Alexander N Hristov

Summary

Affiliation: Pennsylvania State University
Country: USA

Publications

  1. doi request reprint The effects of ruminally degraded protein on rumen fermentation and ammonia losses from manure in dairy cows
    M Agle
    Department of Animal and Veterinary Science, University of Idaho, Moscow 83844, USA
    J Dairy Sci 93:1625-37. 2010
  2. doi request reprint Effect of Origanum vulgare L. leaves on rumen fermentation, production, and milk fatty acid composition in lactating dairy cows
    A N Hristov
    Department of Dairy and Animal Science, The Pennsylvania State University, University Park, PA 16802, USA
    J Dairy Sci 96:1189-202. 2013
  3. doi request reprint Rumen bacterial, archaeal, and fungal diversity of dairy cows in response to ingestion of lauric or myristic acid
    A N Hristov
    Department of Dairy and Animal Science, Pennsylvania State University, University Park 16802, USA
    J Anim Sci 90:4449-57. 2012
  4. doi request reprint Historic, pre-European settlement, and present-day contribution of wild ruminants to enteric methane emissions in the United States
    A N Hristov
    Department of Dairy and Animal Science, Pennsylvania State University, University Park 16802, USA
    J Anim Sci 90:1371-5. 2012
  5. doi request reprint Nitrogen losses from dairy manure estimated through nitrogen mass balance and chemical markers
    Alexander N Hristov
    Department of Dairy and Animal Science, Pennsylvania State University, University Park, PA 16802, USA
    J Environ Qual 38:2438-48. 2009
  6. doi request reprint Effect of lauric acid and coconut oil on ruminal fermentation, digestion, ammonia losses from manure, and milk fatty acid composition in lactating cows
    A N Hristov
    Department of Animal and Veterinary Science, University of Idaho, Moscow, ID 83844, USA
    J Dairy Sci 92:5561-82. 2009
  7. doi request reprint Variability in feed and total mixed ration neutral detergent fiber and crude protein analyses among commercial laboratories
    A N Hristov
    Department of Animal and Veterinary Science, University of Idaho, Moscow, Idaho 83844, USA
    J Dairy Sci 93:5348-62. 2010
  8. doi request reprint Effects of lauric and myristic acids on ruminal fermentation, production, and milk fatty acid composition in lactating dairy cows
    A N Hristov
    Department of Dairy and Animal Science, The Pennsylvania State University, University Park, PA 16802, USA
    J Dairy Sci 94:382-95. 2011
  9. doi request reprint Technical note: Contribution of ammonia emitted from livestock to atmospheric fine particulate matter (PM2.5) in the United States
    A N Hristov
    Department of Dairy and Animal Science, Pennsylvania State University, University Park 16802, USA
    J Dairy Sci 94:3130-6. 2011
  10. doi request reprint Effect of Saccharomyces cerevisiae fermentation product on ruminal fermentation and nutrient utilization in dairy cows
    A N Hristov
    Department of Dairy and Animal Science, Pennsylvania State University, University Park 16802, USA
    J Dairy Sci 93:682-92. 2010

Collaborators

Detail Information

Publications29

  1. doi request reprint The effects of ruminally degraded protein on rumen fermentation and ammonia losses from manure in dairy cows
    M Agle
    Department of Animal and Veterinary Science, University of Idaho, Moscow 83844, USA
    J Dairy Sci 93:1625-37. 2010
    ..Overall, this study demonstrated that dairy diets with reduced CP and RDP concentrations will produce manure with lower ammonia-emitting potential without affecting cow performance, if metabolizable protein requirements are met...
  2. doi request reprint Effect of Origanum vulgare L. leaves on rumen fermentation, production, and milk fatty acid composition in lactating dairy cows
    A N Hristov
    Department of Dairy and Animal Science, The Pennsylvania State University, University Park, PA 16802, USA
    J Dairy Sci 96:1189-202. 2013
    ..Supplementation of the diet with OR linearly decreased DMI and increased feed efficiency. Oregano had no effects on milk fatty acid composition...
  3. doi request reprint Rumen bacterial, archaeal, and fungal diversity of dairy cows in response to ingestion of lauric or myristic acid
    A N Hristov
    Department of Dairy and Animal Science, Pennsylvania State University, University Park 16802, USA
    J Anim Sci 90:4449-57. 2012
    ..Collectively, results indicate that LA, either through antiprotozoal or direct antimicrobial effects, altered bacterial and archaeal populations in the rumen of dairy cows, but effects on fungal populations were not clear...
  4. doi request reprint Historic, pre-European settlement, and present-day contribution of wild ruminants to enteric methane emissions in the United States
    A N Hristov
    Department of Dairy and Animal Science, Pennsylvania State University, University Park 16802, USA
    J Anim Sci 90:1371-5. 2012
    ..Due to its population size (estimated at 25 million), the white-tailed deer is the most significant present-day wild ruminant contributor to enteric CH(4) emissions in the contiguous United States...
  5. doi request reprint Nitrogen losses from dairy manure estimated through nitrogen mass balance and chemical markers
    Alexander N Hristov
    Department of Dairy and Animal Science, Pennsylvania State University, University Park, PA 16802, USA
    J Environ Qual 38:2438-48. 2009
    ..Although promising, the latter approach needs to be further studied and verified in various experimental conditions and in the field...
  6. doi request reprint Effect of lauric acid and coconut oil on ruminal fermentation, digestion, ammonia losses from manure, and milk fatty acid composition in lactating cows
    A N Hristov
    Department of Animal and Veterinary Science, University of Idaho, Moscow, ID 83844, USA
    J Dairy Sci 92:5561-82. 2009
    ..Administration of LA and CO in the rumen also altered milk FA composition...
  7. doi request reprint Variability in feed and total mixed ration neutral detergent fiber and crude protein analyses among commercial laboratories
    A N Hristov
    Department of Animal and Veterinary Science, University of Idaho, Moscow, Idaho 83844, USA
    J Dairy Sci 93:5348-62. 2010
    ..Results of CP analysis were more consistent among laboratories, and variability in CP analysis of individual feeds or TMR was marginally acceptable...
  8. doi request reprint Effects of lauric and myristic acids on ruminal fermentation, production, and milk fatty acid composition in lactating dairy cows
    A N Hristov
    Department of Dairy and Animal Science, The Pennsylvania State University, University Park, PA 16802, USA
    J Dairy Sci 94:382-95. 2011
    ..Both LA and MA modified milk FA profile significantly...
  9. doi request reprint Technical note: Contribution of ammonia emitted from livestock to atmospheric fine particulate matter (PM2.5) in the United States
    A N Hristov
    Department of Dairy and Animal Science, Pennsylvania State University, University Park 16802, USA
    J Dairy Sci 94:3130-6. 2011
    ..5) concentrations. In certain areas (North Central, for example) and in cool weather, farm animal contribution to atmospheric PM(2.5) concentration may be as much as 20%...
  10. doi request reprint Effect of Saccharomyces cerevisiae fermentation product on ruminal fermentation and nutrient utilization in dairy cows
    A N Hristov
    Department of Dairy and Animal Science, Pennsylvania State University, University Park 16802, USA
    J Dairy Sci 93:682-92. 2010
    ....
  11. doi request reprint Effect of replacing solvent-extracted canola meal with high-oil traditional canola, high-oleic acid canola, or high-erucic acid rapeseed meals on rumen fermentation, digestibility, milk production, and milk fatty acid composition in lactating dairy cows
    A N Hristov
    Department of Dairy and Animal Science, Pennsylvania State University, University Park, Pennsylvania 16802, USA
    J Dairy Sci 94:4057-74. 2011
    ....
  12. ncbi request reprint Effect of dietary crude protein level and degradability on ruminal fermentation and nitrogen utilization in lactating dairy cows
    A N Hristov
    Department of Animal and Veterinary Science, University of Idaho, Moscow 83844 2330, USA
    J Anim Sci 82:3219-29. 2004
    ..At a similar MP supply, increased CP or RDP concentration of the diet would result in decreased efficiency of conversion of dietary N into milk protein and less efficient use of ruminal ammonia N for milk protein syntheses...
  13. ncbi request reprint Effect of sodium laurate on ruminal fermentation and utilization of ruminal ammonia nitrogen for milk protein synthesis in dairy cows
    A N Hristov
    Department of Animal and Veterinary Science, University of Idaho, Moscow 83844, USA
    J Dairy Sci 87:1820-31. 2004
    ..Treatment had no other significant effects on ruminal fermentation, total tract digestibility, or transfer of ruminal ammonia-15N into milk protein...
  14. ncbi request reprint Effect of dietary carbohydrate composition and availability on utilization of ruminal ammonia nitrogen for milk protein synthesis in dairy cows
    A N Hristov
    Department of Animal and Veterinary Science, University of Idaho, Moscow, ID 83844 2330, USA
    J Dairy Sci 86:2416-27. 2003
    ....
  15. ncbi request reprint Effect of barley and its amylopectin content on ruminal fermentation and nitrogen utilization in lactating dairy cows
    A E Foley
    Department of Animal and Veterinary Science, College of Agricultural and Life Sciences, University of Idaho, Moscow 83844, USA
    J Dairy Sci 89:4321-35. 2006
    ..The most likely reasons for these effects were the differences in starch characteristics and chemical composition, and perhaps the different response to processing between the 2 barleys...
  16. doi request reprint Effect of dietary concentrate on rumen fermentation, digestibility, and nitrogen losses in dairy cows
    M Agle
    Department of Animal and Veterinary Science, University of Idaho, Moscow 83844, USA
    J Dairy Sci 93:4211-22. 2010
    ..Increasing dietary concentrate was not a successful strategy to mitigate enteric methane production and ammonia emissions from manure...
  17. ncbi request reprint A meta-analysis examining the relationship among dietary factors, dry matter intake, and milk and milk protein yield in dairy cows
    A N Hristov
    Department of Animal and Veterinary Science, College of Agricultural and Life Sciences, University of Idaho, Moscow 83844, USA
    J Dairy Sci 87:2184-96. 2004
    ..Inclusion of stage of lactation substantially improved the MY models but did not affect model fits or residual structure for DMI and MPY...
  18. ncbi request reprint Effect of diets containing linoleic acid- or oleic acid-rich oils on ruminal fermentation and nutrient digestibility, and performance and fatty acid composition of adipose and muscle tissues of finishing cattle
    A N Hristov
    Department of Animal and Veterinary Science, University of Idaho, Moscow, 83844 2330, USA
    J Anim Sci 83:1312-21. 2005
    ....
  19. ncbi request reprint Effect of carbohydrate source on ammonia utilization in lactating dairy cows
    A N Hristov
    Department of Animal and Veterinary Science, University of Idaho, Moscow 83844 2330
    J Anim Sci 83:408-21. 2005
    ..Rapidly fermentable energy in the rumen decreased ammonia production and flux, but the overall efficiency of ammonia utilization for milk protein synthesis was only increased by enhancing ruminal microbial ammonia uptake...
  20. ncbi request reprint A meta-analysis on the relationship between intake of nutrients and body weight with milk volume and milk protein yield in dairy cows
    A N Hristov
    Department of Animal and Veterinary Science, College of Agricultural and Life Sciences, University of Idaho, Moscow 83844
    J Dairy Sci 88:2860-9. 2005
    ..These models were dominated by ruminally undegradable protein intake and included a number of energy-related intake variables. In most models, incorporating stage of lactation improved the model fit...
  21. ncbi request reprint Comparative characterization of reticular and duodenal digesta and possibilities of estimating microbial outflow from the rumen based on reticular sampling in dairy cows
    A N Hristov
    Department of Animal and Veterinary Science, University of Idaho, Moscow 83844 2330, USA
    J Anim Sci 85:2606-13. 2007
    ..These findings need to be confirmed in experiments with basal diets varying in structure and forage-to-concentrate ratios...
  22. ncbi request reprint Fermentation characteristics and ruminal ciliate protozoal populations in cattle fed medium- or high-concentrate barley-based diets
    A N Hristov
    Department of Animal and Veterinary Science, University of Idaho, Moscow 83844 2330, USA
    J Anim Sci 79:515-24. 2001
    ..constituted 97% of the total. These data demonstrate that a large population of Entodinium spp. can persist in the rumen of cattle fed high barley grain-based finishing diets...
  23. ncbi request reprint Efficiency of use of imported nitrogen, phosphorus, and potassium and potential for reducing phosphorus imports on Idaho dairy farms
    A N Hristov
    Department of Animal and Veterinary Science, University of Idaho, Moscow 83844, USA
    J Dairy Sci 89:3702-12. 2006
    ..This study demonstrated that in addition to exports with milk and manure, export of nutrients with forages produced on the farm (dairy F) is a major factor in reducing whole-farm N, P, and K surpluses...
  24. doi request reprint Peas can replace soybean meal and corn grain in dairy cow diets
    M Vander Pol
    Department of Animal and Veterinary Science, University of Idaho, Moscow, Idaho 83844, USA
    J Dairy Sci 91:698-703. 2008
    ..At this inclusion rate, no effects on milk yield or milk composition were observed...
  25. ncbi request reprint Effect of inoculants on whole-crop barley silage fermentation and dry matter disappearance in situ
    A N Hristov
    Department of Animal and Veterinary Science, University of Idaho, Moscow 83844 2330, USA
    J Anim Sci 80:510-6. 2002
    ..Although inoculants did not improve DM degradability of barley silage, lower terminal pH and increased concentrations of lactic acid may improve aerobic stability upon feed-out...
  26. ncbi request reprint Efficiency of use of imported magnesium, sulfur, copper, and zinc on Idaho dairy farms
    A N Hristov
    Department of Animal and Veterinary Science, University of Idaho, Moscow 83844, USA
    J Dairy Sci 90:3034-43. 2007
    ..The results from this study suggest that reduction in the concentration of dietary Mg, Cu, and Zn is potentially the most efficient way of reducing overall excretions and whole-farm surpluses of these minerals...
  27. ncbi request reprint Effect of a saponin-based surfactant and aging time on ruminal degradability of flaked corn grain dry matter and starch
    A N Hristov
    Department of Animal and Veterinary Science, University of Idaho, Moscow, ID, USA
    J Anim Sci 85:1459-66. 2007
    ..Because the rate of degradation was not affected by the surfactant, the increase in degradability was attributed mainly to increases in DM and starch solubility...
  28. ncbi request reprint In vitro effects of individual fatty acids on protozoal numbers and on fermentation products in ruminal fluid from cattle fed a high-concentrate, barley-based diet
    A N Hristov
    Department of Animal and Veterinary Science, University of Idaho, Moscow 83844 2330, USA
    J Anim Sci 82:2693-704. 2004
    ..These in vitro results suggest that long-chain unsaturated FA in combination with medium-chain saturated acids have the potential to decrease protozoal numbers and ruminal ammonia utilization in cattle fed high-grain diets...
  29. ncbi request reprint Composition and digestive tract retention time of ruminal particles with functional specific gravity greater or less than 1.02
    A N Hristov
    Department of Animal and Veterinary Science, University of Idaho, Moscow 83844 2330, USA
    J Anim Sci 81:2639-48. 2003
    ....