فهرس المقالات Poa trivialis

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  1 - Determination of Nutritive Value of <i>Poa trivialis</i> Using <i>in vitro</i> Methods, Gas Production and Nylon Bag
  ف. میرزائی آقجه قشلاق ا. قربانی ع. مهدوی ب. نویدشاد س. کرامتی جبه‌دار
  This study was conducted to determine the chemical composition, metabolizable energy, digestibility and ability of gas production of Poa trivialis. Samples was collected at three phenological stages including: vegetative growth, flowering and seedling on two different e أکثر

  This study was conducted to determine the chemical composition, metabolizable energy, digestibility and ability of gas production of Poa trivialis. Samples was collected at three phenological stages including: vegetative growth, flowering and seedling on two different elevations of 1300 to 1500 m and 2000 to 1800 m asl in Neor and Hir region as the first and second sites, respectively. Testing of gas production was performed using Semi-automatic gas producers machine WT-Binder 87532 Model (made ​​in Germany). Fistulated castrated male sheeps were used for preparation of required rumen fluid. Results show that more crude protein and less cell wall were in the vegetative growth stage. Gas production was higher in the first stage in comparison with other growing stages. The amounts of gas production of soluble and insoluble structures at the first and second sites were 75.63 and 81.50 mL, respectively. Metabolizabe energy of Poa triviali was2.38 in the first site and in the second site 2.48 Mcal/kg DM in the vegetative growth stage. Collected samples from the second site had more metabolizabe energy, digestibility, degradability and gas production in comparison with the results of the first site. تفاصيل المقالة
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  2 - Studying the Impacts of Cold Temperature on Morphological and Phonological Development of Poa pratensis and Poa trivialis Regarding GDD
  Ebrahim Baghdadi Ali Ashraf Jafari Mohammad Ali Alizadeh Amir Hossain Gorji
  Poa genus has a high value for grazing and forage conservation concerning thelivestock. In order to study the impacts of cold temperature and Growing Degree Days(GDD) on seedling morphological trait and phonological development of two speciesinvolving Poa pratensis and أکثر

  Poa genus has a high value for grazing and forage conservation concerning thelivestock. In order to study the impacts of cold temperature and Growing Degree Days(GDD) on seedling morphological trait and phonological development of two speciesinvolving Poa pratensis and Poa trivialis, this research was conducted in laboratory andgreenhouse and outdoor of Research Institute of Forest and Rangeland in Tehran, Iran. Theseed samples were moist chilled at 4 &deg;C for two weeks as compared to the control treatment.Samples of both treatments (chilling and control) were transferred into a germinator at20&plusmn;4&deg;C for 15 days. All the pots were placed in a normal glasshouse at 20&plusmn;10&deg;C for onemonth. The 30th day age pots have been transferred into the cold rooms at 4&deg;C for two weeks incomparison with control treatment. The seedling vegetative traits were measured same as thelaboratory. For outdoor experiment, half of pots of greenhouse were transferred outdooruntil their flowering and growth stages and GDD were recorded. In the flowering stage,morphological characteristics including stem number, stem length, peduncle length,panicle length, plants‟ fresh and dry weight of each ecotype were recorded. The collecteddata of each experiment were separately analyzed using factorial experiment based oncompletely randomized design. The results of laboratory experiment showed thesignificant effects of chilling (4 &deg;C) treatment on germination percent, speed of germinationin both species and vigor index for P. pratensis. Regarding P. pratensis in vegetative stage,the mean values of all of traits were higher in control treatment than those of coldtreatment. Similarly, in outdoor experiment, the mean values of reproductive traits in thecontrol treatment were higher than those for cold treatment concerning both species. P.pratensis had higher mean values for all of reproductive traits as compared to P. trivialis.Results also showed that GDD of plants which were subjected to cold treatment werelower than those for control treatment for both vegetative and flowering stages. It has beenconcluded that cold treatment reduced flowering dates in reproductive stage. تفاصيل المقالة