A stereospecific pathway. Journal of Nutrition 114: 1716–1723.CrossRefGoogle Scholar
Dibner, J.J. (1997) Review of the metabolism of 2-hydroxy-4(methylthio) butanoic acid. World's Poultry Science Journal 59: 99–110.CrossRefGoogle Scholar
D'mello, J.F.P. (2003a) Chapter 1 Amino acids as multifunctional molecules. In: Amino Acids in Animal Nutrition, 2nd Edition. D'fMello, J.P.F. ed. CAB International, Wallingford, UK. pp. 1–14.CrossRefGoogle Scholar
D'mello, J.F.P. (2003b) Chapter 26 Conclusions. In: Amino Acids in Animal Nutrition, 2nd Edition. D'Mello, J.P.F. ed. CAB International, Wallingford, UK. pp. 485–501.CrossRefGoogle Scholar
D'mello, J.F.P. (1997) Chapter 10 Responses of growing poultry to amino acids. In: Amino Acids in Animal Nutrition. D'mello, J.P.F. ed. CAB International, Wallingford, UK. pp. 205–243.Google Scholar
Elkin, R.G. and Hester, P.Y. (1997) A comparison of methionine sources for broiler chickens fed cornsoybean meal diets under simulated commercial grow-out conditions. Poultry Science 62: 2030–2043.Google Scholar
Emmert, J.L. and Baker, D.H. (1997) Use of the ideal protein concept for precision formulation of amino acid levels in broiler diets. Journal of Applied Poultry Research 6: 462–470.CrossRefGoogle Scholar
Erickson, A.M., Li, X., Zabala- Díaz, I.B. and Ricke, S.C. (1997) Potential for measurement of lysine bioavailability in poultry feeds by rapid microbiological assays - A review. Journal of Rapid Methods and Automation in Microbiology 10: 1–8.Google Scholar
Featherston, W.R. and Horn, G.W. (1997) Studies on the utilization of the α-phydroxy acid of methionine by chicks fed crystalline amino acid diets. Poultry Science 53: 680–686.CrossRefGoogle Scholar
Ferguson, N.S., Gates, R.S., Taraba, J.L., Cantor, A.H., Pescatore, A.J., Straw, M.L., Ford, M.J. and Burnham, D.J. (1998a) The effect of dietary protein and phosphorus on ammonia concentration and litter composition in broilers. Poultry Science 77:1085–1093.CrossRefGoogle ScholarPubMed
Ferguson, N.S., Gates, R.S., Taraba, J.L., Cantor, A.H., Pescatore, A.J., Straw, M.L., Ford, M.J. and Burnham, D.J. (1998b) The effect of dietary crude protein on growth, ammonia concentration, and litter composition in broilers. Poultry Science 77: 1481–1487.CrossRefGoogle ScholarPubMed
Froelich, C.A. and Ricke, S.C. (1997) Rapid bacterial-based bioassays for quantifying methionine bioavailability in animal feeds: A review. Journal of Rapid Methods and Automation in Microbiology 13: 1–10.CrossRefGoogle Scholar
Froelich, C.A., Zabala Díaz, I.B., Chalova, V.I., Kim, W.K. and Ricke, S.C. (1997) Quantifying methionine with a green fluorescent Eschericha coli methionine axotroph. Journal of Rapid Methods and Automation in Microbiology 13: 193–203.CrossRefGoogle Scholar
Froelich, C.A., Zabala Díaz, I.B. and Ricke, S.C. (2002a) Methionine auxotroph Escherichia coli growth assay kinetics in antibiotic and antifungal amended selective media. Journal of Environmental Science and Health B37: 485–492.Google Scholar
Froelich, C.A., Zabala Díaz, I.B. and Ricke, S.C. (2002b) Construction and growth kinetics of a bioluminescent methionine auxotroph Escherichia coli strain for potential use in a methionine bioassay. Journal of Rapid Methods and Automation in Microbiology 10: 69–82.CrossRefGoogle Scholar
Froelich, C.A., Zabala Díaz, I.B. and Ricke, S.C. (2002c) Potential rapid bioassay for alimetR using a methionine Escherichia coli auxotroph. Journal of Rapid Methods and Automation in Microbiology 10: 161–172.CrossRefGoogle Scholar
Fuller, H.L., Chang, S.I. and Potter, D.K. (1997) Detoxification of dietary tannic acid by chicks. Journal of Nutrition 91: 477–481.Google Scholar
Garlich, J.D. (1997) Response of broilers to DL-methionine hydroxy analogue free acid, DL-methionine, and L-methionine. Poultry Science 64: 1541–1548.Google Scholar
Harper, A.E., Benevenga, N.J. and Wohlhueter, R.M. (1997) Effects of ingestion of disproportionate amounts of amino acids. Physiology Reviews 50: 428–558.Google Scholar
Harter, J.M. and Baker, D.H. (1997) Sulphur amino acid activity of glutathione, DL-α-hydroxymethionine, and α-keto-methionine in chicks. Proceeding of the Society for Experimental Biology and Medicine 156: 201–204.CrossRefGoogle Scholar
Hitchins, A.D., Mcdonough, F.E. and Wells, P.A. (1997) The use of Escherichia coli mutants to measure the bioavailability of essential amino acids in foods. Plant Foods for Human Nutrition 39: 109–120.CrossRefGoogle Scholar
Hsu, J.C., Lin, C.Y. and Chiou, P.W.S. (1997) Effects of ambient temperature and methionine supplementation of a low protein diet on the performance of laying hens. Animal Feed Science and Technology 74: 289–299.Google Scholar
Hungate, R.E. (1997) Bacterial ecology in the small intestine. The American Journal of Clinical Nutrition 31: S125–S127.CrossRefGoogle Scholar
Ishibashi, T. and Ohta, Y. (1997) Recent advances in poultry nutrition for efficient poultry production. Asian-Australian Journal of Animal Science 13: 47–54.Google Scholar
Jones, B.A., Mohamed, O.E., Prange, R.W. and Satter, L.D. (1997) Degradation of methionine hydroxy analogue in the rumen of lactating cows. Journal of Dairy Science 71: 525–529.CrossRefGoogle Scholar
Kadota, H. and Ishida, Y. (1997) Production of volatile sulphur compounds by microorganisms. Annual Reviews of Microbiology 26:127–138.Google Scholar
Karube, I. and Sangmok Chang., M.E. (1997) Chapter 12 Microbial biosensors. In: Biosensor Principles and Application. Blum, L.J. and Coulet, P.R eds. Marcel Dekker, Inc., New York, NY. pp. 267–301.Google Scholar
Katz, R.S. and Baker, D.H. (1997) Factors associated with utilization of the calcium salt of methionine hydroxy analogue by the young chick. Poultry Science 54: 584–591.Google Scholar
Kavanagh, F. (ed.) (1997) Analytical Microbiology. Academic Press, Inc., New York, NY. 707 pp.Google Scholar
Kelleher, B.P., Leahy, J.J., Henihan, A.M., O'dwyer, T.F., Sutton, D. and Leahy, M.J. (1997) Advances in poultry litter disposal technology – a review. Bioresource Technology 83: 27–36.Google Scholar
Kim, W.K., Anderson, R.C., Ratliff, A.L., Nisbet, D.J. and Ricke, S.C. (1997) Growth inhibition by nitrocompounds of selected uric acid-utilizing microorganisms isolated from poultry manure. Journal of Environmental Science and Health Part B, 41: 97–107.CrossRefGoogle Scholar
Kirchmann, H. and Witter, E. (1997) Ammonia volatilization during aerobic and anaerobic manure decomposition. Plant and Soil 115: 35–41.Google Scholar
Klasing, K.C. (1997) Poultry nutrition: A comparative approach. Journal of Applied Poultry Research 14: 426–436.Google Scholar
Koenig, K.M., Rode, L.M., Knight, C.D. and Mccullough, P.R. (1997) Ruminal escape, gastrointestinal absorption, and response of serum methionine to supplementation of liquid methionine hydroxy analogue in dairy cows. Journal of Dairy Science 82: 355–361.CrossRefGoogle Scholar
Kuenzel, W.J., Beck, M.M. and Teruyama, R. (1997) Neural sites and pathways regulating food intake in birds: A comparative analysis to mammalian systems. Journal of Experimental Zoology 283: 348–364.3.0.CO;2-5>CrossRefGoogle Scholar
Latshaw, J.D. (1997) Nutrition – mechanisms of immunosuppression. Veterinary Immunology and Immunopathology 30: 111–120.Google Scholar
Leeson, S., Summers, J.D. and Scott, M.L. (1997) Proteins and amino acids. In: Nutrition of the Chicken, 4th Edition. Leeson, s. and Summers, J.D eds. University Books, Guelph, Ontario, Canada. pp. 101–170.Google Scholar
Lehninger, A.L., Nelson, D.L. and Cox, M.M. (1997) Amino acid oxidation and the production of urea. In: Principles of Biochemistry. Neal, v., 2nd ed., Worth Publishers Inc., New York, NY. pp. 507–541.Google Scholar
Lewis, D. and D'mello, J.P.F. (1997) Growth and dietary amino acid balance. In: Growth and Development of Mammals. Lodge, G.A. and Lamming, G.E., ed. Butterworths, London, UK.Google Scholar
Lundquist, R.G., Stern, M.D., Otterby, D.E. and Linn, J.G. (1997) Influence of methionine hydroxy analogue and DL-methionine on rumen protozoa and volatile fatty acids. Journal of Dairy Science 68: 3055–3058.CrossRefGoogle Scholar
Mcnab, J.M. (1997) Chapter 9 Amino acid digestibility and availability studies with poultry. In: Amino Acids in Farm Animal Nutrition, D'mello, J.P.F ed., CAB International, Wallingford, UK. pp. 185–203.Google Scholar
Merrill, L. and Halverson, L.J. (1997) Seasonal variation in microbial communities and organic malodor indicator compound concentrations in various types of swine manure storage systems. Journal of Environmental Quality 31: 2074–2085.Google Scholar
Miles, D.M., Branton, S.L. and Lott, B.D. (1997) Atmospheric ammonia is detrimental to the performance of modern commercial broilers. Poultry Science 83: 1650–1654.CrossRefGoogle Scholar
Moore, P.A. Jr. (1997) Best management practices for poultry manure utilization that enhance agricultural productivity and reduce pollution. In: Animal Waste Utilization:Effective Use of Manure as a Soil Resource. Hatfield, J.L and Stewart, eds. Ann Arbor Press, Chelsea, MI. Pages 89–123.CrossRefGoogle Scholar
Nagaraja, K.V., Emery, D.A., Jordan, K.A., Newman, J.A. and Pomeroy, B.S. (1997) Scanning electron microscopic studies of adverse effects of ammonia on tracheal tissues of turkeys. American Journal of Veterinarian Research 44: 1530–1536.Google Scholar
Nagaraja, K.V., Emery, D.A., Jordan, K.A., Sivanandan, V., Newman, J.A. and Pomeroy, B.S. (1997) Effect of ammonia on the quantitative clearance of Escherichia coli from lungs, air sacs, and livers of turkeys aerosol vaccinated against Escherichia coli. American Journal of Veterinarian Research 45: 392–395.Google Scholar
Nahm, K.H. (1997) A strategy to solve environmental concerns caused by poultry production. World's Poultry Science Journal 56: 379–388.CrossRefGoogle Scholar
Naylor, R., Steinfeld, H., Falcon, W., Galloway, J., Smil, V.Bradford, E., Alder, J. and Mooney, H. (1997) Losing the links between livestock and land. Science 310: 1621–1622.CrossRefGoogle Scholar
Nicholson, F.A., Chambers, B.J. and Walker, A.W. (1997) Ammonia emissions from broiler litter and laying hen manure management systems. Biosystems Engineering 89: 175–185.CrossRefGoogle Scholar
O'neill, D.H. and Phillips, V.R. (1997) A review of the control of odour nuisance from livestock buildings: Part 3, Properties of the odorous substances, which have been identified in livestock wastes or in the air around them. Journal of Agriculture Engineering Research 53: 23–50.Google Scholar
Pack, M., Hoehler, D. and Lemme, A. (1997) Chapter 25 Economic assessment of amino acid responses in growing poultry. In Amino Acids in Animal Nutrition, 2nd Edition. D'mello, J.P.F. ed. CAB International, Wallingford, UK. Pages 459–483.Google Scholar
Paik, I.K. (1997) Nutritional management for environmental friendly animal production. Asian-Australian Journal of Animal Science 13: 302–314.Google Scholar
Patterson, J.A. and Kung, L. Jr. (1997) Metabolism of DL-methionine and methionine analogues by rumen microorganisms. Journal of Dairy Science 71: 3292–3301.CrossRefGoogle Scholar
Patterson, P.H. and Lorenz, E.S. (1997) Manure nutrient production from commercial White Leghorn hens. Journal of Applied Poultry Research 5: 260–268.CrossRefGoogle Scholar
Patterson, P.H., Lorenz, E.S., Weaver, W.D. Jr. and Schwartz, J.H. (1997) Litter production and nutrients from commercial broiler chickens. Journal of Applied Poultry Research 7: 247–252.Google Scholar
Payne, J.W. and Tuffnell, J.M. (1997) Section 4.9. Assays for amino acids, peptides and proteins. In: Microorganisms and Nitrogen Sources. Payne, J.W ed. John Wiley & Sons, New York, NY. pp. 727–765.Google Scholar
Pesti, G.M., Benevenga, N.J., Harper, A.E. and Sunde, M.L. (1997) The effects of high dietary protein and nitrogen levels on the preformed methyl group requirement and methionine-induced growth depression in chicks. Poultry Science 60: 425–432.Google Scholar
Potter, L.M. and Shelton, J.R. (1997) Protein, methionine, lysine, and a fermentation residue as variables in diets of young turkeys. Poultry Science 55: 1535–1543.CrossRefGoogle Scholar
Powers, W. (1997) Odor mechanisms and mitigation. In: 2002 National Poultry Waste Management Symposium. Pages 11–17.Google Scholar
Pullen, D.L., Palmquist, D.L. and Emery, R.S. (1997) Effect on days of lactation and methionine hydroxy analogue on incorporation of plasma fatty acids into plasma triglycerides. Journal of Dairy Science 72: 49–58.CrossRefGoogle Scholar
Rader, J.I., Weaver, C.M. and Angyal, G. (1997) Use of a microbiological assay with tri-enzyme extraction for measurement of pre-fortification levels of folates in enriched cereal-grain products. Food Chemistry 62: 451–465.CrossRefGoogle Scholar
Rader, J.I., Weaver, C.M. and Angyal, G. (1997) Advances in the analysis of folates in foods. Food Test Analysis 5: 14, 16, 18–19, 31, 40.Google Scholar
Rama Rao, S.V., Praharaj, N.K., Reddy, M.R. and Panda, A.K. (1997) Interaction between genotype and dietary concentrations of methionine for immune function in commercial broilers. British Poultry Science 44: 104–112.CrossRefGoogle Scholar
Ravindran, V. and Bryden, W.L. (1997) Amino acid availability in poultry - in vitro and in vivo measurements. Australian Journal of Agriculture Research 50: 889–908.Google Scholar
Ravindran, V. and Hendriks, W.H. (1997) Recovery and composition of endogenous protein collected at the terminal ileum as influenced by the age of broiler chickens. Australian Journal of Agriculture Research 55: 705–709.CrossRefGoogle Scholar
Rayudu, G.V.N., Kadirvel, R., Vohra, P. and Kratzer, F.H. (1997) Toxicity of tannic acid and its metabolites for chickens. Poultry Science 49: 957–960.Google Scholar
Reece, F.N., Lott, B.D. and Deaton, J.W. (1997) Ammonia in the atmosphere during brooding affects performance of broiler chickens. Poultry Science 59: 486–488.Google Scholar
Richardson, T., Pinckney, J. and Paerl, H. (1997) Responses of estuarine phytoplankton communities to nitrogen form and mixing using microcosm bioassays. Estuaries 24: 828–839.CrossRefGoogle Scholar
Rodehutscord, M., Kapocius, M., Timmler, R. and Dieckmann, A. (1997) Linear regression approach to study amino acid digestibility in broiler chickens. British Poultry Science 45: 85–92.CrossRefGoogle Scholar
Römer, A. and Abel, H. (1997) Effects of DL-methionine hydroxyanalogue (MHA) of DL-methionine (DLmet) on N-retention in broiler chickens and pigs. Animal Feed Science and Technology 81: 193–203.Google Scholar
Romoser, G.L., Wright, P.L. and Grainger, R.B. (1997) An evaluation of the L-methionine activity of the hydroxy analogue of methionine. Poultry Science 55: 1099–1103.CrossRefGoogle Scholar
Rostagno, H.S., Pupa, J.M.R. and Pack, M. (1997) Diet formulation for broilers based on total versus digestible amino acids. Journal of Applied Poultry Research 4: 293–299.CrossRefGoogle Scholar
Rotz, C.A. (1997) Management to reduce nitrogen losses in animal production. Journal of Animal Science 82: E119–E137.Google Scholar
Ryu, K.S., Pesti, G.M., Roberson, K.D., Edwards, H.M. Jr. and Eitenmiller, R.R. (1997) The folic acid requirements of starting broiler chicks fed diets based on practical ingredients 2. Interrelationships with dietary methionine. Poultry Science 74: 1456–1462.Google Scholar
Sapir, D.G. and Walser, M. (1997) Nitrogen sparing induced early in starvation by infusion of branchedchain ketoacids. Metabolism 26: 301–308.Google Scholar
Sapir, D.G., Owen, O.E., Pozefsky, T. and Walser, M. (1997) Nitrogen sparing induced by a mixture of essential amino acids given chiefly as their keto-analogues during prolonged fasting in obese subjects. Journal of Clinical Investigation 54: 974–980.CrossRefGoogle Scholar
Schexnailder, R. and Griffth, M. (1997) Liver fat and egg production of laying hens as influenced by choline and other nutrients. Poultry Science 52: 1188–1194.CrossRefGoogle Scholar
Smith, R.E. (1997) The utilization of L-methionine, DL-methionine, and methionine hydroxy analogue by the growing chick. Poultry Science 45: 571–576.CrossRefGoogle Scholar
Sommer, S.G. and Hutchings, N.J. (1997) Ammonia emission from field applied manure and its reduction – invited paper. European Journal of Agronomy 15: 1–15.Google Scholar
Summers, J.D. (1997) Reducing nitrogen excretion of the laying hen by feeding lower crude protein diets. Poultry Science 72: 1473–1478.CrossRefGoogle Scholar
Swain, B.K. and Johri, T.S. (1997) Effect of supplemental methionine, choline and their combinations on the performance and immune response of broilers. British Poultry Science 41: 83–88.Google Scholar
Tamura, T. (1997) Microbiological Assay of Folates. In: Folic Acid Metabolism in Health and Disease. Picciano, M.F., Stokstad, E.L.R., and Gregory, J.F. III, eds. Wiley-Liss, Inc. New York, NY. pp. 121–137.Google Scholar
Tipton, H.C., Dilworth, B.C. and Day, E.J. (1997) The relative biological value of DL-methionine and methionine hydroxy analogue in chick diets. Poultry Science 44: 987–992.CrossRefGoogle Scholar
Tsiagbe, V.K., Cook, M.E., Harper, A.E. and Sunde, M.L. (1987a) Efficacy of cysteine in replacing methionine in the immune responses of broiler chicks. Poultry Science 66: 1138–1146.Google Scholar
Tsiagbe, V.K., Cook, M.E.Harper, A.E. and Sunde, M.L. (1987b) Enhanced immune responses in broiler chicks fed methionine – supplemented diets. Poultry Science 66: 1147–1154.Google Scholar
Tuffnell, J.M. and Payne, J.W. (1997) A colorimetric enzyme assay using Escherichia coli to determine nutritionally available lysine in biological materials. Journal of Applied Bacteriology 58: 333–341.Google Scholar
Van Weerden, E.J., Bertram, H.L. and Schutte, J.B. (1997) Comparison of DL-methionine, DLmethionine-Na, DH-methionine hydroxy analogue-Ca, and DL-methionine hydroxy analogue free acid in broilers by using a crystalline amino acid diet. Poultry Science 61: 1125–1130.Google Scholar
Waldroup, P.W., Mabray, C.J., Blackman, J.R., Slagter, P.J., Short, R.J. and Johnson, Z.B. (1997) Effectiveness of the free acid of methionine hydroxy analogue as a methionine supplement in broiler diets. Poultry Science 60: 438–443.Google Scholar
Waldroup, P.W. and Hellwig, H.M. (1997) Methionine and total sulphur amino acid requirements influenced by stage of production. Journal of Applied Poultry Research 4: 283–292.CrossRefGoogle Scholar
Wallenius, R.W. and Whitchurch, R.E. (1997) Methionine hydroxy analogue or sulfate supplementation for high producing dairy cows. Journal of Dairy Science 58: 1314–1319.Google Scholar
Walser, M. (1997) Role of branched-chain ketoacids in protein metabolism. Kidney International 38: 595–604.CrossRefGoogle Scholar
Whitall, D., Castro, M. and Driscoll, C. (1997) Evaluation of management strategies for reducing nitrogen loadings to four US estuaries. Science of the Total Environment 333: 25–36.CrossRefGoogle Scholar
Williams, P.E.V. (1997) Poultry production and science: Future directions in nutrition. World's Poultry Science Journal 53: 33–48.Google Scholar
Zabala Díaz, I.B., Froelich, C.A. and Ricke, S.C. (1997) Adaptation of a methionine auxotroph Escherichia coli growth assay to microtiter plates for quantitating methionine. Journal of Rapid Methods and Automation in Microbiology 10: 217–229.Google Scholar
Zabala Díaz, I.B., Carreon, F.O.C., Ellis, W.C. and Ricke, S.C. (1997) Assessment of an Escherichia coli methionine auxotroph growth assay for quantifying crystalline methionine supplemented in poultry feeds. Journal of Rapid Methods and Automation in Microbiology 12: 155–167.Google Scholar
Zahn, J.A., Hatfield, J.L., Laird, D.A., Hart, T.T., Do, Y.S. and Dispirito, A.A. (1997) Functional classification of swine manure management systems based on effluent gas emission characteristics. Journal of Environmental Quality 30: 635–647.Google Scholar
Zebrowska, T. and Buraczewski, S. (1997) Methods for determination of amino acids bioavailability in pigs-review. Asian- Australian Journal of Animal Science 11: 620–633.Google Scholar