Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl
Ograniczanie wyników
Czasopisma help
Lata help
Autorzy help
Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 46

Liczba wyników na stronie
first rewind previous Strona / 3 next fast forward last
Wyniki wyszukiwania
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 3 next fast forward last
PL
Miód i inne produkty pszczele od najdawniejszych czasów należą do najbardziej cenionych środków spożywczych. Podstawą do wszechstronnego wykorzystania produktów pszczelich w żywieniu i leczeniu człowieka jest ich zróżnicowany i wyjątkowy sktad chemiczny, w tym zawartość licznych, charakterystycznych substancji o działaniu bioaktywnym. W artykule omówiono wybrane właściwości biologiczne i lecznicze produktów pszczelich, tj. miodu, mleczka pszczelego, pyłku kwiatowego, pierzgi, propolisu i jadu pszczelego. Znajdują zastosowanie zwłaszcza w przemyśle spożywczym, ale także kosmetycznym i farmaceutycznym oraz medycynie.
EN
Honey and other bee products have always been found among highly valued foods. The basis for the comprehensive use of bee products in nutrition and treatment of human is their diverse and unique chemical composition, including content of numerous, specific biologically active substances. In the article, the selected biological and medicinal properties of bee products, such as: honey, royal jelly, pollen, bee bread, propolis and bee venom, were discussed. They are employed especially in the food industry, but also in the cosmetic and pharmaceutical sectors, and in medicine.
PL
Celem pracy była ocena jakości mleka towarowego pozyskiwanego w gospodarstwach stosujących różne systemy doju, tzn. ręczny lub mechaniczny (konwiowy, przewodowy, hala udojowa). W analizie wykorzystano dane z dokumentacji zakładowej 5 spółdzielni mleczarskich działających na terenie województwa lubelskiego, uzyskane z oceny 121 872 prób mleka. Uwzględniono dane z poszczególnych miesięcy (od stycznia do grudnia) w latach 2008-2009, dotyczące zawartości tłuszczu (%), białka (%), ogólnej liczby drobnoustrojów (tys./ml) i liczby komórek somatycznych (tys./ml). Wykazano, że stosowany system doju, który w dużym stopniu dostosowany jest do wielkości stada krów, a co za tym idzie, powiązany z technologią produkcji mleka w gospodarstwie, istotnie wpływa na jakość produkowanego mleka towarowego. Stwierdzono istotnie wyższą (p≤0,01) zawartość tłuszczu w mleku pozyskiwanym we wszystkich formach doju mechanicznego, a białka tylko w mleku z hali udojowej. Najlepsze pod względem mikrobiologicznym było mleko pozyskiwane w halach udojowych i za pomocą dojarek bańkowych (OLD przeciętnie ok. 45 tys./ml), a nieco gorsze przy doju ręcznym (47 tys./ml) i za pomocą dojarek przewodowych (49 tys./ml). Mleko pozyskiwane w doju ręcznym zawierało ponad dwukrotnie mniej komórek somatycznych (108,6 tys./ml) w porównaniu do surowca z pozostałych analizowanych systemów doju (194,2-251,9 tys./ml).
EN
The aim of this work was to evaluate the quality of market milk obtained from farms, employing diverse systems of milking, i.e. manual or mechanical (bucket, pipeline, milking parlour). The data acquired from the evaluation of 123 872 milk samples was used to analyze the works documentation of 5 dairy cooperatives from Lublin voivodeship. The data from each month (January to December) from 2008 to 2009 concerning the contents of fat (%), protein (%), total bacterial count (thousand/ml) and somatic cell count (thousand/ml) were considered. It has been demonstrated that the system of milking, which in a high degree is connected with a size of cow herd and, what follows, is linked with technology of milk production in farms, has a significant impact on quality of manufactured market milk. The study showed significantly (p≤0.01) higher amount of fat in milk obtained from all mechanic systems of milking. What is more, only higher level of protein was found in the milk from milking parlours. The best milk in respect of the total bacterial count (TBC) was the milk obtained from milking parlours and bucket systems of milking (approximately 45 thousand/ml). The milk from manual (47 thousand/ml) and pipeline milking systems (49 thousand/ml) was slightly worse. The milk obtained from manual milking contained around two times lower somatic cell count (108.6 thousand/ml) in comparison to the raw material from other analyzed systems of milking (194.2-251.9 thousand/ml).
EN
The aim of the study was to determine the performance of four Polish breeds of goats and to evaluate the impact of αs1 -casein genetic variants on milk, fat, protein yields and casein content. The investigations included a total of 598 goats of four breeds, i.e. white improved, colour improved, white non-improved and colour non-improved. Goat productivity was established in relation to milk yield, fat and protein and the percentage of these components. Additionally, each goat’s milk was sampled to establish the fat, protein and casein content and to determine milk as1-casein genotype. As far as the αs1 -casein genotypes were concerned, the animals were assigned into two groups: strong, including variants AA, AB, AE, BE and medium . EE. It was found that the improved goats compared to the non-improved generally obtained higher scores for milk yield and, in turn, fat and protein. The concentration of the basic milk components was also highest in colour improved goats, whilst the protein/fat ratio most beneficial in white improved animals. It was ascertained that strong αs1 -casein variants tend to promote higher concentrations of the basic milk components, i.e. fat, protein and casein. In the group of animals characterized with the highest fat concentration (over 5%), protein (over 3.2%) and casein in particular (over 2.4%), animals with strong αs1 -casein genotypes clearly predominated in all four breeds of goats.
EN
The aim of the research was to compare milk productivity parameters of goats having different αs₁-casein genotypes from two breeding regions in Poland. 745 goats of four breeds (white and coloured improved, white and coloured common) raised in two breeding regions in Poland, i.e. Podkarpacie and Wielkopolska were studied and their daily yield of milk was compared in relation to the genetic variants of αs₁-casein. It was found that the daily milk yield of goats raised in the Podkarpacie region was higher and had a superior chemical composition compared to that of the goats from the Wielkopolska region. Additionally, in the summer season (regardless of production region and breed) the goats produced milk with higher protein content, including casein. The analysis of the genetic αs₁-casein in relation to the goats’ performance did not indicate its significant influence on milk yield. Nonetheless, there seemed to be a significant tendency for strong variants to have an impact on a higher concentration of the basic milk components, i.e. protein (mainly casein) and fat.
EN
Concentration of toxic metals in milk, especially in industrial regions, may serve as a direct bioindicator of the quality of milk and its products. But it can also function as an indirect indicator of contamination of the environment where milk is produced. The aim of the present study was to evaluate the content of some trace elements, i.e. Fe, Cu, Zn and Mn, as well as toxic elements (Cd and Pb) in milk from cows maintained on farms in three regions of Poland, including the production season as another aspect of the investigations. In total, 446 milk samples were analyzed. Significant influence of the season and production region on all the analyzed elements except Fe was noticed. Milk collected in the Biebrza and Bieszczady regions proved to be a richer source of Cu and Mn. Regardless of the production region, a higher content of Zn and Cu were observed in the summer, while more Mn was found in the winter milk. In none of the analyzed milk samples, Pb or Cd exceeded the permissible threshold.
EN
The aim of study was to evaluate the chemical composition, including mineral content, in milk of different breeds maintained in organic and traditional farms using intensive (PMR) and traditional feeding systems. The study was carried out on 47 farms in south-eastern Poland. A total of 735 milk samples were analysed, including 263 from cows raised on organic farms, 218 from cows raised on conventional farms using a traditional feeding system, and 254 from cows raised on conventional farms using an intensive feeding system (PMR). All types of farms raised Polish Holstein-Friesian and Simmental cows, and the conventional farms using a traditional feeding system also kept Polish Red and White-Backed cows. The highest (p ≤ 0.01) daily milk yield and content of protein, lactose, dry matter and urea in the milk were obtained from the cows fed in the PMR system. The highest fat content was noted for the milk from the conventional farms using a traditional feeding system. The animals raised in the organic system produced the least milk, with the lowest concentrations of its basic nutrients. The highest mineral content was noted for the milk from the traditional system. The milk from the organic system contained the least Ca, Na, Mg, Zn and Fe, while the milk from the intensive system contained the least Mn. The content of Cu was similar in the milk from the organic and intensive systems and lower (p ≤ 0.01) than in the milk from the traditional system. The results of two-way analysis of variance indicate that the breed of cow significantly influenced milk yield, protein content, protein-to-fat ratio, Ca and Zn concentration (p ≤ 0.01), and the content of dry matter, Fe and Mn in the milk (p ≤ 0.05).
EN
The content of macro- and microelements in milk depends on a variety of environmental, genetic and physiological factors. The aim of the study was to determine the effect of the region of production and stage of lactation, associated with the production season, on the content of selected macro- and microelements, including potentially toxic elements, in goat milk. The material consisted of goat milk samples collected from farms in two regions of Poland: 74 samples from central-eastern Poland (the Provinces of Lublin and Świętokrzyskie) and 149 from southern Poland (the Bieszczady mountains). The milk was collected in three seasons: winter (75 samples), summer (111) and autumn-winter (37). In each milk sample, the percentage of casein, protein, fat, lactose and dry matter was determined, as well as the concentrations of K, Ca, Na, Mg, Zn, Fe, Cu and Mn. K, Ca, Na, Mg and Zn using a Varian 240FS AA spectrometer, by the flame atomic absorption technique, while Fe, Cu and Mn were determined in a graphite furnace with the Zeeman background correction, using a Varian 240Z AA spectrometer. The goats’ production peak was in the summer, when they were at pasture. From mid-lactation they produced milk with significantly (p ≤ 0.01) higher concentration of components. Milk obtained in stage I of lactation (winter feeding) was the richest source of Zn, Fe and Cu, while stage II milk (summer feeding) had the highest K content, and stage III milk (autumn-winter feeding) had the highest content of Ca, Na, Mg and Mn. Concentration of Zn, Fe and Cu decreased over the course of lactation. Milk obtained in the Bieszczady mountain region had significantly (p ≤ 0.01) higher content of dry matter, fat and protein. It also contained significantly (p ≤ 0.01) more Ca, Na, and Mg, and less K and Zn in comparison with the milk of the goats raised in central-eastern Poland. The highest positive correlation coefficients were noted between the content of Ca and Mg, Zn and Fe, Zn and Cu, Na and Mg, and Fe and Cu, while K content was negatively correlated with that of Na, Ca and Mg (p ≤ 0,001).
EN
The purpose of this study was to compare the haematological profile and meat colour of calves slaughtered in summer and autumn. The material covered 42 calves chosen randomly i.e. 22 slaughtered in summer (June-August) and 20 in autumn (October-December). Haematological analyses included haematocrit (HCT), haemoglobin level (HGB), red blood cells (RBC), white blood cells (WBC) and platelets (PLT). The morphology of the erythrocytes and platelets, and differentiation of leucocytes were examined. The colour of meat was evaluated instrumentally by Minolta CIE L*a*b* and haematin pigment content was determined. The blood haemoglobin content in calves in the compared seasons was similar (11.3 g/L) and found within a normal range. Blood of calves from the autumn season showed higher HCT, RBC, and MCV values with concurrent lower MCH and MCHC values in comparison to the summer season. Blood of calves slaughtered in summer showed a higher content of WBC and a significantly higher percentage of lymphocytes as against blood of calves from the autumn. Meat of calves from the summer season was paler (higher L* value), and had a significantly (p ≤ 0.05) higher proportion of yellowness (b*). A brighter colour of meat from calves presented for slaughter in the summer season was noted along with a lower content of haematin pigments. Significant correlations were found between haematological variables (HGB, HCT and RBC, particularly) and haematin pigment content and meat lightness (L*) and redness (a*).
first rewind previous Strona / 3 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.