Indicators of dehydration in healthy 4- to 5-day-old dairy calves deprived of feed and water for 24 hours

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dc.citation.issue12
dc.citation.volume103
dc.contributor.authorKells NJ
dc.contributor.authorBeausoleil NJ
dc.contributor.authorJohnson CB
dc.contributor.authorChambers JP
dc.contributor.authorO'Connor C
dc.contributor.authorWebster J
dc.contributor.authorLaven R
dc.contributor.authorCogger N
dc.date.available2020-12
dc.date.available2020-08-09
dc.date.issued2020-12
dc.description.abstractOur objective was to identify practical indicators of calf dehydration that could be used in an industry context. Eleven healthy 4-d-old commercial dairy calves were fed 2 L of mixed colostrum, then deprived of food and water for 24 h. Total body water was determined in the fed state using the deuterium dilution method. Body weight, along with a range of behavioral and physiological variables, was recorded 1 h after feeding, then at 90-min intervals through to 24 h. Blood samples were collected at every second sampling to assess changes in plasma hemoglobin, hematocrit, and osmolality. Linear mixed-effects models were used to explore associations between hydration status (% body water) and outcome variables. All calves remained bright and alert with good suckling reflexes throughout the 24-h period. After 24 h, total body water had decreased by an average of 8.4% (standard error 1.18), consistent with mild to moderate dehydration. Skin tent return time, capillary refill time, and detectable enophthalmos were associated with hydration status. Calves with skin tent return times of 3 s or longer were 4.4 percentage points less hydrated than those with return times of less than 3 s. Similarly, a capillary refill time of 3 s or longer was associated with a 4.3 percentage point reduction in hydration compared with refill times of less than 3 s. Calves with detectable enophthalmos (≥1 mm) were 3.5 percentage points less hydrated than those without enophthalmos. The skin tent, capillary refill, and enophthalmos tests are all relatively simple to perform and, although requiring the calf to be briefly restrained, can easily be performed by a single operator. The outcome of these tests was relatively consistent, in that calves above the threshold in any test were 3.5 to 4.5% less hydrated than calves below the threshold. As such, these tests may be of practical utility to identify calves with mild to moderate dehydration in an industry setting.
dc.description.publication-statusPublished
dc.format.extent11820 - 11832
dc.identifierhttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000603029300024&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=c5bb3b2499afac691c2e3c1a83ef6fef
dc.identifier.citationJOURNAL OF DAIRY SCIENCE, 2020, 103 (12), pp. 11820 - 11832
dc.identifier.doi10.3168/jds.2020-18743
dc.identifier.eissn1525-3198
dc.identifier.elements-id435576
dc.identifier.harvestedMassey_Dark
dc.identifier.issn0022-0302
dc.identifier.urihttps://hdl.handle.net/10179/16500
dc.publisherElsevier BV for the American Dairy Science Association
dc.relation.isPartOfJOURNAL OF DAIRY SCIENCE
dc.subjectbobby calf
dc.subjectdehydration
dc.subjectskin tent
dc.subjectcapillary refill
dc.subjectenophthalmos
dc.subject.anzsrc0702 Animal Production
dc.subject.anzsrc0908 Food Sciences
dc.titleIndicators of dehydration in healthy 4- to 5-day-old dairy calves deprived of feed and water for 24 hours
dc.typeJournal article
pubs.notesNot known
pubs.organisational-group/Massey University
pubs.organisational-group/Massey University/College of Sciences
pubs.organisational-group/Massey University/College of Sciences/School of Veterinary Science
pubs.organisational-group/Massey University/Other
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