The numerical analysis of cantilever beam structures filled using aluminium foam

KEGA 009STU-4/202

Effect of pre-stress on modification of modal properties of planar structures

The work has been supported by the following research projects VEGA 1/0796/20 and KEGA 009STU-4/2021

Rizikové faktory potravového reťazca V

Abstract In this study the effect of single cadmium, cadmium + selenium and cadmium + zinc administration on the ovarian structure of Japanese quails was studied. The morphometric analysis of the relative volume of primary follicles detected the highest value in control group with a similar value in the group with administration of cadmium with selenium. Lower relative volume is reported in group with cadmium and zinc administration and the group with simple cadmium administration (P<0.05). The relative volume of growing follicles was very similar in all studied groups (11.33 -15.35%), and the relative volume of stroma was very stable (82.59 -86.45%). In the evaluation of the number of follicles undergoing atresia significantly higher number of atretic primary follicles as well as growing follicles in the group with cadmium administration and cadmium with selenium administration in comparison with control group was found. In comparison of normal and atretic follicles we report the most negative effect on ovarian structure in group with cadmium administration. Selenium co-administration show protective effects but only the co-administration with zinc prevent significant cadmium ovarian alterations

Effect of pre-stress on modification of modal properties of planar structures

The work has been supported by the following research projects VEGA 1/0796/20 and KEGA 009STU-4/2021

The numerical analysis of cantilever beam structures filled using aluminium foam

KEGA 009STU-4/202

Influence of Salvia Officinalis Essential Oil on Digestion Parameters and Intestinal Microflora of Broiler Chickens

This study was aimed at the comparison of the effects of dietary applications of sage essential oil (Salvia officinalis L.) on some digestive enzyme activities in the chyme of the jejunum, digestive characteristics, and selected bacterial microflora in the caecum. Seventy, one-day-old broiler chickens (Ross 308) were allocated into two equal groups for 42 days. The feed mixture of the experimental group was supplemented with the essential oil at the level of 2.306 g.kg−1. This supplementation was absent in the control feed mixture. The main volatile compounds were analysed: Eucalyptol 85, alpha-thujon 148, betathujon 72, camphor 149 and borneol 37 g.kg−1. The digestive enzyme activities in the chyme of the jejunum increased as follows: amylolytic on days 16 (P < 0.01) and 29 (P < 0.001) as well as cellulolytic on days 16 (P < 0.05), 29 (P < 0.001), and 42 (P < 0.01). The proteolytic activity decreased on day 16 (P < 0.01). The intake of the additive, increased the digestibility of crude fibre (P < 0.01) on days 16, 29 and 42. The apparent assimilable mass coefficient of crude protein, corrected for protein catabolism, was increased in the experimental group on days 29(P < 0.05) and 42 (P < 0.01). The counts of Escherichia coli in the caecum decreased (P < 0.05) on days 29 and 42. The supplementation of chickens with the sage essential oil increased the crude fibre digestibility, the amylolytic and cellulolytic activities in the chyme of the jejunum, and decreased the counts of E. coli in the caecum

Effects of Feeding Low Protein Diets on Serum and Faeces Parameters in Weaned Piglets

This study was conducted to determine the effects of a low-protein diet supplemented with synthetic amino acids on the biochemical parameters in the blood serum, the indicators of fermentation processes, and nitrogen excretion in 12 crossbred piglets. The piglets (weaned at 28 days of age) were divided into two groups with 6 piglets each. The control group had an initial average body weight of 8.8 ± 0.6 kg and the experimental group with an average initial body weight of 8.6 ± 0.7 kg. The control diet contained 210.8 g.kg−1 crude protein and the experimental diet contained 186.4 g.kg−1. The experimental diet was supplemented with lysine, methionine and threonine to achieve a more ideal amino acid pattern. The blood collections from the sinus ophthalmicus for the determination of the biochemical parameters were performed 4 times at weekly intervals in the control and experimental groups 4—5 hours after feeding. The faeces were taken from the rectum at the end of the study period. The decrease in the dietary crude protein content of the experimental group was manifested by a significant decrease of the blood urea level (2.61 mmol.l−1 average concentration) compared to the control groups (4.21 mmol.l−1 average concentration) (P < 0.001). The other serum component concentrations (total protein, albumin, glucose, cholesterol, total lipids and selected enzymes) showed no significant statistical changes between the control and experimental groups. The results of the fermentation process analysis indicated that the butyrate concentration decreased (P = 0.0017) and the pH increased (P = 0.0180) in the experimental group compared to the control group. The levels of crude protein and ammonia in the faeces of experimental animals were significantly lower (P < 0.001) in comparison with those in the control animals