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Thomas L. Welker
Agricultural Research Service
11Publications
6H-index
158Citations
Publications 11
Newest
#1Thomas L. Welker (ARS: Agricultural Research Service)H-Index: 6
#2Ken Overturf (ARS: Agricultural Research Service)H-Index: 24
Last.Frederic T. Barrows (ARS: Agricultural Research Service)H-Index: 28
view all 7 authors...
ABSTRACTTo determine the effects of feed processing method (extrusion or expansion followed by compression pelleting) on feed physicochemical characteristics, fecal stability, water quality, and growth performance in rainbow trout, three types of feed pellets (expanded sinking [EpS], extruded sinking [ExS], extruded floating [ExF]) were prepared, analyzed, and fed to juvenile rainbow trout (initial weight = 285.8 ± 15.2 g) at three feeding rates based on feeding rate curves developed at Snake Ri...
1 CitationsSource
#1Thomas L. Welker (ARS: Agricultural Research Service)H-Index: 6
#2Ken Overturf (ARS: Agricultural Research Service)H-Index: 24
Last.Gibson T. Gaylord (FWS: United States Fish and Wildlife Service)H-Index: 3
view all 5 authors...
3 CitationsSource
#1Thomas L. Welker (ARS: Agricultural Research Service)H-Index: 6
#2Frederic T. Barrows (ARS: Agricultural Research Service)H-Index: 28
Last.Wendy M. Sealey (FWS: United States Fish and Wildlife Service)H-Index: 17
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Rainbow trout (23.1 ± 0.4 g) were fed either a fishmeal- or plant-based diet supplemented with various levels of zinc (0, 15, 30, 60 or 120 mg kg−1) for 12 weeks. Trout fed the fishmeal diet had significantly higher weight gain than with the plant-based diet. Zinc supplementation in the fishmeal diet had no effect on growth performance, suggesting that additional dietary supplementation of zinc is not required. However, in trout fed the plant-based diet, growth increased significantly up to 30 m...
6 CitationsSource
#1Jason Abernathy (ARS: Agricultural Research Service)H-Index: 3
#2Stéphane Panserat (INRA: Institut national de la recherche agronomique)H-Index: 46
Last.Ken Overturf (ARS: Agricultural Research Service)H-Index: 24
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Growth hormone (GH) transgenic salmon possesses markedly increased metabolic rate, appetite, and feed conversion efficiency, as well as an increased ability to compete for food resources. Thus, the ability of GH-transgenic fish to withstand periods of food deprivation as occurs in nature is potentially different than that of nontransgenic fish. However, the physiological and genetic effects of transgenic GH production over long periods of food deprivation remain largely unknown. Here, GH-transge...
3 CitationsSource
#1Yao-bei-ping Zhang (AAU: Anhui Agricultural University)H-Index: 1
#2Yi-bin Zhou (AAU: Anhui Agricultural University)H-Index: 2
Last.Keshun Liu (ARS: Agricultural Research Service)H-Index: 2
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Six types of Chinese tea were incorporated into diets at four different levels (0, 1, 2 and 4 %) in order to determine their effects on the growth performance, fatty acid composition of muscle lipids and resistance to Aeromonas hydrophila infection of Ictalurus punctatus (channel catfish) fingerlings. Each diet was fed to catfish in triplicate tanks for 8 weeks. Results show that a 1 % Dragon Well tea (DWT) and Maofeng tea were significantly better than other diets (including the control) in imp...
6 CitationsSource
#1Thomas L. Welker (ARS: Agricultural Research Service)H-Index: 6
#2Chhorn Lim (ARS: Agricultural Research Service)H-Index: 31
Last.Keshun Liu (ARS: Agricultural Research Service)H-Index: 2
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The effects of distiller's dried grains with solubles (DDGS) from different sources on growth performance, hematology, and immunity of hybrid tilapia, Oreochromis niloticus × Oreochromis aureus, were evaluated. Sex-reversed, all-male hybrid tilapia (3.72 ± 0.08 g initial weight) were fed diets in which 30% of protein in the control diet, supplied by a combination of soybean meal (SBM) and corn meal (CM) (SBM : CM ratio = 1.8), was replaced by wheat DDGS (WtDDGS), sorghum DDGS (SDDGS), whiskey DD...
5 CitationsSource
#1Erchao Li (ECNU: East China Normal University)H-Index: 24
#2Chhorn Lim (ARS: Agricultural Research Service)H-Index: 31
Last.Thomas L. Welker (ARS: Agricultural Research Service)H-Index: 6
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The effects of dietary linoleic (LA) and linolenic acids (LN) on growth and immunity of allmale hybrid tilapia, Oreochromis niloticus ×Oreochromis aureus, were evaluated for 10wk. Fish fed 0.12% LA + 0% LN had the lowest weight gain (WG) but was not significantly different from diets containing 0.5% LA or 0.40% LA + 1.0% LN. Fish fed 1% LA had the highest WG but did not differ from diets with 0.5% LA, 2.0% LA, 0.26% LA + 0.5% LN, 0.69% LA + 2.0% LN, or diets containing both LA and LN at 0.25, 0....
24 CitationsSource
#1Kunthika Vechklang (Suranaree University of Technology)H-Index: 1
#2Chhorn Lim (ARS: Agricultural Research Service)H-Index: 31
Last.Chokchai Wanapu (Suranaree University of Technology)H-Index: 3
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This study was conducted to evaluate the effect of dietary levels of Brewtech dried brewers yeast (BY) and GroBiotic-A (GB) on growth performance, proximate body composition, immune response, and resistance of juvenile Nile tilapia to Streptococcus iniae challenge. A practical basal (control) diet formulated to contain approximately 32% crude protein and 6% lipid was supplemented with 1% and 2% of BY or GB. Each diet was fed to Nile tilapia in quadruplicate aquaria for 12 weeks. Weight gain, fee...
6 CitationsSource
#1Chhorn Lim (ARS: Agricultural Research Service)H-Index: 31
#2Mediha Yildirim-Aksoy (ARS: Agricultural Research Service)H-Index: 11
Last.Menghe H. Li (MSU: Mississippi State University)H-Index: 22
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Growth, immunity, and resistance of Nile tilapia to Streptococcus iniae challenge were evaluated after feeding diets supplemented with vitamin C (0, 100, 2000 mg/kg) and E (0, 50, 500 mg/kg) for 12 wk. Supplementation of 100 mg vitamin C/kg to the basal diet was sufficient to increase growth and feed efficiency. The amount of vitamin E present in the basal diet (23.1 mg/kg) was sufficient to promote good growth and feed efficiency, but adding 50 mg vitamin E/kg was necessary to increase survival...
23 CitationsSource
#1Chhorn Lim (ARS: Agricultural Research Service)H-Index: 31
#2Mediha Yildirim-Aksoy (ARS: Agricultural Research Service)H-Index: 11
Last.Phillip H. Klesius (ARS: Agricultural Research Service)H-Index: 44
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Abstract A study was conducted to determine the effect of dietary levels of lipid and vitamin E on growth performance, immune responses and resistance of Nile tilapia to Streptococcus iniae challenge. A basal purified diet (35% protein and 3.4 kcal DE/g) supplemented with 6, 10 and 14% of 1:1 mixture of corn oil and menhaden fish oil was each supplemented with 50, 100 and 200 mg vitamin E/kg. Each diet was fed to Nile tilapia in triplicate aquaria for 12 weeks. Weight gain, feed intake and survi...
79 CitationsSource
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