Acknowledgement
This work was supported by the Animal and Plant Quarantine Agency (Republic of Korea; No.F-1543071-2019-20-01).
References
- Animal welfare farm certification standards for dairy cattle [Internet]. Animal Protection Management System [cited 2021 Feb 4]. Available from: https://www.animal.go.kr/front/community/show.do?boardId=contents&seq=79&menuNo=3000000019
- Beauchemin KA. Invited review: Current perspectives on eating and rumination activity in dairy cows. J Dairy Sci 2018;101:4762-84. https://doi.org/10.3168/jds.2017-13706
- RDA (Rural Development Administration). Korean feeding standard for Dairy Cattle. 3rd ed. Jeonju, Korea: National Institute of Animal Science; 2017.
- Aschenbach JR, Penner GB, Stumpff F, Gabel G. Ruminant nutrition symposium: Role of fermentation acid absorption in the regulation of ruminal pH. J Anim Sci 2011;89:1092107. https://doi.org/10.2527/jas.2010-3301
- Son HI, Baek SG, Moon JY, Ahn EY, Lee HJ, Son YS. Effect of subacute ruminal acidosis on plasma concentrations of lipopolysaccharide in dairy cattle. J Korean Soc Grassl Forage Sci 2013;33:313-8. https://doi.org/10.5333/KGFS.2013.33.4.313
- OIE [Internet]. Terrestrial Animal Health Code Chapter 7.11. Animal welfare and dairy cattle production systems [cited 2021 Feb 4]. Available from: https://www.oie.int/index.php?id=169&L=0&htmfile=chapitre_aw_dairy_cattle.htm
- Castillo-Gonzalez AR, Burrola-Barraza ME, Dominguez-Viveros J, Chavez-Martinz A. Rumen microorganisms and fermentation. Arch Med Vet 2014;46:349-61. https://doi.org/10.4067/S0301-732X2014000300003
- AWA (Animal Welfare Approved by AGW standard) [Internet]. Dairy Cattle Standards [cited 2021 Feb 4]. Available from: https://agreenerworld.org/certifications/animal-welfare-approved/standards/dairy-cattle-and-calves-standards/
- Antanaitis R, Juozaitiene V, Rutkauskas A, Televicius M, Stasiuleviciute I. Reticulorumen temperature and pH as indicators of the likelihood of reproductive success. J Dairy Res 2018;85:23-6. https://doi.org/10.1017/S0022029918000018
- Stangaferro ML, Wijma R, Caixeta LS, Al-Abri MA, Giordano JO. Use of rumination and activity monitoring for the identification of dairy cows with health disorders: Part III. Metritis. J Dairy Sci 2016;99:7422-33. https://doi.org/10.3168/jds.2016-11352
- Elischer MF, Arceo ME, Karcher EL, Siegford JM. Validating the accuracy of activity and rumination monitor data from dairy cows housed in a pasture-based automatic milking system. J Dairy Sci 2013;96:6412-22. https://doi.org/10.3168/jds.2013-6790
- OIE. Animal Welfare and Dairy Cattle Production System. In Terrestrial Animal Health Code; Chapter 7.11. Paris, France: World Organization for Animal Health/OIE; 2015.
- Spigarelli C, Zuliani A, Battini M, Mattiello S, Bovolenta S. Welfare assessment on pasture: a review on animal-based measures for ruminants. Animals 2020;10:609. https://doi.org/10.3390/ani10040609
- Lee WS, Lee BS, Oh YK, et al. Effects of concentrate to roughage ratios on duration and frequencies of rumination and chewing in Hanwoo steers. J Anim Sci Technol 2004;46:5560. https://doi.org/10.5187/JAST.2004.46.1.055
- Schirmann K, von Keyserlingk MA, Weary DM, Veria DM, Heuwieser W. Validation of a system for monitoring rumination in dairy cows. J Dairy Sci 2009;92:6052-5. https://doi.org/10.3168/jds.2009-2361
- Soriani N, Trevisi E, Calamari L. Relationships between rumination time, metabolic conditions, and health status in dairy cows during the transition period. J Anim Sci 2012;90:4544-54. https://doi.org/10.2527/jas.2011-5064
- Jiang FG, Lin XY, Yan ZG, et al. Effect of dietary roughage level on chewing activity, ruminal pH, and saliva secretion in lactating Holstein cows. J Dariy Sci 2017;100:2660-71. https://doi.org/10.3168/jds.2016-11559
- Mao SY, Huo WJ, Zhu WY. Microbiome-metabolome analysis reveals unhealthy alterations in the composition and metabolism of ruminal microbiota with increasing dietary grain in a goat model. Environ Microbiol 2016;18:525-41. https://doi.org/10.1111/1462-2920.12724
- Krause KM, Combs DK, Beauchemin KA. Effects of forage particle size and grain fermentability in midlactation cows. II. Ruminal pH and chewing activity. J Dairy Sci 2002;85:1947-57. https://doi.org/10.3168/jds.S0022-0302(02)74271-9
- Pitt R, Pell A. Modeling ruminal pH fluctuations: interactions between meal frequency and digestion rate. J Dairy Sci 1997;80:2429-41. https://doi.org/10.3168/jds.S0022-0302(97)76195-2
- Desnoyers M, Duvaux-Ponter C, Rigalma K, Roussel S, Martin O, Giger-Reverdin S. Effect of concentrate percentage on ruminal pH and time-budget in dairy goats. Animal 2008;2:1802-8. https://doi.org/10.1017/S1751731108003157
- Keady TWJ, Mayne CS, Fitzpatrick DA, McCoy MA. Effect of concentrate feed level in late gestation on subsequent milk yield, milk composition, and fertility of dairy cows. J Dairy Sci 2001;84:1468-79. https://doi.org/10.3168/jds.S0022-0302(01)70180-4
- Jung SH, Jung YH, Choe C, et al. Reference intervals for blood metabolic profiles of Holstein cows in Korea. Korean J Vet Serv 2019;42:121-6. https://doi.org/10.7853/kjvs.2019.42.2.121
- Adewuyi AA, Gruys E, Van Eerdenburg FJCM. Non-esterified fatty acids (NEFA) in dairy cattle. A review. Vet Q 2005;27:117-26. https://doi.org/10.1080/01652176.2005.9695192
- Jozwik A, Strzalkowska N, Bagnicka E, et al. Relationship between milk yield, stage of lactation, and some blood serum metabolic parameters of dairy cows. Czech J Anim Sci 2012;57:353-60. https://doi.org/10.17221/6270-CJAS
- Mohebbi-Fani M, Nazifi S, Rowghani E, Bahrami S, Jamshidi O. Thyroid hormones and their correlations with serum glucose, beta hydroxybutyrate, nonesterified fatty acids, cholesterol, and lipoproteins of high-yielding dairy cows at different stages of lactation cycle. Comp Clin Pathol 2009;18:211-6. https://doi.org/10.1007/s00580-008-0782-7
- Lee BH, Nejad JG, Kim HS, Sung KI. Effect of forage feeding level on the milk production characteristics of Holstein lactating cows. J Korean Soc Grassl Forage Sci 2013;33:45-51. https://doi.org/10.5333/KGFS.2013.33.1.45
- De Vries A, Marcondes M. Overview of factors affecting productive lifespan of dairy cows. Animal 2020;14(S1):155-64. https://doi.org/10.1017/S1751731119003264