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Article ; Online: Spatiotemporal water quality variability in a highly loaded surface flow wastewater treatment wetland.

Hitchcock, Daniel R / Bell, Natasha L / Strosnider, William / Smith, Matt C

2022 Volume 51, Issue 1, Page(s) 101–111

Abstract: This study evaluates spatiotemporal relationships between water quality parameters (WQPs), nutrients, suspended solids, and biochemical oxygen demand (BOD) concentrations within an engineered wastewater treatment wetland system in the Georgia Piedmont, ... ...

Abstract	This study evaluates spatiotemporal relationships between water quality parameters (WQPs), nutrients, suspended solids, and biochemical oxygen demand (BOD) concentrations within an engineered wastewater treatment wetland system in the Georgia Piedmont, USA. We explored factors related to treatment efficiency within a heavily loaded 630-m
MeSH term(s)	Nitrogen/analysis ; Sewage ; Waste Disposal, Fluid ; Waste Water ; Water Purification ; Water Quality ; Wetlands
Chemical Substances	Sewage ; Waste Water ; Nitrogen (N762921K75)
Language	English
Publishing date	2022-01-03
Publishing country	United States
Document type	Journal Article
ZDB-ID	120525-0
ISSN	1537-2537 ; 0047-2425
ISSN (online)	1537-2537
ISSN	0047-2425
DOI	10.1002/jeq2.20309
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Article: Spatiotemporal water quality variability in a highly loaded surface flow wastewater treatment wetland

Hitchcock, Daniel R. / Bell, Natasha L. / Strosnider, William / Smith, Matt C.

Journal of environmental quality. 2022 Jan., v. 51, no. 1

2022

Abstract	This study evaluates spatiotemporal relationships between water quality parameters (WQPs), nutrients, suspended solids, and biochemical oxygen demand (BOD) concentrations within an engineered wastewater treatment wetland system in the Georgia Piedmont, USA. We explored factors related to treatment efficiency within a heavily loaded 630‐m² surface flow wetland system over a 2‐yr period. Relationships between temperature, dissolved oxygen (DO), and oxidation‐reduction potential (ORP) were observed; relationships were also seen between these WQPs and nutrient concentrations. Because temperature, DO, and ORP affect nitrogen (N) cycling rates, seasonal trends in N forms were evident in the system. Organic N and inorganic/organic phosphorus concentrations correlated with solids concentrations in the vegetated system without exhibiting seasonal trends. Surface water within the vegetated section generally exhibited anoxic conditions, leading to removal of nitrate‐N within the system; however, limited mineralization and nitrification occurred, which greatly limited overall N removal. Plant selection and lack of maintenance likely led to high solids and BOD contributions to treatment wetland surface water, which varied substantially between and along monitored transects. Because so few studies have investigated treatment dynamics within treatment wetland cells, focusing solely on influent/effluent characterization, radical spatiotemporal variability may be the norm as opposed to the commonly accepted assumptions of relatively uniform pollutant degradation across treatment wetland cells. This spatiotemporal variability in WQPs underscores the dynamic nature of treatment wetlands and the need for routine maintenance, including sludge removal and plant harvesting.
Keywords	biochemical oxygen demand ; mineralization ; nitrate nitrogen ; nitrification ; nitrogen ; organic phosphorus ; overland flow ; oxygen ; piedmont ; pollutants ; redox potential ; sludge ; surface water ; temperature ; wastewater treatment ; water quality ; wetlands ; Georgia
Language	English
Dates of publication	2022-01
Size	p. 101-111.
Publishing place	John Wiley & Sons, Ltd
Document type	Article
Note	JOURNAL ARTICLE
ZDB-ID	120525-0
ISSN	1537-2537 ; 0047-2425
ISSN (online)	1537-2537
ISSN	0047-2425
DOI	10.1002/jeq2.20309
Database	NAL-Catalogue (AGRICOLA)

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Article: Potential Susceptibility of Six Aquatic Plant Species to Infection by Five Species of

Bell, Natasha L / Jeffers, Steven N / Hitchcock, Daniel R / White, Sarah A

Plant disease

2021 Volume 105, Issue 12, Page(s) 4074–4083

Abstract: Investigations of the susceptibility of aquatic plants to species ... ...

Abstract	Investigations of the susceptibility of aquatic plants to species of
MeSH term(s)	Phytophthora ; Plant Leaves ; Plant Roots ; Plants ; Rhododendron
Language	English
Publishing date	2021-12-03
Publishing country	United States
Document type	Journal Article
ZDB-ID	754182-x
ISSN	0191-2917
ISSN	0191-2917
DOI	10.1094/PDIS-10-20-2190-RE
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Article: Effects of monensin and protein supplementation on intake, digestion, and ruminal fermentation in beef cattle consuming low-quality forage

Martinez, Javier J. / Löest, Clint A. / McCuistion, Kimberly C. / Wester, David B. / Bell, Natasha L.

Applied animal science. 2022 Feb., v. 38, no. 1

2022

Abstract: The objective of this study was to evaluate the effects of monensin and protein supplementation and their interaction on intake, apparent digestion, and ruminal fermentation variables in cattle consuming low-quality forage. Four ruminally cannulated cows ...

Abstract	The objective of this study was to evaluate the effects of monensin and protein supplementation and their interaction on intake, apparent digestion, and ruminal fermentation variables in cattle consuming low-quality forage. Four ruminally cannulated cows (637 ± 24 kg of BW) were used in a 4 × 4 Latin square design. Treatments were arranged as a 2 × 2 factorial: (1) monensin (0 or 200 mg∙cow⁻¹∙d⁻¹) and (2) protein (0 or 0.64 kg∙cow⁻¹∙d⁻¹ CP). Day 1 through 4 of each period, animals were fed only low-quality forage, d 5 through 14 allowed for treatment adaptation, and d 15 through 20 were for sample collection. Data were analyzed using the MIXED procedure of SAS 9.4 (SAS Institute Inc.). Neither a monensin × protein interaction nor a monensin effect (P ≥ 0.30) was observed for any intake or digestion variable measured. In contrast, protein treatment increased (P < 0.01) all measures of intake. Protein increased (P < 0.01) OM digestibility, total digestible OM intake, and total digestible NDF intake but had no effect (P = 0.13) on NDF digestibility. A monensin × protein interaction (P = 0.33) or monensin effect (P = 0.34) were not observed for total VFA concentration, but protein increased (P < 0.01) total VFA concentration. A tendency for monensin × protein interaction was observed for the acetate:propionate ratio (P = 0.06) and molar percentage of propionate. Monensin increased (P < 0.01) molar percentage of propionate but had no effect (P = 0.21) on acetate. Although monensin altered ruminal VFA profiles, providing monensin to cows consuming a low-quality-forage diet provided no benefits in forage intake or digestion.
Keywords	acetates ; beef cattle ; cannulas ; digestibility ; feed intake ; forage ; monensin ; propionic acid ; protein supplements ; rumen fermentation
Language	English
Dates of publication	2022-02
Size	p. 13-21.
Publishing place	Elsevier Inc.
Document type	Article
ISSN	2590-2865
DOI	10.15232/aas.2021-02219
Database	NAL-Catalogue (AGRICOLA)

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Article: Potential Susceptibility of Six Aquatic Plant Species to Infection by Five Species of Phytophthora

Bell, Natasha L. / Jeffers, Steven N. / Hitchcock, Daniel R. / White, Sarah A.

Plant disease. 2021 Dec. 30, v. 105, no. 12

2021

Abstract: Investigations of the susceptibility of aquatic plants to species of Phytophthora are limited. Therefore, the objective of this study was to assess the potential susceptibility of six aquatic plant species, frequently used in constructed wetlands or ... ...

Abstract	Investigations of the susceptibility of aquatic plants to species of Phytophthora are limited. Therefore, the objective of this study was to assess the potential susceptibility of six aquatic plant species, frequently used in constructed wetlands or vegetated channels, to infection by five species of Phytophthora commonly found at nurseries in the southeastern United States. In a greenhouse experiment, roots of each plant species (Agrostis alba, Carex stricta, Iris ensata ‘Rising Sun’, Panicum virgatum, Pontederia cordata, and Typha latifolia) growing in aqueous solutions were exposed to zoospores of each of the species of Phytophthora (Phytophthora cinnamomi, Phytophthora citrophthora, Phytophthora cryptogea, Phytophthora nicotianae, and Phytophthora palmivora). Zoospore presence and activity in solution were monitored with a standard baiting bioassay with rhododendron leaf discs as baits. Experiments were initiated in 2016 and repeated in 2017 and 2018. During the 2016 trials, Phytophthora spp. were not isolated from the roots of any of the plants, but some roots of C. stricta, P. virgatum, and T. latifolia were infected with multiple species of Phytophthora during trials in 2017 and 2018. Presence of plant roots reduced the percentage of rhododendron leaf discs infected by zoospores of four of the species of Phytophthora but not those infected by P. cinnamomi, which suggested that roots of these plants negatively affected the presence or activity of zoospores of these four species of Phytophthora in the aqueous growing solution. Results from this study demonstrated that certain aquatic plant species may be sources of inoculum at ornamental plant nurseries if these plants are present naturally in waterways or used in constructed wetlands treating water flowing off production areas, which could be of concern to plant producers who recycle irrigation water.
Keywords	Agrostis ; Carex stricta ; Iris ensata ; Panicum virgatum ; Phytophthora cinnamomi ; Phytophthora citrophthora ; Phytophthora cryptogea ; Phytophthora nicotianae ; Phytophthora palmivora ; Pontederia cordata ; Rhododendron ; Typha latifolia ; aquatic plants ; bioassays ; greenhouse experimentation ; inoculum ; irrigation water ; leaves ; ornamental plants ; zoospores
Language	English
Dates of publication	2021-1230
Size	p. 4074-4083.
Publishing place	The American Phytopathological Society
Document type	Article
ZDB-ID	754182-x
ISSN	0191-2917
ISSN	0191-2917
DOI	10.1094/PDIS-10-20-2190-RE
Database	NAL-Catalogue (AGRICOLA)

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Article: Effects of cyclic monensin feeding on ruminal function in cannulated beef steers consuming low-quality forage

Hook, Kayla C. / Machen, Richard V. / Wester, David B. / McCuistion, Kimberly C. / Gonzalez, Daisy A. / Hernandez, Alicia G. / Bell, Natasha L.

Applied animal science. 2022 Apr., v. 38, no. 2

2022

Abstract: The aim of this research was to evaluate the effects of cyclically feeding monensin (Rumensin 90, Elanco Animal Health) to ruminally cannulated steers (12 Bos taurus; 260 kg of BW) consuming low-quality forage (4.9% CP) on measures of intake, digestion, ... ...

Abstract	The aim of this research was to evaluate the effects of cyclically feeding monensin (Rumensin 90, Elanco Animal Health) to ruminally cannulated steers (12 Bos taurus; 260 kg of BW) consuming low-quality forage (4.9% CP) on measures of intake, digestion, and ruminal function. Twelve steers were randomly assigned to 1 of 3 treatments in a completely randomized design: (1) no monensin (CON); (2) 200 mg·head⁻¹·d⁻¹ monensin (MON); or (3) 200 mg·head⁻¹·d⁻¹ monensin for 14 d and 0 mg·head⁻¹·d⁻¹ monensin for the subsequent 14 d (CYC; recurrent cycle). Hay and ort samples were collected d 10 through 13 for intake determination during each of the four 28-d replicated cycles. Rumen fluid was collected with a suction strainer 0, 2, 4, 8, and 12 h after feeding on d 14 for pH and VFA analysis. Data were analyzed using the MIXED procedure of SAS 9.4 (SAS Institute Inc.). Treatment × cycle interactions or treatment effects were not observed for any measure of intake (OM intake, NDF intake; P ≥ 0.17) or pH (P = 0.13). A tendency for a treatment × cycle interaction was observed (P = 0.08) for OM digestion but not for NDF digestion (P = 0.37). Treatment × cycle interactions were observed (P < 0.01) for molar proportions of acetate, propionate, and acetate:propionate ratio. Because these treatment × cycle interactions occurred, treatment × hour interactions, treatment effects, and hour effects were evaluated within cycles for these parameters. Treatment × hour interactions (P ≤ 0.02) occurred for molar proportion of propionate in cycle 1 and propionate and acetate:propionate ratio in cycle 3, and there was a tendency (P = 0.09) for a treatment × hour interaction for acetate:propionate in cycle 4. Although treatment effects were observed for molar proportions of acetate, propionate, and acetate:propionate ratio in cycle 1 (P ≤ 0.01), these effects had diminished by cycle 4 (P ≥ 0.39). An effect of hour after feeding was observed (P ≤ 0.02) in all 4 cycles for acetate, propionate, acetate:propionate, and ruminal pH. Further evaluation of monensin feeding methods that vary duration of feeding and withdrawal periods may be warranted. Additionally, further study concerning differences in the effect of these methods on a diet bases on concentrate versus low-quality forage warrant investigation.
Keywords	acetates ; beef ; cannulas ; diet ; forage ; monensin ; pH ; propionic acid ; rumen fermentation ; rumen fluids
Language	English
Dates of publication	2022-04
Size	p. 129-140.
Publishing place	Elsevier Inc.
Document type	Article
ISSN	2590-2865
DOI	10.15232/aas.2021-02202
Database	NAL-Catalogue (AGRICOLA)

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Article: Phytophthora Species Associated with Plants in Constructed Wetlands and Vegetated Channels at a Commercial Plant Nursery Over Time

Ridge, Garrett A / Bell, Natasha L / Gitto, Andrew J / Jeffers, Steven N / White, Sarah A

HortTechnology. 2019 Dec., v. 29, no. 6

2019

Abstract: Constructed wetlands have been used for decades in agricultural settings to remediate nutrients and other agrichemicals from irrigation runoff and drainage; however, little is known about the presence and distribution of Phytophthora species within ... ...

Abstract	Constructed wetlands have been used for decades in agricultural settings to remediate nutrients and other agrichemicals from irrigation runoff and drainage; however, little is known about the presence and distribution of Phytophthora species within irrigation runoff water being treated in constructed wetlands. Therefore, we collected plant samples from within vegetated runoff collection channels and treatment stages of two constructed wetland systems receiving irrigation runoff at a commercial plant nursery in Cairo, GA, to determine if roots of wetland plants were infested by species of Phytophthora. Samples were collected 12 times, at 1- to 2-month intervals, over a 19-month period, from Mar. 2011 through Sept. 2012. The sample period covered all four seasons of the year, so we could determine if the association of Phytophthora species with roots of specific plant species varied with season. Approximately 340 samples from 14 wetland plant species were collected, and 22 isolates of Phytophthora species were recovered. Phytophthora species were typically isolated from plants in channels receiving runoff water directly from plant production areas; Phytophthora species were not detected on plants where water leaves the nursery. No seasonal patterns were observed in plant infestation or presence of species of Phytophthora. In fact, Phytophthora species were rarely found to be associated with the roots of the wetland plants collected; species of Phytophthora were found infesting roots of only 6.5% of the 336 plants sampled. Species of Phytophthora were not found to be associated with the roots of golden canna (Canna flaccida), lamp rush (Juncus effusus var. solutus), duckweed (Lemna valdiviana), or sedges (Carex sp.) during the study period. The exotic invasive plant species marsh dayflower [Murdannia keisak (33% of samples infested)] and alligatorweed [Alternanthera philoxeroides (15% of samples infested)] were found to have the first and third highest, respectively, incidences of infestation, with smooth beggartick (Bidens laevis) having the second highest incidence of samples infested (22%). Management of invasive species in drainage canals and constructed wetland systems may be critical because of their potential propensity toward infestation by Phytophthora species. Plant species recommended for further investigation for use in constructed wetlands to remediate irrigation runoff include golden canna, marsh pennywort (Hydrocotyle umbellata), pickerelweed (Pontederia cordata), and broadleaf cattail (Typha latifolia). The results from this study provide an important first look at the associations between species of Phytophthora and wetland plants in constructed wetland systems treating irrigation runoff and will serve to further optimize the design of constructed wetlands and other vegetation-based treatment technologies for the removal of plant pathogens from irrigation runoff.
Keywords	Alternanthera philoxeroides ; Bidens ; Canna ; Carex ; Hydrocotyle ; Juncus effusus ; Lemna ; Phytophthora ; Pontederia cordata ; Typha latifolia ; constructed wetlands ; drainage ; invasive species ; irrigation ; marshes ; plant nurseries ; runoff ; wetland plants
Language	English
Dates of publication	2019-12
Size	p. 736-744.
Publishing place	American Society for Horticultural Science
Document type	Article
Note	NAL-AP-2-clean
ZDB-ID	1115665-x
ISSN	1063-0198
ISSN	1063-0198
DOI	10.21273/HORTTECH04300-19
Database	NAL-Catalogue (AGRICOLA)

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Article: Protocol and Interactive Routine forthe Design of Subsurface Bioreactors

Cooke, Richard A / Bell, Natasha L

Applied engineering in agriculture. 2014 Sept., v. 30, no. 5

2014

Abstract: One potential practice to reduce nitrate and phosphate transfer from subsurface (tile)-drained farmlands is the use of fixed-bed, in-field subsurface bioreactors. These bioreactors are trenches filled with carbon material (usually wood chips), which ... ...

Abstract	One potential practice to reduce nitrate and phosphate transfer from subsurface (tile)-drained farmlands is the use of fixed-bed, in-field subsurface bioreactors. These bioreactors are trenches filled with carbon material (usually wood chips), which serve as a medium for denitrifying bacteria to grow, thus reducing the amount of nitrate that enters water bodies from tile drains. If a bioreactor is undersized, water will not be detained long enough for denitrification to occur, or much of the water will bypass the system. On the other hand, if it is oversized, extreme reducing conditions can result in the formation of deleterious compounds. In this article, we propose a new protocol for optimizing the size of a bioreactor, describe an interactive routine in which this protocol has been implemented, and present the application of the routine to the design of a bioreactor in southern Minnesota. The routine is available in the online version of the Illinois Drainage Guide.
Keywords	bioreactors ; carbon ; denitrification ; denitrifying bacteria ; drainage ; engineering ; nitrates ; surface water ; wood chips ; Illinois ; Minnesota
Language	English
Dates of publication	2014-09
Size	p. 761-771.
Publishing place	American Society of Agricultural Engineers
Document type	Article
ZDB-ID	54345-7
ISSN	0883-8542
ISSN	0883-8542
DOI	10.13031/aea.30.9900
Database	NAL-Catalogue (AGRICOLA)

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Article: Effect of monensin inclusion on intake, digestion, and ruminal fermentation parameters by Bos taurus indicus and Bos taurus taurus steers consuming bermudagrass hay

Bell, Natasha L / Anderson, Robin C / Callaway, Todd R / Franco, Marcia O / Sawyer, Jason E / Wickersham, Tryon A

Journal of animal science. 2017 June 8, v. 95, no. 6

2017

Abstract: Effects of monensin inclusion and cattle subspecies on utilization of bermudagrass hay (13.7% CP, 77.3% NDF, and 38.8% ADF) were evaluated using ruminally cannulated steers (5 Bos taurus indicus [BI] and 5 Bos taurus taurus [BT]; 398 kg BW). Subspecies ... ...

Abstract	Effects of monensin inclusion and cattle subspecies on utilization of bermudagrass hay (13.7% CP, 77.3% NDF, and 38.8% ADF) were evaluated using ruminally cannulated steers (5 Bos taurus indicus [BI] and 5 Bos taurus taurus [BT]; 398 kg BW). Subspecies were concurrently subjected to a 2-period, 2-treatment crossover design. Treatments were 0 (CON) or 200 mg·steer-1·d-1 monensin (MON) in 0.91 kg dried distillers’ grains with solubles. Periods were 70 d in length: 20 d of adaptation, 22 d of sample collection, and 28 d for withdrawal of treatment. Steers were group housed during adaptation and moved to individual covered pens for sampling. Hay, ort, and fecal grab samples were collected d 21 through 25 for determination of intake and digestion. Ruminal fluid was collected with a suction strainer 0, 2, 4, 8, and 12 h after feeding on d 42 for pH, VFA, and ruminal NH3–N (RAN) analysis. Additionally, at h 2, ruminal fluid and contents were collected for determination of rate of NH3 production and CH4 production rate. No subspecies × monensin interactions were observed (P greater than or equal to 0.12). Monensin had no effect (P greater than or equal to 0.16) on intake or digestibility parameters. No subspecies effect (P greater than or equal to 0.11) was observed for forage OM intake, total OM intake, or OM digestion. Total digestible OM intake tended to be greater (P = 0.06) for BT steers than for BI steers (14.0 vs. 12.2 g/kg BW). There was an effect of hour after feeding (P less than or equal to 0.01) on pH, total VFA, acetate:propionate ratio, and molar percent acetate and propionate. Total VFA concentration was greater (P = 0.01) in CON steers than in MON steers (66.5 vs. 62.0 mM). Monensin decreased molar percent acetate (P = 0.02) from 72.5 to 71.2% and increased molar percent propionate (P < 0.01) from 16.9 to 18.7%, resulting in a reduced (P < 0.01) acetate:propionate ratio (from 4.34 to 3.85). Although not significantly (P = 0.19), monensin numerically reduced the CH4 production rate by 15.8%. Greater (P = 0.07) CH4 production rate tended to be observed in BI steers than in BT steers (21.4 vs. 16.6 μmol CH4·mL-1·h-1, respectively). Monensin had no effect (P greater than or equal to 0.32) on pH, RAN, or rate of NH3 production. A subspecies × hour after feeding interaction was observed for RAN, with BT having greater RAN at h 0 and 4, whereas BI had greater RAN at h 2, 8, and 12. Overall, monensin decreased the acetate:propionate ratio and total VFA concentration but had no effect on forage utilization. Bos taurus indicus steers consumed less digestible OM and had a greater CH4 production rate compared with BT steers, suggesting BT were better able to utilize the available forage resource than BI.
Keywords	Cynodon dactylon ; acetates ; ammonia ; ammonium nitrogen ; cannulas ; cross-over studies ; digestibility ; feed conversion ; forage ; hay ; methane ; methane production ; monensin ; pH ; propionic acid ; rumen fermentation ; rumen fluids ; steers
Language	English
Dates of publication	2017-0608
Size	p. 2736-2746.
Document type	Article
ZDB-ID	390959-1
ISSN	1525-3163 ; 0021-8812
ISSN (online)	1525-3163
ISSN	0021-8812
DOI	10.2527/jas2016.1011
Database	NAL-Catalogue (AGRICOLA)

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Article: Effect of monensin withdrawal on intake, digestion, and ruminal fermentation parameters by Bos taurus indicus and Bos taurus taurus steers consuming bermudagrass hay

Bell, Natasha L / Callaway, Todd R / Anderson, Robin C / Franco, Marcia O / Sawyer, Jason E / Wickersham, Tyron A

Journal of animal science. 2017 June 1, v. 95, no. 6

2017

Abstract	Effects of monensin inclusion and cattle subspecies on utilization of bermudagrass hay (13.7% CP, 77.3% NDF, and 38.8% ADF) were evaluated using ruminally cannulated steers (5 Bos taurus indicus [BI] and 5 Bos taurus taurus [BT]; 398 kg BW). Subspecies were concurrently subjected to a 2-period, 2-treatment crossover design. Treatments were 0 (CON) or 200 mg·steer-1·d-1 monensin (MON) in 0.91 kg dried distillers’ grains with solubles. Periods were 70 d in length: 20 d of adaptation, 22 d of sample collection, and 28 d for withdrawal of treatment. Steers were group housed during adaptation and moved to individual covered pens for sampling. Hay, ort, and fecal grab samples were collected d 21 through 25 for determination of intake and digestion. Ruminal fluid was collected with a suction strainer 0, 2, 4, 8, and 12 h after feeding on d 42 for pH, VFA, and ruminal NH3–N (RAN) analysis. Additionally, at h 2, ruminal fluid and contents were collected for determination of rate of NH3 production and CH4 production rate. No subspecies × monensin interactions were observed (P = 0.12). Monensin had no effect (P = 0.16) on intake or digestibility parameters. No subspecies effect (P = 0.11) was observed for forage OM intake, total OM intake, or OM digestion. Total digestible OM intake tended to be greater (P = 0.06) for BT steers than for BI steers (14.0 vs. 12.2 g/kg BW). There was an effect of hour after feeding (P = 0.01) on pH, total VFA, acetate:propionate ratio, and molar percent acetate and propionate. Total VFA concentration was greater (P = 0.01) in CON steers than in MON steers (66.5 vs. 62.0 mM). Monensin decreased molar percent acetate (P = 0.02) from 72.5 to 71.2% and increased molar percent propionate (P < 0.01) from 16.9 to 18.7%, resulting in a reduced (P < 0.01) acetate:propionate ratio (from 4.34 to 3.85). Although not significantly (P = 0.19), monensin numerically reduced the CH4 production rate by 15.8%. Greater (P = 0.07) CH4 production rate tended to be observed in BI steers than in BT steers (21.4 vs. 16.6 µmol CH4·mL-1·h-1, respectively). Monensin had no effect (P = 0.32) on pH, RAN, or rate of NH3 production. A subspecies × hour after feeding interaction was observed for RAN, with BT having greater RAN at h 0 and 4, whereas BI had greater RAN at h 2, 8, and 12. Overall, monensin decreased the acetate:propionate ratio and total VFA concentration but had no effect on forage utilization. Bos taurus indicus steers consumed less digestible OM and had a greater CH4 production rate compared with BT steers, suggesting BT were better able to utilize the available forage resource than BI.
Keywords	Cynodon dactylon ; acetates ; ammonia ; ammonium nitrogen ; cannulas ; cross-over studies ; digestibility ; distillers grains ; forage ; group housing ; hay ; methane ; methane production ; monensin ; pH ; propionic acid ; rumen fermentation ; rumen fluids ; steers
Language	English
Dates of publication	2017-0601
Size	p. 2737-2746.
Document type	Article
ZDB-ID	390959-1
ISSN	1525-3163 ; 0021-8812
ISSN (online)	1525-3163
ISSN	0021-8812
DOI	10.2527/jas2016.1013
Database	NAL-Catalogue (AGRICOLA)

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In stock of ZB MED Bonn / Germany

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Inter-library loan at ZB MED

More links

Kategorien

In stock of ZB MED Bonn / Germany

Order via subito

Inter-library loan at ZB MED

More links

Kategorien

In stock of ZB MED Bonn / Germany

Order via subito

Inter-library loan at ZB MED