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• W2073879975 abstract "Increasing milk production per cow over the last decades has led to a more intense negative energy balance and extended the duration of body fat mobilization. Management of body condition requires that body condition scores be evaluated on a visual basis. A more objective approach is the measurement of the backfat thickness (BFT) using an ultrasound device. Metering precision of 1 mm enables the recognition of even slight changes in the subcutaneous fat thickness. Because both methods are time consuming in large dairy herds, automating body condition׳s routine evaluation is of rising concern. This study investigated whether traits of the animals׳ rear area extracted from Time-of-Flight camera recordings might be useful indicators of BFT. Furthermore, characteristics of BFT within and across different lactation stages were analyzed. Data recording was performed on the dairy research farm Karkendamm of the Institute of Animal Breeding and Husbandry of the University of Kiel (Germany) from July 2011 to May 2012. BFT measures (n=2931) and two measures (n=1779 and n=1848) obtained from Time-of-Flight recordings from 96 primiparous and multiparous Holstein-Friesian dairy cows were analyzed using seven different linear (mixed) models. BFT estimation using the cow as random or fixed effect, lactation week and observation month as fixed effects, and a linear regression on the two Time-of-Flight measurements has been promising. The correlation among observed values and estimator was 0.96. Repeatability of BFT within each of the three lactation stages was large and ranged from 0.80 to 0.89. Correlations of cow effects among lactation stages were also high and range from 0.65 between first and third lactation stage to 0.89 between second and third lactation stage." @default.
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• W2073879975 date "2014-07-01" @default.
• W2073879975 modified "2023-10-13" @default.
• W2073879975 title "Estimation of backfat thickness using extracted traits from an automatic 3D optical system in lactating Holstein-Friesian cows" @default.
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• W2073879975 doi "https://doi.org/10.1016/j.livsci.2014.03.022" @default.
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