Abstract
First DHI test milk that was sampled prior to displaced abomasum (DA) diagnosis was used to evaluate milk protein/fat ratio (PFR) for prediction of subsequent DA in dairy cows. Odds ratio, sensitivity, specificity, and likelihood ratio were determined. Twenty-seven DA cases were matched to 3 controls per case by herd and calving date. Milk was tested at a median of 19 d after calving, which was 8 d prior to the median time of DA diagnosis. Adjusted for parity and days in milk, a protein/fat ratio < or = 0.72 was 8.2 times more likely to come from a cow subsequently diagnosed with DA than a protein/fat ratio > 0.72. Using the cut off value of 0.72, the sensitivity of PFR for DA was 80% and the specificity was 68%. A receiver operating characteristics curve indicated that the minimum sum of false negative and false positive results was at a PFR cut off value of 0.72. The likelihood ratio indicated that protein/fat ratios < or = 0.62 are 3.8 times more likely to come from cows that are diagnosed subsequently with DA than from cows without DA. The protein/fat ratio in 1st DHI test milk may predict subsequent DA in dairy cows.
Full text
PDF
Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Bartlett P. C., Kopcha M., Coe P. H., Ames N. K., Ruegg P. L., Erskine R. J. Economic comparison of the pyloro-omentopexy vs the roll-and-toggle procedure for treatment of left displacement of the abomasum in dairy cattle. J Am Vet Med Assoc. 1995 Apr 15;206(8):1156–1162. [PubMed] [Google Scholar]
- Constable P. D., Miller G. Y., Hoffsis G. F., Hull B. L., Rings D. M. Risk factors for abomasal volvulus and left abomasal displacement in cattle. Am J Vet Res. 1992 Jul;53(7):1184–1192. [PubMed] [Google Scholar]
- Correa M. T., Erb H., Scarlett J. Path analysis for seven postpartum disorders of Holstein cows. J Dairy Sci. 1993 May;76(5):1305–1312. doi: 10.3168/jds.S0022-0302(93)77461-5. [DOI] [PubMed] [Google Scholar]
- Curtis C. R., Erb H. N., Sniffen C. J., Smith R. D., Kronfeld D. S. Path analysis of dry period nutrition, postpartum metabolic and reproductive disorders, and mastitis in Holstein cows. J Dairy Sci. 1985 Sep;68(9):2347–2360. doi: 10.3168/jds.S0022-0302(85)81109-7. [DOI] [PubMed] [Google Scholar]
- Geishauser T., Diederichs M., Beuing R. Schätzung der Erblichkeit von Labmagenverlagerung bei Deutsch-Schwarzbunten Rindern in Hessen. Zentralbl Veterinarmed A. 1996 Apr;43(2):87–92. [PubMed] [Google Scholar]
- Gröhn Y. T., Eicker S. W., Hertl J. A. The association between previous 305-day milk yield and disease in New York State dairy cows. J Dairy Sci. 1995 Aug;78(8):1693–1702. doi: 10.3168/jds.S0022-0302(95)76794-7. [DOI] [PubMed] [Google Scholar]
- Markusfeld O. Periparturient traits in seven high dairy herds. Incidence rates, association with parity, and interrelationships among traits. J Dairy Sci. 1987 Jan;70(1):158–166. doi: 10.3168/jds.S0022-0302(87)79990-1. [DOI] [PubMed] [Google Scholar]
- Martin S. W., Kirby K. L., Curtis R. A. Left abomasal displacement in dairy cows: its relationship to production. Can Vet J. 1978 Sep;19(9):250–253. [PMC free article] [PubMed] [Google Scholar]
- Uribe H. A., Kennedy B. W., Martin S. W., Kelton D. F. Genetic parameters for common health disorders of Holstein cows. J Dairy Sci. 1995 Feb;78(2):421–430. doi: 10.3168/jds.S0022-0302(95)76651-6. [DOI] [PubMed] [Google Scholar]
- Varden S. A. Displacement of the abomasum in the cow. Incidence, etiological factors and results of treatment. Nord Vet Med. 1979 Mar;31(3):106–113. [PubMed] [Google Scholar]