Articles by Author: D D Parkin

Search results for D D Parkin

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  1. Carcass mass gains of steers grazing star grass, with different stocking rates and levels of applied nitrogen

    Carcass mass gains of steers grazing star grass, with different stocking rates and levels of applied nitrogen

    Carcass mass gains of steers grazing dryland Cynodon aethiopicus cv. No. 2 Star grass pastures during the growing season were determined for each of 16 treatments comprising four levels of nitrogen fertilisation in combination with four overlapping sets of stocking...
  2. Effects of eight grazing systems on carcass mass gains of steers grazing irrigated <em>Cynodon aethiopicus</em> pastures

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Eight grazing systems were compared on irrigated Cynodon aethiopicus pastures which received 650 kg N, 36 kg P and 200 kg dolomitic limestone/ha, annually. There were either one, two, three, six or 18 paddocks in the systems, the single paddock...
  3. Preliminary evidence suggests extra-pair mating in the endangered echo parakeet, <em>Psittacula eques</em>

    Preliminary evidence suggests extra-pair mating in the endangered echo parakeet, <em>Psittacula eques</em>

    Item type: Journal Article • Journal: African Zoology
    Parrots are generally considered monogamous, forming strict pairs when breeding. Echo parakeets are unusual in that, although traditional breeding pairs occur, there are also multi-male breeding groups. This raises questions about the potential for extra-pair copulations. Genotype data were obtained...
  4. Preliminary insights into the level of genetic variation retained in the endangered echo parakeet (<em>Psittacula eques</em>) towards assisting its conservation management

    Preliminary insights into the level of genetic variation retained in the endangered echo parakeet (<em>Psittacula eques</em>) towards assisting its conservation management

    Item type: Journal Article • Journal: African Zoology
    This study examined a suite of microsatellite markers, originally developed for other parrot species, for their usefulness in providing details about the amount of genetic variation that has been retained in the endangered echo parakeet of Mauritius. Biological samples were...