Year: 2003
Type: article
Abstract: One hundred and fifty liver samples were collected from forty multiparous Holstein cows at an average of 16 d prepartum to 30 d postpartum.The objectives of this study were to determine the statistical relationship between liver percentages of dry matter (LDM) and total lipids (TL) and triacylglycerols (TAG) on a wet basis and to develop predictive equations of TL and TAG from LDM that could be used for the diagnosis of fatty liver in transition cows.Estimates of LDM changed slightly with time to calving.The best-fitting models to describe the inverse relationship between LDM and liver lipids using the entire data set (LDM: 20.0 to 36.2%, TL: 2.9 to 14.9%; TAG: 0.7 to 10.4%) were the following second-order polynomial derived equations.For TL = 44.268-(3.3625 x LDM) + (0.0717 x LDM 2 ) (R 2 = 0.53%; P < 0.0001) and for TAG = 39.983-(3.2370 x LDM) + (0.0678 x LDM 2 ) (R 2 = 0.58%; P < 0.0001).The precision of equation for TAG (R 2 = 0.61) slightly improved with a third-order polynomial equation after reducing data to LDM greater than 25% because of less variability in liver TAG with higher LDM.Time to calving did not influence the relationship between LDM and liver lipids.For practical applications, these predictive equations could be used as an approximation of a mild to moderate (up to 10% TAG, wet weight) fatty liver in multiparous periparturient dairy cows when the chemical analysis to quantify liver lipids is not affordable. Fatty liver, liver triacylglycerol, liver DM, transition cows
Source: Acta Veterinaria Brno
Authors: O. Rosendo, L. R. McDowell
Language: English
Subfield: Animal Science and Zoology
Domain: Life Sciences
SDG: Zero hunger
Open Access status: hybrid
OpenAlex ID: W2308422700