Academic literature on the topic 'Semen de Carnero'
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Journal articles on the topic "Semen de Carnero"
Castillo Cevallos, Luis Antonio, Enrique Páucar Espinoza, and Enrique Alvarado Malca. "Adición de metil-β-ciclodextrina cargada de colesterol en la criopreservación de semen de carnero." Revista de Investigaciones Veterinarias del Perú 30, no. 4 (February 4, 2020): 1637–44. http://dx.doi.org/10.15381/rivep.v30i4.17160.
Full textFerruccio Accame, O. "Efectos de presiones barométricas bajas sobre el semen del carnero." Anales de la Facultad de Medicina 28, no. 2 (October 18, 2014): 65. http://dx.doi.org/10.15381/anales.v28i2.9643.
Full textOrihuela Trujillo, Agustín. "La conducta sexual del carnero. Revisión." Revista Mexicana de Ciencias Pecuarias 5, no. 1 (June 7, 2014): 49. http://dx.doi.org/10.22319/rmcp.v5i1.3217.
Full textHuanca L., Wilfredo, Luis Coronado S., and David B. Galloway. "Efecto de la Manipulación de la Temperatura Escrotal sobre las Características Clínicas, Seminales y Endocrinas en Carneros." Revista de Investigaciones Veterinarias del Perú 26, no. 4 (December 31, 2015): 604. http://dx.doi.org/10.15381/rivep.v26i4.11217.
Full textCastro Bedriñana, Jorge Isaac, Doris Maritza Chirinos Peinado, and Javier Angel Chirinos Orellana. "Calidad del Semen Refrigerado de Carneros Assaf y Blackbelly." Revista de Investigaciones Veterinarias del Perú 28, no. 3 (October 11, 2017): 764. http://dx.doi.org/10.15381/rivep.v28i3.12581.
Full textSan Martín, Mauricio, and Jorge Atkins. "Estudios sobre la fertilidad del ganado lanar en la altura." Anales de la Facultad de Medicina 25, no. 1 (October 18, 2014): 41. http://dx.doi.org/10.15381/anales.v25i1.9705.
Full textMonge M., Carlos. "Fisiología de la reproducción en la altura aplicaciones a la industria animal." Anales de la Facultad de Medicina 25, no. 1 (October 18, 2014): 19. http://dx.doi.org/10.15381/anales.v25i1.9703.
Full textUlloa Ramones, Luis Alejandro, and Diego Alberto Ulloa Ramones. "Evaluación de los niveles de cortisol y testosterona durante el proceso de colecta de semen mediante electroeyaculador en carneros con y sin tranquilizante." Ciencia Digital 4, no. 2 (April 4, 2020): 65–76. http://dx.doi.org/10.33262/cienciadigital.v4i2.1206.
Full textPérez Clariget, Raquel, Carlos López Mazz, María Belén López Pérez, and Álvaro López Pérez. "La duración del tratamiento con esponjas intravaginales impregnadas con medroxiprogesterona en la estación reproductiva influye la respuesta a la sincronización de celos en ovejas Corriedale y Merino." Enero-Junio 2021 29, no. 1-2 (March 8, 2021): 29–36. http://dx.doi.org/10.53588/alpa.291204.
Full textWyss, Urs. "Lebensweise und Verhalten von Insekten. Spektakuläre Videoaufnahmen nach Wahl." Beiträge zur Entomologie = Contributions to Entomology 56, no. 2 (December 15, 2006): 479–80. http://dx.doi.org/10.21248/contrib.entomol.56.2.479-480.
Full textDissertations / Theses on the topic "Semen de Carnero"
Cabello, Araya Constanza Francisca. "Efectos de la administración de vitaminas antioxidantes en las características seminales y estado oxidativo del carnero." Tesis, Universidad de Chile, 2015. http://repositorio.uchile.cl/handle/2250/143061.
Full textEl estrés oxidativo se describe como una de las principales causas la alteración de la calidad seminal del carnero, afectando a la concentración, motilidad, vitalidad y morfología espermática. Estudios muestran que la terapia antioxidante es capaz de mejorar la capacidad antioxidante, atenuar los daños por estrés oxidativo y mejorar la calidad seminal. En éste estudio se evaluó el efecto de la suplementación oral de vitaminas antioxidantes sobre las características seminales y en el estado oxidativo del carnero. Para esto se administraron 650 mg de vitamina C y 450 UI de vitamina E durante 60 días a la mitad de los animales (n=5) y la otra mitad se usó como grupo control (n=5). Se tomaron muestras de semen y sangre a los 0, 30 y 60 días, mediante electroeyaculación y venipunción, respectivamente. La evaluación de las características seminales de concentración, vitalidad espermática y motilidad progresiva se realizó con el sistema CASA. El volumen del eyaculado se evaluó con la copa de extracción y el pH mediante tiras reactivas. La evaluación del estado antioxidante se realizó mediante la medición del la capacidad antioxidante total (TAC) y la concentración de malondialdehido (MDA) en el plasma sanguíneo, mediante la técnica de ELISA. Las concentraciones plasmáticas de vitamina C y E se evaluaron mediante HPLC. Se encontró que la administración oral de vitaminas C y E aumenta significativamente las concentraciones plasmáticas de las vitaminas, tras 30 y 60 días de administración (p<0,05). Asimismo, la suplementación de vitaminas antioxidantes aumentó significativamente la concentración espermática a los 30 días de tratamiento, además de aumentar la vitalidad y concentración espermática tras 60 días de tratamiento (p<0,05). Se concluye que la suplementación oral con vitaminas E y C a partir de 30 días mejora la calidad seminal en carneros.
Oxidative stress is described as a major cause of impaired ram semen quality, affecting concentration, motility, vitality and sperm morphology. Studies show that antioxidant therapy is able to improve antioxidant status, mitigating the oxidative damage, and improving semen quality. In this study, the effect of oral antioxidant vitamins supplementation on the seminal characteristics and oxidative status were evaluated in rams. Half the animals (n = 5) were suplemented with 650 mg of vitamin C and 450 IU of vitamin E for 60 days, and the other half was the control group (n = 5). Semen and blood samples were taken at 0, 30 and 60 days of treatment by electroejaculation and venipuncture, respectively. Evaluation of seminal characteristics of like sperm concentration, sperm vitality and motility were performed by means CASA system. Volume of the ejaculate was assessed directly in the extraction cup and pH using test strips. Antioxidant status was assessed by analyzing total antioxidant capacity (TAC) and malondialdehyde (MDA) in blood plasma by ELISA. Plasma vitamins concentrations were evaluated with HPLC. It was found that oral administration of vitamin C and E significantly increased vitamins plasma concentrations at 30 and 60 days of supplementation (p <0.05). In addition, vitamins supplementation significantly increased sperm concentration by 30 days of treatment, and increase vitality and sperm concentration at 60 days of treatment (p <0.05). It is concluded that 30 days of oral vitamins C and E supplementation or more, improves semen quality in rams.
Proyecto FONDECYT 1130181
Delgado, Cáceres Belma Exrlalia. "Evaluación espermática de semen de ovino tratado por la técnica de gradiente de densidad." Bachelor's thesis, Universidad Ricardo Palma, 2013. http://cybertesis.urp.edu.pe/handle/urp/589.
Full textHuanca, López Wilfredo. "Características clínicas, seminales y endocrinas en carneros sometidos al aislamiento escrotal." Master's thesis, Universidad Nacional Mayor de San Marcos, 2014. https://hdl.handle.net/20.500.12672/3816.
Full textTesis
Ceppi, Matus Ignacio Andrés. "Efecto de la suplementación con vitaminas C y E sobre características microscópicas de testículo y epidídimo en carneros." Tesis, Universidad de Chile, 2015. http://repositorio.uchile.cl/handle/2250/143060.
Full textIntroducción: Uno de los factores que influye en la capacidad reproductiva y que posee un impacto a nivel testicular, es el desbalance entre las especies reactivas del oxígeno (ROS) y los mecanismos antioxidantes. Se ha visto que la suplementación con antioxidantes no-enzimáticos (vitaminas C y E) permite mejorar el estatus antioxidante endógeno de los machos, previniendo la peroxidación lipídica, el daño celular y otros eventos de daño oxidativo a nivel reproductivo que tienen relación con pérdidas causadas por subfertilidad o infertilidad en sistemas productivos ovinos. Objetivos y métodos: El objetivo del presente estudio fue evaluar el efecto de vitaminas antioxidantes (C y E) sobre la estructura microscópica de testículo y epidídimo en carneros. Este estudio se realizó en las dependencias de la Facultad de Ciencias Veterinarias y Pecuarias de la Universidad de Chile. Se utilizaron 20 carneros híbridos de 1 año de edad aproximadamente, los cuales se distribuyeron en dos grupos; un grupo con tratamiento (LLV, n=10) y un grupo control sin tratamiento (LL, n=10). Se suplementó diariamente durante 60 días con vitaminas antioxidantes (600 mg. de vitamina C y 450 U.I. de vitamina E, vía oral). Se tomaron muestras de tejido provenientes de testículo y epidídimo a los 30 y 60 días posterior al inicio de la suplementación vitamínica. En cada tiempo muestral los grupos de muestreo estuvieron formados por 5 animales de cada grupo. Se obtuvieron cortes de 6 μm de grosor, los que fueron procesados mediante procedimientos histológicos estándares de rutina y teñidos con Hematoxilina-Eosina. El estudio histológico se llevó a cabo mediante la obtención y observación de imágenes microscópicas tomadas con un aumento de 100x y 400x para su posterior análisis.f Resultados y conclusiones: Los resultados muestran que la suplementación con vitaminas C y E promueve la proliferación de células de Leydig y de Sertoli en el testículo de carneros suplementados. Por otra parte, la suplementación antioxidante no posee efectos a nivel histológico en el epidídimo. En conclusión, estos efectos a nivel testicular influyen de manera directa sobre un mayor desarrollo de células espermatogénicas en el epitelio germinativo y, en consecuencia, en una mayor capacidad reproductiva y fertilidad potencial de carneros suplementados.
Background: One of the main factors that influences the reproductive capacity and that has an impact at a testicular level, is the imbalance between the reactive oxygen species (ROS) and the antioxidant mechanisms. It has been shown that a supplementation with non-enzymatic antioxidants (vitamins C and E) improves the endogenous antioxidant status, preventing lipid peroxidation, cellular damage and other events of oxidative damage at a reproductive level, which are related with losses caused by subfertility or infertility in sheep production systems. Aims and methods: The aim of this study was to evaluate the effect of antioxidant vitamins (C and E) upon the microscopic structure of testis and epididymis in rams. This study was carried out at the Faculty of Veterinary and Animal Sciences of the University of Chile. Twenty hybrid rams of 1 year old were used, which were divided into two groups; one treated group (LLV, n=10) and an untreated control group (LL, n=10). The rams of the LLV group were supplemented daily during 60 days with the antioxidant vitamins (600 mg. of vitamin C and 450 IU of vitamin E, orally). Tissue samples from testis and epididymis were taken at 30 and 60 days after beginning the vitamin supplementation. At each sampling time, the sample groups were composed of 5 animals per group. Cuts of 6 microns thick were obtained, which were processed using routine histological methods and stained with hematoxylin-eosin. Histological study was carried out by obtaining and the observation of microscopic images taken with a 40x and 10x magnification for later analysis. Results and conclusions: The results shown that supplementation with antioxidant vitamins (C and E) promotes the proliferation of Leydig and Sertoli cells in the testis of supplemented rams. Moreover, antioxidant supplementation has no effects on a microscopic level in the epididymis. In conclusion, these effects at a testicular level have a direct influence on the further development of spermatogonial cells in the germinal epithelium and, consequently, in a greater reproductive capacity and potential fertility in supplemented rams.
Proyecto Fondecyt 1130181
Siqueira, Filho Edson Ramos de [UNESP]. "Influência dos níveis protéicos fornecidos na dieta sobre o sistema reprodutivo de carneiros." Universidade Estadual Paulista (UNESP), 2007. http://hdl.handle.net/11449/98228.
Full textFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
A nutrição é um dos principais fatores que afetam diretamente o metabolismo produtivo e reprodutivo dos animais. Dentre os fatores nutricionais a proteína é um dos elementos mais importantes. Este estudo objetivou a análise de possíveis alterações no sistema reprodutivo de carneiros mediadas pela diferença de proteínas fornecidas na dieta total. Foram instituídas quatro dietas com distintos níveis protéicos: A- (controle) 13,4% PB; 210 g/dia PM; B- 11,4% PB e 187 g/dia PM; C- 17,5% PB e 231 g /dia PM; D-22,4% PB e 215,0 g/dia PM. As coletas de dados foram realizadas em D0; D20; D40; D80; D120. Durante o experimento os animais foram pesados e avaliados quanto a condição corporal; foi feita coleta de sêmen e avaliação em sistema computadorizado (CASA), ultrassonografia e citologia testicular; e dosagem de testosterona, T3 e T4. Os dados obtidos neste estudo, mostraram que a dieta A, não provocou alterações no sistema reprodutivo, portanto foi considerada a mais indicada a carneiros em atividade reprodutiva.
Nutrition is one of the main factors that directly affect the productive and reproductive metabolism of animals. Among nutritional factors, protein is one of the most important elements. The objective of this study was to analyze the possible alterations in the reproductive system of rams mediated by the difference of proteins provided in the total diet. Four diets were established, with distinct protein levels: A- (control) 13,4% CP (Crude Protein); 210 g/day MP (Metabolized Protein); B- 11,4% CP and 187 g/day MP; C- 17,5% CP and 231 g /day MP; D-22,4% CP and 215,0 g/day MP. Data collections were performed in D0; D20; D40; D80; D120. During the experiment, animals were weighted and evaluated concerning body condition; semen collection and evaluation were carried out in computer system (CASA); ultrasound examination and testicular cytology; and hormonal count of testosterone, T3 e T4. The results obtained in this study showed that diet is A did not cause changes in the reproductive system of rams. Therefore, it was considered the most appropriate for rams in reproductive activity.
Arancibia, Cádiz Massiel Alejandra. "Efecto de la suplementación oral con vitaminas C y E sobre la calidad del semen de carnerillos conservado a temperatura ambiente y refrigeración." Tesis, Universidad de Chile, 2016. http://repositorio.uchile.cl/handle/2250/151059.
Full textLa calidad del semen está definida por los parámetros de volumen del eyaculado, concentración espermática, movilidad masal, vitalidad espermática, motilidad espermática, velocidad espermática y color del eyaculado (Cabrera et al., 2011). Para que el semen se considere de alta calidad, debe encontrarse dentro de rangos descritos para su especie.
Siqueira, Filho Edson Ramos de. "Influência dos níveis protéicos fornecidos na dieta sobre o sistema reprodutivo de carneiros /." Botucatu : [s.n.], 2007. http://hdl.handle.net/11449/98228.
Full textBanca: Lia de Alencar Coelho
Banca: Sony Dimas Bicudo
Resumo: A nutrição é um dos principais fatores que afetam diretamente o metabolismo produtivo e reprodutivo dos animais. Dentre os fatores nutricionais a proteína é um dos elementos mais importantes. Este estudo objetivou a análise de possíveis alterações no sistema reprodutivo de carneiros mediadas pela diferença de proteínas fornecidas na dieta total. Foram instituídas quatro dietas com distintos níveis protéicos: A- (controle) 13,4% PB; 210 g/dia PM; B- 11,4% PB e 187 g/dia PM; C- 17,5% PB e 231 g /dia PM; D-22,4% PB e 215,0 g/dia PM. As coletas de dados foram realizadas em D0; D20; D40; D80; D120. Durante o experimento os animais foram pesados e avaliados quanto a condição corporal; foi feita coleta de sêmen e avaliação em sistema computadorizado (CASA), ultrassonografia e citologia testicular; e dosagem de testosterona, T3 e T4. Os dados obtidos neste estudo, mostraram que a dieta A, não provocou alterações no sistema reprodutivo, portanto foi considerada a mais indicada a carneiros em atividade reprodutiva.
Abstract: Nutrition is one of the main factors that directly affect the productive and reproductive metabolism of animals. Among nutritional factors, protein is one of the most important elements. The objective of this study was to analyze the possible alterations in the reproductive system of rams mediated by the difference of proteins provided in the total diet. Four diets were established, with distinct protein levels: A- (control) 13,4% CP (Crude Protein); 210 g/day MP (Metabolized Protein); B- 11,4% CP and 187 g/day MP; C- 17,5% CP and 231 g /day MP; D-22,4% CP and 215,0 g/day MP. Data collections were performed in D0; D20; D40; D80; D120. During the experiment, animals were weighted and evaluated concerning body condition; semen collection and evaluation were carried out in computer system (CASA); ultrasound examination and testicular cytology; and hormonal count of testosterone, T3 e T4. The results obtained in this study showed that diet is A did not cause changes in the reproductive system of rams. Therefore, it was considered the most appropriate for rams in reproductive activity.
Mestre
Fuentes, Molina Oscar Esteban. "Efectos de la administración de vitaminas antioxidantes en la gametogénesis y el estatus redox del semen en carneros expuestos a la altura." Tesis, Universidad de Chile, 2019. http://repositorio.uchile.cl/handle/2250/170709.
Full textIntroduction: The sheep production is the main resource of families living at high altitude. However, has a poor reproductive efficiency in relation to that recorded at sea level. Hypobaric hypoxia at high altitude environments produces oxidative stress, which leads to detrimental effects on the reproductive system. Low fertility rates, low intrauterine development and low birth weights are some of the damaging effects of exposure to high altitude. Therapy with antioxidant in ewes maintained at high altitude has been shown to reduce oxidative damage caused by hypoxia and increase reproductive capacity. For these reasons, supplementation with antioxidant vitamins C and E was evaluated in its capacity to attenuate the oxidative deleterious effects on reproductive function in rams exposed to high altitude for short or long periods. Materials and Methods: Three groups of rams were evaluated, rams born and kept at sea level (BB, n = 20); rams born at sea level and exposed to high altitude (BA; n = 50); born and kept at high altitude (AA; n = 50). Half of the animals in each group were daily supplemented with 600 mg of vitamin C and 450 IU of vitamin E, orally, for 240 days. The cell populations present in the seminiferous epithelium, the sperm morphology in the ejaculate and the antioxidant status of seminal plasma were analyzed. Results: Oral supplementation with vitamins C and E prevented and / or softened the reduction of the spermatogonial population, the reduction of the height of the seminiferous epithelium and the tubular diameter, the decrease of the total antioxidant capacity and reduced the degree of spermatogenic arrest at day 30 in rams not adapted to high altitude However, it did not have effects on sperm morphology and enzymes present in the seminal plasma of rams exposed at high altitude for a short and long periods. Conclusion: Supplementation with antioxidant vitamins favors the spermatogenesis and the total antioxidant capacity of the seminal plasma of rams not adapted to high altitude in the short term.
Introduction: The sheep production is the main resource of families living at high altitude. However, has a poor reproductive efficiency in relation to that recorded at sea level. Hypobaric hypoxia at high altitude environments produces oxidative stress, which leads to detrimental effects on the reproductive system. Low fertility rates, low intrauterine development and low birth weights are some of the damaging effects of exposure to high altitude. Therapy with antioxidant in ewes maintained at high altitude has been shown to reduce oxidative damage caused by hypoxia and increase reproductive capacity. For these reasons, supplementation with antioxidant vitamins C and E was evaluated in its capacity to attenuate the oxidative deleterious effects on reproductive function in rams exposed to high altitude for short or long periods. Materials and Methods: Three groups of rams were evaluated, rams born and kept at sea level (BB, n = 20); rams born at sea level and exposed to high altitude (BA; n = 50); born and kept at high altitude (AA; n = 50). Half of the animals in each group were daily supplemented with 600 mg of vitamin C and 450 IU of vitamin E, orally, for 240 days. The cell populations present in the seminiferous epithelium, the sperm morphology in the ejaculate and the antioxidant status of seminal plasma were analyzed. Results: Oral supplementation with vitamins C and E prevented and / or softened the reduction of the spermatogonial population, the reduction of the height of the seminiferous epithelium and the tubular diameter, the decrease of the total antioxidant capacity and reduced the degree of spermatogenic arrest at day 30 in rams not adapted to high altitude However, it did not have effects on sperm morphology and enzymes present in the seminal plasma of rams exposed at high altitude for a short and long periods. Conclusion: Supplementation with antioxidant vitamins favors the spermatogenesis and the total antioxidant capacity of the seminal plasma of rams not adapted to high altitude in the short term.
Financiamiento: Proyecto Fondecyt 1130181
Moreira, Emerson Pinto. "Efeitos de dieta contendo castanha de caju sobre o desenvolvimento ponderal, parÃmetros seminais e proteoma do plasma seminal de carneiros Morada Nova." Universidade Federal do CearÃ, 2015. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=14976.
Full textO presente estudo avaliou os efeitos da inclusÃo de 13% de farelo de castanha de caju (CNM) na dieta de carneiros Morada Nova nos parÃmetros seminais e proteÃnas do plasma seminal. Vinte carneiros foram distribuÃdos em dois grupos iguais: grupo castanha de caju (CNG) e grupo controle (COG). O CNG e COG receberam 13% e 0% de CNM na dieta durante 90 dias. Os grupos foram comparados para peso corporal, circunferÃncia escrotal, parÃmetros seminais e proteÃnas do plasma seminal, utilizando o MÃtodo de Shotgun Proteomics. Peso corporal e circunferÃncia escrotal aumentaram durante os 90 dias do perÃodo experimental em ambos grupos, porÃm nÃo existiu diferenÃa significativa entre CNG e COG. Contudo, apÃs 60 dias, o consumo de matÃria seca foi inferior no CNG (2,9 Â 0,1; aos 90 dias) em relaÃÃo ao COG (3,4 Â 0,1; aos 90 dias). Os parÃmetros seminais nÃo diferiram entre CNG e COG. A anÃlise shotgun proteomics identificou isoaspartil peptidase L asparaginase, gliceraldeÃdo 3 fosfato desidrogenase e prostaglandina H2 D isomerase com alta expressÃo no CNG quando comparado COG. Ao mesmo tempo, 12 proteÃnas do plasma seminal apresentaram baixa expressÃo no CNG, identificadas como beta galactosidase, caltrina, beta mannosidase, glutationa peroxidase, sorbitol desidrogenase, clusterina, albumina and serotransferrina. AlÃm disso, 20 proteÃnas detectadas no plasma seminal do COG foram ausentes no CNG e cinco proteÃnas foram presentes somente nos carneiros que receberam dieta hiperlipÃdica. Em conclusÃo, o presente estudo descreveu, pela primeira vez, os efeitos de uma dieta hiperlipÃdica nos parÃmetros do sÃmen fresco e do plasma seminal de carneiros. Enquanto os critÃrios seminais nÃo foram afetados, proteÃnas especÃficas do fluido seminal foram alteradas em decorrÃncia da dieta com castanha de caju. Visto os aspectos multifuncionais dessas proteÃnas, nÃs sugerimos que certos aspectos da fertilidades de carneiros podem ser alteradas se a castanha de caju for fornecida.
The present study was carried out to evaluate the effects of 13% of cashew nut meal (CNM) inclusion in the diet of Morada Nova rams on semen parameters and seminal plasma proteins. Twenty rams were distributed in two equal groups: cashew nut group (CNG) and control group (COG). The CNG and COG received 13% and 0% of CNM in the diet for 90 days. The groups were compared for live weight, scrotal circumference, seminal parameters and seminal plasma proteins, using shotgun proteomics. Body weight and scrotal circumference increased during the 90-day experimental period in both cashew nut-fed and control groups but with no differences between CNG and COG. However, after 60 days until 90 days, percentage of dry matter intake (% live weight) was inferior in CNG (2,9 Â 0,1; at 90 days) group than COG (3,4 Â 0,1; at 90 days). The sperm quality parameters were not different between CNG and COG.The shotgun proteomics analysis identified isoaspartyl peptidase L asparaginase, glyceraldehyde 3 phosphate dehydrogenase and prostaglandin H2 D isomerase with higher expression in the cashew nut group as compared to animals receiving the control diet. Conversely, 12 seminal plasma proteins had lower expression in the cashew nut group, identified as beta galactosidase, caltrin, beta mannosidase, glutathione peroxidase, sorbitol dehydrogenase, clusterin, albumin and serotransferrin. Moreover, 20 proteins detected in the seminal plasma of the control animals were absent in the cashew nut fed animals and five were present only in the rams receiving the high fat diet. In conclusion, the present study describes, for the first time, the effects of a high fat diet on parameters of the fresh semen and seminal plasma proteins of rams. While sperm criteria were not affected, specific seminal fluid proteins did change as the result of cashew nut feeding. Given the multifunctional aspects of such proteins, we suggest that certain aspects of the ram fertility can be altered if cashew nut is provided.
SOUSA, Bartira Pastor de Andrade. "Avaliação in vitro e in vivo da adição de diluentes na refrigeração do sêmen de carneiros da Raça Dorper." Universidade Federal Rural de Pernambuco, 2008. http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/5284.
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The aim of the present study was to assess the in vitro and in vivo viability of sperm cells following the addition of diluent in the refrigeration process of sheep semen and the fertilization of oocytes following the insemination of superovulated ewes. In Experiment I, three ejaculates from each of three Dorper breeders were used, collected with an artificial vagina during three repetitions with three-day intervals. The macroscopic and microscopic characteristics of the semen were analyzed before and after the pooling, analyzing sperm concentration, DNA integrity and acrosome integrity as well. The pooled semen was divided into five equal parts. Dilution was performed (1:3, semen:diluent) to establish the diluent groups: Equimix (DI), Laiciphos Green Ovine (DII), FR 4 (DIII), Equimix-Yolk [Equimix with 20% egg yolk (DIV)] and Tris-Yolk (DV; control). Each group was subdivided in quadruplicate, refrigerated and kept at 4 °C until the evaluations (MIP, vigor, DNA integrity and acrosome integrity), corresponding to 0, 12, 24, 36 and 48 hours. In the in vitro assessments, DI exhibited the greatest drop in MIP at 12 h in comparison to the other groups (p<0.05). At 24 h, DII, DIV and DV exhibited the highest MIP (p<0.05), with no significant differences between one another (p>0.05). At 48 h, DII and DV were superior to the other groups (p<0.05). Regarding vigor, DII and DV had higher values (p<0.05) than DI and DIII at 12 hours and DIV had the highest values at 24 hours (p<0.05). In all groups, there was total preservation of DNA integrity and a high number of spermatozoids with intact acrosomes for all the intervals studied. In Experiment II, the same collection method and processing of the ejaculates from the three Dorper breeders were performed. A pool was formed of the threeejaculates of each animal, divided into two equal parts at a 1:3 proportion in order to establish the experimental groups: Equimix-Yolk (DI) and Tris-Yolk (DII; control). Each group was subdivided into two aliquots: fresh – F (F-DI and F-DII), which was used immediately; and refrigerated – R (R-DI and R-DII), which was kept at 4 °C for a storage time of 24 hours. Laparoscopic inseminations were preformed with an inseminate volume of 0.25 mL per uterine horn, which was when the ovary evaluations were performed. Thirty-nine embryo harvesting procedures were performed, 19 using refrigerated semen and (R-DI and R-DII) and 20 using fresh semen (F-DI and F-DII). In the in vivo test, a general rate of 71.0% (237/334) of fertilized structures was obtained, 59.3% (198/334) of which were viable embryos. There was no significant variation (p>0.05) between the types of semen and diluents. Among the total number of embryos, 86.4% exhibited quality Grades I and II, with the refrigerated semen of R-DI obtaining the best percentage (100%)(p<0.05). The ovarian status at the time of insemination affected fertilization, as better results were obtained for the fresh semen of F-DI when the ovary was ovulating. For F-DII, this status exhibited a smaller number of fertilized structures (p<0.05). At the end of the experiments, it was concluded that both the Laiciphos Green Ovine and Tris-Yolk can be used in the conservation of semen at 4 °C for 48 hours, whereas Equimix added with 20% egg yolk is recommended for use in semen storage (4 °C) of up to 24 hours. The refrigeration of ovine semen at 4 °C for 24 hours is viable for use inembryo transference programs. Equimix added with 20% egg yolk resulted in a fertilization rate and embryo quality similar to the traditional Tris-Yolk.
Neste estudo objetivou-se avaliar a viabilidade in vitro e in vivo das células espermáticas após a adição de diluente no processo de refrigeração do sêmen ovino, e na fertilização de oócitos após inseminação de fêmeas ovinas superovuladas. No Experimento I foram utilizados três ejaculados de cada um dos três reprodutores Dorper, coletados com vagina artificial a intervalo de 3 dias, em três repetições. As características macro e microscópicas do sêmen foram analisadas antes e após a formação de um pool, além da concentração espermática, integridade do DNA e do acrossoma. O pool foi dividido em cinco partes iguais, procedeu-se com a diluição (1:3, sêmen:diluente) para constituir os respectivos grupos de diluentes: Equimix (DI), Laiciphos Green Ovine (DII), FR 4 (DIII), Equimix-Gema – Equimix com 20% gema de ovo (DIV) e Tris-Gema (DV; controle). Cada grupo foi subdividido em quadruplicata, refrigerado e mantido a 4 °C até as avaliações (MIP, vigor, integridade do DNA e do acrossoma) correspondendo a 0, 12, 24, 36 e 48 horas. Nas avaliações in vitro do sêmen o DI apresentou maior queda de MIP às 12 h em relação aos demais grupos (p<0,05). Às 24 h os grupos DII, DIV e DV apresentaram a melhor MIP (p<0,05), não divergindo (p>0,05) entre si, enquanto que às 48 h o DII e o DV foram superiores (p<0.05) aos demais. Com relação ao vigor, os grupos DII e o DV apresentaram valores superiores (p<0,05) ao DI e DIII a partir das 12 horas e ao DIV a partir das 24 horas (p<0,05). Em todos os grupos de diluentes houve a preservação total da integridade do DNA e alto índice de espermatozóides com acrossoma intacto, para todos os intervalos avaliados.Para o Experimento II foi utilizada a mesma técnica para colheita e processamento dos ejaculados de três reprodutores Dorper. Formou-se um pool com três ejaculados de cada animal, dividiu-se em duas partes iguais diluídas na proporção 1:3 para constituir os respectivos grupos experimentais: Equimix-Gema (DI) e Tris-Gema (DII; controle). Cada grupo foi subdividido em outras duas alíquotas: fresco – F (F-DI e F-DII), que foi usado imediatamente, e refrigerado – R (R-DI e R-DII), mantido a 4 °C por 24 horas de armazenamento. Foram realizadas inseminações laparoscópicas, com volume inseminante de 0,25 mL por corno uterino, momento em que foram realizadas as avaliações dos ovários. Foram realizados 39 procedimentos de colheitas de embriões, em 19 foram utilizados sêmen refrigerado (R-DI e R-DII) e em 20 sêmen fresco (F-DI e F-DII). No teste in vivo obteve-se uma taxa geral de estruturas fertilizadas de 71,0% (237/334), sendo 59,3% (198/334) de embriões viáveis, o que não variou significativamente (p>0,05) entre os tipos de sêmen e de diluentes. No total dos embriões, 86,4% apresentaram qualidade de grau I e II, sendo o sêmen refrigerado do R-DI o de melhor percentual (100%) (p<0,05). O “status” ovariano no momento da inseminação interferiu na fertilização, observado-se melhores resultados para o sêmen fresco do F-DI quando o ovário se encontrava em ovulação. Para o F-DII, este status foi o que apresentou menor quantidade de estruturas fertilizadas (p<0,05). Ao final dos experimentos pode-se concluir que: o diluente Laiciphos Green Ovine, da mesma forma que o Tris-gema, pode ser utilizado na conservação do sêmen a 4 °C por 48 horas; enquanto o Equimix, acrescido de 20% de gema de ovo, recomenda-se que seja utilizado no armazenamento do sêmen (4 °C) por até 24 horas. É viável a refrigeração do sêmen ovino a 4°C por 24 horas para a utilização em programas de transferência de embriões; e que o diluidor Equimix, acrescido de 20% gema de ovo, resultou em taxa de fertilização e qualidade embrionária similares ao tradicional Tris-Gema.
Book chapters on the topic "Semen de Carnero"
Traill, Thomas A. "Tumours of the heart." In Oxford Textbook of Medicine, edited by Jeremy Dwight, 3544–50. Oxford University Press, 2020. http://dx.doi.org/10.1093/med/9780198746690.003.0361.
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