Íslenskar landbúnaðarrannsóknir - 01.03.1969, Qupperneq 65

Íslenskar landbúnaðarrannsóknir - 01.03.1969, Qupperneq 65
EFNAINNIHALD OG MELTANLEIKI ÚTHAGAPLANTNA 63 S U M M A R Y THE CHEMICAL COMPOSITION AND DIGESTIBILITY OF SOME ICELANDIC RANGE PLANTS II RANGE STUDIES IN ICELAND Ingui Þorsteinsson and Gunnar Ólafsson, Agricultural Research Institute, Reykjavik, Iceland. The present paper deals with studies on the digestibility and chemical com- position of 10 common Ieclandic range plants which are listed in Table 1. The plant samples were collected at two locations in the lowlands, Hvann- eyri and Heiðmörk, in the periods May 1965 to June 1966. Each species was collected twice a month during the period May—September, and once a month during the winter, weather conditions permitting. Only current growth was sampled. The phenological stage of the species at each sampling date was recorded (Table 3). The samples were analyzed for crude protein, calcium, magnesium, phos- phorus and potassium. The digestibility of dry matter was determined by the In-Vitro method. The results are presented graphically on pages 50—62 and are percentages of dry matter. The results are briefly discussed. The main conclusions from these and previous studies (I’orsteinsson and Ólafsson, 1965) are: 1) There is a reduction in the digestibility of dry matter and the percentage of crude protein, phosphorus and potassium with increasing maturity of the plants. At the same time there is an increase in calcium and mag- nesium. 2) By the end of August the nutritive value of the range plants has become lower than desirable. 3) At that tirne all the species studied had reached maturity after a growing season of 2y2—3 months. HEIMILDARRIT Bliss, L. G., 1962: Adaptations of arctic and alpine plants to environmental conditions. Arctic, 15, 2. Breirem, K., 1957: Forelesninger i vitaminer og mineralstoffer ved Norges Landbruks- h0gskole (referat av O. B. Vagnild). Volle- bekk 1957. Dukes, H. H„ 1943: The physiology of dome- stic animals. Veöráttan 1965. Ársyfirlit, samið á Veðurstof- unni. Veðráttan 1966. Ársyfirlit, samið á Veðurstof- unni. hORSTEINSSON, Ingvi og ÓLAFSSON, Gunnar, 1965: Efnainnihald og meltanleiki nokk- urra úthagaplantna. llit Landbúnaðar- deildar, A-flokkur, 17.
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