Sirvi Autor "Jansons, I." järgi
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Kirje Application of microwave and infrared treatment to reduce antinutrients in lupine seeds(Estonian University of Life Sciences, 2025) Sterna, V.; Jansons, I.; Jansone, Z.; Zhylina, M.Lupins are group of legumes that produce seeds containing up to 40% protein, making them an excellent source of food or feed. However, the nutritional value of legumes can be adversely affected by the presence of various anti-nutrients, including phytic acid, alkaloids etc. The aim of this study was to evaluate the potential of microwave and infrared radiation to reduce the levels of anti-nutrients - alkaloids and urease activity - in lupine seeds. The seed treatment was carried out using two different applications - microwave with time regimes 2 minutes or 6 minutes and infrared toplight with time regimes: 10 minutes at 25 °C and 30 minutes at 35 °C. Content of protein, fat, amino acids, alkaloids and urease activity were determined. The results show that in the samples of lupins the alkaloid content decreased from 0.07% to 0.05% after 6 min of microwave treatment and from 0.07% to 0.03% after 10 min of infrared treatment. Concluded that both treatments reduced the content of alkaloids and urease activity in lupine seeds, without significantly changing either the protein content or the amino acid composition and can be used for antinutrient reduction without loss of nutrients.Kirje Effect of replacement of coated barley grain with hulless barley in diet on growth, carcass and meat quality traits of fattening pigs(2021) Degola, L.; Jansons, I.; Šterna, V.A amount of experimental pigs were 40 crossbred pigs (Yorkshire × Landrace). The initial body weight of pigs were average 27.0 kg. The goal of research was to assess the effect of replacement of coated barley grain with hulless barley in diet on pig growth, carcass and pork quality indices. Experimental groups of pigs on the holding were conducted according to age and sex. For trial group of pigs, a compound feed with hulless barley (38.9–45.4%) was prepared, for the control with coated barley (39.3–43.3%). The feed recipes made according the pigs age. The other feed ingredients were not changed and were wheat, soybean meal and oil, premivit, and from 20 till 70 kg liveweight also fish meal. Diets were formulated with the same of metabolizable energy and crude protein content. During the study the live weight of pigs was monitored and the feed consumption was counted. At the end of the study all pigs slaughtered, determined carcasses traits and took samples of loin muscle for chemical analyses. The results showed that pig fattening indices (daily liveweight gain were in control pig group 0.686 ± 0.183 and trial 0.716 ± 0.174) did not differ significantly between groups (P > 0.05), although its were slightly lower in the control group pigs by 4.37%. Feed consumption for live weight gain in both groups ranged from 3.14 to 3.25 kg. Carcasses scores showed significant differences in lean meat and chops (P < 0.05). There were also differences in the backfat thickness. The thickness of backfat was 2.62 mm less in the control pig group, which indicates that when feeding coated barley to fattening pigs, the carcasses have a higher proportion of lean meat (62.1 ± 0.7%). Pigs were slaughtered reaching a live weight of 110 to 114 kg. The meat yield 71.7% and moisture level (70.2–75.2%), as well as protein (22.3–22.9%) indicators showed that fattening pigs are sold at the optimal age. In conclusion, results from this study suggest that feeding hulless barley to fattening pigs results in higher live weight gain. Carcass indicators showed a significantly higher proportion of lean meat and weight of chops when pigs eating coated barley. Chemical composition of pork in groups without significant differences.Kirje Influence of local extruded soybean cake and imported soybean meal on fattening pig productivity and pork quality(2020) Jansons, I.; Degola, L.; Sterna, V.; Zute, S.The aim of this study was to determine the influence of feeding local and imported soybean protein feeds to fattening pigs and examining it impact on the quality of pork. The trial was created with 40 pigs divided in two groups (20 in each). Pigs in the control group received imported soybean meal, in the trial group local farm grown in Latvia extruded soybean cake mixed in the compound feed. The diets were designed to be nutritionally equivalent. For fattening pigs each diet were available on an ad libitum basis to pens. During the study pigs were weighed three times at 84, 140 and 190 days at age. Feed consumption, pig carcass traits and meat chemical composition were determined. The final live weight in control group was 108.33 ± 2.904 kg and in trial group was 111.88 ± 2.793 kg there were no significant difference (P > 0.05). Average daily live weight gain in the all experimental period in control group was 0.779 ± 0.096 kg and in trial group was 0.822 ± 0.103 kg, there were no significant difference (P > 0.05). Feed consumption per kg of live weight in control group was 2.39 kg in trial group was 2.24 kg. Pig carcass traits and meat chemical composition were similar for both groups without significant differences (P > 0.05). Soybeans grown and processed in Latvia were equivalent to imported soybeans and gives good rates of pig growth and quality of pork.Kirje The nutrition value of soybeans grown in Latvia for pig feeding(2019) Degola, L.; Sterna, V.; Jansons, I.; Zute, S.Soybean products are excellent sources of protein for pigs because their amino acid profiles complement those of cereal grains. Soy protein is rich in the limiting amino acids lysine, threonine, and tryptophan that are present in relatively low concentrations in the most commonly fed cereal grains. Amino acids in soy protein are more digestible than amino acids in most other plants proteins, which results in less nitrogen being excreted in the manure from pigs fed diets containing soybean meal than if other protein sources are used. The phosphorus in soy products is bound to phytic acid, which has a low digestibility to pigs, but the digestibility of phosphorus in soy products may be increased to more than 60% if diets are supplemented with microbial phytase. There are no much results about nutrition value of soybean growing in Latvia. Therefore the aim of study was determined chemical composition of soybeans growing in Latvia and evaluates their potential in pig feeding. Research object were soybeans growing in Latvia. In the studied samples content of protein, fat, ash, fibre, composition of amino acids were determined and metabolizable energy were calculated. Evaluated that protein content varied from 32.7 till 40.7%, fat content was from 18.4–21.4% and significantly differed (p < 0.05) among growing places, but the sum of essential amino acids in the soy beans determined 115–125 g kg-1 , and were not differed significantly by varieties. The content of lysine in protein were determined 5.1–5.5 g 100 g -1 . Concluded that soy bean growing in Latvia provides equilibrium high metabolizable energy for pigs – from 13.2 to 17.6 MJ kg-1 and could be used in feed.