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Regional Study Of No-Till Impacts On Near-Surface Aggregate Properties That Influence Soil Erodibility, Humberto Blanco-Canqui, Maysoon M. Mikha, J. G. Benjamin, L. R. Stone, A. J. Schlegel, Drew J. Lyon, M. F. Vigil, P. W. Stahlman
Regional Study Of No-Till Impacts On Near-Surface Aggregate Properties That Influence Soil Erodibility, Humberto Blanco-Canqui, Maysoon M. Mikha, J. G. Benjamin, L. R. Stone, A. J. Schlegel, Drew J. Lyon, M. F. Vigil, P. W. Stahlman
Panhandle Research and Extension Center
The extent to which tillage systems modify the near-surface soil aggregate properties aff ecting soil’s susceptibility to erosion by water and wind is not well understood. We hypothesized that an increase in soil organic carbon (SOC) content with conservation tillage systems, particularly no-till (NT), may improve near-surface soil aggregate properties that infl uence soil erodibility. This regional study assessed changes in aggregate resistance to raindrops, dry aggregate wettability, and dry aggregate stability as well as their relationships with changes in SOC content. Four long-term (>19 yr) tillage systems including moldboard plow (MP), conventional till (CT), reduced till (RT), and …
Growing Rate Of Gain On Subsequent Feedlot Performance, Meat, And Carcass Quality Of Beef Steers, B. A. Loken, R. J. Maddock, M. M. Stamm, C. S. Schauer, Ivan G. Rush, S. Quinn, G. P. Lardy
Growing Rate Of Gain On Subsequent Feedlot Performance, Meat, And Carcass Quality Of Beef Steers, B. A. Loken, R. J. Maddock, M. M. Stamm, C. S. Schauer, Ivan G. Rush, S. Quinn, G. P. Lardy
Panhandle Research and Extension Center
Eighty Angus and Angus × Simmental steer calves were used in a completely random design to determine the effect of rate of BW gain during the backgrounding period on subsequent feedlot performance, carcass characteristics, Warner-Bratzler shear force (WBSF), and sensory analysis. Animals were stratified by BW and allotted randomly to 1 of 10 pens (5 pens/treatment). Dietary treatments were formulated for an ADG of 0.91 kg/d [low BW gain (LG), 1.06 Mcal of NEg/kg] diets and 1.25 kg/d [high BW gain (HG), 1.19 Mcal of NEg/kg]. Steers were fed 70 d during the growing period. The …
Of Ants And Elephants: Measuring Student Appreciation For Insects And Charismatic Megafauna During An African Safari, Jeffrey Bradshaw, Marlin E. Rice
Of Ants And Elephants: Measuring Student Appreciation For Insects And Charismatic Megafauna During An African Safari, Jeffrey Bradshaw, Marlin E. Rice
Panhandle Research and Extension Center
As part of an International Field Trip in Biology class through the Study Abroad Program at Iowa State University, we had as a goal to impress university students of various academic backgrounds with the insects of the Serengeti region in east Africa. The Matthiessen quote hints at our a priori expectation and main obstacle—wondrous distraction. The promoted goal of the field trip was to educate and expose students to the natural history of northern Tanzania, with a focus on the mammalian and avian fauna, the varied grassland-bushland-montane forest ecosystems, Rift Valley geology, and Maasai culture. The course, conducted during 2005, …
Development And Feeding Of Fall Armyworm On Miscanthus × Giganteus And Switchgrass, Jarrad R. Prasifka, Jeffrey Bradshaw, R. L. Meagher, R. N. Nagoshi, K. L. Steffey, M. E. Gray
Development And Feeding Of Fall Armyworm On Miscanthus × Giganteus And Switchgrass, Jarrad R. Prasifka, Jeffrey Bradshaw, R. L. Meagher, R. N. Nagoshi, K. L. Steffey, M. E. Gray
Panhandle Research and Extension Center
Observations of fall armyworm, Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae), larvae infesting plots of Miscanthus × giganteus Greef and Deuter ex Hodkinson and Renvoize prompted laboratory-based tests of survival, development, and feeding preferences on leaf tissue from M. × giganteus and switchgrass, Panicum virgatum L. Survival from hatch to pupation was >70 and 50% for fall armyworms reared on switchgrass and M. × giganteus, respectively, although survival of the S. frugiperda rice strain was significantly greater than the corn strain on both crops. Developmental times from hatch to pupation or adult emergence showed effects of crop and S. frugiperda …
A Comparison Of Melengestrol Acetate Fed At Two Dose Levels To Feedlot Heifers, G. E. Sides, J. T. Vasconcelos, R. C. Borg, O. A. Turgeon, W. C. Koers, M. S. Davis, K. Vander Pol, D. J. Weigel, C. M. Tucker
A Comparison Of Melengestrol Acetate Fed At Two Dose Levels To Feedlot Heifers, G. E. Sides, J. T. Vasconcelos, R. C. Borg, O. A. Turgeon, W. C. Koers, M. S. Davis, K. Vander Pol, D. J. Weigel, C. M. Tucker
Panhandle Research and Extension Center
A randomized complete block design was used to compare the effects of feeding melengestrol acetate (MGA) at 0.4 (0.4M) and 0.5 (0.5M) mg/d per head on feedlot performance, estrus activity, and carcass characteristics of commercial beef heifers (n = 1,418; 10 pens/ treatment). Within 48 h of arrival at the research site, heifers were assigned to treatment, processed according to feedlot protocol, and administered an abortifacient. After adaptation to a 95% concentrate diet, MGA was supplied at either 0.4 or 0.5 mg/head daily. Estrus activity was monitored twice daily and summarized as a count of heifers showing estrus within a …
Genetic And Molecular Characterization Of Vernalization Genes Vrn-A1, Vrn-B1, And Vrn-D1 In Spring Wheat Germplasm From The Pacific Northwest Region Of The U.S.A., Dipak K. Santra, M. Santra, R. E. Allen, K. G. Campbell, K. K. Kidwell
Genetic And Molecular Characterization Of Vernalization Genes Vrn-A1, Vrn-B1, And Vrn-D1 In Spring Wheat Germplasm From The Pacific Northwest Region Of The U.S.A., Dipak K. Santra, M. Santra, R. E. Allen, K. G. Campbell, K. K. Kidwell
Panhandle Research and Extension Center
The objective of this study was to determine the Vrn-1 allelic composition of spring wheat germplasm from the Pacific Northwest region of the USA. Individual plants from 56 spring wheat lines were crossed to near-isogenic tester lines carrying the dominant allele Vrn- A1, Vrn-B1 or Vrn-D1. F2 progeny were evaluated for growth habit in the field and Vrn-1 allelic composition was determined through chisquare analysis. Lines also were analysed with DNA sequence-based Vrn-1 allele-specific markers. A majority of the germplasm carried the dominant allele Vrn-A1a alone or in combination with Vrn-B1, Vrn-D1 or Vrn-B3 alleles. Vrn-B1 and Vrn-D1 were …
Effect Of Feeding Melengestrol Acetate, Monensin, And Tylosin On Performance, Carcass Measurements, And Liver Abscesses Of Feedlot Heifers, G. E. Sides, R. S. S. Swingle, J. T. Vasconcelos, R. C. Borg, W. M. Moseley
Effect Of Feeding Melengestrol Acetate, Monensin, And Tylosin On Performance, Carcass Measurements, And Liver Abscesses Of Feedlot Heifers, G. E. Sides, R. S. S. Swingle, J. T. Vasconcelos, R. C. Borg, W. M. Moseley
Panhandle Research and Extension Center
Approximately 4,000 yearling heifers (initial BW = 306 ± 1.9 kg) were randomly allotted into 4 treatment groups to determine the effect of melengestrol acetate (MGA) on feedlot performance and carcass parameters. Treatments included a diet containing monensin (Rumensin) and tylosin (Tylan; RT) fed during the entire feeding period; RT plus MGA (RTM) also fed during the entire feeding period; RT withdrawn 35 d preslaughter (RTwd); and RTM withdrawn 35 d preslaughter (RTMwd). All cattle were implanted at arrival with Revalor-IH and reimplanted with Revalor-200, and were fed a standard feedlot finishing diet (that met or exceeded 1996 NRC requirements) …