67 research outputs found
ZnaÄaj koriÅ”Äenja omega-3 masnih kiselina u ishrani ljudi i životinja
Life of modern people in urban conditions is characterized by lack of movement, which is main condition for maintenance of health, presence of large amount of additives and pesticide residua in food of plant and animal origin and polluted air and water. If the presence of oxidative stress is added as part of normal metabolism occurring during degradation of nutritive substances, when great quantity of free radicals is released, which organism in these conditions often is not capable of neutralizing, the homeostatic mechanisms are disturbed and this leads to health disturbances and even severe illnesses. In such complex living conditions, science is facing the challenge of finding out the way to prevent diseases and slow the aging process using food, primarily basic food stuffs - milk and meat, enriching them with certain substances which are of vital importance to our health. One of the ways is use of functional food which should contain not only its main nutritive value but also such ingredients which have impact on improvement of general health condition, i.e. they have preventive and therapy effect. In this paper, a review of the significance of omega-3 fatty acids in human nutrition is presented. As essential substances they cannot be synthesized in the organism, but have to be introduced through diet. Also, the significance of some essential omega-6 fatty acids as well as their mutual relation, are presented. The role of omega-3 fatty acids in animal nutrition is also pointed out in this paper, introduced or consumed by animals either by grazing or as diet supplement, which influence improvement of their production, reproduction and health performances.Život savremenog Äoveka u urbanim uslovima karakteriÅ”e nekretanje kao osnovni uslov zdravlja, prisustvo velike koliÄine aditiva i rezidua pesticida u hrani biljnog i animalnog porekla, zagaÄeni vazduh i voda. Ako se tome doda i prisustvo oksidativnog stresa kao deo normalnog metabolizma koji se deÅ”ava pri razlaganju hranljivih materija, pri Äemu se oslobodi velika koliÄina slobodnih radikala, koje organizam u ovakvim uslovima Äesto nije sposoban da potpuno neutraliÅ”e, dolazi do naruÅ”avanja homeostatskih mehanizama koje Äesto dovode do naruÅ”avanja zdravlja pa i do najtežih bolesti. U ovakvim složenim uslovima življenja, izazov nauke je da pronaÄe naÄine kako da putem hrane, pre svega osnovnih životnih namirnica mleka i mesa, obogaÄujuÄi ih pojedinim materijama koji su od vitalnog znaÄaja za naÅ”e zdravlje, utiÄe na spreÄavanje bolesti i usporavanje procesa starenja. Jedan od naÄina je i koriÅ”Äenje funkcionalne hrane koja pored osnovne hranljive vrednosti treba da sadrži i takve sastojke koji utiÄu na popravljanje opÅ”teg zdravstvenog stanja, odnosno deluju preventivno i terapeutski. U radu je na revijalan naÄin predstavljen znaÄaj omega-3 masnih kiselina u ishrani ljudi koje kao esencijalne materije ne mogu da se sintetiÅ”u u organizmu, veÄ moraju da se unesu putem obroka. TakoÄe, ukazano je i na znaÄaj pojedinih esencijalnih omega-6 masnih kiselina kao i meÄusoban odnos ovih dveju kiselina. Pored toga, istaknuta je uloga omega-3 masnih kiselina u ishrani životinja koje ih unose ili putem paÅ”e ili kao dodatak obroku, a one utiÄu na popravljanje njihovih proizvodnih, reproduktivnih i zdravstvenih performansi
Proizvodnja juneÄeg mesa sa svojstvima funkcionalne hrane
In this study the effects of 'Tradi-Lin' as a source of omega-3 fatty acids (FA) in diets for fattening cattle were presented. 'Tradi-Lin' produced from flax seed had 58% omega-3 and 15% omega-6 fatty acids of total polyunsaturated fatty acids (PUFA). Trial was carried out on three groups of finishing beef cattle (C, T1 and T2) with 15 heads in each and was lasted 60 days. The diets used based on maize silage and concentrate mixture. Cattle received 0, 300 and 700 g of 'Tradi-Lin' per day, respectively. At the end of trial heads were slaughtered and major parameters of the chemical composition and meat quality were determined. The results indicated that were no differences in saturated (50.85; 50.21; 50.34%) and unsaturated (49.15; 49.79; 49.66%) FA between treatments in intramuscular fat of the m. longissimus dorsi but 'Tradi-Lin' influenced the changes in structure of intramuscular fat and increased PUFA from 4.91 (C) to 5.54 (T1) and 7.31% (T2) ( P (lt) 0.05). The increase of omega-3 FA from 0.36 (C) to 0.60 (T1) and 0.76% (T2) must be pointed out, ( P (lt) 0.05). The omega-6 FA were also increased from 4.51 (C) to 4.94 (T1) and 6.22% (T2) (P>0.05) but omega-6: omega- 3 ratio was reduced from 12.25 (C) to 8.22 (T1) (P (lt) 0.05) and 8.62(T2), (P (lt) 0.01). Trans unsaturated FA which are undesirable were decreased from 3.37% (C) to 2.43% (T1) and 2.36% (T2)(P (lt) 0.05). From nutritional aspect those results have a great importance, having in mind that omega-3 FA have a vital role in human health.U radu su predstavljeni efekti koriÅ”Äenja proizvoda 'Tradi-Lin' kao izvora omega-3 masnih kiselina u obrocima junadi u tovu. Proizvod 'TradiLin'dobijen je termiÄkom obradom semena lana, sadrži 58% omega-3 i 15% omega-6 masnih kiselina od ukupno polinezasiÄenih masnih kiselina (PUFA) i predstavlja patent francuske firme Vitalac. Ogled je izveden na tri grupe simentalske rase junadi (C, T1 i T2) sa po 15 grla u svakoj, u periodu dva meseca pred klanje. Obroci za sve grupe junadi bili su potpuno identiÄni i bazirani na silaži cele biljke kukuruza i smeÅ”i koncentrata. Jedina razlika bila je ta Å”to su grla pored osnovnog obroka dobijala 0, 300 i 700 g 'Tradi-Lin' -a dnevno, respektivno. Na kraju ogleda grla su zaklana i odreÄeni su najvažniji parametri hemijskog sastava i kvaliteta mesa. Dobijeni rezultati ukazuju da u intramuskularnoj masti leÄnog dela M. longissimus dorsi (MLD) nije postojala razlika u sadržaju zasiÄenih (50,89; 50,21; 50,32%) i nezasiÄenih (49,15; 49,79; 49,66%) masnih kiselina meÄu ispitivanim tretmanima (C, T1 i T2). MeÄutim, dodavanje 'TradiLin'- a uticalo je na promenu strukture intramuskularne masti u korist poveÄanja PUFA od 4,95 (C), na 5,98 (T1) odnosno 7,31% (T2) (P (lt) 0.05). Treba posebno istaÄi poveÄanje sadržaja omega-3 masnih kiselina sa 0,36 (C) na 0,60 (T1) odnosno na 0,76% (T2), (P (lt) 0,05). Jednovremeno poveÄao se sadržaj omega-6 masnih kiselina od 4,51 (C) na 4,94 (T1) odnosno 6,22% (T2) (P>0,05) a odnos omega -6/omega-3 smanjen sa 12,25 (C) na 8,22 (T1) (P (lt) 0,05) i 8,62 (T2), (P (lt) 0,01). Sadržaj trans nezasiÄenih masnih kiselina koje su nepoželjne smanjen je sa 3,37% (C) na 2,43% (T1) (P (lt) 0,05) odnosno 2,36% (T2). Dodavanje 0,7 kg ovog preparata u obroke u zadnjih dva meseca tova potpuno je ekonomski opravdano jer utiÄe na zanemarljivo poveÄanje cene u odnosu efekte koji se dobijaju. Sa nutricionistiÄkog aspekta ovi rezultati imaju veliki znaÄaj imajuÄi u vidu da omega-3 masne kiseline imaju vitalnu ulogu u oÄuvanju zdravlja ljudi
Selekcija bikovskih majki u populaciji simentalske rase goveda
Increase of production and improvement of the quality of milk, as well as of the intensity of fertility, are main prerequisites of modern cattle production. For the purpose of production of domestic Simmental bulls it is necessary to select the best cows from main herd. These heads as a rule represent approx. 1% of best cows in the controlled population primary in regard to production of milk and milk fat, but also in regard to body development, udder development and fertility traits. Fertilization of bull dams is done according to adequate system, where, for each dam, annually, bull, previously selected as sire, is determined, whose semen will be used for her insemination. Since the fastest way for selection and genetic progress is sire-son line, the most attention is directed to selection of bull sires. In Serbia, annually, only very few bulls are tested, which is insufficient for realization of greater and faster genetic improvement of production and reproduction traits of Simmental population of cattle. Therefore, centres for artificial insemination often import semen of elite bulls for planned insemination of Simmental bull dams, or borrow young bulls from abroad (waiting bulls) whose semen is used for insemination of main population. In this paper criteria for selection of cows into category of bull dams are presented as well as results relating to milk production, fertility, body development and type score of bull dams of Simmental breed in Central Serbia.PoveÄanje proizvodnje i kvaliteta mleka kao i intenziteta plodnosti, osnovni su preduslovi savremene govedarske proizvodnje. Za potrebe proizvodnje bikova simentalske domaÄe rase neophodno je iz matiÄnog zapata odabrati najbolje krave. Ova grla, po pravilu, predstavljaju oko 1% najboljih krava kontrolisane populacije, pre svega u proizvodnji mleka i mleÄne masti, a zatim i u telesnoj graÄi, graÄi vimena i osobinama plodnosti. OploÄavanje bikovskih majki se obavlja po odgovarajuÄem sistemu. Svakoj kravi se u toku jedne godine odreÄuje bik Äijim Äe se semenom osemeniti, a koji je prethodno odabran za oca buduÄih bikova. BuduÄi da je najbrži put selekcije i genetskog unapreÄenja osobina putem linije otac-sin, izboru bikovskih oÄeva se pridaje najveÄa pažnja. U Srbiji se na godiÅ”njem nivou testira jako mali broj bikova, Å”to je nedovoljno za ostvarivanje nekog veÄeg i bržeg genetskog poboljÅ”anja proizvodnih i reproduktivnih osobina populacije simentalske rase goveda. Iz tih razloga se centri za veÅ”taÄko osemenjavanje odluÄuju na uvoz semena za plansko oploÄavanje bikovskih majki simentalske rase, ili pozajmicu mladih bikova iz inostranstva (ÄekajuÄi bikovi) Äije seme se upotrebljava za veÅ”taÄko osemenjavanje matiÄne populacije. Pored kriterijuma na osnovu kojih se vrÅ”i odabiranje krava u kategoriju bikovskih majki u radu su prikazani i rezultati mleÄnosti, plodnosti, kao i telesne razvijenosti i ocene tipa bikovskih majki simentalske rase u centralnoj Srbiji
Ispitivanje uticaja mase pre klanja na rezultate vrednosti randmana klanja muÅ”kih tovnih junadi domaÄe Simenatalske rase
For the purpose of investigation of factors important for slaughter yield results, a trial with three groups of young cattle of Domestic Simmental breed of different body masses was carried out. Young cattle in the first group (G1) (n=6) had average body mass of 509,00 kg (475-525), in the second group (G2) of young cattle (n=7) average body mass of 554,29 kg (530 - 575) was recorded and in the third group of young cattle (G3) (n=8) 591,13kg (580-615). Subsequent to slaughtering warm carcass sides were measured individually, with and without kidney fat, mass of internal organs was measured (kidneys, liver, lungs, heart, spleen) and mass of other secondary slaughter products (head, tongue, tail, muscle part of diaphragm). After cooling carcass sides were cut into main parts. Based on obtained results of research it was established that male cattle of group (G2) of Domestic Simmental breed of average body mass of 554,29 kg have realized higher slaughter yield compared to groups G1 and G3, whereas the share of kidney fat was the same in all three groups of young cattle. Share of mass of internal organs was the lowest in young cattle of group G2 (2,47%) whereas in other two groups it was the same. Share of mass of other secondary slaughter products (head, tongue, tail, muscle part of diaphragm) in all three groups of young cattle was the same. Share of mass of round (I category part of the carcass) was the highest in young cattle of group G3 (29,86), and statistically significantly (P (lt) 0.05) lower in group G1 (28,39). Share of carcass parts of II category (loin, back, shoulder) was the lowest in young cattle of group G3 (23,655), and of carcass parts of category III (second thigh, second fore thigh, neck, breasts, ribs, belly) in young cattle of group G2 (44,45%).U cilju ispitivanja faktora znaÄajnih za rezultate vrednosti randmana klanja, izveden je ogled sa tri grupe junadi domaÄe simentalske rase razliÄite telesne mase. Prva grupa (G1) junadi (n=6) bila je proseÄne mase 509,00 kg (475-525), druga grupa (G2) junadi (n=7) bila je proseÄne mase 554,29 kg (530-575) i treÄa grupa (G3) junadi (n=8) bila je proseÄne mase 591,13 kg (580-615). Posle klanja izvrÅ”eno je pojedinaÄno merenje toplih polutki sa i bez bubrežnog loja, merenje mase unutraÅ”njih organa (bubrezi, jetra, pluÄa, srce, slezina) i merenje mase ostalih prateÄih proizvoda klanja (glava, jezik, rep, miÅ”iÄni deo dijafragme). Posle hlaÄenja polutke su raseÄene u osnovne delove. Na osnovu dobijenih rezultata istraživanja utvrÄeno je da su muÅ”ka junad druge grupe (G2) domaÄe simentalske rase proseÄne mase 554,29 kg, ostvarila veÄi randman u poreÄenju sa grupama G1 i G3, dok je uÄeÅ”Äe bubrežnog loja bilo isto kod sve tri grupe junadi. UÄeÅ”Äe mase unutraÅ”njih organa najmanje je kod junadi grupe G2 (2,47%) dok je kod je kod ostale dve grupe bilo isto. UÄeÅ”Äe mase ostalih prateÄih proizvoda klanja (glava, jezik, rep, miÅ”iÄni deo dijafragme) u sve tri grupe junadi je isto. UÄeÅ”Äe mase buta (deo trupa I kategorije) najveÄe je u junadi grupe G3 (29,86), a statistiÄki znaÄajno (P (lt) 0.05) manji u grupe G1 (28,39).Udeo delova trupa II kategorije (slabine, leÄa, pleÄka) najmanji je u junadi grupe G3 (23,655), a delova trupa III kategorije (potkolenica, podlaktica, vrat, grudi, rebra, potrbuÅ”ina) u junadi grupe G2 (44,45%)
Milk with functional food properties
This paper presents the results reflected on obtaining the milk enriched with omega-3 fatty acids. As source of omega-3 fatty acids, product of French company Vitalac called "TradiLin", was used. Trial was carried out on 20 trials (T) and 20 control (C) cows of Simmental breed and it lasted 80 days. Average content of omega-3 in trial and control group was 0.586 and 0.284 g/100g of extracted fat (Pā¤0.01), whereas content of omega-6 in same order of treatments was 3.141 and 3.011 g/100g of extracted fat (Pā¤0.05). Ratio omega-6/omega-3 fatty acids of 10.602 (control) was declined to 5.360 (trial), which is considered to be desirable from the aspect of nutrition with milk as functional food. Also, in other milk final product called "mladi kajmak", obtained by taking off milk fat from the surface of heat treated and cooled milk, content of omega-3 in trial and control group showed the same trend, 0.76 and 0.41 g/100g of extracted fat (Pā¤0.01), whereas content of omega-6 were 3.90 and 3.79 g/100g of extracted fat (Pā¤0.05). Ratio omega-6/omega-3 in control group was reduced of 9.24 to 5.10, which are considered to be extremely favourable. Chemical constituents of milk, somatic cell count as well as total plate count showed no differences between groups (P>0.05). Also, investigated treatment had no effect on changes in biochemical blood parameters
Ocena telesne kondicije visokomleÄnih krava
Problems which relate to production, health and reproduction in herds of high yielding cows very often occur due to insufficient knowledge and monitoring of energy reserves in cow organisms. Many researches and practical experiences in this field indicate significant relation between body condition and achieved results in production. Body condition of heads of cattle in certain stages of production cycle is important parameter of applied nutrition, but also entire technological procedure. In countries with developed cattle production, evaluation of body condition has for several years been main component of production practice on farms. It is considered that condition is very reliable indicator of the nutrition status and energy balance in the organism. Body condition score is subjective and practical method which enables precise assessment of deposited fat in the cow organism by observing and touching previously determined body regions and fields. There is considerable variability of the condition of cows in different stages of production cycle. Body condition of high yielding cows often comes out of the frame of optimal values for certain stage of production cycle. Decrease of production, disorders in health condition and fertility of cows indicate the nature of relation between inadequate body condition and stated problems. Shape and strength of the relation between production results and body condition score confirms its reliability. This is all indication of the need for wider application of this evaluation system. Based on body condition score, beside other important factors in the production cycle, there is realistic possibility to achieve more efficient production of milk from the aspect of energy. Main purpose of this paper was to present how the application of methods for body condition score and its significance for production practice can be functional.PostojeÄi problemi u proizvodnji mleka, rezultatima reprodukcije i zdravstvenom stanju visokoproizvodnih krava mogu da se dovedu u vezu sa primenjenom tehnologijom ishrane. Važno pitanje u tehnologiji ishrane visokomleÄnih krava predstavlja koliÄina raspoložive energije (hrana, depoi masti, miÅ”iÄi) u kljuÄnim fazama proizvodnog ciklusa (period zasuÅ”enja i rane laktacije). Deficit energije u kritiÄnim periodima proizvodnog procesa može da dovede do ozbiljnih poremeÄaja u proizvodnji, zdravlju i reprodukciji U poÄetnoj fazi proizvodnje mleka najkritiÄniji je period maksimalne dnevne proizvodnje. Negativan bilans energije najizraženiji je u vrhu laktacije. Visok gubitak energije na raÄun telesnih rezervi predstavlja veliko optereÄenje za metabolizam krava. ObezbeÄenje adekvatne koliÄine energije je složen uslov za svaku fazu proizvodnog ciklusa. OTK je subjektivan metod koji vizuelno i opipavanjem vrednuje koliÄinu potkožne telesne masti. OTK je koristan alat za upravljanje mleÄnim stadom. Idealna telesna kondicija je rang koji je u funkciji toka i faze laktacije. Procena rezervi energije u organizmu utvrÄena preko OTK u osnovi predstavlja hranidbeni status grla vrednovan preko deponovanog masnog tkiva, pri Äemu telesni okvir i masa grla imaju sekundaran znaÄaj. Jedan od sistema za OTK krava koji je znaÄajan za praksu je ameriÄki Virdžinija sistem modifikovan po Edmodsonu. Sistem za OTK kreiran je u obliku mape (karte) za ocenu visokomleÄnih krava. Mapa je precizno pripremljena za svaki telesni region i polje koji se može smatrati važnim u dodeli ukupne OTK krave. Tri velika telesna regiona (slabine, karlica i koren repa) podeljena su osam polja na telu krave (slabine imaju Äetiri polja; karlica ima tri polja; koren repa ima jedno polje). Svako telesno polje se posebno ocenjuje i koristi kao pokazatelj telesne kondicije. Svako grlo ocenjeno je individualno za promene nivoa ocene duž skale od 1 do 5. Kontinuirano se koristi poveÄanje od 0,25 delova poena. Ceo sistem OTK funkcioniÅ”e sa 17 nivoa u okviru ukupne skale ocena posmatrane u intervalu od minimalne ocene u iznosu 1 i maksimalne u iznosu 5. Ocena 1 pokazuje mrÅ”avu kondiciju. Ocena 5 pokazuje izrazito tovnu kondiciju. Svaka faza proizvodnog ciklusa ima svoju optimalnu ocenu. Pod normalnim uslovima krave treba da gube telesnu kondiciju najviÅ”e od 4 do 6 nedelja. U skromnim vrednostima telesna kondicija postepeno se vraÄa u periodu od 7 do 12 nedelje. Krave u prvih od 100 do 120 dana laktacije treba da imaju ocenu izmeÄu od 2,50 do 3,25. Ocena telesne kondicije od 200 dana laktacije do perioda zasuÅ”enja treba da je izmeÄu 2,75 i 3,50. Ishrana u periodu zasuÅ”enja treba da osigura ocenu izmeÄu 3,25 i 3,50. MoguÄnost vrednovanja energetskog (hranidbenog) statusa i efikasnosti ishrane visokomleÄnih krava pomoÄu OTK preporuÄuje ovaj sistem za praktiÄnu primenu u tehnoloÅ”kim programima na govedarskim farmama
Application of international accounting standard-16 in a public company with predominantly agricultural activities
This work suggests the existence of a number of advantages for
companies that have opted for the application of International
Accounting Standards. Their application allows fair reporting, which
is extremely important for countries in transition, as well as for those
countries that have not applied IAS. The authors carried a study
related to full application of IAS 16 to 114 companies, of which 10 are
public and 104 other companies are from the wider area of Novi Sad,
in the period 2010ā2015. In addition, the study of the case of public
companies is done in order to demonstrate the situation before and
after the valuation of assets and equipment as at 30 June 2012. The
state after 3 years is fairly shown on 30 June 2015, all in order to make
valid conclusions regarding fair reporting of the public enterprises. It
can be concluded that the application of IAS 16 has multiple benefits
by companies that fully apply fair reporting in its operations
Uzrast visokomleÄnih krava kod prve oplodnje
Black and White low land dairy cattle have very pronounced ability for high production of milk. Fertility is the major trait of cattle and key factor in successful milk production. Fertility traits have pronounced variability and low heritability value. Fertility is regularly limiting factor in attempts to increase the milk yield. Age of dairy cattle at first conception is one of the major reproduction properties. Age of calves at first calving depends mainly on age at first conception. Previous researches have indicated what would be the optimum age at first conception of Black and White heifers. Age at first conception is determined by the date of birth and date of first conception. Knowledge of the strength of the environment factors on age at first conception in high yielding cows is important from the aspect of their inclusion into the model. According to the significance of individual systematic factors, their objective assessment was carried out for the purpose of accurate evaluation of obtained results. Objective of this paper is to study the age at first conception of high yielding Black and white cows through major systematic influences, by applying adequate methodology. Cows comprising the studied sample (n=331) belong to European type of Black and White dairy cattle in final stage of improving of this breed with Holstein-Friesian breed. Average age of dairy cattle at first conception was 491.19Ā±9.36 days or 16.15Ā±0.31 months. According to cows' the values were following: 479.31 days (> 73% HF), 486.12 days (58-73%HF) and 508.14 days ( (lt) 58% HF).Osobine plodnosti imaju izuzetno veliki ekonomski znaÄaj koji se ispoljava kroz normalan tok proizvodnog ciklusa. Jedna od njihovih vrlo važnih specifiÄnosti je veoma izražena varijabilnost i niska naslednost. Uzrast grla kod prve oplodnje/teljenja je važna osobina plodnosti goveda. Crno-bela nizijska goveda imaju izraženu genetsku sposobnost za visoku proizvodnju mleka. Visokoproizvodne krave crno-bele rase izložene su tokom produktivnog veka velikom broju složenih uticaja. Uslovi proizvodnje vrlo Äesto nisu u saglasnosti sa visokim potrebama ove rase. Problemi u reprodukciji Äesto predstavljaju ograniÄavajuÄi faktor za poveÄanje proizvodnje mleka. UnoÅ”enjem gena holÅ”tajn-frizijske rase u okviru programa oplemenjivanja evropskih crno-belih goveda doÅ”lo je do tendencije poveÄanja prinosa mleka i smanjenja plodnosti. DosadaÅ”nja istraživanja ukazuju na prihvatljiv uzrast pri prvoj oplodnji kod junica crno-bele rase. Poznavanje jaÄine uticaja sredine na uzrast pri prvoj oplodnji kod visokomleÄnih krava važno zbog njihovog ukljuÄivanja u model. U skladu sa pojedinaÄnim znaÄajem sistematskih faktora, obavljena je njihova objektivna procena radi Å”to taÄnijeg vrednovanja ostvarenih rezultata. Cilj ovog rada je bio da se primenom odgovarajuÄe metodologije ispita uzrast kod prve oplodnje visokomleÄnih crno-belih krava preko najvažnijih sistematskih uticaja. Krave u okviru ispitanog uzorka (n=331) pripadaju evropskim crno-belim nizijskim govedima u zavrÅ”noj fazi oplemenjivanja holÅ”tajn-frizijskom rasom. ProseÄna starost grla pri prvoj oplodnji iznosila je 491.19Ā±9.36 dana ili 16.15Ā±0.31 meseci. Posmatrano po genotipovima krava iznosio je 479.31 dana (> 73%HF), 486.12 dana (58-73%HF) i 508.14 dana ( (lt) 58%HF). Na utvrÄene razlike u pogledu uzrasta pri prvoj oplodnji znaÄajan uticaj (pā¤0.05) pokazali su bikovioÄevi, klasa HF gena krava nije imala znaÄajan uticaj (p>0.05), godina teljenja pokazala je visoko znaÄajan uticaj (pā¤0.01), dok je sezona teljenja ispoljila znaÄajan uticaj (pā¤0.05)
DugoveÄnost visokomleÄnih krava
Population of Black and White cattle has high genetic potential for production of milk. It exists in very complex production conditions where problems occur which are often manifested in different health disorders, high percentage of culling and short productive life. Longevity parameters are calculated within defined time limits. Bottom limit is determined by date of birth, and top limit by date of culling. The knowledge of the strength of the influence of environment on the longevity of high yielding cows is important from the aspect of its inclusion into the model. According to individual significance of systematic factors, their objective assessment was carried out in order to evaluate the obtained results as precise and correct as possible. Previous studies of the average age of cows at culling from the herd indicated relatively short productive life and life in general of high yielding cows, which due to high percentage of culling effects the herd remount. Consequently selection differential is reduced and in this way realized selection effect is diminished. Objective of this paper was to investigate using appropriate methodology the longevity of high yielding Black and White cows of different genotypes through major systematic influences. Investigated cows according to their origin belong to European type of Black and White cattle in final stage of intensive improvement using Holstein-Friesian breed. Investigated sample included 331 cows. Average age of cows at culling is 2265Ā±463.26 days or 6.21Ā±1.27 years. Observed by cow genotypes, mean values varied from 2140.99 days (> 73% HF), 2247.51 days (58-73% HF) to 2406.97 days ( (lt) 58% HF). Average lifetime production was realized at the level of 25002.66Ā±7755.39 kg of milk with 3.61Ā±0.01% of milk fat.Bulls, sires of cows, class of HF genes and year of culling had highly significant effect (pā¤0.01), whereas the effect of reason for culling was significant (pā¤0.05) for life duration of cows.Efikasno koriÅ”Äenje krava u intenzivnoj proizvodnji potrebno je da traje Å”to duže. Vreme trajanja perioda od njihovog prvog teljenja do izluÄenja iz stada treba da omoguÄi poboljÅ”anje ukupne životne produktivnosti. Ovo bi, pored smanjenja troÅ”kova sa manjim udelom amortizacije u ceni koÅ”tanja, omoguÄilo bolje ukupne selekcijske rezultate preko nižeg remonta stada uz veÄi selekcijski diferencijal. Mnogo veÄa pažnja mora se posvetiti vremenu koriÅ”Äenja krava u proizvodnji i uzrocima njihovog izluÄenja. NajÄeÅ”Äi uzroci izluÄenja su: slaba mleÄnost, smetnje u plodnosti, poremeÄaji posle teljenja, oboljenja nogu, bolesti organa za varenje, mastitis i dr. ZnaÄajan broj istraživanja proseÄne starosti krava pri izluÄenju iz stada ukazuje na relativno kratak proizvodni i životni vek visokomleÄnih krava. On se ispoljava preko visokog procenta izluÄenja koji poslediÄno utiÄe na veÄi remont stada. Cilj ovog rada je da se primenom odgovarajuÄe metodologije ispita dugoveÄnost visokomleÄnih crno-belih krava razliÄitih genotipova preko najvažnijih sistematskih uticaja. Ispitivane krave svojim poreklom pripadaju evropskom tipu crno-belih goveda koje se nalaze u zavrÅ”noj fazi intenzivnog oplemenjivanja holÅ”tajn-frizijskom rasom. Ispitivani uzorak ukljuÄio je 331 kravu. ProseÄna starost krava kod izluÄenja iznosi 2265Ā±463.26 dana ili 6.21Ā±1.27 godina. Posmatrano po genotipovima krava srednje vrednosti su bile 2140.99 dana (> 73% HF), 2247.51 dana (58-73% HF) i 2406.97 dana ( (lt) 58% HF). ProseÄna životna proizvodnja ostvarena je na nivou od 25002.66Ā±7755.39 kg mleka sa 3.61Ā±0.01% mleÄne masti. Bikovi-oÄevi krava, klasa HF gena i godina izluÄenja imali su visoko znaÄajan uticaj (pā¤0.01), dok je uticaj razloga izluÄenja bio znaÄajan (pā¤0.05) na trajanje života krava
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