99 research outputs found
Prof. dr. sc. Ivan KneževiÄ (Osijek, 21. studenog 1940. - Osijek, 5. listopada 2023.)
Dana 5. listopada 2023. godine preminuo je naÅ” dragi prof. dr. sc. Ivan KneževiÄ, redoviti profesor u miru. Utihnulo je srce velikog Äovjeka, znanstvenika i profesora. Svoju profesorska osobnost na poseban naÄin znao je dijeliti s radnim kolegama, a naroÄito s mlaÄim suradnicima. Krasile su ga dobrota, blagost, kreativnost, motivacija, odluÄnost i pozitivnost
Lacto-corder - a new measurement device for cow milk productivity control
Lacto-Corder je mjerni ureÄaj za kontrolu proizvodnosti i izuzimanje uzorka mlijeka krava, službeno priznat od strane ICAR-a (Internacional Committee for Animal Recording). UreÄaj se sastoji od dva dijela: hidrauliÄkog koji obuhvaÄa put mlijeka kroz mjerno podruÄje i elektronoskog dijela koji obuhvaÄa upravljaÄko podruÄje gdje se unose i spremaju podatci. ProizvoÄaÄ je posebnu važnost dao muznim svojstvima (prosjeÄnom i maksimalnom protoku mlijeka), kao i grafiÄkom prikazu svih faza mužnji (pripremnoj, glavnoj, slijepoj i naknadnoj). PoÄetna ulaganja u kupnju opreme su velika. MeÄutim, sve informacije do kojih možemo doÄi ovim ureÄajem brzo bi opravdale uložena sredstva. Na Poljoprivrednom fakultetu u Osijeku u tijeku je znanstveno istraživanje s Lacto-Corderom Äiji je cilj detaljnije prouÄavanje muznih svojstava i njihova povezanost sa zdravljem vimena krava.LactoCorder is a new measurement device for cow milk productivity control and sample isolation. As a measurement device it has been recognized by ICAR (Internacional Committee for Animal Recording) and is used as an official control device in a German province ā Bavaria, The device is composed of two parts: hydraulic one including milk flow through the measuring area and electronic part comprising operational area where data is input and stored. Producer paid special attention to milking traits (average and maximun milk flow) as well as graphicall display of each part of the milking phase: preparation, basic, blind and additional one. Initial equipment purchase investments are large ones. However, taking into account available information obtained by this device invested means would be profitable wery soon. The Faculty of Agriculture in Osijek has been started a scientific ā investigation project aimin at study milking traits and their correlation with cows udder health
Use of internet in agriculture
Internet je skup raÄunalnih mreža koje po odreÄenom protokolu omoguÄuju komunikaciju velikog broja raÄunalnih sustava Å”irom svijeta. Äovjek u svakodnevnom radu teži proÅ”iriti informacije korisne za svoje usavrÅ”avanje i obrazovanje. Internet, kao globalna svjetska raÄunalna mreža, pruža novu kvalitetu u moguÄnostima komuniciranja i razmjene podataka. Posebno vrijedan izvor brzo dostupnih i toÄnih inforamcija smatraju se on-line baze podataka, koje su važne i u poljoprivrednim istraživanjima.Internet is a group of computer nets, which by certain protocol enables the communication of a large number of computer systems all over the world. Man in his daily work tries to widen information useful for his improving and education. Internet, as a global world computer net, gives a new quality to communication possibilities and data exchange. A very valuable source of quickly accessible and accurate information are on-line databases, which can be very significant in research work in agriculture
RazliÄitosti u muznim, mlijeÄnim i zdravstvenim svojstvima kod krava u proizvodnji mlijeka ovisno o rednom broju laktacije
The aim of this study was to determine the differences in milkability, milk and health traits in Holstein and Simmental dairy cattle due to parity. Following traits were analysed: milkability (duration of milking, MT; milk yield per milking, MYM; maximal, MMF and average milk flow, AMF), milk traits (daily milk yield, DMY; daily fat content, DFC; daily protein content, DPC; daily lactose content, DLC; urea, UREA) and health traits (logarithmic somatic cell count, SCClog and teatend hyperkeratosis, TEH). Significant (p<0.05; p<0.01; p<0.0001) differences between parity in MYM, DMY, MMF, DPC and DLC was determined. Also, significant (p<0.0001) difference in the teat-end hyperkeratosis score were found between cows in 1st and 2nd as well as between cows in 1st and ā„3rd parity. The cows in 1st and 2nd parity had similar SCClog, while significant (p<0.05) difference was found between SCClog in cows in 1st and cows in ā„3rd parity. The obtained results indicate that the parity significantly affect the milkability, milk and health traits. Since the hyperkeratosis level is highly correlated to the mastitis incidence risk, the regular teat-end scoring should be used in order to ensure quality machine milking and to minimize mastitis incidence risk.Cilj rada bio je utvrditi razliÄitosti u muznim, mlijeÄnim i zdravstvenim svojstvima krava simentalske i holstein pasmine ovisno o rednom broju laktacije. Analizirana su sljedeÄa svojstva: muzna (trajanje mužnje, MT; koliÄina mlijeka po mužnji, MYM; maksimalni, MMF i prosjeÄni protok mlijeka, AMF), svojstva mlijeka (dnevna koliÄina mlijeka, DMY; dnevna koliÄina masti, DFC; dnevna koliÄina proteina, DPC; dnevna koliÄina laktoze, DLC; urea, UREA) i zdravstvena svojstva (logaritmirani broj somatskih stanica, SCClog; hiperkeratoza vrhova sisa, TEH). UtvrÄen je visoko signifikantan (p<0,05; p<0,01; p<0,0001) razlika u: MYM, DMY, MMF, DPC i DLC izmeÄu svih laktacija. TakoÄer je utvrÄena visoko znaÄajna (p<0,0001) razlika u hiperkeratozi vrhova sisa izmeÄu krava u 1. i 2., te izmeÄu krava u 1. i ā„3. laktaciji. Krave u prvoj i drugoj laktaciji imale su približno isti broj SCClog, meÄutim znaÄajnost (p<0,05) je utvrÄena izmeÄu SCClog kod krava u prvoj i krava u treÄoj i ostalim laktacijama. Rezultati istraživanja ukazuju na to da redni broj laktacije znaÄajno utjeÄe na muzna, svojstva mlijeka i zdravstvena svojstva. BuduÄi da je razina hiperkeratoze jako povezana s rizikom od nastanka mastitisa, potrebno je redovito ocjenjivati vrhove sisa kako bi se osigurala kvalitetna mužnja a ujedno i smanjio rizik od nastanka mastitisa
The Analysis of Variability of Indicators Associated with Prevalence of Subclinical Ketosis/Acidosis in Dairy Cattle
Metabolic disorders of dairy cows, primarily ketosis and acidosis, are one of the most significant
problems in dairy herd management. Numerous studies have shown that metabolic disorders
induce economic losses for milk producers due to treatment costs, reduced milk production,
impaired reproduction, and ultimately increased animal excretion rates. Given the above, and for
the purpose of sustainable management of the dairy herd, it is extremely important to detect as
early as possible the cows that are at risk of subclinical metabolic disorders and to prevent the
development of the clinical form in time. On dairy farms, milk recording is performed every
month, which includes the collection of data on the productivity of dairy cattle that are in the
system of breeding and selection work. The results of milk recording together with the pedigree
data, the basis for calculating the breeding value of cattle and for the implementation of selection
in accordance with the breeding program of each breed, also allow the breeder to improve dairy
herd management and timely detection of metabolic disorders in the subclinical phase using
precision dairy farming technologies. The daily content of milk fat and protein represents the basis
for estimating the prevalence, with the optimal values of the ratio of milk fat and protein being
1.1 - 1.5, while the deviation from the same indicates the prevalence of acidosis or ketosis. The aim
of this study was to determine the prevalence of subclinical disorders of Simmental and Holstein
cows depending on the season by applying precision dairy farming technologies- that is, the results
of milk recording. Our logical control dataset consisted of over 1.6 million of test day records
(Holstein cows: 805,247 records/ 69,368 animals/ 4,998 farms; and Simmental cows: 845,514
records/ 78,540 animals/ 7,242 farms). Conducted analysis indicated that daily milk production,
stage of lactation, parity, age at first calving, milk recording, and cattle breed significantly affected
daily fat and protein content as well as F/P ratio. Also, determined higher values of F/P ratio in
winter period indicates higher ketosis prevalence risk, while lower values of F/P ratio in summer
period indicates higher acidosis prevalence risk. Finally, in order to more precisely predict the
ketosis / acidosis prevalence in dairy cows based on milk recording data, factor that significantly
affects the variability of daily fat and protein content, and consequently the fat to protein ratio as
well as the prevalence risk of metabolic disorders should be taken into account
Utjecaj vrijednosti temperaturno-humidnog indeksa na dnevnu proizvodnju mlijeÄnih goveda
The objectives of this study were to determine the microclimatic conditions in stables in three climactic regions (East, Mediterranean, and Central) of Croatia as well as to evaluate the effect of temperature-humidity index (THI) values on the daily production of dairy cattle. With that purpose, 1675686 test-day records collected from January 2005 until April 2010 were extracted from HPA (Croatian Agricultural Agency) database. For estimation of the effect of THI on daily production of dairy cows fixed-effect model that took into account the effects of lactation stage, breed, calving season, measuring season, and THI group (T1 - THIā¤72; T2 - THI>72) was used. Model was applied to each class of parity (P1, P2, P3, P4 and P5) and region. During the analysed period, the highest monthly averages of ambient temperature were determined in Mediterranean region, the highest monthly averages of relative humidity were observed in Central region, while the highest monthly mean values of temperature-humidity index (THI) were determined in Mediterranean region. Heat stress conditions indicated with mean daily values of THI>72 were determined during spring and summer season in all analysed regions. Absence of heat stress conditions during autumn and winter season also characterised all three regions. Highly significant (P72). Model je apliciran zasebno po razredima redoslijeda laktacije (P1, P2, P3, P4 i P5) te regije. Tijekom analiziranog razdoblja, najviÅ”e prosjeÄne mjeseÄne vrijednosti ambijentalne temperature utvrÄene su u mediteranskoj, najviÅ”e prosjeÄne mjeseÄne vrijednosti relativne vlage utvrÄene su u centralnoj, dok su najviÅ”e prosjeÄne mjeseÄne vrijednosti temperaturno-humidnog indeksa (THI) utvrÄene u mediteranskoj regiji. Toplinsko stresni uvjeti indicirani prosjeÄnom dnevnom vrijednoÅ”Äu THI>72 utvrÄeni su tijekom proljetne i ljetne sezone u svim analiziranim regijama. Odsustvo toplinsko stresnih uvjeta tijekom jesenske i zimske sezone karakteriziralo je sve tri regije. Visoko signifikantan (P<0.01) pad dnevne koliÄine mlijeka te dnevnog sadržaja mlijeÄne masti i bjelanÄevina uzrokovan poviÅ”enom vrijednoÅ”Äu THI utvrÄen je u svih grla neovisno o redoslijedu laktacije te u svim klimatskim regijama. Nadalje, najizraženiji negativni utjecaj toplinskog stresa utvrÄen je u istoÄnoj regiji. Tijekom razdoblja toplinskog stresa, s ciljem minimalizacije utjecaja istog, neophodna je prilagodba managementa u stadu mlijeÄnih grla. UzgajivaÄima su na raspolaganju razliÄiti alati za borbu protiv toplinskog stresa. Na primjer, hlaÄenje okoliÅ”a omoguÄuje unos dostatne koliÄine krmiva dok prikladan sastav obroka osigurava dostatan unos hranjiva. Navedeno omoguÄava održavanje optimalne proizvodnje mlijeka
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