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Dr. Serkan ATES
Oregon State University

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Research Keywords & Expertise

0 Environmental Sustainability
0 Grazing Management
0 Pasture-based animal production systems
0 Bioactive compounds and properties
0 agrivoltaics

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Preprint content
Published: 20 July 2021
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ACS Style

Massimo Bionaz; Serkan Ates; Ruth Muchiri; Richard B. van Breemen. Hepatic Cannabinoids Residuals and Bilirubinemia Are Highly Affected by Feeding Spent Hemp Biomass and Withdrawal Period in Lambs. 2021, 1 .

AMA Style

Massimo Bionaz, Serkan Ates, Ruth Muchiri, Richard B. van Breemen. Hepatic Cannabinoids Residuals and Bilirubinemia Are Highly Affected by Feeding Spent Hemp Biomass and Withdrawal Period in Lambs. . 2021; ():1.

Chicago/Turabian Style

Massimo Bionaz; Serkan Ates; Ruth Muchiri; Richard B. van Breemen. 2021. "Hepatic Cannabinoids Residuals and Bilirubinemia Are Highly Affected by Feeding Spent Hemp Biomass and Withdrawal Period in Lambs." , no. : 1.

Preprint content
Published: 19 July 2021
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Massimo Bionaz; Serkan Ates. Feeding Spent Hemp Biomass to Finishing Lambs: Effects on Blood Parameters Related to Health and Metabolism. 2021, 1 .

AMA Style

Massimo Bionaz, Serkan Ates. Feeding Spent Hemp Biomass to Finishing Lambs: Effects on Blood Parameters Related to Health and Metabolism. . 2021; ():1.

Chicago/Turabian Style

Massimo Bionaz; Serkan Ates. 2021. "Feeding Spent Hemp Biomass to Finishing Lambs: Effects on Blood Parameters Related to Health and Metabolism." , no. : 1.

Original research article
Published: 29 April 2021 in Frontiers in Sustainable Food Systems
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Agrivoltaic systems are designed to mutually benefit solar energy and agricultural production in the same location for dual-use of land. This study was conducted to compare lamb growth and pasture production from solar pastures in agrivoltaic systems and traditional open pastures over 2 years in Oregon. Weaned Polypay lambs grew at 120 and 119 g head−1 d−1 in solar and open pastures, respectively in spring 2019 (P = 0.90). The liveweight production between solar (1.5 kg ha−1 d−1) and open pastures (1.3 kg ha−1 d−1) were comparable (P = 0.67). Similarly, lamb liveweight gains and liveweight productions were comparable in both solar (89 g head−1 d−1; 4.6 kg ha−1 d−1) and open (92 g head−1 d−1; 5.0 kg ha−1 d−1) pastures (all P > 0.05) in 2020. The daily water consumption of the lambs in spring 2019 were similar during early spring, but lambs in open pastures consumed 0.72 L head−1 d−1 more water than those grazed under solar panels in the late spring period (P < 0.01). No difference was observed in water intake of the lambs in spring 2020 (P = 0.42). Over the entire period, solar pastures produced 38% lower herbage than open pastures due to low pasture density in fully shaded areas under solar panels. The results from our grazing study indicated that lower herbage mass available in solar pastures was offset by higher forage quality, resulting in similar spring lamb production to open pastures. Our findings also suggest that the land productivity could be greatly increased through combining sheep grazing and solar energy production on the same land in agrivoltaics systems.

ACS Style

Alyssa C. Andrew; Chad W. Higgins; Mary A. Smallman; Maggie Graham; Serkan Ates. Herbage Yield, Lamb Growth and Foraging Behavior in Agrivoltaic Production System. Frontiers in Sustainable Food Systems 2021, 5, 1 .

AMA Style

Alyssa C. Andrew, Chad W. Higgins, Mary A. Smallman, Maggie Graham, Serkan Ates. Herbage Yield, Lamb Growth and Foraging Behavior in Agrivoltaic Production System. Frontiers in Sustainable Food Systems. 2021; 5 ():1.

Chicago/Turabian Style

Alyssa C. Andrew; Chad W. Higgins; Mary A. Smallman; Maggie Graham; Serkan Ates. 2021. "Herbage Yield, Lamb Growth and Foraging Behavior in Agrivoltaic Production System." Frontiers in Sustainable Food Systems 5, no. : 1.

Journal article
Published: 17 February 2021 in African Journal of Range & Forage Science
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Climate change and degradation of natural resources pose daunting challenges in arid and semi-arid rangelands of southern Mediterranean region. Overcoming these challenges requires considerable management actions efforts. In this context, the current two-year (2017/2018 and 2018/2019) study investigated the effects of soil surface scarification and reseeding of rangelands with sulla (Hedysarum coronarium L.) on botanical composition, biomass production, water productivity and pastoral value in the Sbaihia community, Tunisia. The experimental design consisted of a randomised complete block design with six replications. The treatments were: (i) soil surface superficial scarification; (ii) reseeding sulla following soil scarification; and, (iii) control. Despite the relatively important interannual variation, the highest aboveground net primary production (2 307 and 5 330 kg dry matter ha-1), water productivity (9.5 and 11.8 kg DM mm-1), and pastoral value (2 099 and 4 853 forage units ha-1) values were recorded in the rangelands reseeded with sulla in both growing seasons. Sulla contribution in the species composition of reseeded rangelands increased from 1.7% in 2018 to 2% in 2019. Although soil surface scarification increased the vegetation cover, its effect on biomass production was not significant. Therefore, combined soil scarification and reseeding well-adapted native forage species has a great potential to improve productivity of semi-arid rangelands.

ACS Style

Slim Slim; Mounir Louhaichi; Mouldi Gamoun; Serkan Ates; Sawsan Hassan; Oumeima Ben Romdhane; Azaiez Ouled Belgacem. Assessment of soil surface scarification and reseeding with sulla (Hedysarum coronarium L.) of degraded Mediterranean semi-arid rangelands. African Journal of Range & Forage Science 2021, 1 -10.

AMA Style

Slim Slim, Mounir Louhaichi, Mouldi Gamoun, Serkan Ates, Sawsan Hassan, Oumeima Ben Romdhane, Azaiez Ouled Belgacem. Assessment of soil surface scarification and reseeding with sulla (Hedysarum coronarium L.) of degraded Mediterranean semi-arid rangelands. African Journal of Range & Forage Science. 2021; ():1-10.

Chicago/Turabian Style

Slim Slim; Mounir Louhaichi; Mouldi Gamoun; Serkan Ates; Sawsan Hassan; Oumeima Ben Romdhane; Azaiez Ouled Belgacem. 2021. "Assessment of soil surface scarification and reseeding with sulla (Hedysarum coronarium L.) of degraded Mediterranean semi-arid rangelands." African Journal of Range & Forage Science , no. : 1-10.

Journal article
Published: 29 August 2020 in Small Ruminant Research
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Selecting proper animal genotype that suits particular environment, management systems, market requirements and food processing is a fundamental step to achieve efficiency in livestock operations. Thus, this study compared the performance and meat quality of the fat-tailed, Akkaraman (AKK) and crossbred, Anatolian Merino (AMR) lambs under the feeding systems of annual forage mixture (AFM), perennial pastures (PAS) or concentrated-based (CON). There were no consistent breed differences for liveweight gain (LWG) but AKK lambs that were fed AFM had greater NDF intake and digestibility than AMR lambs (P < 0.01). Lambs that consumed forage-based diets had lower slaughter weights and weight-related carcass traits than lambs on CON (P <0.05). Dressing percentage was greater for AKK compared to AMR across all diets (P < 0.05). However, AMR had a greater meat to bone ratio and more intermuscular fat in the thoracic region than AKK (P < 0.01). The ratio of n6 to n3 fatty acids was lower with forage-based diets compared to CON (3.9 and 5.4, respectively). However, CLA isomers (C18:2, cis-9 trans-11 and C18:2 trans-10 cis-12c) and α-linolenic acid (C18:3 cis-9, cis-12, cis-15) composition of the fatty acids were all greater with forage-based feeding (P < 0.01). Ratios of n-6/n-3 FA were lower in PAS and AFM groups compared to CON indicating the superiority of forage based diets on producing higher meat quality. High CLA content of meat from pasture-fed fat tailed AKK lambs suggest positive human health benefits given tail fat is widely used in traditional cultural dishes.

ACS Style

Serkan Ates; Gurhan Keles; Ugur Demirci; Sukru Dogan; Mesut Kirbas; Shelby J. Filley; Nathan B. Parker. The effects of feeding system and breed on the performance and meat quality of weaned lambs. Small Ruminant Research 2020, 192, 106225 .

AMA Style

Serkan Ates, Gurhan Keles, Ugur Demirci, Sukru Dogan, Mesut Kirbas, Shelby J. Filley, Nathan B. Parker. The effects of feeding system and breed on the performance and meat quality of weaned lambs. Small Ruminant Research. 2020; 192 ():106225.

Chicago/Turabian Style

Serkan Ates; Gurhan Keles; Ugur Demirci; Sukru Dogan; Mesut Kirbas; Shelby J. Filley; Nathan B. Parker. 2020. "The effects of feeding system and breed on the performance and meat quality of weaned lambs." Small Ruminant Research 192, no. : 106225.

Original article
Published: 28 August 2020 in Grass and Forage Science
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Pasture legumes that persist under challenging agroecological conditions are crucial to ensure high lamb growth rates in dryland pastures. Pasture and lamb production from binary and diverse mixtures (Mix) of tall fescue (TF) with white clover (Whc), balansa clover (Bc), subterranean clover (Sc) and birdsfoot trefoil (Bft) were compared in a summer‐dry hill site in Corvallis, Oregon over a two‐year period. In 2018, all pasture combinations provided similar lamb liveweight gains (LWG, mean 177 g/day) in the first half of spring. Lambs in TF‐Bc and TF‐Mix pastures grew 31 to 41 g/day faster than those grazing TF‐Sc, TF‐Whc and TF‐Bft in the second half of spring (p < .05). Overall, TF‐Bc and TF‐Mix had higher (p < .05) legume contents (32% and 37% respectively) compared to other pasture combinations. In spring 2019, lambs that grazed the TF‐Mix and TF‐Whc pastures had higher LWG than those on other pastures (p < .05). The superior lamb growth rates were associated with the higher legume content and pasture quality maintained into the late spring period. Overall, the legume content of all pastures decreased over the course of the two‐year trial, with the decline being substantial for balansa clover. The present study confirmed that a high legume content of pastures leads to greater lamb growth rates. Total annual yields of pastures that had greater legume contents were superior to others (p < .05). Thus, a combination of self‐regenerating annual clovers with perennial legumes in pasture mixtures may ensure a higher legume content and longer persistence in dryland hill pastures.

ACS Style

Yunus Gultekin; Shelby J. Filley; Mary A. Smallman; David B. Hannaway; Serkan Ates. Pasture production, persistence of legumes and lamb growth in summer‐dry hill pastures. Grass and Forage Science 2020, 76, 159 -172.

AMA Style

Yunus Gultekin, Shelby J. Filley, Mary A. Smallman, David B. Hannaway, Serkan Ates. Pasture production, persistence of legumes and lamb growth in summer‐dry hill pastures. Grass and Forage Science. 2020; 76 (1):159-172.

Chicago/Turabian Style

Yunus Gultekin; Shelby J. Filley; Mary A. Smallman; David B. Hannaway; Serkan Ates. 2020. "Pasture production, persistence of legumes and lamb growth in summer‐dry hill pastures." Grass and Forage Science 76, no. 1: 159-172.

Journal article
Published: 30 July 2020 in Animals
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Increasing pasture diversity and spatially separated sowing arrangements can potentially increase the dry matter intake of high-quality forages leading to improved animal production. This study investigated the effects of simple (two-species) and diverse (six-species) pastures planted either in mixed or spatially separated adjacent pasture strips on performance, N partitioning, and methane emission of dairy cows. Thirty-six mid-lactation Jersey cows grazed either (1) simple mixed, (2) simple spatially separated, (3) diverse mixed, or (4) diverse spatially separated pastures planted in a complete randomized block design with three replicates. Compared to simple pasture, diverse pasture had lower CP content but higher condensed tannins and total phenolic compounds with an overall positive effect on yield of milk solids, nitrogen utilization, including a reduction of N output from urine, and methane yields per dry matter eaten. The spatial separation increased legume and CP content in simple pasture but decreased NDF in both diverse and simple pastures. In conclusion, increasing diversity using pasture species with higher nutritive value and secondary compounds can help improving the production while decreasing the environmental effect of dairy farming, while spatial separation had a minor effect on feed intake and yield, possibly due to overall high-quality pastures in early spring.

ACS Style

Lorena Carmona-Flores; Massimo Bionaz; Troy Downing; Muhammet Sahin; Long Cheng; Serkan Ates. Milk Production, N Partitioning, and Methane Emissions in Dairy Cows Grazing Mixed or Spatially Separated Simple and Diverse Pastures. Animals 2020, 10, 1301 .

AMA Style

Lorena Carmona-Flores, Massimo Bionaz, Troy Downing, Muhammet Sahin, Long Cheng, Serkan Ates. Milk Production, N Partitioning, and Methane Emissions in Dairy Cows Grazing Mixed or Spatially Separated Simple and Diverse Pastures. Animals. 2020; 10 (8):1301.

Chicago/Turabian Style

Lorena Carmona-Flores; Massimo Bionaz; Troy Downing; Muhammet Sahin; Long Cheng; Serkan Ates. 2020. "Milk Production, N Partitioning, and Methane Emissions in Dairy Cows Grazing Mixed or Spatially Separated Simple and Diverse Pastures." Animals 10, no. 8: 1301.

Original article
Published: 24 January 2020 in Grass and Forage Science
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Sainfoin (Onobrychis viciifolia Scop.) is one of the most drought‐tolerant perennial legumes that can thrive in dry, alkaline soils. A 3‐year study in the Central Anatolian Region of Turkey compared the persistence, productivity and nutritive value of sainfoin planted with nurse crops, namely Hungarian vetch (Vicia pannonica Crantz.) or triticale (× Triticosecale Wittm, ex A. Camus), at three seeding rates. Sainfoin and nurse crop emergence were significantly affected by the companion nurse crop, sowing rate and establishment year. The number of sainfoin plants at emergence was lower during a drier “bad” year (110 plant/m2) than in a “good” precipitation year (236 plant/m2). Triticale had a more negative impact on sainfoin growth than vetch. Planting nurse crops at high seeding rates (90 kg/ha) reduced the number of sainfoin seedlings as compared to the control, while the low seeding rate had little impact on sainfoin emergence. Planting sainfoin with triticale resulted in much greater yield exceeding 10 t/ha, but reduced the forage nutritive value compared to sainfoin monocultures and sainfoin–vetch mixtures. The seeding rate of the nurse crops during a dry year did not affect DM yield in the year of establishment nor in the following year. The findings of this study indicate that planting sainfoin with a nurse crop can substantially increase the DM yield in the year of establishment without yield penalties in the subsequent years, despite fewer established plants, as compared to sainfoin monocultures.

ACS Style

Harun Cicek; Serkan Ates; Gazi Ozcan; Mehmet Tezel; Jennifer G. Kling; Mounir Louhaichi; Gurhan Keles. Effect of nurse crops and seeding rate on the persistence, productivity and nutritive value of sainfoin in a cereal‐based production system. Grass and Forage Science 2020, 75, 86 -95.

AMA Style

Harun Cicek, Serkan Ates, Gazi Ozcan, Mehmet Tezel, Jennifer G. Kling, Mounir Louhaichi, Gurhan Keles. Effect of nurse crops and seeding rate on the persistence, productivity and nutritive value of sainfoin in a cereal‐based production system. Grass and Forage Science. 2020; 75 (1):86-95.

Chicago/Turabian Style

Harun Cicek; Serkan Ates; Gazi Ozcan; Mehmet Tezel; Jennifer G. Kling; Mounir Louhaichi; Gurhan Keles. 2020. "Effect of nurse crops and seeding rate on the persistence, productivity and nutritive value of sainfoin in a cereal‐based production system." Grass and Forage Science 75, no. 1: 86-95.

Review
Published: 16 December 2019 in Sustainability
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Managed temperate grasslands occupy 25% of the world, which is 70% of global agricultural land. These lands are an important source of food for the global population. This review paper examines the impacts of climate change on managed temperate grasslands and grassland-based livestock and effectiveness of adaptation and mitigation options and their interactions. The paper clarifies that moderately elevated atmospheric CO2 (eCO2) enhances photosynthesis, however it may be restiricted by variations in rainfall and temperature, shifts in plant’s growing seasons, and nutrient availability. Different responses of plant functional types and their photosynthetic pathways to the combined effects of climatic change may result in compositional changes in plant communities, while more research is required to clarify the specific responses. We have also considered how other interacting factors, such as a progressive nitrogen limitation (PNL) of soils under eCO2, may affect interactions of the animal and the environment and the associated production. In addition to observed and modelled declines in grasslands productivity, changes in forage quality are expected. The health and productivity of grassland-based livestock are expected to decline through direct and indirect effects from climate change. Livestock enterprises are also significant cause of increased global greenhouse gas (GHG) emissions (about 14.5%), so climate risk-management is partly to develop and apply effective mitigation measures. Overall, our finding indicates complex impact that will vary by region, with more negative than positive impacts. This means that both wins and losses for grassland managers can be expected in different circumstances, thus the analysis of climate change impact required with potential adaptations and mitigation strategies to be developed at local and regional levels.

ACS Style

Afshin Ghahramani; S. Mark Howden; Agustin Del Prado; Dean T. Thomas; Andrew D. Moore; Boyu Ji; Serkan Ates. Climate Change Impact, Adaptation, and Mitigation in Temperate Grazing Systems: A Review. Sustainability 2019, 11, 7224 .

AMA Style

Afshin Ghahramani, S. Mark Howden, Agustin Del Prado, Dean T. Thomas, Andrew D. Moore, Boyu Ji, Serkan Ates. Climate Change Impact, Adaptation, and Mitigation in Temperate Grazing Systems: A Review. Sustainability. 2019; 11 (24):7224.

Chicago/Turabian Style

Afshin Ghahramani; S. Mark Howden; Agustin Del Prado; Dean T. Thomas; Andrew D. Moore; Boyu Ji; Serkan Ates. 2019. "Climate Change Impact, Adaptation, and Mitigation in Temperate Grazing Systems: A Review." Sustainability 11, no. 24: 7224.

Journal article
Published: 07 April 2017 in Grass and Forage Science
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A 2-year study in the Central Anatolian Region of Turkey compared the performance of pasture-fed suckling lambs and their dams, set-stocked on grass-legume pastures supplemented either with forage legumes or concentrate through a creep grazing/feeding system in a randomized block design. The treatments included continuous pasture grazing + creep grazing alfalfa; continuous pasture grazing + creep grazing birdsfoot trefoil; continuous pasture grazing + creep feeding concentrate (170 g kg−1 CP; 11.3 ME MJ kg−1 DM); and continuous grazing without creep feeding (control). In both years, creep feeding/grazing commenced in early June following a 42-day pasture grazing period (period 1) and continued until mid-summer for two separate periods of 21 days each (periods 2 and 3). Creep-supplemented lambs grew faster (p < .001) than those that grazed pasture alone, with no significant difference across all creep supplementation treatments. Across the years, the lambs grew at 223 and 161 g per head day−1 for creep-supplemented and control groups respectively. None of the lamb feeding strategies affected the ewe liveweight gains (p > .05). Results from a bio-economic optimization model, however, showed that supplementing the pasture with birdsfoot trefoil and alfalfa in periods 2 and 3, respectively, maximized economic returns with an extra profit of US$88.83 per lamb above those that grazed the pasture alone.

ACS Style

S. Ates; G. Keles; Yigezu A. Yigezu; U. Demirci; S. Dogan; S. Isik; M. Sahin. Bio-economic efficiency of creep supplementation of forage legumes or concentrate in pasture-based lamb production system. Grass and Forage Science 2017, 72, 818 -832.

AMA Style

S. Ates, G. Keles, Yigezu A. Yigezu, U. Demirci, S. Dogan, S. Isik, M. Sahin. Bio-economic efficiency of creep supplementation of forage legumes or concentrate in pasture-based lamb production system. Grass and Forage Science. 2017; 72 (4):818-832.

Chicago/Turabian Style

S. Ates; G. Keles; Yigezu A. Yigezu; U. Demirci; S. Dogan; S. Isik; M. Sahin. 2017. "Bio-economic efficiency of creep supplementation of forage legumes or concentrate in pasture-based lamb production system." Grass and Forage Science 72, no. 4: 818-832.