81 research outputs found
Efikasnost primene preparata na bazi zeolita u obrocima jagnjadi u tovu
The paper presents the results of a research on the impact of products based on natural zeolite on the production results of fattening lambs. The experiment involved two groups of lambs (the control - C and experimental - E groups), each consisting of 15 heads, for a period of 90 days. The meal was made from sheep milk, feed mixtures for fattening lambs and meadow hay. The test group lambs, unlike the ones from the control group, were given mixtures based on natural zeolite. Min-a-Zel S mixture (in the form of 25% composite) was fed to lambs from birth till their 14th day of life, directly into the mouth, once a day (before the morning feed), in the amount of 10 ml. Min-a-Zel Plus was given to them from their 15th day of life, together with the feed mixture (0.5%). Feeding was at will. The average weight of lambs at the end of the experiment, in accordance with the sequence of treatments (C:E) was 24.40:26.94 kg (P (lt) 0.01). Daily weight gain of lambs, during the experiment, was 229:256 g and in the experimental group it was by 27g or 11.79% higher (P (lt) 0.01). The test group lambs had a better utilization of dry matter, protein and energy, which justifies the use of products based on natural zeolite in fattening lambs.U radu su prikazani rezultati istraživanja o uticaju preparata na bazi prirodnog zeolita na proizvodne rezultate jagnjadi u tovu. Ogled je izveden na dve grupe jagnjadi (kontrolna - K i ogledna - O), po 20 jagnjadi u trajanju od 90 dana. Obrok se sastojao od ovÄjeg mleka, krmne smeÅ”e za tov jagnjadi i livadskog sena. IskoriÅ”Äavanje preparata na bazi zeolita (Min-a-Zel S i Min-a-Zel Plus) pozitivno je uticalo na prirast, iskoriÅ”Äavanje i efikasnost iskoriÅ”Äavanja suve materije, proteina i energije. ProseÄan dnevni prirast bio je veÄi kod jagnjadi ogledne grupe za 27 g ili 11,79 posto. UtroÅ”ak suve materije za kilogram prirasta u istoj gupi, bio je manji za 12,21 posto a proteina i energije za 10,58 posto. Manja uÄestalost javljanja proliva bila je kod jagnjadi ogledne gupe
Modern Approach to the Enigma of Bovine Respiratory Disease Complex: A Review
Research on bovine respiratory disease complex (BRDC) has strongly contributed to a better understanding of disease at both global and local levels. New agents have been identified and their nature has been better known since then, as well as all the factors that predispone the development of BRDC. Serious work in a number of researches has led to results that have proven significant synergistic interactions between viruses and bacteria that lead to the BRDC and complicate the prevention and treatment of the diseased cattle. Nowadays, it is necessary to apply the latest molecular and other techniques in order to examine in detail all of the specific causes, describe them accurately and provide effective prevention. This can primarily be accomplished by producing different types of vaccines, which are to be improved constantly. Serious progress has been made in researches on immunogenic properties and antimicrobial activity of various natural and synthetic substances in order to improve the production of more effective vaccines for control, as well as the development of a new generation of antibiotics to treat the disease. BRDC prevention programs have been successful, in which great importance was given to proper vaccinations and herd management practices. BRDC is still the most important disease of cattle from an economic point of view, since it causes great losses and expenses. (C) 2013 PVJ. All rights reserve
Electron transport data in N2-O2 streamer plasma discharges
A multi-term theory for solving the Boltzmann equation and a Monte Carlo simulation technique are used to investigate the electron transport in mixtures of molecular nitrogen and oxygen. We investigate the way in which the transport coefficients and spatially resolved transport data are influenced by the amount of O2 in the mixture. This study
was initiated in order to obtain the transport data for input into the fluid models and fluid components of hybrid models of streamers and has resulted in a database of such transport data
Uticaj kukuruzne silaže u obroku krava muzara na sadržaj kalcijuma, fosfora i magnezijuma u krvnom serumu
The amount of calcium, phosphorus and magnesium in milking cows, blood was tested and it is one of indicators that cows were fed with these substances. The average amount of calcium, phosphorus and magnesium in blood of milking cows was tested and it is one of indicators that cows were fed with these substances. The average amount of calcium in tested cows, blood is 2.82 mmol/l, the average amount of phosphorus is 1.66 and the average amount of magnesium is 1.29 mmol/l. Cows, were fed by corn silage, alfalfa hay, along with concentrate of standard mineral composition.Ispitivan je sadržaj kalcijuma, fosfora i magnezijuma u krvnom serumu krava, kao jednog od indikatora obezbeÄenosti životinja ovim elementima. ProseÄan sadržaj kalcijuma u krvnom serumu ispitivanih krava iznosio je 2.82 mmol/l, fosfora 1.66 mmol/l i magnezijuma 1.29 mmol/l seruma. Krave su hranjene kukuuznom silažom, senom lucerke i krmnom smeÅ”om za krave muzare
Uticaj zeolita na hemijski sastav mleka kod krava muzara domaÄe Å”arene rase
Milk yield and milk chemical composition are largely affected by the quality of dairy cattle diet. The chemical composition of milk is dependent upon a large number of factors, including breed, diet, care, housing system, stage of lactation, etc. Milk composition is primarily a breed-specific trait. This study was conducted over a period of 15 months, involving Serbian Spotted dairy cattle. The experimental animals were assigned to three groups, each receiving different levels of supplemental zeolite. The control group comprised cows that received no zeolite supplement. Experimental Groups I and II were fed compound feeds supplemented with 4% and 2% zeolite, respectively. Milk samples were analysed for the contents of milk fat, proteins, fat-free solids and lactose, and density. The results obtained suggest that zeolite supplementation affects milk chemical composition, depending on the zeolite level present in livestock feed.NajveÄi sadržaj mleÄne masti u mleku je izmeren kod krava I-O grupe 4,62%, zatim kod K-grupe 4,28% i najmanji kod II-O grupe 4,26%. StatistiÄki signifikantnih razlika u sadržaju mleÄne masti meÄu grupama je bilo (P (lt) 0,05). Nivo proteina u mleku krava bio je u intervalu od 3,34% kod krava II-O grupe do 3,51% kod krava kontrolne grupe. Krave K-grupe imaju najveÄi proseÄni sadržaj proteina u mleku ali i najveÄe varijacije u ovoj osobini. Na osnovu sadržaja proteina u mleku statistiÄki znaÄajnih razlika izmeÄu grupa nije bilo (P>0,05). ProseÄne vrednosti gustine mleka bile su u opsegu od 31,21% kod krava IIO grupe do 33,00% kod krava K-grupe. Kao i kod prethodne osobine i ovde je najmanja proseÄna vrednost merene osobine bila kod krava II-O grupe (31,21), sa isto tako, najmanjim koeficijentom varijacije meÄu grupama (3,01). Kod ove osobine uoÄene su statistiÄki znaÄajne razlike meÄu grupama (P (lt) 0,05). NajveÄi sadržaj SMBM u mleku imale su krave K-grupe sa iznosom od 9,56%, a najmanju krave II-O grupe 9,11%. NajveÄe variranje ove osobine je kod krava K-grupe, a najmanje kod krava I-O grupe sa iznosom od 2,51%. Sadržaj SMBM u mleku pokazao je statistiÄki znaÄajne razlike (P (lt) 0,05). Sadržaj laktoze u mleku krava bio je u intervalu od 5,01% kod krava II-O grupe do 5,26% kod krava K-grupe. Krave I-O grupe imale su koliÄinu laktoze koja se nalazila izmeÄu ove dve grupe. Sadržaj laktoze u mleku krava izmeÄu grupa pokazao je statistiÄki znaÄajne razlike (P (lt) 0,05). Dodavanje zeolita ('Tufozel') imalo je uticaja na hemijski sastav mleka kod ispitivanih krava muzara
Zeolit kao faktor poboljŔanja nekih proizvodnih osobina kod krava muzara
Milk yield and milk chemical composition are largely affected by diet quality. Natural zeolite has been successfully used in livestock production as a feed supplement for some types and categories of domestic animals. This experiment was conducted over a period of 15 months involving Domestic Spotted dairy cattle. The test animals were assigned to three groups, each receiving different levels of supplemental zeolite. The control group comprised cows that received no zeolite supplement. Experimental groups I and II were fed compound feeds supplemented with 4% and 2% zeolite, respectively. The production traits studied included the following milk performance traits: whole lactation length, milk and fat yields over whole lactations, milk and fat yields over standard lactations. The results obtained suggest that zeolite supplementation affects some production traits, depending on the zeolite level present in livestock feed.Kontrolna grupa krava imala je proseÄno trajanje laktacije od 312 dana, sa varijacijama od 300 do 360 dana. Ova grupa se po dobijenim rezultatima nalazi izmeÄu ostale dve grupe krava. StatistiÄke razlike u trajanju celih laktacija meÄu grupama su znaÄajne (P (lt) 0,05). Najniža proizvodnja mleka u celim laktacijama zabeležena je kod krava Kgrupe (6395,20 kg), viÅ”a kod krava I-O grupe (6714,13 kg) i najviÅ”a kod krava II-O grupe (6934,13 kg) koja je dobijala 2% zeolita preko krmnih smeÅ”a. StatistiÄke razlike u proizvodnji mleka u celim laktacijama meÄu grupama su vrlo znaÄajne (P (lt) 0,01). Najmanja proseÄna produkcija mleka zabeležena je kod krava K-grupe (6342,33 kg). Znatno veÄa proizvodnja je bila kod krava koje su dobijale zeolit. Krave I-O grupe dobijale su 4% zeolita i postigle su proseÄnu mleÄnost od 6690.86 kg. Krave II-O grupe dobijale su 2% zeolita i postigle su najveÄu proseÄnu mleÄnost od 6711.80 kg. Krave II-O grupe imale su najveÄu proseÄnu proizvodnju mleka u standardnim laktacijama i najniži koeficijent varijacije meÄu grupama. StatistiÄke razlike u proizvodnji mleka u standardnim laktacijama meÄu grupama su vrlo znaÄajne (P (lt) 0,01). Krave K-grupe imale su najmanju proseÄnu priozvodnju mleÄne masti u mleku, a krave II-O grupe najveÄu. StatistiÄke razlike u koliÄini mleÄne masti u celim laktacijama meÄu grupama su vrlo znaÄajne (P (lt) 0,01). TakoÄe su vrlo znaÄajne (P (lt) 0,01) i statistiÄke razlike meÄu grupama u koliÄini mleÄne masti u standardnim laktacijama
OdreÄivanje metaboliÄkog i hranidbenog statusa kod mleÄnih krava tokom poÄetka i sredine laktacije
The objective of the present study was to investigate nutritional and metabolic status in Simmental cows during early and mid-lactation. Fifteen early lactating cows and 15 mid lactating cows were chosen for the investigation. Blood samples were collected to measure beta-hydroxybutyrate (BHB), nonesterified fatty acids (NEFA), triglycerides (TG), glucose and the activity of aspartate transaminase (AST). Early lactation as compared to mid lactating cows were found to have significantly higher (P (lt) 0.05) blood serum concentrations of NEFA, BHB and AST and lower blood serum concentrations of glucose (P (lt) 0.05) and TG (P>0.05). Significantly negative correlations were observed between BHB and glucose (P (lt) 0.01), BHB and TG (P (lt) 0.05), NEFA and glucose (P (lt) 0.05). Significantly positive correlations were observed between NEFA and BHB (P (lt) 0.05), NEFA and AST (P (lt) 0.05), glucose and TG (P (lt) 0.01). The results suggest that these parameters can serve as useful indicators of the nutritional and metabolic status of dairy cows during lactation.Cilj ovog rada je bio da se ispita mataboliÄki i hranidbeni status mleÄnih krava simentalske rase za vreme rane laktacije i tokom sredine laktacije. 15 mleÄnih krava na poÄetku laktacije i 15 tokom sredine laktacije je odabrano za ispitivanje. Uzorci krvi su uzeti i merene su vrednosti za beta-hidroksi-buternu kiselinu (BHB), slobodne masne kiseline (NEFA), trigliceride (TG), glukozu i aktivnosti aspartat-amino transaminaze (AST). Krave na poÄetku laktacije su imale statistiÄki znaÄajno veÄe koncentracije (P (lt) 0.05) NEFA, BHB i AST u krvi i znaÄajno niže vrednosti za glukozu i trigliceride (P (lt) 0.05). StatistiÄki znaÄajne negativne korelacije su utvrÄene izmeÄu vrednosti BHB i glukoze (P (lt) 0.01), BHB i TG (P (lt) 0.05), NEFA i glukoze (P (lt) 0.05). StatistiÄki znaÄajne korelacije su utvrÄene izmeÄu NEFA i BHB (P (lt) 0.05), NEFA i AST (P (lt) 0.05), glukoze i TG (P (lt) 0.01). Rezultati ukazuju da ovi parametri krvi mogu biti korisni pokazatelji metaboliÄkog i hranidbenog statusa kod mleÄnih krava za vreme laktacije
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