Isaac Salfer

Arif, M. (Lead Author), Harsch, B. A., Matamoros, C., Salfer, I. J., Shepardson, R., & Harvatine, K. J. (Corresponding Author) (2025). The effects of saturated fatty acid supplements on plasma and milk concentration of fatty acid esters of hydroxy fatty acids (FAHFA) in dairy cows. JDS Communications, 6(6). doi: https://doi.org/10.3168/jdsc.2025-0813 

Ravelo, A. D., Salfer, I. J., & Caixeta, L. S. (2025). Graduate Student Literature Review: Contemporary perspectives and the use of omics techniques to improve our understanding of hyperketonemia in dairy cows. Journal of Dairy Science, 108(9), 10237-10247. doi: 10.3168/jds.2025-26542

Felton, J. C. (Lead Author), Dufour, E. I., Klejeski, M., Golombeski, A., Ziegler, B., Ziegler, D. M., & Salfer, I. J. (Corresponding Author) (2025). Assessment of lactoferrin supplementation in milk replacer on calf growth, feed efficiency and scouring incidence preweaning and postweaning. Journal of Dairy Research, 92, 32-38. doi: 10.1017/S0022029925000251

Ravelo, A. D. (Lead Author), Ruch, M., Suazo, M., Ferm, P., Su, R., Chen, C., . . . Caxieta, L. S. (Corresponding Author) (2025). Associations between hyperketonemia and the rumen metagenome and metabolome in Holstein cows during the first 2 weeks postpartum. Animal Microbiome, 7(1). doi: 10.1186/s42523-025-00430-y

Ravelo, A. D., Matamoros, C., Harvatine, K. J., & Salfer, I. J. (2025). Daily rhythms of glucose, insulin, and nonesterified fatty acid responses to an intravenous glucose tolerance test in dairy cows. Journal of Dairy Science, 108(5), 5462-5474. doi: 10.3168/jds.2024-26146

Salfer, I. J. (Lead Author), Bartell, P. A., & Harvatine, K. J. (Corresponding Author) (2025). The effects of the timing of abomasal infusion of fatty acids on the daily rhythms of milk synthesis and plasma hormones and metabolites in dairy cows. Journal of Dairy Science, 108(8), 8920-8933. doi: https://doi.org/10.3168/jds.2024-26215

Stypinski, J. D., Plumski, A. L., Ziegler, D. M., Hansen, W. P., Scott, M. F., & Salfer, I. J. (2025). Impacts of feeding milk replacer containing 20% or 24% protein and fat on growth and feed efficiency of beef × dairy crossbred calves. JDS Communications, 6(4), 502-507. doi: 10.3168/jdsc.2024-0726

Kamau, K., Thorpe, B., Meier, K. E., Endres, M. I., & Salfer, I. J. (2025). Comparisons of Feed Bunk Nutrient Consistency, Milk Production and Cow Behavior Between Herds Using Automated Milking Systems With or Without Automated Feeding Robots. Animals, 15(8), 1103. doi: 10.3390/ani15081103

Ravelo, A. D., Ruch, M., Salfer, I. J., & Caixeta, L. S. (2025). Comparison of glucose concentration measured in samples collected with different anticoagulants and analyzed using 2 glucose quantification methods. JDS Communications, 6(4), 616-619. doi: 10.3168/jdsc.2024-0730

Ravelo, A. D., Ruch, M., Salfer, I. J., & Caixeta, L. S. (2025). Comparison of glucose concentrations in samples frozen for varying durations and subjected to freeze-thawed cycles using 2 assay systems. JDS Communications, 6(4), 610-615. doi: 10.3168/jdsc.2024-0729

Ravelo, A. D., Dufour, E. I., Klejeski, M., Ziegler, B., Golombeski, A., & Salfer, I. J. (Corresponding Author) (2024). Impacts of feeding milk replacer supplemented with increasing concentrations of choline on feed intake, growth, and scouring incidence for 7 weeks preweaning and 1 week postweaning. JDS Communications, 5(6), 553-557. doi: 10.3168/jdsc.2024-0557

Salfer, Isaac J, Christine E Crawford, L Whitney Rottman, and Kevin J Harvatine. "The effects of feeding rations that differ in neutral detergent fiber and starch within a day on the daily pattern of key rumen microbial populations." JDS Communications 2.6 (2021): 334-339. <https://www.sciencedirect.com/science/article/pii/S2666910221001423> 

Andreen, D M, I J Salfer, Y Ying, D J Reinemann, and K J Harvatine. "Technical note: Method for improving precision of in-parlor milk meters and adjusting milk weights for stall effects." Journal of Dairy Science 103.6 (2020): 5162-5169. <http://dx.doi.org/10.3168/jds.2019-17479> 

Salfer, I J, P.A. Bartell, C.D. Dechow, and K.J. Harvatine. "Annual rhythms of milk synthesis in dairy herds in 4 regions of the United States and their relationships to environmental indicators." Journal of Dairy Science 103.4 (2020): 3696-3707. <http://dx.doi.org/10.3168/jds.2019-17362> 

Salfer, Isaac J. and Kevin J. Harvatine. "Night-restricted feeding of dairy cows modifies daily rhythms of feed intake, milk synthesis and plasma metabolites compared with day-restricted feeding." British Journal of Nutrition 123.8 (2020): 849-858. <http://dx.doi.org/10.1017/s0007114520000057>  

Chishti, Ghazanfar A., Isaac J. Salfer, Krum V. Nedelkov, and Tara L. Felix. "Impacts of Time-Fed Concentrate-Based Diets on Plasma Metabolites, Rumen Histology, and mRNA Expression of Hepatic Enzymes of Wethers." Animals 10.4 (2020): 686. <http://dx.doi.org/10.3390/ani10040686> 

Salfer, Isaac J., Samuel W. Fessenden, and Marshall D. Stern. "Evaluation of iso-α-acid and β-acid extracts from hops (Humulus lupulus L.) on fermentation by rumen microbes in dual-flow continuous culture fermenters." Animal Feed Science and Technology 260 (2020): 114385. <http://dx.doi.org/10.1016/j.anifeedsci.2019.114385> 

Chishti, G A, I J Salfer, F X Suarez-Mena, K J Harvatine, and A J Heinrichs. "Short communication: Relationships between physical form of oats in starter, rumen pH, and volatile fatty acids on hepatic expression of genes involved in metabolism and inflammation in dairy calves." Journal of Dairy Science 103.1 (2020): 439-446. <http://dx.doi.org/10.3168/jds.2019-16296> 

Salfer, I J, C D Dechow, and K J Harvatine. "Annual rhythms of milk and milk fat and protein production in dairy cattle in the United States." Journal of Dairy Science 102.1 (2019): 742-753. <http://dx.doi.org/10.3168/jds.2018-15040> 

Salfer, I J, M C Morelli, Y Ying, M S Allen, and K J Harvatine. "The effects of source and concentration of dietary fiber, starch, and fatty acids on the daily patterns of feed intake, rumination, and rumen pH in dairy cows." Journal of Dairy Science 101.12 (2018): 10911-10921. <http://dx.doi.org/10.3168/jds.2018-15071> 

Ruh, Kathryn E, Bradley J Heins, Isaac J Salfer, Robert D Gardner, and Marshall D Stern. "Comparison of warm season and cool season forages for dairy grazing systems in continuous culture." Translational Animal Science 2.2 (2018): 125-134. 

Salfer, I J, C Staley, H E Johnson, M J Sadowsky, and M D Stern. "Comparisons of bacterial and archaeal communities in the rumen and a dual-flow continuous culture fermentation system using amplicon sequencing." Journal of Animal Science 96.3 (2018): 1059-1072. <http://dx.doi.org/10.1093/jas/skx056> 

Huang, Z., P. E. Urriola, I. J. Salfer, M. D. Stern, and G. C. Shurson. "Differences in in vitro hydrolysis and fermentation among and within high-fiber ingredients using a modified three-step procedure in growing pigs." Journal of Animal Science 95.12 (2017): 5497-5506. <http://dx.doi.org/10.2527/jas2017.1907> 

Perttu, R. (Lead Author), Burns, S., Heins, B., & Salfer, I. (2025). Investigating Circadian Rhythms’ Impact on Animal Welfare in Precision Dairy Research for Lactating Cattle. Christchurch: 4th International Precision Dairy Farming Conference.

Rott, I. (Lead Author), Salfer, I., Heins, B. J., & Haagen, I. W. (Corresponding Author) (2025). 2641 Genetic parameters for birth weight, weaning weight, average daily gain, and serum total protein in Holstein calves Suppl. 1 ed., vol. 108, 381. Champaign, IL: Journal of Dairy Science. (American Dairy Science Association Annual Meeting, June 22-25, 2025, Louisville, KY) https://www.adsa.org/Portals/0/SiteContent/Docs/Meetings/2025ADSA/Abstracts_BOOK_2025_20250612-0820.pdf 

Heitman, S. (Lead Author), Suazo, M., Felton, J., Salfer, I., Gomez, A., & Heins, B. (Corresponding Author) (2025). 2748 Effects of Asparagopsis taxiformis on the rumen microbiome of dairy cows Suppl. 1 ed., vol. 108, 420. Champaign, IL: Journal of Dairy Science. (American Dairy Science Association Annual Meeting, June 22–25, 2025, Louisville, KY) https://www.adsa.org/Portals/0/SiteContent/Docs/Meetings/2025ADSA/Abstracts_BOOK_2025_20250612-0820.pdf 

Suazo, M. (Lead Author), Stypinski, J., Felton, J., & Salfer, I. (Corresponding Author) (2025). 2493 Impacts of altering rumen degradable to rumen undegradable protein ratio on milk yield and components, feed efficiency, and rumen metabolome in lactating dairy cows Suppl. 1 ed., vol. 108, 355. Champaign, IL: Journal of Dairy Science. (American Dairy Science Association Annual Meeting, June 22-25, 2025, Louisville, KY) https://www.adsa.org/Portals/0/SiteContent/Docs/Meetings/2025ADSA/Abstracts_BOOK_2025_20250612-0820.pdf 

Suazo, M. (Lead Author), Socha, M. T., Kleinschmit, D., & Salfer, I. (Corresponding Author) (2025). 2494 Effects of iso-acids and dietary protein concentration on total tract digestibility and urine purine derivatives of lactating dairy cows Suppl. 1 ed., vol. 108, 355. Champaign, IL: Journal of Dairy Science. (American Dairy Science Association Annual Meeting, June 22-25, 2025, Louisville, KY) https://www.adsa.org/Portals/0/SiteContent/Docs/Meetings/2025ADSA/Abstracts_BOOK_2025_20250612-0820.pdf 

Salfer, I., & Harvatine, K. J. (Corresponding Author) (2025). Husnain, M. (Ed.), 2201 Effects of oleic acid concentration in milk fat on the thermal properties of butter oil Suppl. 1 ed., vol. 108, 269. Champaign, IL: Journal of Dairy Science. (American Dairy Science Association Annual Meeting, June 22-25, 2025, Louisville, KY) https://www.adsa.org/Portals/0/SiteContent/Docs/Meetings/2025ADSA/Abstracts_BOOK_2025_20250612-0820.pdf 

Heins, B. J. (Corresponding Author), Haagen, I. W., & Salfer, I. J. (2025). 1154 Methane and carbon dioxide emissions of crossbreds of Holstein with Jersey, Montbéliarde, Normande, and Viking Red compared to purebred Holsteins Suppl. 1 ed., vol. 108, 24. Champaign, IL: Journal of Dairy Science. (American Dairy Science Association Annual Meeting, June 22-25, 2025, Louisville, KY) https://www.adsa.org/Portals/0/SiteContent/Docs/Meetings/2025ADSA/Abstracts_BOOK_2025_20250612-0820.pdf 

Dufour, E. (Lead Author), Plumski, A., Ziegler, B., Golombeski, A., & Salfer, I. (Corresponding Author) (2025). 2147 Performance and health of calves fed calf starters varying in physical form during the preweaning and early postweaning period Suppl. 1 ed., vol. 108, 249. Champaign, IL: Journal of Dairy Science. (American Dairy Science Association Annual Meeting, June 22-25, 2025, Louisville, KY) https://www.adsa.org/Portals/0/SiteContent/Docs/Meetings/2025ADSA/Abstracts_BOOK_2025_20250612-0820.pdf 

Dufour, E. (Lead Author), Plumski, A., Robbins, M., Peine, J., Ziegler, B., Golombeski, A., & Salfer, I. (Corresponding Author) (2025). 2148 Performance and health of post-weaned Holstein heifers offered a low-moisture block self-fed nutritional supplement with varying levels of menthol Suppl. 1 ed., vol. 108, 250. Champaign, IL: Journal of Dairy Science. (American Dairy Science Association Annual Meeting, June 22-25, 2025, Louisville, KY) https://www.adsa.org/Portals/0/SiteContent/Docs/Meetings/2025ADSA/Abstracts_BOOK_2025_20250612-0820.pdf 

Plumski, A. (Lead Author), Ziegler, D., Hansen, W. P., Scott, M. F., & Salfer, I. (Corresponding Author) (2025). 2150 Effects of medium chain fatty acid source in milk replacer on dairy calf performance and health for 7 weeks preweaning and 1-week postweaning Suppl. 1 ed., vol. 108, 250. Champaign, IL: Journal of Dairy Science. (American Dairy Science Association Annual Meeting, June 22-25, 2025, Louisville, KY) https://www.adsa.org/Portals/0/SiteContent/Docs/Meetings/2025ADSA/Abstracts_BOOK_2025_20250612-0820.pdf 

Dufour, E. (Lead Author), Plumski, A., Graugnard, D., Ziegler, B., Golombeski, A., & Salfer, I. (Corresponding Author) (2025). 2154 Performance and health of calves fed milk replacer with or without a mannan oligosaccharide and bacillus additive Suppl. 1 ed., vol. 108, 252. Champaign, IL: Journal of Dairy Science. (American Dairy Science Association Annual Meeting, June 22-25, 2025, Louisville, KY) https://www.adsa.org/Portals/0/SiteContent/Docs/Meetings/2025ADSA/Abstracts_BOOK_2025_20250612-0820.pdf 

Plumski, A. (Lead Author), Ziegler, D., Hansen, W. P., Scott, M. F., & Salfer, I. (Corresponding Author) (2025). 2155 Effects of increased concentrations of dried cheese byproduct in milk replacer on growth, feed intake, and scouring frequency of dairy calves for 7 weeks preweaning and 1-week postweaning Suppl. 1 ed., vol. 108, 252. Champaign, IL: Journal of Dairy Science. (American Dairy Science Association Annual Meeting, June 22-25, 2025, Louisville, KY) https://www.adsa.org/Portals/0/SiteContent/Docs/Meetings/2025ADSA/Abstracts_BOOK_2025_20250612-0820.pdf 

Wendt, S. (Lead Author), Sun, W., Hu, B., & Salfer, I. (Corresponding Author) (2025). 2224 Ruminal and intestinal dry matter and protein degradation of fermented and unfermented pennycress and camelina meals determined using the modified three-step procedure Suppl. 1 ed., vol. 108, 278. Champaign, IL: Journal of Dairy Science. (American Dairy Science Association Annual Meeting, June 22-25, 2025, Louisville, KY) https://www.adsa.org/Portals/0/SiteContent/Docs/Meetings/2025ADSA/Abstracts_BOOK_2025_20250612-0820.pdf 

Stypinski, J. (Lead Author), Heuschele, D. J., & Salfer, I. (Corresponding Author) (2025). 2104 Evaluation of 18 cover crops for in vitro methane production and digestibility Suppl. 1 ed., vol. 108, 233. Champaign, IL: Journal of Dairy Science. (American Dairy Science Association Annual Meeting, June 22-25, 2025, Louisville, KY https://www.adsa.org/Portals/0/SiteContent/Docs/Meetings/2025ADSA/Abstracts_BOOK_2025_20250612-0820.pdf 

Stypinski, J. (Lead Author), Traylor, S., Heuschele, D. J., & Salfer, I. (Corresponding Author) (2025). 2109 Evaluation of Megasphaera elsdenii NCIMB 41125 as an inoculant on the aerobic stability and fermentation characteristics of corn silage and alfalfa haylage Suppl. 1 ed., vol. 108, 234. Champaign, IL: Journal of Dairy Science. (American Dairy Science Association Annual Meeting, June 22-25, 2025, Louisville, KY) https://www.adsa.org/Portals/0/SiteContent/Docs/Meetings/2025ADSA/Abstracts_BOOK_2025_20250612-0820.pdf 

Ravelo, A. D. (Lead Author), Salfer, I. J., & Caxieta, L. S. (Corresponding Author) (2024). 1307 Associations between hyperketonemia and rumen metagenome and metabolome in dairy cows during the first two weeks postpartum Suppl. 1 ed., vol. 107, 68. Champaign, IL: Journal of Dairy Science. (American Dairy Science Association Annual Meeting, June 16-19, 2024, West Palm Beach, FL) https://www.adsa.org/Portals/0/SiteContent/Docs/Meetings/2024ADSA/Abstracts_BOOK_2024_FINAL.pdf 

Ravelo, A. D. (Lead Author), Stypinksi, J. D., Suazo, M., Ruch, M., Caxieta, L. S., & Salfer, I. J. (Corresponding Author) (2024). 2119 Daily rhythms of glucose tolerance following an abomasal bolus infusion of glucose Suppl. 1 ed., vol. 107, 222. Champaign, IL: Journal of Dairy Science. (American Dairy Science Association Annual Meeting, June 16-19, 2024, West Palm Beach, FL.) https://www.adsa.org/Portals/0/SiteContent/Docs/Meetings/2024ADSA/Abstracts_BOOK_2024_FINAL.pdf

Heins, B. J. (Lead Author), Sharpe, K. T., Felton, J., Salfer, I. J., Bell, E., & Honan, M. C. (2024). 2132 Bromide, iodine, bromoform, and fatty acids of milk from certified-organic dairy cows supplemented with Asparagopsis taxiformis Suppl. 1 ed., vol. 107, 226. Champaign, IL: Journal of Dairy Science. (American Dairy Science Association Annual Meeting, June 16-19, 2024, West Palm Beach, FL) https://www.adsa.org/Portals/0/SiteContent/Docs/Meetings/2024ADSA/Abstracts_BOOK_2024_FINAL.pdf

Dufour, E. (Lead Author), Plumski, A., Ziegler, B., Golombeski, A., & Salfer, I. (Corresponding Author) (2024). 2159 Performance and health of calves fed corn and pellet starters with the inclusion of oats or a fiber pellet Suppl. 1 ed., vol. 107, 237. Champaign, IL: Journal of Dairy Science. (American Dairy Science Association Annual Meeting, June 16-19, 2024, West Palm Beach, FL) https://www.adsa.org/Portals/0/SiteContent/Docs/Meetings/2024ADSA/Abstracts_BOOK_2024_FINAL.pdf

Heins, B. J. (Lead Author), Sharpe, K. T., Felton, J., Salfer, I., Bell, E., & Honan, M. (2024). 2400 Methane emissions, production, and rumination of certified-organic dairy cows supplemented with Asparagopsis taxiformis Suppl. 1 ed., vol. 107, 319. Champaign, IL: Journal of Dairy Science. (American Dairy Science Association Annual Meeting, June 16-19, 2024, West Palm Beach, FL) 

Stypinski, J. (Lead Author), Dufour, E., Plumski, A., Robbins, M., Peine, J., Golombeski, A., . . . Salfer, I. (Corresponding Author) (2024). 2426 Performance and health of post-weaned Holstein heifers offered a low-moisture block self-fed nutritional supplement with or without menthol Suppl. 1 ed., vol. 107, 329. Champaign, IL: Journal of Dairy Science. (American Dairy Science Association Annual Meeting, June 16-19, 2024, West Palm Beach, FL) https://www.adsa.org/Portals/0/SiteContent/Docs/Meetings/2024ADSA/Abstracts_BOOK_2024_FINAL.pdf

Suazo, M. (Lead Author), Plumski, A., Ziegler, D., Hansen, B., Scott, M., & Salfer, I. (Corresponding Author) (2024). 2427 Health and performance of Holstein dairy calves fed titrated levels of a cheese ingredient in milk replacer Suppl. 1 ed., vol. 107, 329. Champaign, IL: Journal of Dairy Science. (American Dairy Science Association Annual Meeting, June 16-19, 2024, West Palm Beach, FL) https://www.adsa.org/Portals/0/SiteContent/Docs/Meetings/2024ADSA/Abstracts_BOOK_2024_FINAL.pdf

Heins, B. J. (Lead Author), Salfer, I. J., & Haagen, I. W. (2024). 2648 Methane emissions of crossbreds of Holstein with Jersey, Montbéliarde, Normande, and Viking Red compared to pure Holsteins in a pasture production system Suppl. 1 ed., vol. 107, 407. Champaign, IL: Journal of Dairy Science. (American Dairy Science Association Annual Meeting, June 16-19, 2024, West Palm Beach, FL)

Stypinski, J. (Lead Author), Plumski, A., Ziegler, D., Hansen, W., Scott, M., & Salfer, I. (Corresponding Author) (2024). 2711 Health and performance of beef x dairy calves fed milk replacers of different fat levels and timing of varying protein sources Suppl. 1 ed., vol. 107, 430. Champaign, IL: Journal of Dairy Science. (American Dairy Science Association Annual Meeting, June 16-19, 2024, West Palm Beach, FL)
https://www.adsa.org/Portals/0/SiteContent/Docs/Meetings/2024ADSA/Abstracts_BOOK_2024_FINAL.pdf

Stypinski, J. (Lead Author), Heuschele, D. J., & Salfer, I. J. (Corresponding Author) (2024). 2744 Pure plant secondary metabolites for impacts on in vitro methane production Suppl. 1 ed., vol. 107, 440. Champaign, IL: Journal of Dairy Science. (American Dairy Science Association Annual Meeting, June 16-19, 2024, West Palm Beach, FL) https://www.adsa.org/Portals/0/SiteContent/Docs/Meetings/2024ADSA/Abstracts_BOOK_2024_FINAL.pdf

Ravelo, A. D. (Lead Author), Ruch, M., Salfer, I. J., & Caxieta, L. S. (Corresponding Author) (2024). 2528 Comparisons of glucose concentration measurements using different methods and glucose stability over time and after freeze-thaw cycles. Suppl. 1 ed., vol. 107, 369. Champaign, IL: Journal of Dairy Science. (American Dairy Science Association Annual Meeting, June 16-19, 2024, West Palm Beach, FL) https://www.adsa.org/Portals/0/SiteContent/Docs/Meetings/2024ADSA/Abstracts_BOOK_2024_FINAL.pdf

Suazo, M., M. Socha, D. Kleinschmit, and I. Salfer. 2023. Effects of branched-chain volatile fatty acids and dietary protein concentration on milk production, feed intake, and blood metabolites in dairy cows. American Dairy Science Association Annual Meeting. June 25-28, Ottawa, ON, CAN. 

Jacobson, E., E. Shepley, W. Weber, G. Cramer, B. Crooker, and I. Salfer. 2023. Effect of Holstein genotype on lying time and motion index, feed intake, and milk production. American Dairy Science Association Annual Meeting. June 25-28, Ottawa, ON, CAN. 

Scott, M., M. Klejeski, V. Dahle, W. Hansen, and I. Salfer. 2023. Effect of milk replacer nutrition on performance and health of beef x dairy calves. American Dairy Science Association Annual Meeting. June 25-28, Ottawa, ON, CAN. 

Dufour, E., M. Klejeski, B. Zeigler, A. Golombeski, and I. Salfer. 2023. Performance and Health of Calves Fed Milk Replacer Supplemented with Increasing Levels of Choline from Birth to 8 Weeks of Age. American Dairy Science Association Annual Meeting. June 25-28, Ottawa, ON, CAN. 

Dufour, E., M. Klejeski, B. Zeigler, A. Golombeski, and I. Salfer. 2023. Performance and Health of Calves Fed Texturized Calf Starter with Oats or an Oat Alternative from Birth to 8 Weeks of Age. American Dairy Science Association Annual Meeting.  June 25-28, Ottawa, ON, CAN.

Dufour, K., M. Klejeski, D. Zeigler, B. Zeigler, M. Scott, A. Golombeski, and I. Salfer. 2022. Performance and Health of Calves Fed Milk Replacer Supplemented with Varying Levels of Lactoferrin from Birth to 8 Weeks of Age. June 19-22, Kansas City, MO.

Kamau, K., B. Thorpe, K. Meier, M. Endres and I. Salfer. 2022. Effects of Automated Feeding Systems on Cow Performance and TMR Consistency. June 19-22, Kansas City, MO.

Ravelo, A.D., D.M. Moreira, M. Ruch, E. Shepley, I. Salfer and L.S. Caixeta. 2022. The association between hyperketonemia and blood and rumen parameters in the first two weeks postpartum. June 19-22, Kansas City, MO

Kamau, Kevin, Rebecca Bomberger, Kevin Harvatine, and Isaac Salfer. The impact of season on daily rhythms of body temperature and milk synthesis. Journal of Dairy Science.

Salfer, Isaac, Cesar Matamoros, and Kevin Harvatine. Glucose tolerance appears to follow a daily rhythm in dairy cows. Vol. 103, Suppl. 1. 2020: 148. 

Sanchez, William, Katrina Johnson, Kevin Harvatine, and Isaac Salfer. Annual rhythms of feed intake and milk production in the western United States and relationships to management strategies. 2020. 

Matamoros, C I, Brian A Harsch, Isaac J Salfer, Richard P Shepardson, Greg C Shearer, and Kevin J Harvatine. Characterization of fatty acid esters of hydroxy fatty acids, a novel class of bioactive lipids, in milk fat of cows supplemented with stearic and palmitic acid. Vol. 103, Suppl. 1. 2020: 65. 

Matamoros, Cesar, Isaac Salfer, and Kevin Harvatine. Effect of acetate absorption on the daily rhythm of milk synthesis and plasma hormones and metabolites in dairy cows. Vol. 103, Suppl. 1. 2020: 37. 

Salfer, Isaac J and Kevin J Harvatine. Effect of fatty acid absorption on the daily rhythms of milk synthesis and plasma hormones and metabolites in dairy cows. 2019: 105. 

Salfer, Isaac J, Cesar I Matamoros, Rebecca A Bomberger, and Kevin J Harvatine. Effect of protein absorption on the daily rhythms of milk synthesis and plasma hormones and metabolites in dairy cows. 2019: 105. 

Chishti, A G, I J Salfer, F X Suarez-Mena, and A J Heinrichs. Effect of Age and Physical form of oat within calf starter on Hepatic Enzyme Expression in Pre-Weaning Dairy Calves. 2018. 

Salfer, Isaac J. and Kevin J. Harvatine. The effect of night restricted feeding on the molecular circadian clock of the mammary gland. Vol. 101, Suppl. 2. Journal of Dairy Science, 2018: 405. 

Andreen, D M, I J Salfer, and Y Ying. Method for calibrating parlor milk meters and adjusting milk weights for stall effects. Vol. 101, Suppl. 2. J. Dairy Sci, 2018: 268. 

Andreen, D M, I J Salfer, Y Ying, and K J Harvatine. Method for adjusting milk weight values for stall variability in parlors with integrated milk meters. 2018. 

Ruh, K E, B J Heins, I J Salfer, R Gardener, and M D Stern. Dual flow continuous culture fermentation of organic BMR sorghum-sudangrass and teff grass to determine digestibility of forages in an organic dairy grazing system. 2017. 

Salfer, I J, C E Crawford, L W Rottman, Y Ying, and K Harvatine. The effects of feeding rations that differ in neutral detergent fiber and starch within a day on the daily pattern of selected rumen microbial populations. 2017. 

Salfer, I J, C D Dechow, and K J Harvatine. The effects of US region on the annual rhythms of milk yield and fat and protein concentration and yield of dairy cattle at the herd level. 2017. 

Salfer, I. J., C. D. Dechow, and K. J. Harvatine. Annual rhythms of milk, fat, and protein production in U.S. dairy cattle. Vol. 94, suppl_5. Journal of Animal Science, 2016: 792-792. <http://dx.doi.org/10.2527/jam2016-1626> 

Salfer, I. J., H. E. Johnson, and M. D. Stern. Comparisons of microbial populations found in the rumen and in a dual-flow continuous culture fermentation system using high-throughput 16S amplicon sequencing. Vol. 94, suppl_5. Journal of Animal Science, 2016: 789-789. <http://dx.doi.org/10.2527/jam2016-1621> 

Salfer, I. J., J. Y. Ying, and K. J. Harvatine. The timing of feed availability entrains the circadian rhythm of milk synthesis in dairy cattle. Vol. 94, suppl_5. Journal of Animal Science, 2016: 734-734. <http://dx.doi.org/10.2527/jam2016-1512> 

Larson, H E, I Shinzato, M Miura, S W Fessenden, I J Salfer, and M D Stern. Evaluation of three rumen-protected Lysine sources produced in two different batches using a modified three-step in vitro procedure. Vol. 93, Suppl s3. J. Anim. Sci., 2015: 157. 

Salfer, I J, S W Fessenden, and M D Stern. Response to Iso-alpha acids from Humulus lupulus (hops) extract on fermentation by rumen microbes in continuous culture fermenters. Vol. 93, Suppl. s3. J. Anim. Sci., 2015: 155-156. 

Fessenden, S W, I J Salfer, and M D Stern. Effects of beta-extract of Humulus lupulus (hops) on fermentation by rumen microbes in continuous culture. Vol. 92, E-Suppl. 2. J. Anim. Sci., 2014: 856. 

Huang, Z, I J Salfer, P E Urriola, M D Stern, and G C Shurson. Evaluation of in vitro dry matter digestibility (IVDMD) of high fiber feed ingredients for monogastrics. Vol. 92, Suppl. 2. J. Anim. Sci., 2014: 183. 

Salfer, Isaac J. "Improving milk production with natural circadian rhythms." Dairy Star. Vol. 23, 3rd ed. 2021: 28. <https://issuu.com/dairystar/docs/3-27-21-1star>  [Non-Refereed]

Salfer, Isaac. Are your cows seasonal workers? Hoard’s Dairyman, 2019. 

Salfer, Isaac J and Kevin J Harvatine. Are seasonal rhythms of milk production giving you the blues? Vol. 39. Farmshine, 2017: 14. 

Salfer, Isaac J and Kevin J Harvatine. "Seasonal variation in milk composition." 27th Annual Tri-State Dairy Nutrition Conference. 2017: 157--166. Apr. 16-18

Salfer, I. J., Penn State University Animal Science Departmental Seminar, "What role do circadian and seasonal rhythms play in regulating the feed efficiency of dairy cattle?," The Pennsylvania State University, University Park, Pennsylvania, United States. (November 14, 2025).

Salfer, I. J., Penn State Dairy Cattle Nutrition Workshop, "The role of forages in dairy cattle rations," Lancaster. (November 13, 2025).

Salfer, I. J., The Dairy Signal, "Recent Research Developments in the use of Probiotics for Dairy Cattle," Professional Dairy Producers of Wisconsin. (October 21, 2025).

Salfer, I. J., Hoard's Dairyman Webcast, "Roots to Rations: Alfalfa’s value from field to feedbunk," Forage Genetics International. (July 23, 2025).

Salfer, I. J., I-29 Moo University, "What Are the Potential Benefits of Automated Feeding Robots?." (July 16, 2025).

Salfer, I. J., China Dairy Expo, "Maximizing feed efficiency in high producing dairy cows," Diamond V, Xiamen City, China. (July 15, 2025).

Salfer, I. J., Four State Dairy Nutrition & Management Conference, "Maximizing feed efficiency in high producing dairy cows," LaCrosse, Wisconsin, United States. (June 12, 2025).

Salfer, I. J. (Speaker), Four State Dairy Nutrition & Management Conference, "Recent Research Developments in probiotics," LaCrosse, Wisconsin, United States. (June 11, 2025).

Seasonal Patterns of Milk Production. Ruminant Research Seminar – UMN Vet School. September 22, 2022. St. Paul, MN

Research Update: Feed Efficiency and Precision Feeding of Cows. Minnesota Nutrition Conference. September 22, 2022. Mankato, MN

Circadian Feeding Strategies to Improve Performance. Minnesota Nutrition Conference. September 23, 2021. Dubuque, IA.

Impact of Daily and Seasonal Rhythms on Nutrition and Milk Production. Carver County Dairy Expo. February 21, 2022. Norwood Young America, MN

Increasing Butterfat During Periods of High Feed Costs. Minnesota DHIA Monthly Meeting. February 16, 2022. Virtual

Salfer, I. J., (Speaker) "Milk components, nutrition, and circadian rhythms of cows," Minnesota Nutrition Conference, Mankato, Minnesota, United States. (September 23, 2021). Invited. Peer-reviewed/refereed.
URL: https://mnnutritionconf.umn.edu/program-agenda

Salfer, I. J., (Presenter) "Impact of circadian rhythms on metabolism and milk synthesis in dairy cows," Ruminant Research Seminar University of Minnesota College of Veterinary Medicine, St. Paul, Minnesota, United States. (May 10, 2021). Invited. Peer-reviewed/refereed.

Salfer, I. J., (Speaker) "Maximizing Feed Efficiency in Hight Producing Dairy Cows," Hubbard Dairy Forage Focus Meeting Hubbard Feeds, Virtual. (March 31, 2021). Invited. Peer-reviewed/refereed.

Salfer, I. J. "Considerations for dairy cow rations," Institut National Agronomique de Tunisie Dairy Program (Tunisian National Dairy Program) Northern Crops Institute, Brookings, South Dakota. (November 22, 2019). Invited.

Salfer, I. J. "How cows use nutrients to make milk?," Institut National Agronomique de Tunisie Dairy Program (Tunisian National Dairy Program). Northern Crops Institute, Brookings, South Dakota. (November 22, 2019). Invited.

Salfer, I. J. "Feeding cows for optimal protein synthesis in the mammary gland," Hoober Feeds Annual Dairy Seminar, New Holland, Pennsylvania. (February 6, 2019). Invited.

Salfer, I. J. "Understanding Forage Analysis," Penn State Dairy Cattle Nutrition Workshop, Hershey, Pennsylvania. (October 31, 2018). Invited. Oct. 31-Nov. 1, 2018.

Salfer, I. J. "What should I know about the seasonal pattern of milk composition?," Penn State Dairy Cattle Nutrition Workshop, Grantville, Pennsylvania. (November 15, 2017). Invited. Nov. 15-16, 2017

Salfer, I.J. 2021. Understanding the Impact of Daily Rhythms on Milk and Component Yield," Balchem’s Real Science Exchange. March 4.