Abstract
This study aimed to evaluate the HerbValo method in comparison to conventional field measurement techniques as a tool for estimating the herbage utilization and dry matter (DM) intake by grazing dairy cows under subtropical conditions. It was carried out during 18 months in a commercial farm of Southern Brazil. The herbage utilization was estimated monthly in two to four randomly selected paddocks (total n = 40) using the rising-plate meter or the double-sampling technique. In parallel, the herbage utilization was estimated by the HerbValo method, which is based on simple descriptions of the herd, supplements, pasture and grazing management. Values of herbage utilization estimated by field techniques were linearly (P < 0.01) related to those estimated by HerbValo, with no effect of pasture type (tropical vs. temperate) on the origin or on the slope of the regression (slope = 0.97; origin = -0.1; R2 = 0.81; rsd = 0.17 t DM/ha). At cow × day level, values of herbage intake estimated by field techniques were also linearly related to those estimated by HerbValo (P < 0.01; R2 = 0.82; rsd = 1.30 kg DM/cow/day). A negative linear relationship (P < 0.01) between herbage and supplement intake was obtained for both field (slope = -1.06; R2 = 0.72; rsd = 1.64) and HerbValo (slope = -0.92; R2 = 0.82; rsd = 1.08) approaches. Herbage utilization and intake by a dairy herd in a subtropical grazing-based system can be reliably estimated by the HerbValo method with the advantage of not requiring direct field pasture measurements.
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Data availability
The data sets generated during this study are available and obtainable from the corresponding authors on reasonable request.
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The authors thank the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES, Brazil) and the Highlands.3 Project (Marie Skłodowska-Curie grant agreement No 872328) for scholarships support.
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G. V. Kozloski, L Wlodarski, R. Delagarde, C. A. Pozo and H.M.N. Ribeiro Filho conceived and designed the study; contributed with data analysis and have reviewed the manuscript critically. L Wlodarski, L. B. Temp, M. L. Moraes and M. G. Santos conducted data gathering and laboratorial analysis.
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The study was carried out following procedures approved by the Animal Care and Ethical Committee of the Universidade Federal de Santa Maria (Protocol n°
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Wlodarski, L., Delagarde, R., Pozo, C.A. et al. Calculating herbage utilization and intake by dairy cows under subtropical conditions using conventional field measurement techniques or the HerbValo method. Trop Anim Health Prod 56, 26 (2024). https://doi.org/10.1007/s11250-023-03863-2
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DOI: https://doi.org/10.1007/s11250-023-03863-2