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Effect of different measurement methods on predicted dry matter content in whole-plant corn forage and silage.

E. C. Diepersloot

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06-24-2020

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Abstract:

W44
Effect of different measurement methods on predicted dry matter content in whole-plant corn forage and silage.
E. C. Diepersloot*1, E. M. de Paula1,2, M. R. Pupo1, L. G. Ghizzi1,3, C. Heinzen Jr.1, C. L. McCary1, L. F. Ferraretto1. 1Department of Animal Sciences, University of Florida Gainesville, FL, 2Instiuto de Zootecnia, Centro APTA Bovinos de Corte Sert�ozinho, S�o Paulo, Brazil, 3Department of Animal Nutrition and Animal Production, University of S�o Paulo Pirassununga, S�o Paulo, Brazil.

This study aimed to evaluate the effectiveness of portable Near-Infrared Spectrometers (pNIRS) and Koster ovens in predicting DM content of whole-plant corn forage (WPCF) and silage (WPCS). Experiments 1 and 2 compared 3 methods of measuring DM of WPCF and WPCS, respectively, as follows: 1) a forced-air oven set at 60�C for 48 h (gold standard), 2) Koster ovens weighed after 30 min then every 10 min until reaching a constant weight (change of less than 0.1g), and 3) pNIRS (average of 10 scans). Experiment 3 was an on farm trial and measured DM content of WPCF samples with Koster ovens and pNIRS. Following farm protocol, Koster ovens were weighed after 40 min then every 10 min until reaching a constant weight (change of less than 0.5g). Data were analyzed using Proc Glimmix and Proc Corr of SAS. In experiment 1, the DM average for Koster ovens (34.3%) and forced-air oven (35.5%) did not differ (P = 0.39); but the DM average for all 3 pNIRS (30.6, 31.0, and 30.5%) were lower (P ≤ 0.05) than other methods. Additionally, all other treatments were correlated with the forced-air oven (R2 ≥ 0.85). In experiment 2, the DM of the forced-air oven (34.1%) and Koster oven (33.3%) did not differ (P ≥ 0.08) from pNIRS 2 (33.3% DM). The pNIRS 3 treatment (33.2% DM) only differed from the forced-air oven (P = 0.05). Forced-air oven and Koster oven were correlated (R2 = 0.82), while the pNIRS were not correlated with either (R2 ≤ 0.30). For experiment 3, the average DM for Koster ovens (37.3%) was greater than (P < 0.001) pNIRS 1 (32.5%), pNIRS 2 (33.7%), and pNIRS 3 (33.6%) with no difference among pNIRS (P ≥ 0.19). All pNIRS were correlated with the Koster oven (R2 ≥ 0.80). Under the conditions of the present study Koster ovens accurately assess DM content of WPCF and WPCS. However, pNIRS should be used with caution in WPCF as predicted DM was lower than the actual DM content. Although WPCS DM values from the pNIRS did not differ from other treatments, caution should still be used as there were differences among units and pNIRS were not correlated with other treatments.

Keywords: NIR, Koster oven, dry matter.

Biography: Evan comes from a third generation dairy farming family in Florida. He obtained a bachelor's degree in animal science and is currently pursuing a master's degree in animal science with a focus in ruminant nutrition.