Sirvi Autor "Ilgaza, A." järgi
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Kirje Comparative effect of different amount of inulin and symbiotic on growth performance and blood characteristics 12 weeks old calves(Estonian University of Life Sciences, 2021) Ilgaza, A.; Arne, A.The study was focused on assessment of the effect of prebiotic inulin (from Jerusalem artichoke (JA) powder it contain ~50% of inulin) and mixed with probiotic preparation call synbiotic thereof on growth performance and blood parameters of milk calf. In total, 70 milk calves (50+/-5 kg; 23+/-5 d.old) were used in a 57-d experiment. The seven dietary treatments consisted of the control diet (CoG); diet CoG supplemented with different amount of prebiotics (PreG6; PreG12; PreG24; accordingly 6g, 12 or 24 g of JA) and three different amount of synbiotics (SynG6; SynG12; SynG24; accordingly inulin and probiotic 0.25 g Enterococcus faecium (2×109 CFU g-1 ). Throughout the study prebiotic (PreG) and synbiotic (SynG) groups calf average daily gain (ADG) was increased (p < 0.01) than CoG, the end of study the highest ADG reached PreG12 than SynG12 and it was (p < 0.01) compare with CoG. At the end of te study PreG6 and SynG6;12 hematocrit was higher (p < 0.05), but PreG12;24 and SynG24 (p < 0.01) than CoG. Hemoglobin PreG and SynG12;24 was higher (p < 0.01) compare with CoG. WBC was lower (p < 0.05) PreG24, but there were no differences between synbiotic groups (SynG) compare CoG. PLT was (p < 0.01) higher PreG and SynG supplemented groups than CoG. Total protein PreG12; SynG6;12 (p < 0.01) higher compare CoG. Glucose PreG6;12 is lower (p < 0.05) than CoG. In conclusion, 12g and 24g of JA powder and the same amount ja powder mixed with probiotic Enterococcus faecium can improve the 4 to 12 weeks old calf performance and health status. However, new synbiotic didn’t improve inulin action.Kirje The effect of synbiotic inulin and enterococcus bacteria on digestive health and weight gain in calves(2021) Arne, A.; Ilgaza, A.The aim of study was to investigate the effect of a synbiotic containing Enterococcus bacteria and 3 different concentrations of inulin on the performance and health status of calves. Forty randomly selected healthy male Holstein crossbreed calves 23 (+/- 5) days old and weighing 50 kg (+/- 5 kg) were randomly allocated to 4 groups: control group (CoG n = 10) fed only whole milk, and 3 synbiotic supplemented groups: 1) SynG6 n = 10, 2) SynG12 n = 10, 3) SynG24 n = 10, in which calves received various amounts of prebiotic inulin (artichoke powder 6 g, 12 g, and 24 g) with 0.25 g of the probiotic Enterococcus faecium (2×10 9 CFU g -1 ). At the end of this study all three synbiotic group weight gains were significantly greater than the control group (p < 0.01). SynG12 (12 g artichoke powder) group's weight gain was significantly greater than control and the 6g and 24 g synbiotic groups (p < 0.05). The average cold carcass weight results were similar to the live weight results: SynG12 was significantly (p < 0.05) higher than SynG6 and SynG24. Supplementing feedings with this combination of the synbiotic containing 6 g of inulin (produce in Latvia) mixed with Enterococcus (Protexin, UK) bacteria (SynG12) was most effective in achieving the greatest daily weight gain and cold carcass weight.Kirje The effects of microalgae (Tetradesmus obliquus, Spirulina platensis and Chlorella vulgaris) on the nutritional profile of broiler meat(Estonian University of Life Sciences, 2025) Freiberga, A.; Ilgaza, A.; Jonova, S.; Eglite, S.; Gorbacevska, D.; Plivca, A.; Neiberts, K.; Zolovs, M.; Semjonovs, P.This study investigated the effect of dietary supplementation with three edible microalgae species (Tetradesmus obliquus, Spirulina platensis, and Chlorella vulgaris) on the nutritional profile of broiler chicken meat. Ross 308 broilers were fed a standard diet enriched with 0.5% of one of the microalgae species over a 43-day fattening period. Meat samples from the breast and thigh muscles were collected on days 35 and 43 to analyse its nutritional profile. Although no statistically significant differences were observed in growth performance, several biologically differences became apparent. C. vulgaris administration was associated with an initial increase in thigh meat fat content on day 35, followed by a notable reduction by day 43, and led to higher protein and polyunsaturated fatty acid levels. However, it resulted in the highest omega-6/omega-3 ratio among the groups. S. platensis contributed to a more favorable fatty acid profile, with the lowest omega-6/omega-3 ratio and increased protein levels, particularly in breast meat. T. obliquus supplementation produced leaner meat, improved vitamin B12 content, and maintained a more balanced omega-6 to omega-3 ratio by day 43, suggesting a cumulative benefit with prolonged feeding. These findings indicate that each microalga has species-specific effects on broiler meat quality, supporting their potential use as sustainable functional feed ingredients tailored to specific nutritional goals in poultry production.Kirje Reduction of ammonia emissions by applying probiotics on litter in a commercial breeding poultry house(2021) Eglite, S.; Ilgaza, A.; Butka, M.Agricultural sectors account for a part of total ammonia emissions, including poultry. This is especially true in breeding poultry houses, where birds live on litter for several months. The purpose of the research was to reduce ammonia emission and to improve birds living environment. The study was performed in two breeding poultry houses: the test house (ProLG) and the control house (ConLG). The study starts when young breeding birds (Ross 308) are housed at 19 weeks of age until the birds are eradicated at 60 weeks of age. At the test house the probiotic mixture in a powder form was manually spread 10 g per m2 before the birds were placed, and it was spread manually once a week on litter and over manure pits throughout the lifetime 5 g per m2 of probiotic mixture. The amount of ammonia in ProLG and ConLG houses was measured in the fifth week after the start of the study and afterwards every four weeks at the same 6 points each time and the condition of the litter was assessed on a 5-point scale. As the age of the poultry increases, the number of measurements also increases. Electricity consumption was calculated every month for the test housing and for the control housing. The trial is still ongoing, initial results showed that amount of ammonia has decreased compared to the control house, indicating that the probiotics can be used efficiently to reduce ammonia in the manure of the birds and improving the microclimate in poultry houses, but subsequent results did not give the expected results - the efficacy of probiotics had not been yet approved.Kirje Whey permeate-derived milk acidifier for dairy calves(Estonian University of Life Sciences, 2022) Antone, U.; Eihvalde, I.; Liepa, L.; Ilgaza, A.; Zolovs, M.; Liepins, J.A milk acidifier obtained from whey permeate fermenting it with dairy propionic acid bacteria was tested in this study to evaluate the effects of milk acidification on the health and growth performance of pre-weaned dairy calves. The study consisted of 30 neonatal Holstein female calves, allocated to three treatments fed unacidified (Control group) or acidified (EG-1 and EG-2 groups) pasteurised milk during the 7–75 day age. Control and EG-1 were fed milk by divided method three times daily till one month of age, then twice daily until weaning; EG-2 was basically fed by the undivided method - one week three times daily (7–14 day age), then once daily. Results demonstrate that animal general health status and faecal scores (FS) were good and the tested acidifier can be used for pre-weaned calf milk acidification. Biochemical and haematological indices of blood at the 30 and 60 day age were within normal reference values with both - divided and undivided - milk feeding methods. Mean live weight (LW; 106.6 ± 9.40 kg on average) and live weight gain (LWG; 911.33 ± 109.04 g day-1 on average) at weaning did not differ between treatments (P > 0.05). Lower intake of starter feed associated with a larger amount of milk consumed was observed in EG-2 animals (P < 0.05). As the results observed regarding growth performance and health indices of all dietary treatment groups of calves were similar, we could anticipate that the acidification benefits would be greater when providing unpasteurised milk, or during the hottest weather when the risks of milk spoilage are greater.