RESUMO

The objective of this study was to evaluate the effect of environment on follicular diameter and repeatability of the size of preovulatory follicles of mares. Temperature, rainfall, and photoperiod were measured, and their effects were evaluated on follicular dynamics. Data were studied by analysis of variance of follicular size and environment traits. During the five years, 7% double ovulations and 159 anovulatory follicles were recorded. Mean preovulatory follicle diameters of left and right ovaries were 39.3±3.8 and 39.2±3.5 mm respectively. There was no effect of evaluation year on follicular diameter. Reproduction season affected the right preovulatory follicle diameter. There was no effect of temperature and rainfall on follicular diameter. Repeatability values of the preovulatory follicular diameter were low. In the subtropical climate studied, temperature and rainfall caused no effect on follicular dynamics, and photoperiod had only a small effect on dominant preovulatory follicular diameter. Repeatability of follicular diameter was low, so this characteristic should be evaluated daily to predict ovulation and the optimal time to inseminate mares.(AU)

Assuntos

RESUMO

Evaluation of the testis size is very important in stallions’ selection, since it is an indirect determinant of their reproductive potential. The aim of this study was to evaluate the biometric testicular traits, calculate the volume testicular and analyze the serum testosterone concentration of the stallion. During six months were measured the tests of adults Brazilian Ponies stallions from northern of Rio de Janeiro State, Brazil. The length, the width and the height of the testicles (TL, TW and TH) were measured. From these measurements, the total testicular volume (TTV) was calculated. The serum testosterone concentration was also evaluated. The data were studied by analysis of variance and were calculated the correlations among the traits. The average of the testis biometry were TL 5.8 ± 0.6 cm; TW 3.8 ± 0.5 cm; TH 4.7 ± 0.4 cm and 111.2 ± 27.7 for TTV. Mean of serum testosterone concentration was 0.89 ± 0.52 ng/dl. High correlations between biometry testicular traits with testicular volume were observed and low to moderate correlations were observed for testicular traits, testosterone and sperm output. The testis size could be an important trait that assists to the prediction of stallion's reproductive potential of the Brazilian ponies stallions. It is suggested that there would be no fluctuation in serum testosterone concentration in Brazilian ponies stallions that coult afect on its fertility.

Avaliação do tamanho dos testículos é muito importante na seleção de garanhões, uma vez que é um determinante indireto do seu potencial reprodutivo. O objetivo deste estudo foi avaliar as características de biometria testiculares, calcular o volume testicular e analisar a concentração sérica de testosterona de garanhões. Durante seis meses, foram medidos os testículos de garanhões Pôneis da raça Brasileiro adultos, criados no Norte do Estado do Rio de Janeiro, Brasil. O comprimento a largura e a altura dos testículo (TL, TW e TH) foram mensurados. A partir dessas medidas, calculou-se o volume testicular total (TTV). Os dados foram avaliados por análise de variância e foram calculadas as correlações entre as características. A média geral das características de biometria testicular e volume testicular foram: TL 5,8 ± 0,6 cm; TW 3,8 ± 0,5 cm; TH 4,7 ± 0,4 cm e TTV 111.2 ± 27,7. A média de concentração sérica de testosterona foi de 0,89 ± 0,52 ng/dl. Altas correlações foram observadas entre as características de biometria testicular e volume testicular. Baixas a médias correlações entre as características testiculares com produção espermática e com concentração de testosterona foram observadas. O tamanho testicular pode ser uma importante característica que auxilia na predição do potencial reprodutivo do garanhão pôneis da raça Brasileira. Sugere-se que não há variações na concentração sérica de testosterona nos pôneis da raça Brasileira que poderia afetar em sua fertilidade.

Assuntos

RESUMO

Evaluation of the testis size is very important in stallions selection, since it is an indirect determinant of their reproductive potential. The aim of this study was to evaluate the biometric testicular traits, calculate the volume testicular and analyze the serum testosterone concentration of the stallion. During six months were measured the tests of adults Brazilian Ponies stallions from northern of Rio de Janeiro State, Brazil. The length, the width and the height of the testicles (TL, TW and TH) were measured. From these measurements, the total testicular volume (TTV) was calculated. The serum testosterone concentration was also evaluated. The data were studied by analysis of variance and were calculated the correlations among the traits. The average of the testis biometry were TL 5.8 ± 0.6 cm; TW 3.8 ± 0.5 cm; TH 4.7 ± 0.4 cm and 111.2 ± 27.7 for TTV. Mean of serum testosterone concentration was 0.89 ± 0.52 ng/dl. High correlations between biometry testicular traits with testicular volume were observed and low to moderate correlations were observed for testicular traits, testosterone and sperm output. The testis size could be an important trait that assists to the prediction of stallion's reproductive potential of the Brazilian ponies stallions. It is suggested that there would be no fluctuation in serum testosterone concentration in Brazilian ponies stallions that coult afect on its fertility.(AU)

Avaliação do tamanho dos testículos é muito importante na seleção de garanhões, uma vez que é um determinante indireto do seu potencial reprodutivo. O objetivo deste estudo foi avaliar as características de biometria testiculares, calcular o volume testicular e analisar a concentração sérica de testosterona de garanhões. Durante seis meses, foram medidos os testículos de garanhões Pôneis da raça Brasileiro adultos, criados no Norte do Estado do Rio de Janeiro, Brasil. O comprimento a largura e a altura dos testículo (TL, TW e TH) foram mensurados. A partir dessas medidas, calculou-se o volume testicular total (TTV). Os dados foram avaliados por análise de variância e foram calculadas as correlações entre as características. A média geral das características de biometria testicular e volume testicular foram: TL 5,8 ± 0,6 cm; TW 3,8 ± 0,5 cm; TH 4,7 ± 0,4 cm e TTV 111.2 ± 27,7. A média de concentração sérica de testosterona foi de 0,89 ± 0,52 ng/dl. Altas correlações foram observadas entre as características de biometria testicular e volume testicular. Baixas a médias correlações entre as características testiculares com produção espermática e com concentração de testosterona foram observadas. O tamanho testicular pode ser uma importante característica que auxilia na predição do potencial reprodutivo do garanhão pôneis da raça Brasileira. Sugere-se que não há variações na concentração sérica de testosterona nos pôneis da raça Brasileira que poderia afetar em sua fertilidade.(AU)

Assuntos

RESUMO

The aim of this study was to evaluate the breeding behavior of Brazilian Pony stallions during semen collection to examine the effect of age category (AC) and month of evaluation on the characteristics of breeding behavior. Nine stallions were evaluated during the breeding and non-breeding season, 5-8 (AC1) and 9-13 years (AC2) of age. The variables evaluated were reaction time (RT), mount time one (MT1) and two (MT2), mount and ejaculation time (MEjT), mounting without erection (MWEr), mounting without ejaculation (MWEj), flehmen, kicks, bites, smells, vocalizations and serum testosterone concentration. Analyses of variance and correlation were performed. The average scores were RT: 56.2±92.9s, MT1: 115.0±122.4s, MT2: 196.4±160.7s, MEjT: 21.8±3.2s, MWEr: 0.8±1.3s, MWEj: 2.1±3.5s, flehmen: 3.8±3.0s, kicks: 0.3±1.2s, bites: 1.0±2.0s, smells: 5.7±3.5s, vocalizations: 6.4±6.3s and testosterone: 0.89±0.52ng/mL. The AC affected the RT (P<0.05) but not the other traits. Month of evaluation did not affect most variables (P>0.05). The correlations between age and RT and between age and MT1 and MT2 were significant. The correlation between testosterone and MEjT was moderate and negative. The breeding behavior of Brazilian Pony stallions was similar across different months of evaluation and different age categories. The month of evaluation and age category also did not affect testosterone concentrations, meaning that semen collection is feasible throughout the year.

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RESUMO

A torção do útero em equinos apesar de pouco frequente, predispõe a sérias complicações. Sinais de dor abdominal são comuns e podem ser confundidos com obstrução do trato gastrointestinal e devido ao risco de óbito para a mãe e o feto é fundamental o atendimento imediato. O presente trabalho relata o caso de uma égua encaminhada ao Hospital Veterinário da UENF com sinais de dor abdominal intensa. Após palpação retal,ultrassonografia e vaginoscopia, suspeitou-se de torção de uterina. Decidiu-se pela cirurgia cesariana. No procedimento cirúrgico confirmou-se a torção uterina, retirando-se o feto e corrigindo a torção. Após o reposicionamento do útero, a cavidade abdominal foi explorada e nenhuma alteração gastrointestinal concomitante foi encontrada. A égua apresentou plena recuperação no pós-operatório, entretanto o feto veio a óbito três dias após a cirurgia.

The uterine torsion in horses, although uncommon, predisposes to serious complications. Signs ofabdominal pain are common and can be confused with obstruction of the gastrointestinal tract. Due to the risk ofdeath for the mother and the fetus, immediate veterinary care is fundamental. This paper reports the case of amare sent to the Veterinary Hospital of UENF with signs of severe abdominal pain. After rectal palpation, ultrasoundand vaginoscopy examination, it was suspected uterine torsion. It was decided by cesarean section. During thesurgical procedure, uterine torsion was confirmed, the fetus removed and the torsion corrected. After repositioningof the uterus, the abdominal cavity was exploited and no concurrent gastrointestinal disorder was found. Themare had full recovery after surgery, however, the foal came to death three days after the surgery.

La torsión en los caballos aunque rara, predispone a complicaciones graves. Las seáales de dolorabdominal son comunes y pueden ser confundidas con obstrucción dei tracto gastrointestinal. Debido ai riesgode muerte para Ia madre y para el feto, una atención inmediata es necesária. Em este trabajo se comunica el caso de una yegua enviada ai Hospital Veterinario de Ia UENF con senales de dolor abdominal severo. Después dehacer Ia palpación rectal, Ia ecografía y Ia vaginoscopia se sospechó de presencia de torsión uterina. Se decidió hacer cesárea. EI procedimiento quirúrgico confirmó que habia torsión uterina, el feto se extrajo y Ia torsiónuterina fue corrigida. Después de reposicionamiento dei útero, Ia cavidad abdominal fue revisada y no se encontró ningún problema gastrointestinal asociado. La yegua presentó recuperación completa después de Ia cirugiato davia el feto murió tres dias después de Ia cirugia.

Assuntos

RESUMO

A torção do útero em equinos apesar de pouco frequente, predispõe a sérias complicações. Sinais de dor abdominal são comuns e podem ser confundidos com obstrução do trato gastrointestinal e devido ao risco de óbito para a mãe e o feto é fundamental o atendimento imediato. O presente trabalho relata o caso de uma égua encaminhada ao Hospital Veterinário da UENF com sinais de dor abdominal intensa. Após palpação retal,ultrassonografia e vaginoscopia, suspeitou-se de torção de uterina. Decidiu-se pela cirurgia cesariana. No procedimento cirúrgico confirmou-se a torção uterina, retirando-se o feto e corrigindo a torção. Após o reposicionamento do útero, a cavidade abdominal foi explorada e nenhuma alteração gastrointestinal concomitante foi encontrada. A égua apresentou plena recuperação no pós-operatório, entretanto o feto veio a óbito três dias após a cirurgia.(AU)

The uterine torsion in horses, although uncommon, predisposes to serious complications. Signs ofabdominal pain are common and can be confused with obstruction of the gastrointestinal tract. Due to the risk ofdeath for the mother and the fetus, immediate veterinary care is fundamental. This paper reports the case of amare sent to the Veterinary Hospital of UENF with signs of severe abdominal pain. After rectal palpation, ultrasoundand vaginoscopy examination, it was suspected uterine torsion. It was decided by cesarean section. During thesurgical procedure, uterine torsion was confirmed, the fetus removed and the torsion corrected. After repositioningof the uterus, the abdominal cavity was exploited and no concurrent gastrointestinal disorder was found. Themare had full recovery after surgery, however, the foal came to death three days after the surgery.(AU)

La torsión en los caballos aunque rara, predispone a complicaciones graves. Las seáales de dolorabdominal son comunes y pueden ser confundidas con obstrucción dei tracto gastrointestinal. Debido ai riesgode muerte para Ia madre y para el feto, una atención inmediata es necesária. Em este trabajo se comunica el caso de una yegua enviada ai Hospital Veterinario de Ia UENF con senales de dolor abdominal severo. Después dehacer Ia palpación rectal, Ia ecografía y Ia vaginoscopia se sospechó de presencia de torsión uterina. Se decidió hacer cesárea. EI procedimiento quirúrgico confirmó que habia torsión uterina, el feto se extrajo y Ia torsiónuterina fue corrigida. Después de reposicionamiento dei útero, Ia cavidad abdominal fue revisada y no se encontró ningún problema gastrointestinal asociado. La yegua presentó recuperación completa después de Ia cirugiato davia el feto murió tres dias después de Ia cirugia.(AU)

Assuntos