[Aguilar M., Hanigan M.D., Tucker H.A., Jones B.L., Garbade S.K., Mc Gilliard M.L., Stallings C.C., Knowlton K.F., James R.E.(2012). Cow and herd variation in milk urea nitrogen concentrations in lactating dairy cattle. J. Dairy Sci., 95: 7261–7268.]Search in Google Scholar
[AOAC(2010). Association of Official Analytical Chemists. Official methods of analysis, vol. 2, 18th edition, Arlington, VA, USA.]Search in Google Scholar
[Bauman D.E., Griinari J.M.(2003). Nutritional regulation of milk fat synthesis. Annul. Rev. Nutr., 23: 203–227.]Search in Google Scholar
[Boniface A.N., Murray R.M., Hogan J.P.(1986). Optimum level of ammonia in the rumen liquor of cattle fed tropical pasture hay. Proc. Aust. Soc. Anim. Prod., 16: 151–154.]Search in Google Scholar
[Coon R.E., Duffield T.F., De Vries T.J.(2019). Short communication: Risk of subacute ruminal acidosis affects the feed sorting behavior and milk production of early lactation cows. J. Dairy Sci., 102: 652–659.]Search in Google Scholar
[Dewanckele L., Jing L., Stefańska B., Vlaeminck B., Jeyanathan J., Van Straalen W.M., Koopmans A., Fievez V.(2019). Distinct blood and milk 18-carbon fatty acid proportions and buccal bacterial populations in dairy cows differing in reticulorumen pH response to dietary supplementation of rapidly fermentable carbohydrates. J. Dairy Sci., 102: 4025–4040.]Search in Google Scholar
[Duffield T., Plaizier J.C., Fairfield A., Bagg R., Vessie G., Dick P., Wilson J., Aramini J., Mc Bride B.W.(2004). Comparison of techniques for measurement of rumen pH in lactating dairy cows. J. Dairy Sci., 87: 59–66.]Search in Google Scholar
[Endres M.I., Stern M.D.(1993). Effects of pH and diets containing various levels of lignosulfonate-treated soybean meal on microbial fermentation in continuous culture J. Dairy Sci., 76: 177.]Search in Google Scholar
[Enemark J.M.D, Jørgensen R.J., Kristensen N.B.(2004). An evaluation of parameters for the detection of subclinical rumen acidosis in dairy herds. Vet. Res. Commun., 28: 687–709.]Search in Google Scholar
[Gao X., Oba M.(2014). Relationship of severity of subacute ruminal acidosis to rumen fermentation, chewing activities, sorting behavior, and milk production in lactating dairy cows fed a high-grain diet. J. Dairy Sci., 97: 3006–3016.]Search in Google Scholar
[Gao X., Oba M.(2015). Short communication: Noninvasive indicators to identify lactating dairy cows with a greater risk of subacute rumen acidosis. J. Dairy Sci., 98: 5735–5739.]Search in Google Scholar
[Garrett E.F., Pereira M.N., Nordlund K.V., Armentano L.E., Goodger W.J., Oetzel G.R.(1999). Diagnostic methods for the detection of subacute ruminal acidosis in dairy cows. J. Dairy Sci., 82: 1170–1178.]Search in Google Scholar
[Gozho G.N., Plaizier J.C., Krause D.O., Kennedy A.D., Wittenberg K.M.(2005). Subacute ruminal acidosis induces ruminal lipopolysaccharide endotoxin release and triggers an inflammatory response. J. Dairy Sci., 88: 1399–1403.]Search in Google Scholar
[Guo Y., Wang L., Zou Y., Xu X., Li S., Cao Z.(2013). Changes in ruminal fermentation, milk performance and milk fatty acid profile in dairy cows with subacute ruminal acidosis and its regulation with pelleted beet pulp. Arch. Anim. Nutr., 67: 433–447.]Search in Google Scholar
[Huhtanen P., Cabezas-Garcia E.H., Krizsan S.J., Shingfield K.J.(2015). Evaluation of between-cow variation in milk urea and rumen ammonia nitrogen concentrations and the association with nitrogen utilization and diet digestibility in lactating cows. J. Dairy Sci., 98: 3182–3196.]Search in Google Scholar
[Kleen J.L., Upgang L., Rehage J.(2013). Prevalence and consequences of subacute ruminal acidosis in German dairy herds. Acta Vet. Scand., 55: 48.]Search in Google Scholar
[Krause M.K., Otzel G.R.(2006). Understanding and preventing subacute ruminal acidosis in dairy herds. Anim. Feed Sci. Technol., 126: 215–236.]Search in Google Scholar
[Li S., Gozho G.N., Gakhar N., Khafipour E., Krause D.O., Plaizier J.C.(2012). Evaluation of diagnostic measures for subacute ruminal acidosis in dairy cows. Can. J. Anim. Sci., 92: 353–364.]Search in Google Scholar
[Liu H., Zhao K., Liu J.(2013). Effects of glucose availability on expression of the key genes involved in synthesis of milk fat, lactose and glucose metabolism in bovine mammary epithelial cells. PLoS One, 8: 66092.]Search in Google Scholar
[Lock A.L.(2010). Update on dietary and management effects on milk fat. Proc. 19th Annual Tri-State Dairy Nutrition Conference, 15: 26.]Search in Google Scholar
[Lu Z., Gui H., Yao L., Yan L., Martens H., Aschenbach J.R., Shen Z.(2015). Short-chain fatty acids and acidic pH upregulate UT-B, GPR41, and GPR4 in rumen epithelial cells of goats. Am. J. Physiol. Regul. Integr. Comp. Physiol., 308: R283–R293.]Search in Google Scholar
[Mertens D.R.(1997). Creating a system for meeting the fiber requirements of dairy cows. J. Dairy Sci., 80: 1463–1481.]Search in Google Scholar
[Nagata R., Kim Y.H., Ohkubo A., Kushibiki S., Ichijo T., Sato S.(2018). Effects of repeated subacute ruminal acidosis challenges on the adaptation of the rumen bacterial community in Holstein bulls. J. Dairy Sci., 101: 4424–4436.]Search in Google Scholar
[Nasrollahi S.M., Zali A., Ghorbani G.R., Moradi Shahrbabak M., Heydari Soltan Abadi M.(2017). Variability in the susceptibility to acidosis among high producing mid-lactation dairy cows is associated with rumen pH, fermentation, feed intake, sorting activity, and milk fat percentage. Anim. Feed Sci. Technol., 228: 72–82.]Search in Google Scholar
[Nasrollahi S.M., Zali A., Ghorbani G.R., Kahyani A., Beauchemin K.A.(2019). Blood metabolites, body reserves, and feed efficiency of high-producing dairy cows that varied in ruminal pH when fed a high-concentrate diet. J. Dairy Sci., 102: 672–677.]Search in Google Scholar
[Nordlund K.V., Garrett E.F.(1994). Rumenocentesis: A technique for collecting rumen fluid for the diagnosis of subacute rumen acidosis in dairy herds. Bovine Pr., 28: 109–112.]Search in Google Scholar
[Novozamsky I., van Eck R., Showenburg J.C.H., Walinga F.(1974). Total nitrogen determination in plant material by means of the indole-phenol blue method. Neth. J. Agr. Sci., 22: 3–5.]Search in Google Scholar
[NRC(2001). Nutrient Requirements of Dairy Cattle: Seventh Revised Edition.]Search in Google Scholar
[Plaizier J.C., Krause D.O., Gozho G.N., Mc Bride B.M.(2008). Subacute ruminal acidosis in dairy cows: The physiological causes, incidence and consequences. Vet. J., 176: 21–31.]Search in Google Scholar
[Powell J.M., Rotz C.A., Wattiaux M.A.(2014). Potential use of milk urea nitrogen to abate atmospheric nitrogen emissions from Wisconsin dairy farms. J. Environ. Qual., 43: 1169–1175.]Search in Google Scholar
[Russell J.B., Dombrowski D.(1980). Effect of pH on the efficiency of growth by pure cultures of rumen bacteria in continuous culture. Appl. Environ. Microbiol., 39: 604–610.]Search in Google Scholar
[Satter L.D., Slyter L.L.(1974). Effect of ammonia concentration of rumen microbial protein production in vitro. Br. J. Nutr., 32: 199–208.]Search in Google Scholar
[Schlau N., Guan L.L., Oba M.(2012). The relationship between rumen acidosis resistance expression of genes involved in regulation of intracellular pH butyrate metabolism of ruminal epithelial cells in steers. J. Dairy Sci., 95: 5866–5875.]Search in Google Scholar
[Siachos N., Panousis N., Arsenos G., Valergakis G.(2017). Investigation of milk urea nitrogen concentration and factors affecting its variation in Greek Holstein herds. J. Hellenic Vet. Med. Soc., 68: 423–432.]Search in Google Scholar
[Stefańska B., Nowak W., Komisarek J., Taciak M., Barszcz M., SkomiałJ.(2016). Prevalence and consequence of subacute ruminal acidosis in Polish dairy herds. J. Anim. Physiol. Anim. Nutr., 101: 694–702.]Search in Google Scholar
[Stefańska B., Pruszyńska-Oszmałek E., Szczepankiewicz D., Stajek K., Stefański P., Gehrke M., Nowak W.(2017). Relationship between pH of ruminal fluid during subacute ruminal acidosis and physiological response of the Polish Holstein-Friesian dairy cows. Pol. J. Vet. Sci., 20: 551–558.]Search in Google Scholar
[Stefańska B., Człapa W., Pruszyńska-Oszmałek E., Szczepankiewicz D., Fievez V., Komisarek J., Stajek K., Nowak W.(2018). Subacute ruminal acidosis affects fermentation and endotoxin concentration in the rumen, and relative expression of the CD14/ TLR4/MD2 genes involved in LPS systemic immune response in dairy cows. J. Dairy Sci., 101: 1297–1310.]Search in Google Scholar
[Stone W.C.(1999). The effect of subclinical acidosis on milk components. Proc. Cornell Nutrition Conference for Feed Manufacturers, Cornell Univ., Ithaca, NY, pp. 40–46.]Search in Google Scholar
[Stone W.C.(2004). Nutritional approaches to minimize subacute ruminal acidosis and laminitis in dairy cattle. J. Dairy Sci., 87: E13–E26.]Search in Google Scholar
[Zhao M., Bu D., Wang J., Zhou X., Zhu D., Zhang T., Niu J., Ma L.(2016). Milk production and composition responds to dietary neutral detergent fiber and starch ratio in dairy cows. Anim. Sci. J., 87: 756–766.]Search in Google Scholar
[Zhao K., Chen Y.H., Penner G.B., Oba M., Guan L.L.(2017). Transcriptome analysis of ruminal epithelia revealed potential regulatory mechanisms involved in host adaptation to gradual high fermentable dietary transition in beef cattle. BMC Genomics, 18: 976.]Search in Google Scholar
