Leptin and IGF-I improve bovine embryo quality in vitro

The in vitro embryo culture systems need further improvement to enhance the efficiency of bovine embryo production. Growth factors play key roles in embryo production and quality. The objective of this study was to define the effects of leptin, insulin-like growth factor-1 (IGF-1), and their combination on embryonic development, apoptosis, and expression profiles of a panel of developmentally important genes during 8-day embryo culture. The oocytes were aspirated from slaughterhouse ovaries of mixed breed cows. Following IVM/IVF presumptive zygotes were obtained. To accomplish this objective, presumptive zygotes (16-18 h post-insemination) were cultured in vitro as control (no supplementation, n = 349), 5 ng/ml leptin (Group I, n = 322), 100 ng/ml IGF-1 (Group II, n = 347), and 5 ng/ml leptin and 100 ng/ml IGF-1 (Group III, n = 360). All groups were supplemented with 10% fetal calf serum (FCS) on Day 4, and blastocysts were harvested on day 8. The DNA fragmented nuclei of blastocyst were determined by terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) assay and expression profiles of a panel of developmentally important genes were assayed by real-time polymerase chain reaction (RT-PCR). The cleavage rate and embryo development to 8-16 cell stage were higher in groups II and III as compared to control (P < 0.05), respectively. Percentage of blastocyst and mean cell numbers per blastocyst did not differ among the groups. Addition of IGF-I and/or combination with leptin decreased the number of nuclei with fragmented DNA (P < 0.01) as compared to the control group. Although the expression of glucose transporter 1 (Glut1), desmosomal glycoprotein desmocollin III (DcIII) and insulin like growth factor 2receptor (Igf2r) transcripts did not change among thegroups, interferon-tau (IF-tau) and DNAmethyltransferase 3A (Dnmt3a) were down-regulated ingroup II while heat shock protein-70 (Hsp70) and IF-tauwere up regulated in group III.[...](AU)

Leptin and IGF-I improve bovine embryo quality in vitro

The in vitro embryo culture systems need further improvement to enhance the efficiency of bovine embryo production. Growth factors play key roles in embryo production and quality. The objective of this study was to define the effects of leptin, insulin-like growth factor-1 (IGF-1), and their combination on embryonic development, apoptosis, and expression profiles of a panel of developmentally important genes during 8-day embryo culture. The oocytes were aspirated from slaughterhouse ovaries of mixed breed cows. Following IVM/IVF presumptive zygotes were obtained. To accomplish this objective, presumptive zygotes (16-18 h post-insemination) were cultured in vitro as control (no supplementation, n = 349), 5 ng/ml leptin (Group I, n = 322), 100 ng/ml IGF-1 (Group II, n = 347), and 5 ng/ml leptin and 100 ng/ml IGF-1 (Group III, n = 360). All groups were supplemented with 10% fetal calf serum (FCS) on Day 4, and blastocysts were harvested on day 8. The DNA fragmented nuclei of blastocyst were determined by terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) assay and expression profiles of a panel of developmentally important genes were assayed by real-time polymerase chain reaction (RT-PCR). The cleavage rate and embryo development to 8-16 cell stage were higher in groups II and III as compared to control (P < 0.05), respectively. Percentage of blastocyst and mean cell numbers per blastocyst did not differ among the groups. Addition of IGF-I and/or combination with leptin decreased the number of nuclei with fragmented DNA (P < 0.01) as compared to the control group. Although the expression of glucose transporter 1 (Glut1), desmosomal glycoprotein desmocollin III (DcIII) and insulin like growth factor 2receptor (Igf2r) transcripts did not change among thegroups, interferon-tau (IF-tau) and DNAmethyltransferase 3A (Dnmt3a) were down-regulated ingroup II while heat shock protein-70 (Hsp70) and IF-tauwere up regulated in group III.[...]

Semen traits, testicular morphometry and histopathology of cadmium-exposed rabbit bucks administered methanolic extract of Phoenix dactylifera fruit / Características do sêmen, morfometria testicular e histopatologia de cadáveres de coelho expostos, administrado extrato metanólico de frutos de Phoenix dactylifera

This study evaluated the effect of Cd on some male reproductive parameters; and explored the therapeutic potentials of methanolic extract of Phoenix dactylifera (MEPD) fruit in averting such reproductive damages. 45 rabbit bucks aged 24-28 weeks and weighing 1.41-1.43 kg was used. The rabbits were assigned to 5 treatment groups (control, Cd-only, Cd + 300 mg MEPD, Cd + 600 mg MEPD and Cd + 900 mg MEPD) in a completely randomized design. The rabbits were dosed with 3 mg CdCl2 kg-1feed for 7 days followed by MEPD for 56 days after every 72 hours. Result of semen evaluation indicates that semen volume, motility, libido, concentration, total ejaculate, viability and morphology were significantly reduced by Cd compared to the normal control group. Testis density and epididymis length of the control rabbits were significantly different from the Cd-only exposed rabbits. Histopathological examination revealed severe testicular damage due to Cd. Indeed, treatment with MEPD significantly reversed the deleterious reproductive effects caused by Cd. In conclusion, cadmium drastically affected the testis of rabbits and treatment with MEPD alleviated some deleterious effects.

Este estudo avaliou o efeito da Cd em alguns parâmetros reprodutivos masculinos e explorou os potenciais terapêuticos de extrato metanólico de Phoenix dactylifera (MEPD), fruto na prevenção de tais danos reprodutivos. Foram utilizados 45 machos de coelho com idade entre 24-28 semanas e pesando 1,41- 1,43 kg. Os coelhos foram designados a cinco grupos de tratamento (controle, Cd-apenas, Cd+300 mg MEPD, Cd+600 mg MEPD e Cd+900 mg MEPD) num delineamento inteiramente casualizado. Os coelhos foram doseados com 3 mg de CdCl2 kg-1 de alimento durante sete dias seguido por MEPD durante 56 dias após cada 72h. O resultado da avaliação do sêmen indica que o volume de sêmen, a motilidade, a libido, a concentração, a ejaculação total, a viabilidade e a morfologia foram significativamente reduzidos pelo Cd em comparação com o grupo controle normal. A densidade do testículo e o comprimento do epidídimo dos coelhos de controle foram significativamente diferentes dos coelhos expostos. O exame histopatológico revelou dano testicular grave devido ao Cd. Na verdade, o tratamento com MEPD reverteu significativamente os efeitos deletérios reprodutivos causados por Cd. Em conclusão, o cádmio afetou muito os testículos de coelhos e o tratamento com MEPD aliviou alguns efeitos deletérios.

Semen traits, testicular morphometry and histopathology of cadmium-exposed rabbit bucks administered methanolic extract of Phoenix dactylifera fruit / Características do sêmen, morfometria testicular e histopatologia de cadáveres de coelho expostos, administrado extrato metanólico de frutos de Phoenix dactylifera

This study evaluated the effect of Cd on some male reproductive parameters; and explored the therapeutic potentials of methanolic extract of Phoenix dactylifera (MEPD) fruit in averting such reproductive damages. 45 rabbit bucks aged 24-28 weeks and weighing 1.41-1.43 kg was used. The rabbits were assigned to 5 treatment groups (control, Cd-only, Cd + 300 mg MEPD, Cd + 600 mg MEPD and Cd + 900 mg MEPD) in a completely randomized design. The rabbits were dosed with 3 mg CdCl2 kg-1feed for 7 days followed by MEPD for 56 days after every 72 hours. Result of semen evaluation indicates that semen volume, motility, libido, concentration, total ejaculate, viability and morphology were significantly reduced by Cd compared to the normal control group. Testis density and epididymis length of the control rabbits were significantly different from the Cd-only exposed rabbits. Histopathological examination revealed severe testicular damage due to Cd. Indeed, treatment with MEPD significantly reversed the deleterious reproductive effects caused by Cd. In conclusion, cadmium drastically affected the testis of rabbits and treatment with MEPD alleviated some deleterious effects.(AU)

Este estudo avaliou o efeito da Cd em alguns parâmetros reprodutivos masculinos e explorou os potenciais terapêuticos de extrato metanólico de Phoenix dactylifera (MEPD), fruto na prevenção de tais danos reprodutivos. Foram utilizados 45 machos de coelho com idade entre 24-28 semanas e pesando 1,41- 1,43 kg. Os coelhos foram designados a cinco grupos de tratamento (controle, Cd-apenas, Cd+300 mg MEPD, Cd+600 mg MEPD e Cd+900 mg MEPD) num delineamento inteiramente casualizado. Os coelhos foram doseados com 3 mg de CdCl2 kg-1 de alimento durante sete dias seguido por MEPD durante 56 dias após cada 72h. O resultado da avaliação do sêmen indica que o volume de sêmen, a motilidade, a libido, a concentração, a ejaculação total, a viabilidade e a morfologia foram significativamente reduzidos pelo Cd em comparação com o grupo controle normal. A densidade do testículo e o comprimento do epidídimo dos coelhos de controle foram significativamente diferentes dos coelhos expostos. O exame histopatológico revelou dano testicular grave devido ao Cd. Na verdade, o tratamento com MEPD reverteu significativamente os efeitos deletérios reprodutivos causados por Cd. Em conclusão, o cádmio afetou muito os testículos de coelhos e o tratamento com MEPD aliviou alguns efeitos deletérios.(AU)

Influence of the protein content of boar seminal plasma on spermatozoa viability, motility and acrosome integrity in diluted semen stored for 3 days

The aim of the present study was to investigate the influence of the protein content of seminal plasma on the motility, viability and acrosome integrity of spermatozoa in extended semen stored for 3 days. A total of 32 semen samples (from four boars) with high (4 mg/ml) and 32 semen samples (from four boars) with low (2 mg/ml) protein content were investigated. The semen samples were diluted by BTS at a ratio of 1:4, and stored for 72 h at 17o C. The percentages of live sperm (LS), live sperm with damaged acrosome (LDA) and total sperm with damaged acrosome (TDA) were detected by flow cytometry. Sperm progressive motility (PM) was detected using CASA. After 72 h of storage, the percentage of LS and PM was significantly (P < 0.01) higher, and the LDA and TDA were significantly (P < 0.01) lower in samples with high protein content than in the samples with low protein content (LS = 66 vs. 44%, PM = 64 vs. 48%, LDA = 15 vs. 21% and TDA = 29 vs. 45%, respectively). When comparing the difference between 0 and 72 h of storage, the percentage decrease in LS and PM, while increase in LDA and TDA were significantly higher in the samples with low (LS: 75 to 44%; PM: 68 to 48%; LDA: 11 to 21% and TDA: 23 to 45%) than in the samples with high protein content (LS: 78 to 66%; PM: 70 to 64%; LDA: 9 to 15% and TDA: 17 to 29%). We concluded that protein content in seminal plasma has a significant influence on progressive motility, viability and acrosome integrity in diluted semen stored for 3 days.(AU)

Influence of the protein content of boar seminal plasma on spermatozoa viability, motility and acrosome integrity in diluted semen stored for 3 days

The aim of the present study was to investigate the influence of the protein content of seminal plasma on the motility, viability and acrosome integrity of spermatozoa in extended semen stored for 3 days. A total of 32 semen samples (from four boars) with high (4 mg/ml) and 32 semen samples (from four boars) with low (2 mg/ml) protein content were investigated. The semen samples were diluted by BTS at a ratio of 1:4, and stored for 72 h at 17o C. The percentages of live sperm (LS), live sperm with damaged acrosome (LDA) and total sperm with damaged acrosome (TDA) were detected by flow cytometry. Sperm progressive motility (PM) was detected using CASA. After 72 h of storage, the percentage of LS and PM was significantly (P < 0.01) higher, and the LDA and TDA were significantly (P < 0.01) lower in samples with high protein content than in the samples with low protein content (LS = 66 vs. 44%, PM = 64 vs. 48%, LDA = 15 vs. 21% and TDA = 29 vs. 45%, respectively). When comparing the difference between 0 and 72 h of storage, the percentage decrease in LS and PM, while increase in LDA and TDA were significantly higher in the samples with low (LS: 75 to 44%; PM: 68 to 48%; LDA: 11 to 21% and TDA: 23 to 45%) than in the samples with high protein content (LS: 78 to 66%; PM: 70 to 64%; LDA: 9 to 15% and TDA: 17 to 29%). We concluded that protein content in seminal plasma has a significant influence on progressive motility, viability and acrosome integrity in diluted semen stored for 3 days.

Seminal characteristics and sperm membrane bulls supplemented with tocopherol / Características seminais e de membrana espermática em touros suplementados com tocoferol

This study had objective to evaluate the integrity of the plasma membrane and semen quality of bulls supplemented with tocopherol. Bulls were used 16 with an average age of 24 months and average weight of 462.2 kg in two treatments: control group (CG) and group supplemented with tocopherol (GE-400 IU of tocoferol/animal / day) added to the concentrate supplement. The groups were kept in pasture supplemented with 4.5 kg / animal / day concentrate. Tocopherol supplementation was provided for 60 days. 4 semen samples were carried out: on days 0 , 30, 60 and 15 days after the end of supplementation. Semen was collected by electroejaculation , it has measured up the physical and morphological sperm characteristics. To assess the integrity of membrane used the hyposmotic test, eosin / nigrosine, Pope and trypan blue. The experiment was conducted in a completely randomized design with repeated measurements over time. Data were analyzed using ANOVA and SNK test with a 5% significance level with assistance from the SAS statistical program. It found effect of supplementation  force (p = 0.0183) (CG = 2.71 ± 0.095 and GE = 2.23 ± 0.16) ;. There were no differences (p > 0.05) for the other variables: motility, concentration, morphology, acrosome integrity, sperm viability and membrane integrity. With the results obtained in the experimental conditions of this study, it is concluded that

O trabalho teve como objetivo avaliar a integridade da membrana plasmática e qualidade seminal de touros suplementados com tocoferol. Foram utilizados 16 touros  com idade média de 24 meses e peso médio de 462,2kg, em dois tratamentos: grupo controle (GC) e grupo suplementado com tocoferol (GE- 400 UI de tocoferol/ animal/dia) adicionados ao suplemento concentrado. Os grupos foram mantidos em pastejo com suplementação de 4,5kg/ animal/ dia de concentrado. A suplementação com tocoferol foi fornecida por 60 dias. Foram realizadas 4 coletas de sêmen, sendo: nos dias 0, 30, 60 e 15 dias após o término da suplementação. O sêmen foi coletado por eletroejaculação, aferiu-se as características físicas e morfológicas. Para avaliar a integridade de membrana utilizou-se o teste hiposmótico, coloração eosina/ nigrosina,  coloração Pope e trypan blue. Os dados foram analisados através da ANOVA e do teste SNK com um nível de significância de 5%. Foi encontrado efeito da suplementação para vigor (p = 0,0183) (GC = 2,71±0,095 e GE = 2,23±0,16). Não foram encontradas diferenças (p > 0,05) para as demais variáveis: volume, motilidade, concentração, morfologia, integridade acrossomal, viabilidade espermática e integridade de membrana. Com os resultados obtidos, nas condições experimentais do presente trabalho, conclui-se que a suplementação oral com tocoferol de 400UI/dia não apresenta melhori

Seminal characteristics and sperm membrane bulls supplemented with tocopherol / Características seminais e de membrana espermática em touros suplementados com tocoferol

This study had objective to evaluate the integrity of the plasma membrane and semen quality of bulls supplemented with tocopherol. Bulls were used 16 with an average age of 24 months and average weight of 462.2 kg in two treatments: control group (CG) and group supplemented with tocopherol (GE-400 IU of tocoferol/animal / day) added to the concentrate supplement. The groups were kept in pasture supplemented with 4.5 kg / animal / day concentrate. Tocopherol supplementation was provided for 60 days. 4 semen samples were carried out: on days 0 , 30, 60 and 15 days after the end of supplementation. Semen was collected by electroejaculation , it has measured up the physical and morphological sperm characteristics. To assess the integrity of membrane used the hyposmotic test, eosin / nigrosine, Pope and trypan blue. The experiment was conducted in a completely randomized design with repeated measurements over time. Data were analyzed using ANOVA and SNK test with a 5% significance level with assistance from the SAS statistical program. It found effect of supplementation  force (p = 0.0183) (CG = 2.71 ± 0.095 and GE = 2.23 ± 0.16) ;. There were no differences (p > 0.05) for the other variables: motility, concentration, morphology, acrosome integrity, sperm viability and membrane integrity. With the results obtained in the experimental conditions of this study, it is concluded that(AU)

O trabalho teve como objetivo avaliar a integridade da membrana plasmática e qualidade seminal de touros suplementados com tocoferol. Foram utilizados 16 touros  com idade média de 24 meses e peso médio de 462,2kg, em dois tratamentos: grupo controle (GC) e grupo suplementado com tocoferol (GE- 400 UI de tocoferol/ animal/dia) adicionados ao suplemento concentrado. Os grupos foram mantidos em pastejo com suplementação de 4,5kg/ animal/ dia de concentrado. A suplementação com tocoferol foi fornecida por 60 dias. Foram realizadas 4 coletas de sêmen, sendo: nos dias 0, 30, 60 e 15 dias após o término da suplementação. O sêmen foi coletado por eletroejaculação, aferiu-se as características físicas e morfológicas. Para avaliar a integridade de membrana utilizou-se o teste hiposmótico, coloração eosina/ nigrosina,  coloração Pope e trypan blue. Os dados foram analisados através da ANOVA e do teste SNK com um nível de significância de 5%. Foi encontrado efeito da suplementação para vigor (p = 0,0183) (GC = 2,71±0,095 e GE = 2,23±0,16). Não foram encontradas diferenças (p > 0,05) para as demais variáveis: volume, motilidade, concentração, morfologia, integridade acrossomal, viabilidade espermática e integridade de membrana. Com os resultados obtidos, nas condições experimentais do presente trabalho, conclui-se que a suplementação oral com tocoferol de 400UI/dia não apresenta melhori(AU)

Seminal and spermatic characteristics of fresh semen and the effects of sperm cooling in Steindachneridion melanodermatum (Garavello, 2005) / Características seminais e espermáticas e os efeitos do resfriamento de esperma do Steindachneridion melanodermatum (Garavello, 2005) sobre os parâmetros espermáticos

This study describes the seminal and spermatic characteristics of fresh semen of Steindachneridion melanodermatum and investigates the effects of dilution, temperature, and storage period on its spermatic parameters. Sperm samples were collected from nine hormonally-induced males. The following parameters in fresh sperm were analyzed: seminal plasma osmolality (OSM), seminal pH, sperm motility (MOT), sperm velocity (SV) (including sperm curvilinear velocity (CVV), sperm straight-line velocity (SLV), and sperm average path velocity (APV)), total time of sperm motility (TEMP), sperm concentration (CONC), and index of sperm normality (NORM). Sperm samples from each male were diluted in a solution containing 5% fructose and 5% powdered milk, and stored at 10C and 25C. The same was carried out for sperm samples not subjected to dilution. From these samples, MOT, CVV, SLV, APV, SV, and TEMP were measured after 0 h, 5 h, 9 h, 18 h, 27 h, 36 h, 45 h, and 54 h. Males released 11.74 ± 5.38 mL of sperm, with an osmolality of 258.78 ± 29.36 mOsm.kg-1 and pH of 7.11 ± 0.31. The sperm presented a MOT of 99.86 ± 0.31% at a concentration of 1.03 × 1010 ± 3.65 × 109 spermatozoa.mL-1 with CVV of 185.58 ± 14.11 ?m.s-1, SLV of 49.15 ± 4.66 ?m.s-1, APV of 87.02 ± 4.13 ?m.s-1, SV of 106.52 ± 4.45 ?m.s-1, TEMP of 79.31 ± 5.62 s, NORM of 75.81 ± 5.71%. The resultsindicate that sperm motility, sperm velocity, and total time of sperm activation were affected by dilution,storage temperature, and storage period (p < 0.05). Procedures for semen storage should be performed with undiluted sperm cooled at 10°C, or kept undiluted at 25°C for up to 27h.

O objetivo deste estudo foi descrever os parâmetros seminais e espermáticos no sêmen fresco do Steindachneridion melanodermatum e os efeitos da diluição, da temperatura e do tempo de estocagem do sêmen sobre os parâmetros espermáticos. Foi coletado o sêmen de nove machos, induzidos hormonalmente. No sêmen fresco foram avaliados os parâmetros: osmolaridade do plasma seminal (OSM), pH seminal (pH), motilidade (MOT) e velocidades espermáticas (VCL, VLR, VMD, VE), tempo total de motilidade espermática (TEMP), concentração espermática e índice de normalidade espermática (NORM). De cada macho, amostras de sêmen que foram diluídas em solução contendo 5% de frutose e 5% de leite em pó e, armazenadas a 10 e 25ºC. O mesmo foi feito para amostras de sêmen não submetidas à diluição. Destas amostras, as MOT, VCL, VLR, VMD, VE, TEMP foram mensuradas após 0, 5, 9, 18, 27, 36, 45, 54 horas. Os machos liberaram 11,74 ± 5,38 mL de sêmen com 258,78 ± 29,36mOsm.kg-1 e pH de 7,11 ± 0,31. O sêmen apresentou 99,86 ± 0,31% de MOT, com 1,03x1010 ± 3,65x109 espermatozódes.mL-1 e, 185,58 ± 14,11?m.s-1 para VCL, 49,15 ± 4,66?m.s-1 para VLR, 87,02 ± 4,13 ?m.s-1 para VMD, 106,52 ± 4,45?m.s-1 para VE, 79,31 ± 5,62s para TEMP e 75,81 ± 5,71% de NORM. A motilidade, as velocidades e o tempo total de motilidade espermática foram influenciados (p 0,05) pela diluição, pelas temperaturas e tempos de armazenamento. A estocagem do sêmen poderá ser realizado sem diluição e resfriado a 10oC ou sem diluição, a temperatura de 25oC, pelo período deaté 27 horas.

Seminal and spermatic characteristics of fresh semen and the effects of sperm cooling in Steindachneridion melanodermatum (Garavello, 2005) / Características seminais e espermáticas e os efeitos do resfriamento de esperma do Steindachneridion melanodermatum (Garavello, 2005) sobre os parâmetros espermáticos

This study describes the seminal and spermatic characteristics of fresh semen of Steindachneridion melanodermatum and investigates the effects of dilution, temperature, and storage period on its spermatic parameters. Sperm samples were collected from nine hormonally-induced males. The following parameters in fresh sperm were analyzed: seminal plasma osmolality (OSM), seminal pH, sperm motility (MOT), sperm velocity (SV) (including sperm curvilinear velocity (CVV), sperm straight-line velocity (SLV), and sperm average path velocity (APV)), total time of sperm motility (TEMP), sperm concentration (CONC), and index of sperm normality (NORM). Sperm samples from each male were diluted in a solution containing 5% fructose and 5% powdered milk, and stored at 10C and 25C. The same was carried out for sperm samples not subjected to dilution. From these samples, MOT, CVV, SLV, APV, SV, and TEMP were measured after 0 h, 5 h, 9 h, 18 h, 27 h, 36 h, 45 h, and 54 h. Males released 11.74 ± 5.38 mL of sperm, with an osmolality of 258.78 ± 29.36 mOsm.kg-1 and pH of 7.11 ± 0.31. The sperm presented a MOT of 99.86 ± 0.31% at a concentration of 1.03 × 1010 ± 3.65 × 109 spermatozoa.mL-1 with CVV of 185.58 ± 14.11 ?m.s-1, SLV of 49.15 ± 4.66 ?m.s-1, APV of 87.02 ± 4.13 ?m.s-1, SV of 106.52 ± 4.45 ?m.s-1, TEMP of 79.31 ± 5.62 s, NORM of 75.81 ± 5.71%. The resultsindicate that sperm motility, sperm velocity, and total time of sperm activation were affected by dilution,storage temperature, and storage period (p < 0.05). Procedures for semen storage should be performed with undiluted sperm cooled at 10°C, or kept undiluted at 25°C for up to 27h.(AU)

O objetivo deste estudo foi descrever os parâmetros seminais e espermáticos no sêmen fresco do Steindachneridion melanodermatum e os efeitos da diluição, da temperatura e do tempo de estocagem do sêmen sobre os parâmetros espermáticos. Foi coletado o sêmen de nove machos, induzidos hormonalmente. No sêmen fresco foram avaliados os parâmetros: osmolaridade do plasma seminal (OSM), pH seminal (pH), motilidade (MOT) e velocidades espermáticas (VCL, VLR, VMD, VE), tempo total de motilidade espermática (TEMP), concentração espermática e índice de normalidade espermática (NORM). De cada macho, amostras de sêmen que foram diluídas em solução contendo 5% de frutose e 5% de leite em pó e, armazenadas a 10 e 25ºC. O mesmo foi feito para amostras de sêmen não submetidas à diluição. Destas amostras, as MOT, VCL, VLR, VMD, VE, TEMP foram mensuradas após 0, 5, 9, 18, 27, 36, 45, 54 horas. Os machos liberaram 11,74 ± 5,38 mL de sêmen com 258,78 ± 29,36mOsm.kg-1 e pH de 7,11 ± 0,31. O sêmen apresentou 99,86 ± 0,31% de MOT, com 1,03x1010 ± 3,65x109 espermatozódes.mL-1 e, 185,58 ± 14,11?m.s-1 para VCL, 49,15 ± 4,66?m.s-1 para VLR, 87,02 ± 4,13 ?m.s-1 para VMD, 106,52 ± 4,45?m.s-1 para VE, 79,31 ± 5,62s para TEMP e 75,81 ± 5,71% de NORM. A motilidade, as velocidades e o tempo total de motilidade espermática foram influenciados (p 0,05) pela diluição, pelas temperaturas e tempos de armazenamento. A estocagem do sêmen poderá ser realizado sem diluição e resfriado a 10oC ou sem diluição, a temperatura de 25oC, pelo período deaté 27 horas.(AU)

Seminal characteristics of piabanha before and after induction with different hormones / Características seminais de piabanha antes e após a indução com diferentes hormônios

The migratory species piabanha does not reproduce in lentic environments since it requires environmental stimuli for the maturation and extrusion of gametes, and therefore hormonal induction is mandatory. Current study compares the seminal characteristics of Brycon insignis without any hormonal induction (Control - Ctrl) and with two types of hormonal inductors, or rather, carp pituitary extract (T1 - 2.5 mg kg-1 body weight) and GnRH analogues, the latter applied in two different concentrations (T2 - 0.7 mg kg-1 body weight and T3 - 1.4 mg kg-1 body weight). Post-induction analyses showed that the hormones increased the motility rate - Ctrl (95%), T1 (100%), T2 (100%) and T3 (98%), although sperm concentration - Ctrl (11.52 x 109); T1 (4.37 x 109); T2 (4.34 x 109); T3 (4.01 x 109) decreased. Assessments for sperm vigor, motility time and spermatic morphology did not vary with hormonal induction. Hormonal inducer does not alter negatively the seminal characteristics of the piabanha, and the choice for the proper hormone depends on the preference of the dispenser. (AU)

A espécie migradora piabanha não possui a capacidade de reproduzir em ambientes lênticos devido à necessidade de estímulos ambientais para a maturação e extrusão dos gametas, por isso a necessidade da indução hormonal. No presente estudo, as características seminais do Brycon insignis foram comparadas sem indução hormonal (Ctrl) e utilizando dois tipos de indutores hormonais - Extrato de Hipófise de Carpa (T1 - 2,5 mg kg-1 de peso vivo) e Análogos de GnRH, sendo este último aplicado em duas concentrações distintas (T2 - 0,7 mg kg-1 de peso vivo e T3 - 1,4 mg kg-1 de peso vivo). As análises realizadas após a indução mostraram que os hormônios utilizados produziram um aumento da taxa de motilidade - Ctrl (95%), T1 (100%), T2 (100%) e T3 (98%), porém houve uma diminuição na concentração espermática - Ctrl (11,52 x 109 ), T1 (4,37 x 109 ), T2 (4,34 x 109 ) e T3 (4,01 x 109 ). Os restantes das avaliações, vigor espermático, tempo de motilidade e morfologia espermática não apresentaram variações com a indução hormonal. Portanto, a utilização do indutor hormonal não altera negativamente as características seminais de piabanha, e a escolha do mesmo se deve à preferência do manipulador.(AU)