Now showing items 4930-4949 of 20709

    • Dad Listens Better

      Kingdon, Lorraine B. (College of Agriculture, University of Arizona (Tucson, AZ), 1991)
    • Daily Forage Intake by Cattle on Natural Grassland: Response to Forage Allowance and Sward Structure

      Trindade, J.K.D.; Neves, F.P.; Pinto, C.E.; Bremm, C.; Mezzalira, J.C.; Nadin, L.B.; Genro, T.C.M.; Gonda, H.L.; Carvalho, P.C.F. (Society for Range Management, 2016)
      We investigated the hypothesis that not only forage allowance but also sward structure affects daily forage intake by beef heifers on natural grasslands of the Pampa Biome (southern Brazil). We used data from a long-term experiment, which has been managed by forage allowance levels since 1986. The objective was to investigate sward management targets that maximize daily forage intake. During January and December 2009, we evaluated the effect of forage allowance on forage mass, sward height and tussock frequency, and its consequences on dry matter intake (DMI). The experiment was arranged in a randomized complete block design with two replicates. Treatment was level of daily forage allowance (4, 8, 12, and 16 kg dry matter [DM] per 100 kg of animal body weight [BW]). Data were analyzed using regression, principal component analysis, and descriptive analyses from three-dimensional contour graphs with the data of sward structure, DMI, and DMI rate. Results demonstrated that DMI was positively correlated to forage allowance. However, higher levels of forage allowance can cause lower intake rates of forage and nutrients. We concluded that sward targets which promoted higher DMI and DMI rate were: daily forage allowance of ∼ 12 kg of dry matter per 100 kg of the animal's body weight, forage mass between 1 800 and 2 300 kg DM·ha-1, sward height between 11.5 and 13.4 cm, and tussock frequency lower than 30% of occurrence in the pastures. Within these targets, a high intake of nutrients was obtained, indicating the potential use of sward structure as a tool for managing natural grasslands in order to promote high intake of forage and nutrients by cattle. © 2016 Society for Range Management. Published by Elsevier Inc. All rights reserved.
    • Daily Versus Every-Third-Day Versus Weekly Feeding of Cottonseed Cake To Beef Steers On Winter Range

      Mcilvain, E. H.; Shoop, M. C. (Society for Range Management, 1962-05-01)
    • Daily Weather Record Furnished by Turner

      College of Agriculture, University of Arizona (Tucson, AZ), 1964
    • Dairy Herds Improve

      College of Agriculture, University of Arizona (Tucson, AZ), 1953
    • Dairy Husbandry at the U. of A.

      Trubey, R. B. (College of Agriculture, University of Arizona (Tucson, AZ), 1925-01)
    • Dairy Husbandry---Production & Technology

      Stull, J. W.; Dairy Husbandry (College of Agriculture, University of Arizona (Tucson, AZ), 1953)
    • Dairy Lab Remodeled

      Stull, J. W.; Department of Dairy Science (College of Agriculture, University of Arizona (Tucson, AZ), 1956)
    • Dairy Milks Energy Supply From Manure-Fed Bacteria

      College of Agriculture, University of Arizona (Tucson, AZ), 1983-12
    • The Dairy Outlook

      Davis, R. N. (College of Agriculture, University of Arizona (Tucson, AZ), 1927-03)
    • Dairy, Plant Breeding Get New Department Heads

      College of Agriculture, University of Arizona (Tucson, AZ), 1964
    • Dairying as a Factor in Arizona Agriculture

      Carns, A. G. (College of Agriculture, University of Arizona (Tucson, AZ), 1926-02)
    • A Dairyman's Trek to Europe

      Nelson, F. E.; Department of Dairy Science (College of Agriculture, University of Arizona (Tucson, AZ), 1966)
    • Dalapon Controls Johnson Grass And Bermuda Grass

      Hamilton, K. C.; Arle, H. F.; McRae, G. N.; Department of Agronomy and Range Management; Crops Research Division, Agricultural Research Service, USDA; Crops Research Division, Agricultural Research Service, USDA (College of Agriculture, University of Arizona (Tucson, AZ), 1958)
    • Dalea - Horticulturally Promising Legumes for Desert Landscapes

      Starr, Greg; Starr Nursery (University of Arizona (Tucson, AZ), 1988)
      Dalea is a member of the family Leguminosae which includes many commonly cultivated plants used in southwestern desert landscapes. With 166 described species, it is surprising to learn that until recently Dalea has largely been neglected horticulturally. In this paper I discuss seven promising species that have been tested in landscape situations for five years. These include six shrubs and one spreading groundcover. All except the groundcover are extremely showy when at the peak of flowering. Each species is unique and all are highly recommended for landscaping in arid regions of the world.
    • Dalhousie University Natural Radiocarbon Measurement II

      Ogden, J. Gordon; Hart, W. C. (American Journal of Science, 1977-01-01)
    • Dalhousie University Natural Radiocarbon Measurements I

      Ogden, J. Gordon; Hart, W. C. (American Journal of Science, 1976-01-01)
    • Damage from the larkspur mirid deters cattle grazing of larkspur

      Ralphs, M. H.; Jones, W. A.; Pfister, J. A. (Society for Range Management, 1997-07-01)
      The larkspur mirid (Hopplomachus affiguratus) is host specific to tall larkspur (Delphinium barbeyi Huth). These insects suck cell solubles from leaves and reproductive racemes, causing flowers to abort and leaves to desiccate. Cattle generally prefer lark spur flowering heads, pods, and leaves, and are frequently poisoned. The objective of this experiment was to determine if cattle would avoid eating mirid-damaged larkspur. A 2-choice cafeteria feeding trial was conducted to determine preference for mirid-damaged and undamaged larkspur. Four cows were offered a choice of the 2 types of larkspur in 10 min. feeding trials in the morning and evening for 5 days. Cows preferred the undamaged larkspur plants (0.8 kg +/- 0.08, SE) over mirid-damaged plants (0.1 kg +/- 0.03, SE). The cows were then turned out into a larkspur-infested pasture and consumption of mirid-damaged and undamaged larkspur was quantified by bite count. The cows did not select any mirid-damaged larkspur. Consumption of undamaged larkspur peaked at 17% of bites on the second day of the grazing trial, then declined as mirid damage on the plants increased. If the density of mirids on larkspur is sufficiently high to damage most of the leaves and flowering racemes, grazing by cattle may be deterred, and subsequent poisoning avoided.
    • Damage to Mesquite, Lehmann Lovegrass, and Black Grama by a Hot June Fire

      Cable, D. R. (Society for Range Management, 1965-11-01)
      Twenty-five percent of mesquite trees were killed on an area with Lehman lovegrass ground cover compared to 8% on an area with black grama. Ninety percent of black grama plants and more than 98% of lovegrass plants were killed. Many new lovegrass seedlings became established on both areas.