Baigiamajame darbe 2012–2013 m. tirta netikrosios miltligės (Peronospora viciae (Berk) Caspary) įtaka skirtingos geografinės kilmės miškinio pelėžirnio (Lathyrus sylvestris L.) cenopopuliacijų morfologiniams ir sėklų produktyvumo rodikliams. Darbo objektas – iš skirtingų Lietuvos rajonų surinktos dvylika miškinio pelėžirnio cenopopuliacijų, augančių vienodos agrotechnikos sąlygomis. Darbo tikslas – įvertinti netikrosios miltligės įtaką skirtingų cenopopuliacijų miškinio pelėžirnio morfologinias ir sėklų produktyvumo rodikliams. Darbo metodai – įvertinti skirtingų miškiniopelėžirnio cenopopuliacijų stiebo aukštis, žiedynų, ankščių, sėklapradžių ankštyje skaičius, ankšties produktyvumo, vieno stiebo sėklų produktyvumas. Atsparumas netikrajai miltligei įvertintas 5 balų sistema, atsparumo įtaka ankščiau išvardintiems rodikliams įvertinta naudojantis programa STATISTIKA 8. Rezultatai. Tyrimo metų duomenimis, miškinio pelėžirnio stiebo aukščiui, žiedynų skaičiui ir ankščių produktyvumui lemiamą įtaką turėjo cenopopuliacijos genotipas ir tyrimo metų meteorologinės sąlygos. Didesnis miškinio pelėžirnio stiebo aukštis teigiamai įtakojo ankščių (r=0,7539) ir sėklų skaičių (r = 0,6223). Stabiliausias iš tirtų rodiklių tyrimo metais buvo sėklapradžių (vid. 12,4 vnt.) skaičius ankštyje (V = 4,7), labiliausi – ankščių (vid. 21,6 vnt.; V = 36,5) ir subrandintų sėklų skaičiaus (vid. 151,1 vnt., V = 39,8) rodikliai. Miškinio pelėžirnio atsparumas netikrajai miltligei įtakojo... [toliau žr. visą tekstą] / Influence of downy mildew (Peronospora viciae (Berk) Caspary) on morfological and seed productivity parameters of different geographical origins flat pea (Lathyrus sylvestris L.) cenopopulations have been investigated in 2012-2013. Subject of the research – 12 flat pea (Lathyrus sylvestris L.) cenopopulations from different geographical origins of Lithuania, grown on equal agrotechnic conditions. Aim of the research – estimate an influence of downy mildew on flat pea morfological and seed produktivity parameters. Methodology – to evaluate stem height, number of inflorescence, pods, ovules per pod and pod productivity, one stalk of seed productivity of different flat pea coenopopulations. Resistance to downy mildew is rated by 5-point scale, impact of resistance on above listed parameters estimated using the statistics program STATISTICA 8. Results. The research data shows, that genotype of coenopopulation and meteorological conditions had a decisive influence on flat pea stem height, number of inflorescences and pod productivity. Height of stem influenced positively pod (r = 0,7539 ) and seed number (r = 0,6223 ). The most stabile from the investigated parameters were number of ovules (mean 12,4 pcs.) per pod (V = 4,7 ), most labile – number of pods (mean 21,6 pcs., V = 36,5 ) and the number of mature seeds (mean 151,1 pcs., V = 39.8). The flat pea resistance to downy mildew influenced such parameters as the number of pods, number ovules in pod and especially stem seeds... [to full text]

Two experiments were conducted with sheep to determine the nutritional value of 'Lathco' flatpea (Lathyrus sylvestris) hay. In experiment 1, a finishing trial was conducted with 50 group fed crossbred lambs (25 ewes and 25 wethers) fed diets consisting of 70% chopped forage and 30% ground corn grain for 70 d. Five pens of five wethers and five pens of five ewes were selffed diets in which the forage consisted of 100:0, 75:25, 50:50, 25:75, and 0:100 proportions of alfalfa (Medicago sativa L.) and flatpea hay. Feed efficiencies decreased linearly (P<.05) as flatpea increased in the diet. Linear decreases (P<.05) were obtained in kidney and pelvic fat, backfat, leg conformation, and yield grade with increased flatpea in the diet. Blood urea-N (BUN), ruminal pH and NH3-N increased (P<.005) as proportion of flatpea increased. Total volatile fatty acid (VFA) and acetate concentration decreased linearly (P<.005) and propionate, isovalerate, and valerate levels increased linearly (P<.01) with increased proportions of flatpea hay. In experiment 2, 30 wether lambs were fed diets consisting of 100:0, 75:25, 50:50, 25:75 and 0:100 proportions of chopped alfalfa and flatpea hays in a digestion trial. Neutral detergent fiber (NOE), acid detergent fiber (ADE), cellulose, hemicellulose and energy digestibilities decreased linearly (P<.01) with increased levels of flatpea hay. Nitrogen retention was not different between sheep fed the different diets. Apparent absorbtion and retention of Ca decreased linearly (P<.05) with increased level of flatpea hay Ruminal pH and NHa-N, and BUN increased linearly (P<.OOl) as flatpea was increased in the diet. Ruminal total VEA, acetate and acetate to propionate ratio decreased linearly (P<.001) and propionate, isobutyrate, isovalerate, and valerate levels increased linearly (P<.001) as level of flatpea increased. / Master of Science