Research Topics
| Alexander N HristovSummaryAffiliation: Pennsylvania State University Country: USA Publications
| Collaborators
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Detail Information
Publications
The effects of ruminally degraded protein on rumen fermentation and ammonia losses from manure in dairy cowsM 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...- Historic, pre-European settlement, and present-day contribution of wild ruminants to enteric methane emissions in the United StatesA 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... - Nitrogen losses from dairy manure estimated through nitrogen mass balance and chemical markersAlexander 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... - Effect of Saccharomyces cerevisiae fermentation product on ruminal fermentation and nutrient utilization in dairy cowsA N Hristov
Department of Dairy and Animal Science, Pennsylvania State University, University Park 16802, USA
J Dairy Sci 93:682-92. 2010.... - Variability in feed and total mixed ration neutral detergent fiber and crude protein analyses among commercial laboratoriesA 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... - Effect of lauric acid and coconut oil on ruminal fermentation, digestion, ammonia losses from manure, and milk fatty acid composition in lactating cowsA 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... - Effects of lauric and myristic acids on ruminal fermentation, production, and milk fatty acid composition in lactating dairy cowsA 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... - 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 cowsA N Hristov
Department of Dairy and Animal Science, Pennsylvania State University, University Park, Pennsylvania 16802, USA
J Dairy Sci 94:4057-74. 2011.... - Technical note: Contribution of ammonia emitted from livestock to atmospheric fine particulate matter (PM2.5) in the United StatesA 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%... - Effect of sodium laurate on ruminal fermentation and utilization of ruminal ammonia nitrogen for milk protein synthesis in dairy cowsA 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... - Effect of dietary crude protein level and degradability on ruminal fermentation and nitrogen utilization in lactating dairy cowsA 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... - Effect of dietary carbohydrate composition and availability on utilization of ruminal ammonia nitrogen for milk protein synthesis in dairy cowsA N Hristov
Department of Animal and Veterinary Science, University of Idaho, Moscow, ID 83844 2330, USA
J Dairy Sci 86:2416-27. 2003.... - Effect of dietary concentrate on rumen fermentation, digestibility, and nitrogen losses in dairy cowsM 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... - Effect of barley and its amylopectin content on ruminal fermentation and nitrogen utilization in lactating dairy cowsA 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... - A meta-analysis on the relationship between intake of nutrients and body weight with milk volume and milk protein yield in dairy cowsA 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... - A meta-analysis examining the relationship among dietary factors, dry matter intake, and milk and milk protein yield in dairy cowsA 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... - Effect of carbohydrate source on ammonia utilization in lactating dairy cowsA 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... - 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 cattleA N Hristov
Department of Animal and Veterinary Science, University of Idaho, Moscow, 83844 2330, USA
J Anim Sci 83:1312-21. 2005.... - Comparative characterization of reticular and duodenal digesta and possibilities of estimating microbial outflow from the rumen based on reticular sampling in dairy cowsA 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... - Fermentation characteristics and ruminal ciliate protozoal populations in cattle fed medium- or high-concentrate barley-based dietsA 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... - Efficiency of use of imported nitrogen, phosphorus, and potassium and potential for reducing phosphorus imports on Idaho dairy farmsA 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... - Peas can replace soybean meal and corn grain in dairy cow dietsM 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... - Efficiency of use of imported magnesium, sulfur, copper, and zinc on Idaho dairy farmsA 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... - Effect of inoculants on whole-crop barley silage fermentation and dry matter disappearance in situA 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... - 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 dietA 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... - Composition and digestive tract retention time of ruminal particles with functional specific gravity greater or less than 1.02A N Hristov
Department of Animal and Veterinary Science, University of Idaho, Moscow 83844 2330, USA
J Anim Sci 81:2639-48. 2003.... - Effect of a saponin-based surfactant and aging time on ruminal degradability of flaked corn grain dry matter and starchA 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...