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Prevalence of subclinical ketosis in mainly pasture-grazed dairy cows in New Zealand in early lactation.
N Z Vet J. 2014 Jan; 62(1):30-7.NZ

Abstract

AIMS

The main aim of this study was to describe the prevalence of primary subclinical ketosis (SCK) in mainly pasture-grazed dairy cows in three dairy-farming regions of New Zealand 7-12, and 35-40 days post-calving. A second aim was to investigate herd- and cow-level factors associated with the prevalence of SCK.

METHODS

A cross-sectional longitudinal prevalence survey was undertaken in 1,620 dairy cows from 57 herds. A random sample of cows without disease in the prior 30 days were enrolled at one farm visit within 5 days of calving, and blood samples were collected 7 and 28 days later (7-12 and 35-40 days post-calving) for measurement of beta-hydroxy butyrate (BHBA) concentrations using an electronic cow-side meter. SCK was defined as blood BHBA concentration ≥1.4 mmol/L.

RESULTS

Mean cow-level prevalence of SCK varied with interval post-calving (16.8 and 3.2% at 7-12 days and 35-40 days post-calving, respectively) and age (13.0 and 13.1% of 2-year olds and ≥8-year olds, respectively, compared to 7.2% of 3-4-year-old cows). Mean herd-level prevalence of SCK was 14.3 (min 0, max 60.0)% and 2.6 (min 0, max 24.4)% at 7-12 days and 35-40 days post-calving, respectively, and was greater in Southland (13.3%) than Waikato and Canterbury herds (6.9 and 4.7%, respectively).

CONCLUSIONS

This is the first population-based report of the prevalence of SCK in New Zealand dairy herds and demonstrates that age and interval post-calving are important risk factors determining prevalence; and that there is wide variation in prevalence between herds.

CLINICAL RELEVANCE

Subclinical ketosis may be unrecognised but common in many New Zealand dairy cows in the first 2 weeks of lactation.

Authors+Show Affiliations

a Cognosco, Anexa Animal Health , PO Box 21, Morrinsville 3340 , NZ.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

23981014

Citation

Compton, C W R., et al. "Prevalence of Subclinical Ketosis in Mainly Pasture-grazed Dairy Cows in New Zealand in Early Lactation." New Zealand Veterinary Journal, vol. 62, no. 1, 2014, pp. 30-7.
Compton CW, McDougall S, Young L, et al. Prevalence of subclinical ketosis in mainly pasture-grazed dairy cows in New Zealand in early lactation. N Z Vet J. 2014;62(1):30-7.
Compton, C. W., McDougall, S., Young, L., & Bryan, M. A. (2014). Prevalence of subclinical ketosis in mainly pasture-grazed dairy cows in New Zealand in early lactation. New Zealand Veterinary Journal, 62(1), 30-7. https://doi.org/10.1080/00480169.2013.823829
Compton CW, et al. Prevalence of Subclinical Ketosis in Mainly Pasture-grazed Dairy Cows in New Zealand in Early Lactation. N Z Vet J. 2014;62(1):30-7. PubMed PMID: 23981014.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Prevalence of subclinical ketosis in mainly pasture-grazed dairy cows in New Zealand in early lactation. AU - Compton,C W R, AU - McDougall,S, AU - Young,L, AU - Bryan,M A, Y1 - 2013/08/28/ PY - 2013/8/29/entrez PY - 2013/8/29/pubmed PY - 2014/3/14/medline SP - 30 EP - 7 JF - New Zealand veterinary journal JO - N Z Vet J VL - 62 IS - 1 N2 - AIMS: The main aim of this study was to describe the prevalence of primary subclinical ketosis (SCK) in mainly pasture-grazed dairy cows in three dairy-farming regions of New Zealand 7-12, and 35-40 days post-calving. A second aim was to investigate herd- and cow-level factors associated with the prevalence of SCK. METHODS: A cross-sectional longitudinal prevalence survey was undertaken in 1,620 dairy cows from 57 herds. A random sample of cows without disease in the prior 30 days were enrolled at one farm visit within 5 days of calving, and blood samples were collected 7 and 28 days later (7-12 and 35-40 days post-calving) for measurement of beta-hydroxy butyrate (BHBA) concentrations using an electronic cow-side meter. SCK was defined as blood BHBA concentration ≥1.4 mmol/L. RESULTS: Mean cow-level prevalence of SCK varied with interval post-calving (16.8 and 3.2% at 7-12 days and 35-40 days post-calving, respectively) and age (13.0 and 13.1% of 2-year olds and ≥8-year olds, respectively, compared to 7.2% of 3-4-year-old cows). Mean herd-level prevalence of SCK was 14.3 (min 0, max 60.0)% and 2.6 (min 0, max 24.4)% at 7-12 days and 35-40 days post-calving, respectively, and was greater in Southland (13.3%) than Waikato and Canterbury herds (6.9 and 4.7%, respectively). CONCLUSIONS: This is the first population-based report of the prevalence of SCK in New Zealand dairy herds and demonstrates that age and interval post-calving are important risk factors determining prevalence; and that there is wide variation in prevalence between herds. CLINICAL RELEVANCE: Subclinical ketosis may be unrecognised but common in many New Zealand dairy cows in the first 2 weeks of lactation. SN - 0048-0169 UR - https://www.unboundmedicine.com/medline/citation/23981014/Prevalence_of_subclinical_ketosis_in_mainly_pasture_grazed_dairy_cows_in_New_Zealand_in_early_lactation_ L2 - http://www.tandfonline.com/doi/full/10.1080/00480169.2013.823829 DB - PRIME DP - Unbound Medicine ER -