Određivanje optimalne koncentracije Minitube Equex paste za krioprezervaciju sjemena nerasta prema karakteristikama pokretljivosti sperme

Equex paste is a non-permeating cryoprotective agent (CPA) that improved post-thaw survival of spermatozoa during boar semen cryopreservation. However, Equex paste produced by Nova Chemical Sales Inc. (MA, USA) is not currently available. The aim of the present study was to determine the optimal concentration of Minitube Equex paste (Minitube, Tiefenbach, Germany) for boar semen cryopreservation in comparison with Nova Equex STM paste (control). Fifteen ejaculates from 12 mature boars were collected by the glove-hand method. Each ejaculate was aliquoted and cryopreserved in base freezing extender III as Tris-citrate egg yolk (TEY) extender plus 9.0% glycerol classified into four groups. Group I was the control and included only 1.5% Nova Equex STM paste. Groups II, III and IV were the experiment groups, and contained different concentrations of Minitube Equex paste (Group II: 1.5%; Group III: 1.7%; and Group IV: 1.9%) added to the freezing extender III. After freezing and thawing, sperm motility characteristics were evaluated by Sperm Class Analyzer® incubated at 37 °C for 0 (10 min), 1 and 2 h post-thawing. In Group IV after thawing at 0 h, rapid velocity and the velocity curved line were significantly higher than in Groups II and III (P < 0.05) but did not differ from Group I. Moreover, after thawing at 1 h, LIN (linearity) in Group IV was higher than in Group II (P < 0.05), but did not differ from the other groups. In conclusion, the most suitable concentration of Minitube Equex paste in the current protocol was 1.9% supplemented with 9.0% glycerol in TEY-based freezing extender III, based on the conformity between data from manual guides and the observed sperm motility characteristics results.Equex pasta je neprožimajuće kriozaštitno sredstvo (CPA) za koje je dobro poznato da poboljšava preživljavanje spermija nakon odmrzavanja tijekom krioprezervacije sjemena nerasta. Međutim, Equex pasta koju proizvodi tvrtka Nova Chemical Sales Inc. (MA, SAD) trenutno nije dostupna na tržištu. Cilj ove studije bio je odrediti optimalnu koncentraciju Minitube Equex paste (Minitube, Tiefenbach, Njemačka) za krioprezervaciju sjemena nerasta u usporedbi s Nova Equex STM pastom (kontrola). Prikupljeno je petnaest ejakulata 12 zrelih nerasta metodom manualne fiksacije penisa. Svaki ejakulat bio je raspodijeljen i krioprezerviran u osnovnom razrjeđivaču za duboko zamrzavanje III – razrjeđivač trinatrijev citrat s dodatkom žutanjka jajeta (TEY) plus 9,0 % glicerola, razvrstano u četiri skupine (tj. skupine I, II, III i IV). Skupina I: 1,5 % Nova Equex STM pasta (kontrola) i tri različite koncentracije Minitube Equex paste (Skupina II: 1,5 %; Skupina III: 1,7 %; i Skupina IV: 1,9 %) dodano je osnovnom razrjeđivaču za duboko zamrzavanje III. Nakon zamrzavanja i odmrzavanja, karakteristike pokretljivosti spermija procijenjene su pomoću analizatora sperme Sperm Class Analyzer® inkubirano na 37 °C, 0 (10 min), 1 i 2 h nakon odmrzavanja. U Skupini IV, 0 h nakon odmrzavanja, brzina i krivulja brzine bile su značajno više nego u Skupinama II i III (P < 0,05), ali se nisu razlikovale od Skupine I. Nadalje, 1 h nakon odmrzavanja, LIN (linearnost) u Skupini IV bila je veća nego u Skupini II (P < 0,05), ali se nije razlikovala od ostalih skupina. Zaključno, najprikladnija koncentracija Minitube Equex paste u ovom protokolu bila je 1,9 % uz dodatak 9,0 % glicerola u TEY razrjeđivaču za zamrzavanje III, zbog sukladnosti između podataka iz priručnika i zamijećenih rezultata karakteristika pokretljivosti spermija

Usporedba razrijeđivača za duboko smrzavanje sjemena nerasta temeljenih na dodatku žutanjka jajeta i sojinog lecitina

This study investigated the effects of using egg yolk and/or lecithin combinations in semen extender on frozen-thawed boar sperm quality. A total of 19 ejaculates from 8 Duroc boars were included. Each ejaculate was aliquoted and cryopreserved in three different extenders containing only egg yolk (20.0%; group I), only lecithin (6.0%; group II) and a combination of egg yolk (10.0%) and lecithin (3.0%) (group III). Frozen-thawed sperm motility, motion characteristics, viability, acrosome integrity, membrane permeability and mitochondrial activity were evaluated using a computer assisted sperm analysis system, SYBR-14/ Ethidiumhomodimer-1, FITC-PNA, sHOST test and JC-1 staining. The frozen-thawed sperm motility in groups I and III did not differ significantly (P>0.05), though the combination of extenders was better than group II (P<0.05). Motion characteristics, including straight-line velocity (VSL), linearity (LIN) and wobble coefficient (WOB), were higher in groups I and III than in group II (P<0.05). Likewise, sperm viability, membrane permeability and mitochondrial activity were higher in groups I and III than in group II (P<0.05). In conclusion, the use of lecithin without egg yolk in cryopreserved boar semen extender impaired frozen- thawed sperm quality. Thus, using either 20.0% egg yolk or a combination of 10.0% egg yolk and 3.0% lecithin is recommended for cryopreserved boar semen extender.U ovom su radu istraživani učinci žutanjka jajeta i/ili lecitina u razjeđivačima sjemena na kakvoću smrznute-odmrznute sperme nerasta. Uključeno je ukupno 19 ejakulata od 8 nerasta pasmine Duroc. Svaki je ejakulat bio raspodijeljen i zamrznut u 3 različita razrijeđivača, koji su sadržavali dodatak žutanjka jajeta (20,0 %) (skupina I), lecitina (6,0 %) (skupina II) i kombinaciju žutanjka jajeta (10,0 %) i lecitin (3,0 %) (skupina III). Nakon odmrzavanja vrednovane su: pokretljivost spermija, karakteristike gibljivosti, vijabilnost, integritet akrosome, permeabilnost membrane spermija i aktivnost mitohondrija pomoću računalno podržanog sustava za analizu sperme (CASA), SYBR-14/ etidiumhomodimer-1, FITC-PNA, JC-1 bojenja i HOS testa. Po odmrzavanju, pokretljivost spermija u skupinama I i III nisu se značajno razlikovale (P>0,05), ali su oba razrijeđivača bili bolji od skupine II (P<0,05). Karakteristike gibljivosti, uključujući pravocrtnu brzinu (VSL), linearnost (LIN) i koeficijent kolebljivosti (WOB), bili su viši u skupinama I i III u odnosu na skupinu II (P<0,05). Isto tako, vijabilnost spermija, permeabilnost membrane i aktivnost mitohondrija bili su viši u skupinama I i III u odnosu na skupinu II (P<0,05). Zaključno, uporaba lecitina bez žutanjka jajeta u razrjeđivaču za krioprezervaciju sjemena nerasta pogoršala je kvalitete zamrznuto-odmrznutog sjemena. Stoga se preporučuje uporaba 20,0 % žutanjka jajeta ili kombinacije 10,0 % žutanjka jajeta i 3,0 % lecitina kao dodataka razrijeđivaču za duboko smrzavanje sjemena nerasta

Fertilization Rate and Number of Embryos on Day 2 after Intrauterine and Deep Intrauterine Insemination Using Frozen-Thawed Boar Semen in Multiparous Sows

The present study determines fertilization rate and number of embryos on Day 2 after intrauterine insemination (IUI) and deep intrauterine insemination (DIUI) using frozen-thawed (FT) boar semen in multiparous sows. Twelve crossbred Landrace × Yorkshire multiparous sows were included. The sows were inseminated at 24 h after oestrus detection and reinseminated every 12 h until ovulation took place. The inseminations were conducted using IUI with 2 × 109 FT sperm per dose (n = 6) and DIUI with 1 × 109 FT sperm per dose (n = 6). The sows were slaughtered at 45.1 ± 7.2 h after ovulation. Embryos and unfertilized oocytes were flushed from the oviducts. IUI yielded a better fertilization rate than DIUI (66.0% versus 31.0%, P < .001). The number of embryos was 13.5 ± 2.7 and 6.6 ± 3.2 embryos/sow in IUI and DIUI groups, respectively (P = .08). The proportion of sows having unilateral fertilization was higher in the DIUI (3/5) than the IUI group (1/6). In conclusion, IUI with at least 2 × 109 total number of FT boar spermatozoa is recommended

Bacteriospermia and its antimicrobial resistance in relation to boar sperm quality during short-term storage with or without antibiotics in a tropical environment

BackgroundIn tropical environments, boar semen is prepared either from a boar on the same farm as the sow herd or collected in semen collection centers and then transported to other farms. Thus, the semen doses can be used for artificial insemination either immediately or preserved for 2-3 days. The present study investigated the bacteriospermia and its antimicrobial resistance in relation to boar sperm quality during short-term storage in semen extender with or without antibiotics in Thailand.M&MIn total, 20 Duroc ejaculates were collected. Each ejaculate was diluted in Beltsville Thawing Solution extender either with 0.25 g of gentamicin per liter (ANTIBIOTIC) or without gentamicin (NO-ANITIBIOTIC) to create semen doses containing 3,000 x 10(6) sperm/100 mL. These were stored at 17 degrees C for 4 days. Semen characteristics and total bacterial count (CFU per mL, log(10)) were measured after collection and during storage.ResultsSperm viability was decreased by 6.4% for every 1.0 log(10) increase in total bacterial count (p = 0.026) and Staphylococcus spp. were the most frequently isolated across ejaculates. Throughout the 4 days of storage, sperm motility, viability and acrosome integrity in the ANTIBIOTIC group were higher than those in the NO-ANTIBIOTIC group (p 0.05). On the last day of preservation, Globicatella sanguinis (57.2%), Delftia acidovorans (18.9%) and Micrococcus spp. (5.9%) remained as the top three most abundant contaminants in the semen with antibiotic.ConclusionOur findings contribute new insights toward reducing antibiotics as well as rational antibiotic use in the boar AI industry. The growth of bacteria was significantly greater only after 2 days of preservation in the semen without antibiotic. For semen doses diluted from highly viable ejaculates, it is possible to store for 2 days without any antibiotic supplementation. Moreover, bacterial counts increased at the end of storage in the presence of gentamycin, suggesting the loss of bacteriostatic properties of gentamicin to the growth of bacteria during storage

Komparativna studija dviju različitih metoda određivanja integriteta akrosome smrznute pa odmrznute sperme nerasta: bojanje s FITC-PNA/EthD-1 u usporedbi s bojanjem Coomassie plavom

Coomassie blue staining has been reported as an effective and inexpensive method for evaluating the acrosome integrity of spermatozoa, though to date its use to evaluate cryopreserved boar sperm has not been reported. Moreover, there is no information concerning the agreement between Coomassie blue staining and fluorescein isothiocyanate conjugated peanut agglutinin and ethidium homodimer (FITC-PNA/EthD-1) methods for assessing sperm acrosome integrity for any species. The current study was performed to determine the efficacy and agreement between Coomassie blue and FITC-PNA/EthD-1 staining methods for evaluating the acrosome integrity of frozen-thawed boar sperm. A total of 25 semen samples were cryopreserved using lactose-egg yolk-based extender and loaded into 0.5 PVC-French straws. Sperm motility and motion characteristics were determined using a computer-assisted sperm analysis system. Sperm viability and plasma membrane integrity were evaluated using the SYBR-14/EthD-1 and hypo-osmotic swelling test, respectively. Acrosome integrity of frozen-thawed boar sperm was evaluated using both FITC-PNA/EthD-1 and Coomassie blue staining to assess the association between sperm acrosome integrity and agreement between these two methods. The average percent acrosome integrity of frozen-thawed boar sperm as determined by FITC-PNA/ EthD-1 and Coomassie blue staining was 48.8 ± 12.6% and 52.6 ± 13.6%, respectively (P>0.05). Interestingly, Coomassie blue staining found a correlation between sperm viability and acrosome integrity (r=0.609, P=0.002), while FITC-PNA/EthD-1 staining did not (P>0.05). However, the acrosome integrity of frozen-thawed boar sperm evaluated by FITC-PNA/ EthD-1 and Coomassie blue staining was significantly correlated (r=0.448, P=0.025, n=25). The Bland-Altman plot determined that this agreement was acceptable. In conclusion, the acrosome integrity of the frozen-thawed boar sperm assessed via Coomassie blue staining was significantly correlated with that obtained via the FITC-PNA/EthD-1 staining method, and the two methods showed good agreement. Moreover, the significant association between the acrosome integrity of frozen-thawed boar sperm determined by Coomassie blue staining with other sperm quality parameters indicates that this is an effective method for assessing the acrosome integrity of frozen-thawed sperm in pigs.Postoje izvješća da je bojanje Coomassie plavom učinkovita i jeftina metoda procjene integriteta akrosome spermija. Međutim, ne postoje izvješća o bojanju Coomassie plavom za procjenu integriteta akrosome krioprezervirane sperme nerasta. Nadalje, informacije u svezi podudarnosti između bojanja Coomassie plavom i fluorescein izotiocijanatom konjugiranim s aglutininom kikirikija i etidij homodimerom (FITC-PNA/ EthD-1) za procjenu integriteta akrosome spermija nisu dostupne niti za jednu vrstu. Stoga je ova studija provedena za određivanje učinkovitosti i podudarnosti između metoda bojanja Coomassie plavom i bojanja FITC-PNA/EthD-1 za procjenu integriteta akrosome smrznute pa odmrznute sperme nerasta. U eksperiment je uključeno ukupno 25 uzoraka sjemena. Sjeme je krioprezervirano uporabom razrjeđivača na bazi laktoze i žumanjka i pohranjeno u 0,5 PVC-pajete. Svojstva pokretljivosti i gibanja spermija ustvrđena su uporabom sustava za računalno potpomognutu analizu spermija. Vijabilnost spermija i integritet njihove stanične membrane procijenjeni su uporabom SYBR-14/EthD-1, odnosno hipoosmotskim testom bubrenja. Integritet akrosome smrtznute pa odmrznute sperme nerasta procijenjen je uporabom bojanja FITC-PNA/EthD-1 i Coomassie plavom. Procijenjena je povezanost između integriteta akrosome sperme ustvrđene pomoću bojanja FITC-PNA/EthD-1 i Coomassie plavom te podudarnost između dviju metoda mjerenja. Prosječni postotak integriteta akrosome smrznute pa odmrznute sperme nerasta ustvrđene bojanjem FITC-PNA/EthD-1 i Coomassie plavom bio je 48,8 ± 12,6 %, odnosno 52,6 ± 13,6% (P>0,05). Zanimljivo, vijabilnost spermija korelirala je s integritetom akrosome procijenjenom uporabom Coomassie plavom (r=0,609, P=0,002), ali nije korelirala kada je procjenjivana uporabom FITC-PNA/EthD-1 bojanja (P>0,05). Međutim, integritet akrosome smrznute pa odmrznute sperme nerasta procijenjen bojanjem FITC-PNA/EthD-1 i Coomassie plavom značajno je korelirao (r=0,448, P=0,025, n=25). Uz to, podudarnost između bojanja Coomassie plavom i FITC-PNA za procjenu integriteta akrosome smrznute pa odmrznute sperme nerasta ustvrđena Bland- Altmanovim grafikonom bila je prihvatljiva. Zaključno, integritet akrosome smrznute pa odmrznute sperme nerasta procijenjena bojanjem Coomassie plavom značajno je korelirao s onim dobivenim FITC-PNA/EthD- 1 metodom bojanja te su te dvije metode pokazale dobru podudarnost. Uz to, značajna povezanost između integriteta akrosoma smrznute pa odmrznute sperme nerasta koja je ustvrđena bojanjem Coomassie plavom i drugih parametara kakvoće sperme ukazuju na to da je bojanje Coomassie plavom učinkovita metoda procjene integriteta akrosome smrznute pa odmrznute sperme u svinja

Improvement of the frozen boar semen quality by docosahexaenoic acid (DHA) and L-cysteine supplementation

The aim of the present study was to investigate the effect of docosahexaenoic acid and L-cysteine supplementation on qualities of cryopreserved boar semen. A total of 30 ejaculates from 10 Yorkshire boars were included in the study. The semen was cryopreserved in lactose egg yolk base extender containing different concentrations of docosahexaenoic acid (fish oil) or/and L-cysteine : 0 mg and 0 mM (Control), 290 mg and 0 mM (Treatment I), 290 mg and 5 mM (Treatment II) and 290 mg and 10 mM (Treatment III). Post thawing semen qualities (sperm motility, motility patterns, sperm viability, acrosomal integrity, functional plasma membrane integrity and DNA damage) were assessed. The results show that sperm motility and sperm viability were significantly improved by supplementing of docosahexaenoic acid and/or L-cysteine, or their combination if compared to the control group (P &lt; 0.05). The improvement of sperm parameters after supplementation of docosahexaenoic acid or/and Lcysteine, or their combination was more pronounced in the poor freezability sperm rather than at the good one. In poor freezability sperm, the supplementation of docosahexaenoic acid and/or 10 mmol/l Lcysteine resulted with higher sperm motility (34.7 vs. 22.3%, P &lt; 0.001), sperm viability (45.0 vs. 28.1%, P &lt; 0.05) and acrosomal integrity (46.9 vs. 36.2%, P &lt; 0.05) if compared to the control. In conclusion, the supplementation of docosahexaenoic acid, alone or in combination with L-cysteine significantly enhanced the sperm motility, sperm viability and acrosomal integrity of boar sperm after cryopreservation

Razlika između proteina sjemene plazme i proteina sperme za dobru i lošu sposobnost smrzavanja ejakulata nerasta

The present study was performed to compare the expression of sperm proteins, i.e. triosephosphate isomerase (TPI) and acrosin binding protein (ACRBP) and seminal plasma proteins, i.e. glutathione peroxidase 5 (GPX5) and fibronectin 1 (FN1), in boar semen with good, moderate and poor freezability. The study was conducted by determining the protein contents in 32 sperm samples and 38 seminal plasma samples of semen. The ejaculated semen was divided into two portions: the first portion was centrifuged to separate the pellet of sperm from the seminal plasma and the second portion was cryopreserved. After thawing, the ejaculates were classified into three groups according to their post-thawed sperm motility: good (60.2 ± 1.7%), moderate (29.3 ± 2.0%) and poor (16.6 ± 2.2%) freezabilities. The expressions of GPX5 and FN1 in seminal plasma and TPI and ACRBP in sperm were determined using Western blot analysis. It was found that, for sperm proteins, the level of TPI was negatively correlated with the post-thawed total sperm motility (r = -0.38, P = 0.029). For seminal plasma proteins, the level of FN1 in the seminal plasma was positively correlated with the post-thawed total sperm motility (r = 0.37, P = 0.021) and progressive motility (r = 0.39, P = 0.016). The expression of GPX5 was not correlated with any of the frozen–thawed sperm qualities (P > 0.05). In conclusions, boar semen containing a high level of FN1 in seminal plasma has better freezability. Frozen–thawed sperm motility was positively correlated with the level of FN1 in boar seminal plasma and negatively correlated with TPI in boar spermatozoa.Ova studija provedena je u svrhu usporedbe ekspresije proteina sperme, tj. trioza-fosfat izomeraze (TPI) i akrozin-vezujućeg proteina (ACRBP) te proteina sjemene plazme, tj. glutation peroksidaze 5 (GPX5) i fibronektina 1 (FN1), u sjemenu nerasta s dobrom, umjerenom i lošom sposobnošću smrzavanja. Studija je provedena ustvrđivanjem sadržaja proteina u 32 uzorka sperme i 38 uzoraka sjemene plazme sjemena. Ejakulirano sjeme podijeljeno je u dva dijela: prvi dio je centrifugiran za odvajanje taloga sperme od sjemene plazme, a drugi je dio je krioprezerviran. Nakon odmrzavanja u skladu s pokretljivošću spermija nakon odmrzavanja ejakulati su klasificirani u tri skupine: dobra (60,2 ± 1,7%), umjerena (29,3 ± 2,0%) i loša (16,6 ± 2,2%) sposobnost smrzavanja. Ekspresije GPX5 i FN1 u sjemenoj plazmi te TPI i ACRBP u spermi ustvrđene su „Western blot“ analizom. Za proteine sperme je otkriveno da je razina TPI nakon odmrzavanja negativno povezana s ukupnom pokretljivošću sperme (r = -0,38, P = 0,029). Za proteine sjemene plazme, razina FN1 u sjemenoj plazmi nakon odmrzavanja pozitivno je povezana s ukupnom pokretljivošću sperme nakon odmrzavanja (r = 0,37, P = 0,021) i progresivnom pokretljivošću (r = 0,39, P = 0,016). Ekspresija GPX5 nije povezana ni sa kakvim kvalitetama smrznute pa odmrznute sperme (P > 0,05). Zaključno, sjeme nerasta koje sadrži visoku razinu FN1 u sjemenoj plazmi ima bolju sposobnost smrzavanja. Pokretljivost sperme koja je smrznuta pa odmrznuta pozitivno je povezana s razinom FN1 u sjemenoj plazmi nerasta, a negativno s razinom TPI u spermijima nerasta

Newborn traits associated with pre-weaning growth and survival in piglets

Publication history: Accepted - 10 July 2017; Published online - 17 July 2017.Objective: Piglet pre-weaning mortality is an important variable indicating the efficacy of farrowing management and animal well-being during lactation. The present study determined the association of newborn traits measured soon after birth with piglet pre-weaning mortality and growth. Methods: In total, 805 piglets born from 57 multiparous sows were investigated. Their blood oxygen saturation, blood glucose and rectal temperature at 24 h after birth (RT24h) were monitored. Birth order, sex, skin color, integrity of the umbilical cord, attempts to stand and birth intervention were monitored. Piglets were weighed at day 0, 7, and 21 to evaluate average daily gain (ADG). Results: Piglet pre-weaning mortality for lactation period was 12.6% and cumulative mortality during the first 7 days of age was 8.6%. A higher proportion of piglets with pale skin color died compared to piglets with normal skin color (26.7% vs 7.7%, p38.5°C (3.9%). Conclusion: Low BWB and low RT24h compromise piglet survival during the lactation period in the tropical conditions. Piglets in the litters with a high BA, low BWB and low blood glucose have reduced ADG.Financial support for the present study was provided by a grant for International Research Integration: Chula Research Scholar, Ratchadaphiseksomphot Endowment Fund. M. Nuntapaitoon is a grantee of the Research and Researchers for Industries (RRI) Ph.D. program and the Thailand Research Fund, and part of the research grant was supported by the Rachadapisek Sompote Endowment Fund for the 90th Anniversary of Chulalongkorn University. Ramon Muns was supported by the Rachadapisek Sompote Endowment Fund for Postdoctoral Fellowship by Chulalongkorn University

Postotak koncepcije nakon primjene Ovsynch protkola s točno određenim vremenom umjetnog osjemenjivanja s aplikacijom egzogenog progesterona u cikličnih mliječnih krava tijekom toplog i hladnog razdoblja godine

Progesterone plasma levels during the warm period of the year (summer) are more variable and this can induce a reduction in the fertility of dairy cows. Therefore, the aim of this study is to investigate the effect of the combined use of progesterone supplements with an Ovsynch and FTAI protocol on conception rates during the summer in cows. The data were compared with treatments carried out during the cold season (winter). In total, 120 cows underwent oestrus synchronization by using an Ovsynch and FTAI protocol. After this, one group of 60 cows received progesterone supplements and another group of 60 cows did not. In each group, 30 cows were treated during the summer and 30 cows were treated during the winter. All cows were pre-synchronized with PGF2α 25 days and 11 days before starting the Ovsynch protocol. The conception rate at days 30 and 40 post-insemination was not changed by the Ovsynch protocol being supplemented with progesterone. No interaction between progesterone supplementation and the season (winter or summer ) was observed (P=0.17). The results of the study indicate that in cyclic cows with a functional corpus luteum the supplementation of the Ovsynch- FTAI protocol with progesterone did not improve the conception rate during the warm or cold seasons.Koncentracije progesterona u plazmi u mliječnih krava tijekom toplog razdoblja godine (ljeto) više variraju što može prouzročiti njihovu smanjenu plodnost. Stoga je cilj ovoga rada bio istražiti učinak aplikacije egzogenog progesterona u ovsynch protokolu u kombinaciji s točno određenim vremenom umjetnog osjemenjivanja (TOVO) na postotak koncepcije u mliječnih krava tijekom ljetnog razdoblja. Podatci su bili uspoređeni s istom kombinacijom protokola tijekom hladnog razdoblja godine (zima). Ukupno je u 120 krava sinkroniziran estrus klasičnim ovsynch i TOVO protokolom. Nakon toga, u 60 krava je apliciran egzogeni progesteron, dok u ostalih 60 krava nije apliciran spomenuti pripravak. U svakoj je skupini 30 krava tretirano tijekom ljeta i 30 krava tijekom zimskog razdoblja. Sve su krave bile podvrgnute postupku presinkronizacije s PGF2α 25 dana i 11 dana prije početka ovsynch protokola. Aplikacija egzogenog progesterona u kombinaciji s ovsynch protokolom 30. i 40. dana nakon umjetnog osjemenjivanja nije utjecala na postotak koncepcije. Nije ustavljena značajna povezanost između dodatka egzogenog progesterona i godišnjeg doba (zima ili ljeto)(P=0.17). Rezultati ovog istraživanja pokazali su da aplikacijom egzogenog progesterona u kombinaciji s ovsynch-TOVUO protokolom nije poboljšao postotak koncepcije u krava s cikličnom aktivnosti jajnika (funkcionalno žuto tijelo) tijekom toplog ili hladnog dijela godine

Usporedba razrijeđivača za duboko smrzavanje sjemena nerasta temeljenih na dodatku žutanjka jajeta i sojinog lecitina

This study investigated the effects of using egg yolk and/or lecithin combinations in semen extender on frozen-thawed boar sperm quality. A total of 19 ejaculates from 8 Duroc boars were included. Each ejaculate was aliquoted and cryopreserved in three different extenders containing only egg yolk (20.0%; group I), only lecithin (6.0%; group II) and a combination of egg yolk (10.0%) and lecithin (3.0%) (group III). Frozen-thawed sperm motility, motion characteristics, viability, acrosome integrity, membrane permeability and mitochondrial activity were evaluated using a computer assisted sperm analysis system, SYBR-14/ Ethidiumhomodimer-1, FITC-PNA, sHOST test and JC-1 staining. The frozen-thawed sperm motility in groups I and III did not differ significantly (P>0.05), though the combination of extenders was better than group II (P<0.05). Motion characteristics, including straight-line velocity (VSL), linearity (LIN) and wobble coefficient (WOB), were higher in groups I and III than in group II (P<0.05). Likewise, sperm viability, membrane permeability and mitochondrial activity were higher in groups I and III than in group II (P<0.05). In conclusion, the use of lecithin without egg yolk in cryopreserved boar semen extender impaired frozen- thawed sperm quality. Thus, using either 20.0% egg yolk or a combination of 10.0% egg yolk and 3.0% lecithin is recommended for cryopreserved boar semen extender.U ovom su radu istraživani učinci žutanjka jajeta i/ili lecitina u razjeđivačima sjemena na kakvoću smrznute-odmrznute sperme nerasta. Uključeno je ukupno 19 ejakulata od 8 nerasta pasmine Duroc. Svaki je ejakulat bio raspodijeljen i zamrznut u 3 različita razrijeđivača, koji su sadržavali dodatak žutanjka jajeta (20,0 %) (skupina I), lecitina (6,0 %) (skupina II) i kombinaciju žutanjka jajeta (10,0 %) i lecitin (3,0 %) (skupina III). Nakon odmrzavanja vrednovane su: pokretljivost spermija, karakteristike gibljivosti, vijabilnost, integritet akrosome, permeabilnost membrane spermija i aktivnost mitohondrija pomoću računalno podržanog sustava za analizu sperme (CASA), SYBR-14/ etidiumhomodimer-1, FITC-PNA, JC-1 bojenja i HOS testa. Po odmrzavanju, pokretljivost spermija u skupinama I i III nisu se značajno razlikovale (P>0,05), ali su oba razrijeđivača bili bolji od skupine II (P<0,05). Karakteristike gibljivosti, uključujući pravocrtnu brzinu (VSL), linearnost (LIN) i koeficijent kolebljivosti (WOB), bili su viši u skupinama I i III u odnosu na skupinu II (P<0,05). Isto tako, vijabilnost spermija, permeabilnost membrane i aktivnost mitohondrija bili su viši u skupinama I i III u odnosu na skupinu II (P<0,05). Zaključno, uporaba lecitina bez žutanjka jajeta u razrjeđivaču za krioprezervaciju sjemena nerasta pogoršala je kvalitete zamrznuto-odmrznutog sjemena. Stoga se preporučuje uporaba 20,0 % žutanjka jajeta ili kombinacije 10,0 % žutanjka jajeta i 3,0 % lecitina kao dodataka razrijeđivaču za duboko smrzavanje sjemena nerasta