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
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...
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KeAi Communications Co., Ltd.
2017-03-01
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| Series: | Animal Nutrition |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2405654516301287 |
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| author | Martin P. Hughes Victor Mlambo Cicero H.O. Lallo Nasreldin A.D. Basha Ignatius V. Nsahlai Paul G.A. Jennings |
| author_facet | Martin P. Hughes Victor Mlambo Cicero H.O. Lallo Nasreldin A.D. Basha Ignatius V. Nsahlai Paul G.A. Jennings |
| author_sort | Martin P. Hughes |
| collection | DOAJ |
| description | 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. |
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| institution | Directory Open Access Journal |
| issn | 2405-6545 |
| language | English |
| last_indexed | 2024-12-13T18:56:36Z |
| publishDate | 2017-03-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Animal Nutrition |
| spelling | doaj.art-33ca13833f8c4535b62094c5eefefe322022-12-21T23:34:47ZengKeAi Communications Co., Ltd.Animal Nutrition2405-65452017-03-0131677610.1016/j.aninu.2016.10.002Accuracy of two optical chlorophyll meters in predicting chemical composition and in vitro ruminal organic matter degradability of Brachiaria hybrid, Megathyrsus maximus, and Paspalum atratumMartin P. Hughes0Victor Mlambo1Cicero H.O. Lallo2Nasreldin A.D. Basha3Ignatius V. Nsahlai4Paul G.A. Jennings5Department of Food Production, Faculty of Food and Agriculture, University of the West Indies, St. Augustine, Trinidad and TobagoDepartment of Animal Science, School of Agricultural Sciences, Faculty of Agriculture, Science and Technology, North-West University, Mmabatho 2745, South AfricaOpen Tropical Forage-Animal Production Laboratory, Department of Food Production, Faculty of Food and Agriculture, University of the West Indies, St. Augustine, Trinidad and TobagoDepartment of Animal & Poultry Science, School of Agricultural, Earth and Environmental Sciences, College of Agriculture, Engineering and Science, University of KwaZulu-Natal, Scottsville, Pietermaritzburg, South AfricaDepartment of Animal Nutrition, Faculty of Animal Production, Shampat Campus, University of Khartoum, Khartoum North 1334, SudanMARJEN Consulting Group, Spanish Town JMACE25, JamaicaThe 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.http://www.sciencedirect.com/science/article/pii/S2405654516301287Optical chlorophyll measurementsChemical compositionPrediction modelTropical grass |
| spellingShingle | Martin P. Hughes Victor Mlambo Cicero H.O. Lallo Nasreldin A.D. Basha Ignatius V. Nsahlai Paul G.A. Jennings 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 Animal Nutrition Optical chlorophyll measurements Chemical composition Prediction model Tropical grass |
| title | 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 |
| title_full | 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 |
| title_fullStr | 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 |
| title_full_unstemmed | 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 |
| title_short | 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 |
| title_sort | 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 |
| topic | Optical chlorophyll measurements Chemical composition Prediction model Tropical grass |
| url | http://www.sciencedirect.com/science/article/pii/S2405654516301287 |
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