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Dražen Đuričić

University of Zagreb

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Marko Samardžija

University of Zagreb

145

Silvijo Vince

University of Zagreb

Hrvoje Valpotić

University of Zagreb

Tomislav Dobranić

University of Zagreb

IŽ

Ivona Žura Žaja

University of Zagreb

Juraj Grizelj

University of Zagreb

Ivan Folnožić

University of Zagreb

Damjan Gračner

University of Zagreb

Nino Mačešić

University of Zagreb

Romana Turk

University of Zagreb

Cooperative Institutions

University of Zagreb

138

Croatian Veterinary Institute

University of Veterinary Medicine

University of Osijek

University of Belgrade

Hrvatski zavod za javno zdravstvo

University Hospital Centre Zagreb

College of Agriculture at Križevci

Ministarstvo Gospodarstva

University of Ljubljana

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Dietary zeolite clinoptilolite supplementation influences chemical composition of milk and udder health in dairy cows

Veterinarska stanica (2017)

Dražen Đuričić Miroslav Benić Nino Mačešić Hrvoje Valpotić Romana Turk

Clinoptilolite

Udder

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Reproduction of rabbits, hamsters and guinea pigs

Marko Samardžija Dražen Đuričić

Udžbenik je podĳeljen u 3 dĳela: U I. je dĳelu opisano znacenje kunicarske proizvodnje i povĳesni razvoj kunicarstva od domestikacĳe do danasnjih dana, taksonomĳa i sistematika, genetika i pasmine kunica, anatomĳa spolnih organa kunica, fiziologĳa rasplođivanja, rasplođivanje i okolis, hranidba te nacini uzgoja kunica. Povrh toga opisana je biotehnologĳa rasplođivanja, fiziologĳa i patologĳa gravidnosti, porođaj, neplodnost mužjaka i ženke, neke bolesti spolnih organa i bolesti mlĳ ecnih žlĳezda. U ovom je poglavlju jos prikazano upravljanje rasplođivanjem kunica sto je jedinstveno u domacoj i svjetskoj literaturi, a spomenuti dio zavrsava prikazom perinatalnih bolesti kao i bolesti mladuncadi. U II. je dĳelu prikazana sistematika, taksonomĳa i vrste hrcaka, anatomĳa spolnih organa hrcaka, njihovo rasplođivanje, spolni ciklus, određivanje spola, ponasanje tĳekom parenja, gravidnost, porođaj i njegova indukcĳa, pobacaji, neplodnost, upala mlĳ ecne žlijezde, rast i razvoj podmlatka te hranidba hrcaka. U III. su dĳelu prikazani važni cimbenici porodice Caviidae, roda Cavia vrste Cavia porcellus, nacin držanja, ponasanje zamorcica, anatomĳa spolnih oragana, spolni ciklus, određivanje spola, fiziologĳa i patologĳa gravidnosti, porođaj, velicina legla, perinatalni gubitci, teski porođaji, izvala maternice, eklampsĳa, bolesti mlĳecne žlĳezde, neplodnost ženke i mužjaka, upravljanje rasplođivanjem zamorcica, indeks produktivnosti, hranidba zamorcica i zamorcici kao hrana.

Cavia

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Hormonal treatements of recipient does and semilaparoscopic embryotransfer

Juraj Grizelj Silvijo Vince Gérard Baril Antun Tomašković Dražen Đuričić

This article examined the procedure of recipient does hormonal preparation and the technique of semilaparoscopic embryotransfer as well. Furthermore, the technique of direct transfer of thawed embryos was discussed as well as the obstacles associated with those procedures which should significantly contribute to genetic improvement of the flocs. The hormonal preparation of recipient does consisted of insertion of vaginal sponges through 11 days and application of eCG and prostaglandins on day 9. 24h after sponges were removed, detection of oestrus was performed. Seven days later semilaparoscopic direct transfer of thawed embryos were performed. Before the transfer, the uterus, ovaries and the quality of corpora lutea were visually evaluated by laparoscope. There should be at least one functional corpus luteum (even better 2 of them), red in colour and 6-7 days old in order to use the goat as a recipient. Late ovulations as well as early luteolisis should be avoided. The choosen horn was fixed and punctuated near the uterotubal junction in order to accomplish the transfer. It is important not to pass more than 1 minute from thawing till transfer of embryos. The direct transfer consist of thawing, after which the embryos are not passed through decreasing concentration of cryoprotector solutions but are quickly transferred into the uterine horn.

Uterine horns

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Seasonal lambing distribution of the Romanov breed in northwestern Croatia during five consecutive years

Dražen Đuričić Hrvoje Valpotić Romana Turk Silvijo Vince Juraj Grizelj

Objectives. The aim of this study was to investigate the lambing distribution of the Romanov breed in northwestern Croatia during five consecutive years. Most European breeds of sheep are seasonal breeders in the moderate climate region ; however, the Romanov breed is a meat breed that is aseasonally polyoestrous. Romanov sheep are considered to be highly fertile, with a fecundity rate of 230% or more. In Croatia, the lambing season is primarily in the winter and spring for seasonal breeders. Materials and methods. During five consecutive years (December 2011 to November 2016) at eight medium-scale sheep farms in northwestern Croatia, there were 5379 mattings with 5046 successful conceptions i.e. lambings. Ewes were kept at pasture, which primarily provided area for exercise, with access to stables during the night, in a semi-intensive environment. According to standard farming practices, animals had free access to good quality meadow hay (about 1.8 kg per doe daily), adequate concentrate and drinking water. Results. Fertility was 93.81%. The seasonal distribution of lambings in this study was: 47.64% of ewes delivered in winter (n=2422), 23.37% in spring (n=1179), 18.82% in summer (n=950) and 9.81% in autumn (n=495). The winter season refers to the period of December to February. Sexual activity was lowest was during spring and early summer (March to June) with a peak of sexual activity from August to October. Litter size was greater during spring and winter than in other seasons (1.67 vs.1.36) though birth weight was lower in larger than in smaller litters (2.64±0.65 vs. 2.87±0.61). Conclusions. More lambs during lambing season and a higher percentage of multiple births (triplets, quadruplets, etc.) was expected during the optimal breeding season, as seen in most European sheep breeds. Despite being aseasonally polyoestrous, the distribution of mating and lambing was not uniform through the seasons for the Romanov breed.

Domestic sheep reproduction

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Barn

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Ozone treatment of metritis and endometritis in Holstein cows.

Veterinarski arhiv (2014)

Dražen Đuričić Marija Lipar Marko Samardžija

The aim of research was to investigate the frequency of metritis and endometritis, also the efficacy of ozone spray treatment in Holstein cows. The cows (n = 91) ranged from 2 to 7 years of age and were housed in two commercial dairy farms in the north-western region of Croatia. The study was conducted over the course of 1 year. The cows were divided into the three groups based on uterine findings and diagnosis (metritis, endometritis and control). The first group comprised cows suffering from metritis diagnosed on days 5 and/or 15 following parturition. The second group included cows diagnosed with endometritis on days 25 and/or 45 after parturition. The third group included animals without clinical signs of uterine in flammation. In cases when metritis or endometritis was established, ozone foam (Riger spray G) was inserted into the uterus. Ozone was applied by means of a vial containing ozonated foam under pressure for 5 seconds. The time to the first postpartal insemination was shorter for controls compared to the metritis and endometritis groups (P<0.05). The days open until pregnancy was the longest (133 days) in cows with endometritis (n = 28). In the control group (n = 41) the days open until pregnancy was 125 days and in the group of cows treated for metritis (n = 22) was 120 days. Conception rates for the first, second and third groups were 1.86, 2.21 and 1.90, respectively. The intrauterine ozone flush therefore has potential to alleviate metritis and endometritis as an effi cacious and cost-effective treatment option with an overall positive effect on fertility and the host regarding tissues in Holstein cows.

Metritis

Endometritis

Vaginal discharge

Ceftiofur

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Positive and negative effects of reactive oxygen species on the fertilization ability of spermatozoa.

Veterinarska stanica : znanstveno-stručni veterinarski časopis (2016)

Ivona Žura Žaja Mihael Samardžija Silvijo Vince I. Ljubičić Lada Radin

U fizioloskim uvjetima, u ejakulatu postoji ravnoteža između oksidansa i antioksidansa, koja osigurava preživljavanje i normalnu funkciju spermija. Prekomjerno stvaranje reaktivnih kisikovih spojeva (ROS) može nadvladati zastitni antioksidacijski mehanizam i u dvosloju stanicne membrane spermija, inicirati oksidativne promjene u lipidima i/ili bjelancevinama te izazvati promjene u DNK-a, cime dolazi do smanjene gibljivosti i preživljavanja spermija. U nekim patoloskim stanjima, primjerice upalama reproduktivnoga sustava, aktivirani leukociti, ali i/ili patoloski oblici i mrtvi spermiji prekomjerno stvaraju ROS, sto dovodi do oksidativnog stresa spermija u ejakulatu. Naime, oksidativni je stres najucestaliji uzrok neplodnosti mužjaka, a nastaje zbog narusavanja ravnoteže stvaranja oksidansa (slobodnih radikala, ROS-a itd.) i antioksidacijske zastite na stanicnoj razini ili razini cijeloga organizma. Stanicna membrana spermija sisavaca sadrži veliki udio visestruko nezasicenih masnih kiselina, a takva je struktura odgovorna za fleksibilnost i funkcionalnu sposobnost spermija. Međutim, lipidi su spermija glavni supstrati za lipidnu peroksidaciju (LPO) prouzrocenu ROS-om, sto može dovesti do znatnih funkcionalnih poremecaja spermija. Sukladno tome, spermiji su jedinstveni po strukturi, funkciji i izrazitoj osjetljivosti na ostecenja prouzrocena LPO. S druge strane, male (fizioloske) kolicine ROS-a poboljsavaju sposobnost spermija u interakciji sa zona pellucidom, stimuliraju kapacitaciju, hiperaktivaciju, akrosomsku reakciju i fuziju spermija s oocitom. Nepoznato je koja kolicina ROS-a ima pozitivan ucinak na funkcionalnu sposobnost spermija, a koja kolicina može dovesti do neplodnosti mužjaka. Spermiji u aerobnim uvjetima tijekom normalnih metabolickih procesa stvaraju ROS, a izloženi su visokoj razini kisika tijekom prolaska kroz muski i ženski spolni sustav te tijekom procesa oplodnje. Istodobno u ejakulatu postoje visestruki mehanizmi za zastitu od oksidativnih ostecenja, unutarstanicni i izvanstanicni antioksidacijski enzimski i neenzimski sustavi. Enzimski antioksidansi i antioksidansi male molekularne mase spermija i sjemene plazme djeluju sinergijski kao mehanizam samozastite u uklanjaju slobodnih radikala. Najdjelotvorniji enzimski antioksidansi obuhvacaju superoksid dismutazu, katalazu i glutation peroksidazu, a neenzimski antioksidansi ukljucuju tiolne antioksidanse, vitamine C i E, karotenoide, prirodne flavonoide, albumine, mokracnu kiselinu te druge spojeve i minerale, primjerice Se. Međutim, antioksidacijski enzimi imaju znacajniju funkciju u zastiti spermija od ROS-a. Antioksidansi su smjesteni uglavnom u sredisnjem dijelu spermija, podrucju oskudnom citoplazmom te u tekucinama akcesornih spolnih žlijezda i epididimisa. Oskudni volumen citoplazme u sredisnjem dijelu spermija, ogranicava i antioksidacijski kapacitet, stoga postoje ograniceni endogeni mehanizmi spermija koji nastoje reparirati nastala ostecenja. Osim navedenog, antioksidacijski enzimi koji se nalaze u sredisnjem dijelu spermija ne mogu osigurati zastitu membranskih lipida u glavi i repu spermija od peroksidativnog ostecenja. Mali antioksidacijski kapacitet spermija kompenziraju antioksidansi iz sjemene plazme, stoga spermiji ovise i o izvanstanicnoj antioksidacijskoj zastiti, koja je u interakciji s biokemijskim sastojcima sjemene plazme. Nadalje, sama prisutnost i koncentracija antioksidansa u spermijima i sjemenoj plazmi razlikuje se među životinjskim vrstama. Zbog svega navedenog, vidljivo je znacenje u održavanju ravnoteže između stvaranja i uklanjanja ROS-a te pravo vrijeme i mjesto stvaranja ROS-a u cilju postizanja optimalne oplodne sposobnosti spermija.

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Primjena ozona u bujatrici

Dražen Đuričić Tomislav Dobranić Hrvoje Valpotić Ivan Folnožić I. Harapin

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Prevalence And Resistance Trends Of Causative Agents Of Bovine Subclinical Mastitis Over A 10-Year Period In Northwestern Croatia

Dražen Đuričić Romana Turk Hrvoje Valpotić Damjan Gračner Luka Cvetnić

Subclinical infection

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Effects of dietary clinoptilolite supplementation on udder health and chemical composition of milk in dairy cows over two consecutive years

Dražen Đuričić Miroslav Benić Nino Mačešić Romana Turk Luka Cvetnić

Udder

Clinoptilolite

Modified milk ingredients

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Prevalence of Ketosis Detected by an Electronic Cow Side Test and its Impact to Days Open on Dairy Cows

International Journal of Veterinary Sciences Research (2021)

Dražen Đuričić Iva Bacan Marko Samardžija

The study aimed to resolve and confirm the previous results of subclinical and clinical ketosis prevalence in northwestern Croatia detected by an electronic cow side test and its impact on days open in dairy herds. Cows (N=559) 2-8 years old from 96 farms located in northwestern Croatia were included in the study. The average milk yield was 7327.80 ± 968.21 kg. The cows were classified into two separate groups: ketotic cows group KET (n=73) with BHBA blood concentration of ≥1.4 mmol/L, and negative NEG (n=486) group with serum BHBA level of <1.4 mmol/L. One droplet of blood from the caudal vein was collect from randomly selected cows in the period 7 to 15 days after parturition. BHBA level determined with Precision Xceed BHBA devices. The period from parturition to first insemination (days open to the first (artificial) insemination, DOFI) was shorter in NEG than in the POS group (110.56±10.65 days vs.114.82±12.23 days, respectively) such as period from parturition to successful conception (days open to successful conception, DOSC), (139.97±15.18 days vs. 127.99±15.87 days, respectively). The prevalence of clinical and subclinical ketosis was 15.02%. Ketosis significantly prolonged days open to first artificial insemination and days open to successful conception in cows from northwestern Croatia.

Ketosis

Subclinical infection

10.18488/journal.110.2021.62.14.18

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