Accuracy of two optical chlorophyll meters in predicting chemical composition and in vitro ruminal organic matter degradability of Brachiaria hybrid, Megathyrsus maximus , and Paspalum atratum
| Autor: | Martin P. Hughes, Victor Mlambo, Paul G.A. Jennings, N. A. D. Basha, Cicero H. O. Lallo, Ignatius V. Nsahlai |
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| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
Chemical composition chemistry.chemical_element Biology Optical chlorophyll measurements 01 natural sciences chemistry.chemical_compound Food Animals Prediction model Lignin Organic matter lcsh:SF1-1100 chemistry.chemical_classification Tropical grass 04 agricultural and veterinary sciences biology.organism_classification Brachiaria Nitrogen Agronomy Megathyrsus maximus chemistry Paspalum atratum Chlorophyll 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Animal Science and Zoology lcsh:Animal culture 010606 plant biology & botany |
| Zdroj: | Animal Nutrition, Vol 3, Iss 1, Pp 67-76 (2017) |
| ISSN: | 2405-6545 |
| DOI: | 10.1016/j.aninu.2016.10.002 |
| Popis: | The objective of this study was to determine the accuracy and reliability of 2 optical chlorophyll meters: FieldScout CM 1,000 NDVI and Yara N-Tester, in predicting neutral detergent fibre (NDF), acid detergent fibre (ADF), acid detergent lignin (ADL), acid detergent insoluble nitrogen (ADIN) and in vitro ruminal organic matter degradability (IVOMD) of 3 tropical grasses. Optical chlorophyll measurements were taken at 3 stages (4, 8 and 12 weeks) of regrowth in Brachiaria hybrid, and Megathyrsus maximus and at 6 and 12 weeks of regrowth in Paspalum atratum (cv. Ubon). Optical chlorophyll measurements showed the highest correlation (r = 0.57 to 0.85) with NDF concentration. The FieldScout CM 1,000 NDVI was better than the Yara N-Tester in predicting NDF (R2 = 0.70) and ADF (R2 = 0.79) concentrations in Brachiaria hybrid and NDF (R2 = 0.79) in M. maximus. Similarly, FieldScout CM 1,000 NDVI produced better estimates of 24 h IVOMD (IVOMD24h) in Brachiaria hybrid (R2 = 0.81) and IVOMD48h in Brachiaria hybrid (R2 = 0.65) and M. maximus (R2 = 0.75). However, these prediction models had relatively low concordance correlation coefficients, i.e., CCC >0.90, but random errors were the main source of bias. It was, therefore, concluded that both optical chlorophyll meters were poor and unreliable predictors of ADIN and ADL concentrations. Overall, the FieldScout CM 1,000 NDVI shows potential to produce useful estimates of IVOMD24h and ADF in Brachiaria hybrid and IVOMD48h and NDF concentrations in M. maximus. |
| Databáze: | OpenAIRE |
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