Varijabilnost i naslednost osobina tipa bikovskih majki holštajn frizijske rase

Objective of this study was to calculate the variability and heritability of type traits in the nucleus herd of bull dams by using the linear method of evaluation, and to determine their importance in selection of cattle. Study included 127 Holstein-Friesian cows selected as bull dams on cattle farms of PKB Korporacija, Belgrade. By applying the Least square method, main variationstatistical parameters were calculated: arithmeitc mean, standard deviation, variation coefficient, standard error and variation range. Bull dams of Holstein- Friesian breed had average milk production of 10245.98 kg, with variation range from 6514 kg to 13251 kg. Average milk fat yield was 361.95 kg, and milk fat content 3,53%. Average values for type scores of Holstein-Friesian bull dams were: rump height 5.40, chest width 7.09, body depth 7.38, rump position 5.39, rump width 6.55, dairy form 7.35, rear legs set (rear view) 5.22, rear legs set (side view) 5.28, hoof angle 5.27, fore udder 6.65, front teats placement 5.43, teat length 4.76, udder depth 6.96, rear udder height 7.13, suspensory ligament 7.08 and rear teats placement 5.89. Also, heritability coefficients and errors were calculated for all milk and type traits. Type and body development scores are very important indicators of production ability of cows, their potential to consume sufficient quantities of food, produce high quality milk from the technological aspect, reduce the use of energy in production and remain as long as possible in exploitation.Cilj ovih istraživanja bio je da se u nukleus zapatu bikovskih majki primenom linearnog metoda ocenjivanja krava izračuna varijabilnost i heritabilitet osobina tipa, i njihov značaj u selekciji goveda. Istraživanjem je obuhvaćeno 127 krava holštajn frizijske rase odabrane u kategoriju bikovskih majki na farmama PKB Korporacije, Beograd. Za sve ispitivane osobine primenom metoda najmanjih kvadrata izračunati su osnovni varijaciono-statistički parametri: aritmetička sredina, standardna devijacija, koeficijenti varijacije, standardna greška i interval varijacije. Bikovske majke holštajn frizijske rase ostvarile su prosečnu proizvodnju mleka od 10245.98 kg, pri čemu je interval variranja bio od 6514 kg do 13251 kg. Prosečna proizvodnja mlečne masti iznosila je 361,95 kg, a sadržaj mlečne masti 3,53%. Prosečne vrednosti ocene tipa bikovskih majki holštajn frizijske rase iznosile su: visina krsta 5,40, širina grudi 7,09, dubina tela 7,38, položaj karlice 5,39, širina karlice 6,55, mlečne karakteristike 7,35, položaj zadnjih nogu otpozadi 5,22, položaj zadnjih nogu sa strane 5,28, ugao papaka 5,27, prednja veza vimena 6,65, pozicija prednjih sisa 5,43, dužina sisa 4,76, dubina vimena 6,96, visina zadnjeg vimena 7,13, centralni ligament 7,08 i položaj zadnjih sisa 5,89. Osim toga za sve osobine mlečnosti i tipa izračunati su koeficijenti heritabiliteta i njihove greške. Ocene tipa i telesne razvijenosti su veoma važni pokazatelji proizvodnih sposobnosti krava, njihovih mogućnosti da konzumiraju dovoljne količine hrane, daju tehnološki kvalitetno mleko, smanje utrošak energije u proizvodnji i što duže ostanu u eksploataciji

Značaj korišćenja 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 čoveka u urbanim uslovima karakteriše nekretanje kao osnovni uslov zdravlja, prisustvo velike količine aditiva i rezidua pesticida u hrani biljnog i animalnog porekla, zagađeni vazduh i voda. Ako se tome doda i prisustvo oksidativnog stresa kao deo normalnog metabolizma koji se dešava pri razlaganju hranljivih materija, pri čemu se oslobodi velika količina slobodnih radikala, koje organizam u ovakvim uslovima često nije sposoban da potpuno neutrališe, dolazi do narušavanja homeostatskih mehanizama koje često dovode do narušavanja zdravlja pa i do najtežih bolesti. U ovakvim složenim uslovima življenja, izazov nauke je da pronađe načine kako da putem hrane, pre svega osnovnih životnih namirnica mleka i mesa, obogaćujući ih pojedinim materijama koji su od vitalnog značaja za naše zdravlje, utiče na sprečavanje bolesti i usporavanje procesa starenja. Jedan od načina je i korišćenje funkcionalne hrane koja pored osnovne hranljive vrednosti treba da sadrži i takve sastojke koji utiču na popravljanje opšteg zdravstvenog stanja, odnosno deluju preventivno i terapeutski. U radu je na revijalan način predstavljen značaj omega-3 masnih kiselina u ishrani ljudi koje kao esencijalne materije ne mogu da se sintetišu u organizmu, već moraju da se unesu putem obroka. Takođe, ukazano je i na značaj pojedinih esencijalnih omega-6 masnih kiselina kao i međusoban odnos ovih dveju kiselina. Pored toga, istaknuta je uloga omega-3 masnih kiselina u ishrani životinja koje ih unose ili putem paše ili kao dodatak obroku, a one utiču na popravljanje njihovih proizvodnih, reproduktivnih i zdravstvenih performansi

Stočarska proizvodnja - stanje i budući pravci razvoja u Republici Srbiji

Livestock production is important branch of agriculture in Republic of Serbia. Over 700.000 households are engaged in this production, which is over 55% of total number of households. Livestock production provides necessary products (milk, meat, eggs) for nutrition of domestic population. Also, livestock production provides raw materials for food industry (dairy plants, slaughterhouses, meat industry, conditory industry and leather industry). Livestock production is expected to provide high quality products for export, primarily beef and lamb meat. Chance/opportunity for export exists also for cheeses of high quality (especially sheep and goat cheeses) of defined origin and quality. Based on available data, current situation in livestock production is assessed as inviolable. Number of heads of all species of domestic animals and poultry has been constantly decreasing over the period of last 12 years. The greatest decrease of number of heads of livestock was recorded in years 2000, 2001 and 2002, in all species of domestic animals. During this period, number of cattle decreased by 18,6%, of pigs by 11,8%, sheep by 12,3%, number of goats by 54,1%, horses by 66,0% and poultry by 28,0%. So, by the end of 2007, number of cattle was 1.087.000, pigs 3.832.000, sheep 1.606.000, goats 149.000, horses 18.000 and poultry 16.422.000. Republic of Serbia will in its near future become member of European Union (EU) and World Trade Organization (WTO), which means that livestock production should prepare for competition on unique developed market, without any state trade barriers. Serbia has been preparing for this since 2006 when it signed bilateral agreement on free trade with neighbouring countries - Central European Free Trade Agreement (CEFTA) and in this way became part of the market and accepted the competition rules on the free market. Accession to EU and WTO includes liberalization of trade in livestock products, low possibility for import protection, implementation of quality standards (HACCP; ISO, Global GAP), reduction of the level of domestic support, discontinuing of export subsidies, increase of profitability and ability to be competitive on the international market.Stočarska proizvodnja je značajna grana poljoprivrede u Republici Srbiji. Zastupljeno je u preko 700.000 domaćinstava (55% od ukupnog broja domaćinstava) i predstavlja značajnu privrednu granu koja učestvuje u formiranju društvenog proizvoda poljoprivrede sa 42%. Stočarskom proizvodnjom se obezbeđuju neophodni proizvodi (mleko, meso, jaja) za ishranu domaćeg stanovništva. Pored toga stočarstvo obezbeđuje sirovine za prehrambenu industriju (mlekare, klanice, konditorske industrije i industrija prerade kože). Od stočarske proizvodnje se očekuje da obezbedi kvalitetne proizvode za izvoz, pre svega juneće i jagnjeće meso. Šansu za izvoz imaju i kvalitetni sirevi (posebno ovčiji i koziji) sa definisanim poreklom i kvalitetom. Na osnovu raspoloživih podataka stanje stočarstva u Srbiji se ocenjuje kao nepovoljno. Broj grla kod svih vrsta domaćih životinja i živine u poslednjih dvanaest godina konstantno opada. Najveće smanjenje broja grla registrovano je u toku 2000., 2001., i 2002. godine kod svih vrsta domaćih životinja. U ovom periodu broj goveda je smanjen za 18,6%, broj svinja za 11,8%, broj ovaca za 12,3%, broj koza za 54,1% broj konja za 66,0% i broj živine za 28,0%. Tako da je na kraju 2007. godine broj grla goveda 1.087.000 , 3.832.000 grla svinja, 1.606.000 grla ovaca, koza 149.000, 18.000 grla konja i 16.422.000 živine. Republika Srbija u bližoj budućnosti postaće član Evropske unije (EU) i Svetske trgovinske organizacije (STO) što znači da se stočarska proizvodnja mora pripremiti za konkurenciju na jedinstvenom razvijenom tržištu, na kome neće postojati državne trgovinske barijere. Srbija na tom putu se priprema već od 2006. godine potpisivanjem bilateralnog sporazuma o slobodnoj trgovini sa susednim zemljama (Central European Free Trade Agreement (CEFTA) i samim tim postala deo tržišta i prihvatila pravila konkurencije na slobodnom tržištu. Pristupanje u EU i STO podrazumeva veću liberalizaciju trgovine stočarskim proizvodima, mala mogućnost zaštite od uvoza, implementacija standarda kvaliteta (HACCP; ISO, Global GAP), smanjenje nivoa domaće podrške, ukidanje izvoznih subvencija, povećanje profitabilnosti i sposobnost da se izdrži konkurencija na međunarodnom tržištu

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.Povećanje proizvodnje i kvaliteta mleka kao i intenziteta plodnosti, osnovni su preduslovi savremene govedarske proizvodnje. Za potrebe proizvodnje bikova simentalske domaće rase neophodno je iz matičnog zapata odabrati najbolje krave. Ova grla, po pravilu, predstavljaju oko 1% najboljih krava kontrolisane populacije, pre svega u proizvodnji mleka i mlečne masti, a zatim i u telesnoj građi, građi vimena i osobinama plodnosti. Oplođavanje bikovskih majki se obavlja po odgovarajućem sistemu. Svakoj kravi se u toku jedne godine određuje bik čijim će se semenom osemeniti, a koji je prethodno odabran za oca budućih bikova. Budući da je najbrži put selekcije i genetskog unapređenja osobina putem linije otac-sin, izboru bikovskih očeva se pridaje najveća pažnja. U Srbiji se na godišnjem nivou testira jako mali broj bikova, što je nedovoljno za ostvarivanje nekog većeg i bržeg genetskog poboljšanja proizvodnih i reproduktivnih osobina populacije simentalske rase goveda. Iz tih razloga se centri za veštačko osemenjavanje odlučuju na uvoz semena za plansko oplođavanje bikovskih majki simentalske rase, ili pozajmicu mladih bikova iz inostranstva (čekajući bikovi) čije seme se upotrebljava za veštačko osemenjavanje matične populacije. Pored kriterijuma na osnovu kojih se vrši odabiranje krava u kategoriju bikovskih majki u radu su prikazani i rezultati mlečnosti, plodnosti, kao i telesne razvijenosti i ocene tipa bikovskih majki simentalske rase u centralnoj Srbiji

Uticaj paragenetskih faktora na telesnu razvijenost bikovskih majki Simentalske rase

Body development and type are very important indices of production ability of cows, their capacity to consume sufficient quantity of food, produce technologically high quality milk, reduce the energy consumption in production of milk, remain in exploitation as long as possible and give more progeny. This research included 278 cows of Simmental breed selected into the category of bull dams on the territory of Republic of Serbia. By application of method of least squares following average values of exterior measures were obtained: height to withers 136,04 cm; carcass length 165,81 cm; breast depth 73,61 cm; breast girth 201,12 cm; body mass 695,29 kg. Regions influenced statistically highly significantly all investigated exterior traits (P (lt) 0,01). Year of measuring had no statistically significant effect (P>0,05) on body development of Simmental bull dams. Obtained values were considerably uniform without any greater oscillations. .Telesna razvijenost i tip su veoma važni pokazatelji proizvodnih sposobnosti krava, njihovih mogućnosti da konzumiraju dovoljne količine hrane, daju tehnološki kvalitetno mleko, smanje utrošak energije u proizvodnji i što duže ostanu u proizvodnji i daju veći broj potomaka. Ovim istraživanjem je obuhvaćeno 278 krava simentalske rase odabrane u kategoriju bikovskih majki na području Republike Srbije. Primenom metoda najmanjih kvadrata dobijene su prosečne vrednosti eksterijernih mera: visina grebena 136,04 cm; dužina trupa 165,81 cm; dubina grudi 73,61 cm; obim grudi 201,12 cm; telesna masa 695,29 kg. Regioni su statistički vrlo značajno uticali na sve ispitivane eksterijerne osobine (P (lt) 0,01). Godina merenja nije statistički značajno uticala (P>0,05) na telesnu razvijenost bikovskih majki simentalske rase. Dobijene vrednosti bile su dosta ujednačene bez nekih većih oscilacija.

Uzroci izlučenja krava u vezanom sistemu držanja

Causes for cow culling in a tie stall system were investigated on a sample of 3060 cows culled in 2011, on seven large dairy farms in the Belgrade region. The total level of culling was 34.58% of the average number of cows. The number of cows culled decreased with lactation order (from 981 cows in the first to 294 cows in the sixth and later lactations). The most dominant cause for culling were diseases of the legs and hooves (28.4%), as was expected, having in mind the tie stall system. If selection (low production) is abstracted as the reason for culling, what stands out by importance are metabolic diseases (15.7%) and problems of reproduction (reproductive diseases - 8.6%, and difficult calvings and abortions 5.7%). With the increase of duration of the lactation during which cows were culled, reproductive diseases gained importance as the reason for culling, while the importance of metabolic diseases and diseases of the legs and hooves in this context decreased. When culled, on the average, cows were 5.2 years old, having on the average spent 1112 days in production, of which 978 days in milking. Their average milk production per day of milking was 22.00 kg, per day of life 10.6 kg, and per day of production 19.8 kg.Ispitivanje uzroka izlučenja krava u vezanom sistemu držanja izvršeno je na uzorku 3060 izlučenih krava tokom 2011. godine na sedam velikih farmi za proizvodnju mleka u Beogradskom regionu. Ukupna stopa izlučenih krava iznosila je 34,58% od prosečnog broja krava. Broj izlučenih krava se smanjivao sa porastom laktacije po redu (od 981 krave u prvoj do 294 krave u šestoj i ostalim laktacijama). Najdominantniji uzrok izlučenja su bila oboljenja nogu i papaka (28,43%), što je i očekivano s obzirom na vezani sistem držanja. Ako se izuzmu selekcijski razlozi (niska proizvodnja), kao razlozi izlučenja po značaju se izdvajaju metaboličke bolesti (15,72%) i problemi sa reprodukcijom (reproduktivne bolesti - 8,63% i težina telenja i abortusi 5,65%). Sa porastom trajanja laktacije u kojoj su krave izlučene, reproduktivne bolesti su sve više dobijale na značaju kao razlog izlučenja, a metaboličke bolesti i bolesti nogu i papaka gubile. U momentu izlučenja krave su u proseku bile stare 5,18 god. i u proizvodnji su prosečno provele 1112 dana, od toga 978 dana u muži. Njihova prosečna proizvodnja mleka po danu u muži je bila 21,96 kg, po danu života 10,63kg i po produktivnom danu 19,75 kg

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 (P≤0.01), whereas content of omega-6 in same order of treatments was 3.141 and 3.011 g/100g of extracted fat (P≤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 (P≤0.01), whereas content of omega-6 were 3.90 and 3.79 g/100g of extracted fat (P≤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

Proizvodnja junećeg 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 korišćenja proizvoda 'Tradi-Lin' kao izvora omega-3 masnih kiselina u obrocima junadi u tovu. Proizvod 'TradiLin'dobijen je termičkom obradom semena lana, sadrži 58% omega-3 i 15% omega-6 masnih kiselina od ukupno polinezasićenih 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 identični i bazirani na silaži cele biljke kukuruza i smeši koncentrata. Jedina razlika bila je ta što su grla pored osnovnog obroka dobijala 0, 300 i 700 g 'Tradi-Lin' -a dnevno, respektivno. Na kraju ogleda grla su zaklana i određeni su najvažniji parametri hemijskog sastava i kvaliteta mesa. Dobijeni rezultati ukazuju da u intramuskularnoj masti leđnog dela M. longissimus dorsi (MLD) nije postojala razlika u sadržaju zasićenih (50,89; 50,21; 50,32%) i nezasićenih (49,15; 49,79; 49,66%) masnih kiselina među ispitivanim tretmanima (C, T1 i T2). Međutim, dodavanje 'TradiLin'- a uticalo je na promenu strukture intramuskularne masti u korist povećanja PUFA od 4,95 (C), na 5,98 (T1) odnosno 7,31% (T2) (P (lt) 0.05). Treba posebno istaći povećanje sadržaja omega-3 masnih kiselina sa 0,36 (C) na 0,60 (T1) odnosno na 0,76% (T2), (P (lt) 0,05). Jednovremeno povećao 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 nezasićenih 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 utiče na zanemarljivo povećanje cene u odnosu efekte koji se dobijaju. Sa nutricionističkog aspekta ovi rezultati imaju veliki značaj imajući u vidu da omega-3 masne kiseline imaju vitalnu ulogu u očuvanju zdravlja ljudi

Fenotipski i genetski parametri reproduktivnih osobina crno belih krava sa različitim udelom HF gena

In this paper, results of the effect of direct and indirect selection of quantitative fertility traits of cattle end heritability level are presented. Study of the quantitative genetic parameters was carried out on three large farms of Black and White, Holstein-Friesian cattle. Investigation included 3900 first calving cows, daughters of 54 bull sires. The effect of genetic group of the head of cattle (genotype) and of the herd on fertility and milk traits of heifers and first calving cows of Black and White breed was investigated. Genetic group of the head of cattle (genotype) had no significant effect in variation of the fertility traits compared to general average (P (lt) 0.01). The effect of herd caused statistically significant and highly significant deviation from the general average, P (lt) 0.05 and P (lt) 0.01. Established heritability coefficients for fertility traits had low values for age at insemination (0,112), duration of pregnancy (0,045) and duration of service period (0,097). Results were obtained by applying mathematicalstatistical analysis of data - using mixed model (Harvey, 1990). Mathematical-statistical analysis of data was carried out using linear methods with fixed influence through model of Least Squares (LS method). Genotype of the head of cattle caused no significant deviation of fertility traits (P>0,05).U ovom radu su predstavljeni rezultati uticaja direktne i indirektne selekcije na kvantitativne osobine plodnosti goveda i nivo heritabiliteta. Ispitivanje kvantitativnih genetskih parametara je izvedeno na tri velike farme gde se gaje crno-bela, holštajn-frizijska goveda. Ispitivanje je uključivalo 3900 prvotelki, kćeri 54 bika-očeva. Ispitivan je uticaj genetske grupe grla goveda (genotip) i zapata na osobine plodnosti i mlečnosti junica i prvotelki crno-bele rase. Genetska grupa grla goveda (genotip) nije imala signifikantan uticaj na variranje osobina plodnosti u odnosu na opšti prosek (P (lt) 0.01). Uticaj zapata je izazvao statistički signifikantno i visoko signifikantno odstupanje od opšteg proseka, (P (lt) 0.05) and (P (lt) 0.01). Ustanovljeni koeficijenti heritabiliteta za osobine plodnosti su imali niske vrednosti za osobine uzrast pri prvoj inseminaciji (0,112), trajanje bremenitosti (0,045) i trajanje servis perioda (0,097). Rezultati su dobijeni primenom matematičko-statističke analize podataka - korišćenjem mešovitog modela (Harvey, 1990). Matematičko-statistička analiza podataka je izvršena korišćenjem linearnih metoda sa fiksnim uticajem kroz model najmanjih kvadrata (LS metod). Genotip grla goveda nije izazvao signifikantno odstupanje osobina plodnosti (P>0,05)

Uticaj vremena zrenja i CaCl2 na kvalitet junećeg mesa

Investigations were carried out on four muscles (M. longissimus dorsi, M. semimembranosus, M. semitendinosus, M. biceps femoris) taken from five young cattle (crosses Domestic Spotted x Limousine) of average body mass prior to slaughtering of 587 kg. On all muscles, 24 h after slaughtering, sensory evaluation was carried out and the following parameters determined: pH value, colour, water binding ability, cooking loss and tenderness (initial values). The remaining part of each muscle was divided into 6 parts, 3 were packaged in plastic foil (control samples), and other 3 were soaked in solution containing 0,4% CaCl2 and 0,4% NaCl and packaged in plastic foil. Pieces of meat prepared in this way were left on temperature of + 40C 7, 14 and 21 days to mature. After this period, all mentioned analyses were carried out on meat samples. It was established that pH value during maturation increased, that meat packaged in plastic foil after 14 days of maturation becomes unusable, whereas the increase of pH values of meat whose maturation occurred in solution CaCl2 and NaCl was slower and therefore meat was still usable after 21 days. Color of meat in control samples was slightly lighter compared to initial condition, whereas the color of meat whose maturation occurred in solutions of salt was statistically considerably lighter (P (lt) 0,05 after 7 days, a P (lt) 0,001 after 14 and 21 days). Water binding ability in control samples was slightly better (P>0,05) after 7 days and after 14 days it was statistically significantly better (P (lt) 0,05) compared to initial state, whereas in meat whose maturation occurred in salt solution this ability was at initial level even after 21 days. Cooking loss in control samples was lower compared to initial values whereas in meat soaked in salt solution cooking loss was higher. Meat tenderness in control samples was statistically considerably better after 14 days of maturation (when meat was not fit for use) and in meat soaked in salt solution it was statistically highly significantly better after 14 and 21 days. According to sensory evaluation, control samples of meat, after 14 days of maturation are not fit for use, whereas meat whose maturation occurred in solution of CaCl2 and NaCl even after 21 days is acceptable from the sensory aspect.Ispitivanja su obavljena na četiri mišića (M. longissimus dorsi, M. semimembranosus, M. semitendinosus, M. biceps femoris) uzetih od pet junadi (melezi domaće šareno goveče x limuzin), prosečne mase pred klanje 587 kg. Na svim mišićima 24 sata posle klanja obavljena je senzorna ocena i određeni su: pH vrednost, boja, sposobnost vezivanja dodate vode, kalo kuvanja i mekoća (početne vrednosti). Ostatak svakog mišića podeljen je na 6 delova od kojih su po 3 upakovani u plastičnu foliju (kontrolni uzorci), a ostala 3 dela su potopljena u rastvor koji sadrži 0,4% CaCl2 i 0,4% NaCl i upakovani u plastičnu foliju. Ovako pripremljeni komadi mesa ostavljeni su pri temperaturi od + 40C 7, 14 i 21 dan na zrenju. Posle isteka zadatog vremena urađena su na komadima od svih mišića navedena ispitivanja.Utvrđeno je da se pH vrednost tokom zrenja povećava i da u mesu koje je upakovano u plastičnu foliju posle 14 dana zrenja dospeva u oblast kad je meso neupotrebljivo, dok je povećanje pH vrednosti kod mesa čije se zrenje odvijalo u rastvoru CaCl2 i NaCl sporije tako da je meso i posle 21 dan upotrebljivo. Boja mesa kod kontrolnih uzoraka bila je neznatno svetlija u odnosu na početno stanje, dok je boja mesa čije se zrenje odvijalo u rastvoru soli bila statistički značajno svetlija (P (lt) 0,05 nakon 7 dana, a P (lt) 0,001 nakon 14 i 21 dan). Sposobnost vezivanja vode kod kontrolnih uzoraka bila je neznatno (P>0,05) bolja nakon 7 dana dok je nakon 14 dana bila statistički značajno bolja (P (lt) 0,05) u poređenju sa početnim stanjem, dok je kod mesa čije se zrenje odvijalo u rastvoru soli i posle 21 dan bila na nivou početnog stanja. Kalo kuvanja kod kontrolnih uzoraka bio je manji u poređenju sa vrednostima na početku ogleda dok je kod mesa potopljenog u rastvor soli bio veći. Mekoća mesa kod kontrolnih uzoraka bila je statistički značajno bolja nakon 14 dana zrenja (kad je meso bilo neupotrebljivo) dok je kod mesa potopljenog u rastvor soli bila statistički visoko značajno bolja posle 14 i 21 dan. Prema senzornoj oceni kontrolni uzorci mesa nakon 14 dana zrenja postaju neupotrebljivi, dok je meso čije se zrenje odvijalo u rastvoru CaCl2 i NaCl i nakon 21 dan zrenja senzorno veoma prihvatljivo