Academic literature on the topic 'Tabapuã (Zebu)'

O objetivo deste trabalho foi averiguar possíveis variações nas mensurações morfológicas entre reprodutrizes zebus dos grupos genéticos (GG) Indubrasil, Nelore e Tabapuã e entre os GG de suas filhas F1 Holandês x Indubrasil (HxI), Holandês x Nelore (HxN) e Holandês x Tabapuã (HxT), além de estimar coeficientes de herdabilidade (h²) para estas características. O método dos quadrados mínimos foi usado para verificação das diferenças nas características morfológicas entre os GG e para obtenção de estimativas de h² pela regressão filha-mãe (RFM). O método REML foi também usado para estimar h². Os dados foram coletados em 183 vacas zebus e 273 novilhas F1 Holandês x Zebu. O GG das fêmeas F1 foi importante para sua inscrição no livro de controle e registro genealógico da raça Girolando, pois os GG obtiveram diferentes pontuações nas características de classificação total para tipo, aparência geral e caracterização leiteira. Para estas três características, as mestiças HxI obtiveram melhor pontuação que as HxN e as novilhas HxT, pontuação intermediária. Entre as características morfológicas, as larguras entre as tuberosidades ilíacas e as isquiáticas, o comprimento da garupa, a profundidade torácica, a altura na cernelha e o peso corporal não apresentaram diferenças entre os três GG zebus e entre suas progênies F1 Holandês x Zebu. As estimativas de herdabilidade variaram de 0,09 (profundidade torácica) a 0,59 (comprimento da orelha) pela RFM e de 0,09 a 0,89 (mesmas características) pelo método REML. Os resultados indicam que, em sistema de cruzamento com a raça Holandesa, para a produção de novilhas F1 para venda, o GG Indubrasil produziu animais melhor caracterizados, como da raça Girolando, os quais, possivelmente, teriam maior apelo comercial que os dos GG Tabapuã e Nelore. Adicionalmente, as estimativas de herdabilidade indicaram que a seleção para características morfológicas levaria a ganhos genéticos diretos razoáveis.

The goal of this study was to evaluate the rejection rates of Zebu bulls during behavioral assessment (libido and serving ability) and the importance of this step in bull breeding soundness evaluation (BBSE). A total of 1,534 bulls reared in the state of Rio Grande do Sul, Brazil, of Nelore (1,340), Brahman (76), Guzerá (98), and Tabapuã (210) breeds were evaluated. The evaluation consisted of four steps. Step I was the general physical examination, Step II genital tract examination, Step III semen evaluation, and Step IV behavioral assessment of libido and the ability to complete copulation. To evaluate the relationship between the binary variables of approved or rejected during different steps of the BBSE, and age groups (young and mature bulls), chi-square tests and logistic regression were used. The general rejection rates in the BBSE were 5.64% and 15.20% for young and mature Zebu bulls, respectively. Problems with the sexual behavior (libido and/or serving ability) of bulls accounted for the rejection of 0.46% and 2.29% of young and mature Zebu bulls, respectively. The lack of libido and serving ability was shown to be an important problem concerning the total number of possible causes of Zebu bull rejection during the BBSE. This result suggests that the behavioral step should be performed regularly, rather than being complementary to the standard BBSE in Zebu cattle.

The intense selection of characteristics related to animal production may affect negatively the reproductive efficiency of beef cattle. Thus, the search for characteristics that indicate fertility is readily justifiable in the selection of bovine females. The aim was to evaluate possible associations between the antral follicle counts (AFC), external genitalia measurements, and reproduction efficiency in Tabapuã (a Zebu breed from Brazil) females. The AFC was evaluated in Nulliparous heifers (n = 162) and cows (n = 429) by directly counting all follicles ≥3 mm in diameter with ultrasound. From the frequency distribution of the AFC, animals were divided into groups of high (>50 follicles), average (28–50 follicles), and low (<28 follicles), according to Burns et al. (2005). The vulva width was determined by measuring the distance between the lateral borders of the vulva with a digital caliper placed at a 90-degree angle from the half point of the rima vulvae. Two official reproductive efficiency indexes, adopted by the Brazilian Zebu Breeders Association (ABCZ), were used: age at first calving and calving interval. All statistical analyses were performed using SAS (SAS Institute Inc., Cary, NC, USA). An initial complete model was submitted to logistic regression and all body measurements, such as weight, rump height, and width at pins and hooks, were later excluded because they had no relationships with AFC. The AFC class and parity effects of vulva width were submitted to the PROCGENMOD procedure and the reproductive efficiency indexes were regressed onto age, vulva width and the AFC using the PROCREG procedure. Vulva width was greater (P = 0.05) in the high-AFC class cows (8.81 ± 0.12 cm) in comparison to those of the low (8.38 ± 0.13 cm) and average (8.42 ± 0.11 cm) classes, and was not influenced (P = 0.08) by parity (8.37 ± 0.11 and 8.77 ± 0.14 cm for heifers and cows, respectively). Vulva width was larger in cows with lower calving intervals (r2 = –0.21 P = 0.0008), but was not correlated with age at first calving (P = 0.78). Antral follicle counts were similar (P = 0.71) between heifers (38.6 ± 23.96) and cows (38.9 ± 28.00). Calving intervals were shorter in females with higher AFC (r2 = –0.17 P = 0.0064). Age was slightly related to a decrease in the AFC (r2 = –0.066 P < 0.0001). Vulva width and antral follicle count were correlated and were indicators of reproductive efficiency in females of the Tabapuã breed under the present experimental conditions. To our knowledge, this is the first report where vulva width, a fairly simple to detectable phenotype, was correlated with fertility.

The aim of this study was to enhance ovarian follicular development and subsequent oocyte retrieval by the use of a combined equine chorionic gonadotropin (eCG) and recombinant bovine somatotropin (rbST) protocol, as well as to compare its efficiency between the Brazilian zebu breed Tabapua (TAB) and Holstein (HOL) nulliparous heifers. In a changeover design, TAB (n = 16) and HOL (n = 12) were allocated to 1 of 2 protocols in 2 distinct periods. Two days before initiation of the protocols (D2), dominant follicles were ablated by transvaginal ultrasound-guided aspiration: Group 1: on day 0 (D0) a subcutaneous injection of 500 mg of rbST (Boostin®, Intervet, SP) and on D2 an intramuscular injection of 500 IU of eCG (Novormon®, Schering-Plough-Intervet, SP); and control: vehicle only. Two days later (D4), ovum pickup (OPU) was performed and the ovarian follicle population was evaluated by ultrasound. Twenty days after the first OPU session, heifers were switched over across treatments and were aspirated a second time, so that a total of 28 sessions were performed for each treatment. Main effects of period, breed, and protocol and their interactions on follicle numbers and oocyte yield were analysed through the GENMOD procedure of SAS (SAS®, Cary, NC, USA) using the Poisson distribution option. Means were compared by orthogonal contrasts, and the probability value set at 0.05 for significance unless otherwise specified. There was an interaction effect between hormonal stimulation and breed (P < 0.05) on the number of aspirated follicles (2 to 10 mm in diameter) such that they were higher in TAB treated (41.4 ± 2.6) compared with control (29.9 ± 2.6) heifers and did not differ between the HOL heifers (15.5 ± 2.6 v. 14.4 ± 2.6 in treated and control heifers, respectively). Overall, follicle numbers were higher (P < 0.0001) in TAB (35.6 ± 1.84) than in HOL (15.0 ± 2.1) heifers and in treated (28.4 ± 2.0) v. control (22.1 ± 2.0) heifers (P < 0.001). There was no effect (P = 0.77) of treatment on total viable oocytes (grades 1 to 3) between treated (3.5 ± 1.2) and control (3.9 ± 1.1) heifers. Tabapuã heifers had more (P < 0.05) viable oocytes than HOL (5.9 ± 0.9 v. 1.6 ± 1.4). In conclusion, the proposed protocol may improve OPU results but viable oocyte yield was not associated to the higher number of follicles available for aspiration. It may be necessary to modify this protocol to improve results perhaps by increasing the time window between rbST and eCG injections as well as by increasing the rbST dosage for heifers. The present protocol may be cost saving, compared with follicle stimulating hormone, for initial OPU sessions in the case of Tabapuã heifers because it is expected that responses decrease after a sequence of eCG injections. It is also interesting to notice that it is possible that HOL heifers already have higher endogenous growth hormone concentrations, which could help to explain the interactive effect observed in the ovarian response. Further studies are necessary to improve this protocol especially in HOL heifers. CNPQ, CAPES, Schering-Plough-Intervet.

RESUMO: Objetivou-se comparar por meio do Fator de Bayes (FB), modelos para estimar componentes de covariância, parâmetros genéticos e valores genéticos para os pesos ajustados aos 205 (P205), 365 (P365) e 550 (P550) dias de idade em animais da raça Tabapuã, criados a pasto no Nordeste do Brasil. Foram utilizadas informações de 26.838 animais no período entre 1975 a 2007 provenientes do controle de desenvolvimento ponderal da Associação Brasileira de Criadores de Zebu (ABCZ). Os componentes de covariância e parâmetros genéticos foram estimados pela abordagem bayesiana em análises uni e bicaracterísticas utilizando-se o programa GIBBS3F90. O modelo completo proporcionou melhor ajuste para a estimativa dos parâmetros genéticos para as características P205 e P365. Quanto à característica P550, o modelo que proporcionou o melhor ajuste foi o que não incluiu o efeito de ambiente permanente. As tendências genéticas de efeito direto foram significativas para as características P205, P365 e P550, correspondendo a incrementos de 2,67 kg, 7,35 kg e 8,32 kg, respectivamente, durante os 32 anos avaliados. As tendências fenotípicas foram significativas apenas para as características P205 e P365, correspondendo a incrementos de 26,82 kg e 22,42 kg, respectivamente. As correlações genéticas entre o peso aos 205, 365 e 550 dias de idade foram de alta magnitude (P205P365=0,90; P205P550=0,90 e P365P550=0,98), podendo-se obter ganhos genéticos via resposta correlacionada para os pesos aos 365 e 550 dias de idade ao selecionar o P205.

Foram estimados parâmetros genéticos para pesos do nascimento aos 570 dias de idade para 35.308 animais da raça Tabapuã, nascidos entre 1975 e 2000, pertencentes à ABCZ (Associação Brasileira de Criadores de Zebu) sob três modelos distintos. O modelo 1 incluiu o efeito genético aditivo direto como aleatório, além dos efeitos fixos de grupo de contemporâneos, definido pelas variáveis: proprietário, rebanho, criador, rebanho do criador, sexo, condição de criação, ano e mês de nascimento, ano e mês da pesagem, e os efeitos linear e quadrático de idade do bezerro e idade da vaca ao parto como covariáveis. O modelo 2 compreendeu, além dos efeitos supracitados, o efeito de ambiente permanente materno. O modelo 3 constou dos efeitos genético aditivo direto e materno e de ambiente permanente materno (aleatórios) e os mesmos incluídos no modelo 1 (fixos). De acordo com o teste de razão de verossimilhança, o modelo 3 foi o mais adequado para ajustar os efeitos estudados. As estimativas de herdabilidade direta foram baixas a moderadas (0,08 a 0,26), decrescendo do nascimento às idades subseqüentes, com picos aos 90 e aos 180 dias de idade. Aos 345 dias de idade, ocorreu novo aumento nas estimativas, com menor oscilação entre as estimativas subseqüentes até 570 dias de idade. As estimativas de herdabilidade materna foram baixas, sendo maiores no período da desmama.

Bovine genetic selection for fertility is difficult in part due to the low heritability of fertility traits and to the extension of the calving interval and the productive life length inherent to this species, which makes it harder to identify superior individuals from their records. In this regard, it is feasible to try to identify characteristics that are easy to detect and may be linked to superior reproductive efficiency as early as possible in females. The objective was to evaluate the possible relationships between vulva width, antral follicle counts (AFC), and the serum concentrations of anti-Mullerian hormone (AMH). Tabapuã (a Brazilian Zebu breed) heifers (n = 155) and cows (n = 422) from 4 herds were used in the study in which all antral follicles ≥3 mm were counted directly with an ultrasound unit. Follicle counts were classified into 2 classes, based on the methodology proposed by Burns et al. (2005) in dairy cattle, such that the low and intermediate AFC classes were merged into one class (low; n = 245) and the high and very high into another (high; n = 332). The vulva width was determined by measuring the distance between the lateral borders of the vulva with a digital caliper placed at a 90-degree angle from the half point of the rima vulvae. Single blood samples were collected from a subgroup of animals (n = 220) and the serum frozen (–20°C) after centrifugation for the AMH analysis, which was performed by specific bovine ELISA (Ansh Laboratories, Webster, TX, USA) test. All statistical analyses were performed with SAS (SAS Institute Inc., Cary, NC, USA). Data was submitted for analyses of variance using the PROCGENMOD procedure. Vulva width was larger (P = 0.02) in the class of animals of the high AFC (8.73 ± 0.11 cm) in comparison with those of the low AFC (8.39 ± 0.09 cm), considering the larger sample (n = 591). In the subsample (n = 220) the concentration of AMH was higher (P < 0.0001) in the high AFC class females (1.15 ± 0.07 ng mL–1; n = 95) in comparison with the low AFC class (0.50 ± 0.06 ng mL–1; n = 125). Vulva width, AFC, and AMH serum concentrations were interrelated and likely fertility indicative phenotypes under the present experimental conditions and should be further evaluated in larger samples in order to be considered in bovine genetic selection.

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In the 90s, researchers started studying the seminal proteic plasma profile and its relationship with fertility, whose objective was to study the function of each protein within the sperma frame in domestic species. In animal reproduction, another relevant factor for a good reproductive performance is feeding, being the probiotic the goal of unnumbered researchs reporting the use of them for weight gain, and food conversion. The present work had the objective of evaluating the winter and summer effects on the seminal plasma proteins, using SDS - PAG electroforesis and investigating the probiotic influence on weight, scrotum girth and spermiogram in Tabapuã bred bulls on range breeding. The 6 Kda proteic bands (81,81% in winter and 90,90% in summer) 9 Kda (90,90% in winter and 72,72% in summer) and 125 kda (81,81% in winter and 90,90% in summer) showed, in both seasons, the largest percentages among all the identified bands, the same happening with the 26 Kda band (100%) in summer. It was concluded that the seasons of the year can influence the presence or absence of seminal plasma proteins, however this has no relationship with the spermatic quality. The probiotic has not caused deleterious effect in the bulls' spermograms, and also has not exhibited a pro-action for weight gain and increasing of scrotal perimeter.
Na década de 90, iniciou-se o estudo do perfil protéico do plasma seminal e sua relação com a fertilidade, cujo objetivo era estudar a função de cada proteína no quadro espermático, nas espécies domésticas. Na reprodução animal, outro fator relevante, para um bom desempenho reprodutivo, é a alimentação, sendo os probióticos alvo de várias pesquisas relatando o uso do mesmo para o ganho de peso e conversão alimentar. O presente estudo teve o objetivo de avaliar o efeito do inverno e verão, sobre as proteínas do plasma seminal, por meio da eletroforese SDS-PAGE e investigar a influência do probiótico no peso, perímetro escrotal e espermiograma de touros da raça Tabapuã criados extensivamente. As bandas protéicas de 6 Kda (81,81% no inverno e 90,90% no verão), 9 KDa (90,90 no inverno e 72,72% no verão) e 125 Kda (81,81% no inverno e 90,90% no verão), apresentaram, nas duas estações, as maiores percentagens dentre todas as bandas identificadas, o mesmo ocorrendo com a banda de 26 KDa (100%) no verão. Conclui-se que: as estações do ano podem influenciar na presença ou ausência de proteínas do plasma seminal, entretanto isso não tem relação direta com a qualidade espermática. O probiótico não ocasionou efeito deletério no espermograma dos touros, no entanto, não demonstrou ação promotora para o ganho de peso e aumento do perímetro escrotal.

Orientador: Danísio Prado Munari
Coorientador: Daniela do Amaral Grossi
Coorientador: Rodrigo Pelicioni Savegnago
Banca: Ricardo da Fonseca
Banca: Cintia Righetti Marcondes
Resumo: A raça de bovinos de corte Tabapuã possui características desejáveis para as condições tropicais de produção como rusticidade e adaptabilidade. No entanto, é uma raça de formação recente e existem poucos estudos da estrutura populacional, variabilidade genética, endogamia e estimativas de parâmetros genéticos para características de interesse econômico. Este trabalho teve dois objetivos principais. O primeiro foi avaliar e descrever a estrutura populacional da raça Tabapuã e a relação linear de classes de coeficiente de endogamia com as médias dos valores fenotípicos de peso ao desmame ajustado para 210 dias de idade (P210), idade ao primeiro parto (IPP), intervalo de partos médio (IPM), primeiro intervalo de partos (IP1), segundo intervalo de partos (IP2) e produtividade acumulada (PAC). O segundo objetivo foi estimar parâmetros genéticos, tendências genéticas e eficiência relativa de seleção para P210, IPP, IPM, IP1 e PAC em uma população de bovinos Tabapuã. Foram utilizados registros fenotípicos de 7.340 vacas da raça Tabapuã, pertencentes ao Programa de Melhoramento Genético da Raça Tabapuã (PMGRT) mantido pela Associação Nacional de Criadores e Pesquisadores (ANCP). O arquivo de pedigree continha 15.241 animais. A análise de estrutura populacional foi realizada por meio do programa ENDOG. As estimativas dos parâmetros genéticos foram obtidas pelo método de máxima verossimilhança restrita, utilizando modelo animal multicaracterística. O teste de razão de verossimilhança foi utilizado para definir os efeitos aleatórios para análise de P210. O modelo animal de P210 incluiu os efeitos aleatórios genético aditivo materno e de ambiente permanente, além do efeito genético aditivo direto e do efeito residual e efeitos fixos. Para IPP, IPM, IP1 e PAC consideraram-se apenas o efeito aleatório genético aditivo direto, efeito aleatório residual e efeitos fixos. As tendências genéticas ...
Abstract: Tabapuã is a rustic beef cattle breed that is highly adapted to tropical environmental conditions. Due Tabapuã recent origin, there are only a few studies about population structure and genetic parameters. Thus, this study had two main objectives. The first was to evaluate the population structure and relationship of inbreeding coefficient and the phenotype of weaning weight adjusted at 210 days of age (W210), age at first calving (AFC), average of calving interval (ACI), first calving interval (CI1), second calving interval (CI2), and accumulated productivity (ACP). The second was to estimate genetic parameters, genetic trends and relative efficiency of selection for W210, AFC, ACI, CI1, and ACP in Tabapuã beef cattle. We used pedigree information of 15,241 animals and phenotypic information of 7,340 Tabapuã cows included in the Brazilian Tabapuã Breeding Program. Analysis of population structure was performed using ENDOG software. Estimates of genetic parameters were obtained by restricted maximum likelihood method, fitting a multiple-trait animal model. The likelihood ratio test was used to define the random effects for W210 analysis. For W210 the maternal genetic, permanent environmental, additive genetic, and residual effects were included in model; while only the additive genetic and residual effects were included for AFC, ACI, CI1, and ACP. Genetic trends were calculated from a linear regression of predicted breeding value on birth year. Average pedigree completeness was 47.99% for 6 last generations. Complete, maximum and equivalent generations were 5, 16 and 6.66, respectively. Effective number of founders and ancestors was equal to 124 and 110, respectively, and the ratio between both was 1.13. The average inbreeding coefficient was equal to 0.0072.The average inbreeding coefficient as well as the average relatedness and the percentage of number of inbred animals increased across generation. However, it was observed ...
Mestre

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A raça de bovinos de corte Tabapuã possui características desejáveis para as condições tropicais de produção como rusticidade e adaptabilidade. No entanto, é uma raça de formação recente e existem poucos estudos da estrutura populacional, variabilidade genética, endogamia e estimativas de parâmetros genéticos para características de interesse econômico. Este trabalho teve dois objetivos principais. O primeiro foi avaliar e descrever a estrutura populacional da raça Tabapuã e a relação linear de classes de coeficiente de endogamia com as médias dos valores fenotípicos de peso ao desmame ajustado para 210 dias de idade (P210), idade ao primeiro parto (IPP), intervalo de partos médio (IPM), primeiro intervalo de partos (IP1), segundo intervalo de partos (IP2) e produtividade acumulada (PAC). O segundo objetivo foi estimar parâmetros genéticos, tendências genéticas e eficiência relativa de seleção para P210, IPP, IPM, IP1 e PAC em uma população de bovinos Tabapuã. Foram utilizados registros fenotípicos de 7.340 vacas da raça Tabapuã, pertencentes ao Programa de Melhoramento Genético da Raça Tabapuã (PMGRT) mantido pela Associação Nacional de Criadores e Pesquisadores (ANCP). O arquivo de pedigree continha 15.241 animais. A análise de estrutura populacional foi realizada por meio do programa ENDOG. As estimativas dos parâmetros genéticos foram obtidas pelo método de máxima verossimilhança restrita, utilizando modelo animal multicaracterística. O teste de razão de verossimilhança foi utilizado para definir os efeitos aleatórios para análise de P210. O modelo animal de P210 incluiu os efeitos aleatórios genético aditivo materno e de ambiente permanente, além do efeito genético aditivo direto e do efeito residual e efeitos fixos. Para IPP, IPM, IP1 e PAC consideraram-se apenas o efeito aleatório genético aditivo direto, efeito aleatório residual e efeitos fixos. As tendências genéticas ...
Tabapuã is a rustic beef cattle breed that is highly adapted to tropical environmental conditions. Due Tabapuã recent origin, there are only a few studies about population structure and genetic parameters. Thus, this study had two main objectives. The first was to evaluate the population structure and relationship of inbreeding coefficient and the phenotype of weaning weight adjusted at 210 days of age (W210), age at first calving (AFC), average of calving interval (ACI), first calving interval (CI1), second calving interval (CI2), and accumulated productivity (ACP). The second was to estimate genetic parameters, genetic trends and relative efficiency of selection for W210, AFC, ACI, CI1, and ACP in Tabapuã beef cattle. We used pedigree information of 15,241 animals and phenotypic information of 7,340 Tabapuã cows included in the Brazilian Tabapuã Breeding Program. Analysis of population structure was performed using ENDOG software. Estimates of genetic parameters were obtained by restricted maximum likelihood method, fitting a multiple-trait animal model. The likelihood ratio test was used to define the random effects for W210 analysis. For W210 the maternal genetic, permanent environmental, additive genetic, and residual effects were included in model; while only the additive genetic and residual effects were included for AFC, ACI, CI1, and ACP. Genetic trends were calculated from a linear regression of predicted breeding value on birth year. Average pedigree completeness was 47.99% for 6 last generations. Complete, maximum and equivalent generations were 5, 16 and 6.66, respectively. Effective number of founders and ancestors was equal to 124 and 110, respectively, and the ratio between both was 1.13. The average inbreeding coefficient was equal to 0.0072.The average inbreeding coefficient as well as the average relatedness and the percentage of number of inbred animals increased across generation. However, it was observed ...

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The aim of the study was to evaluate the effect of bovine somatotropin in follicular deviation of sixteen Tabapuã cows. The animals received an ear implant of progesterone and 1 mg of estradiol benzoate, IM (day 0). On day 5, the females were divided into 2 groups: GI (control, n=8) and GII (treated with 500 mg bST, n=8). On day 10, the implants were removed and injected 500 µg of PGF2α in all cows. Only cows with follicles bigger 9 mm received 300 µg of GnRH. Ultrasound examinations were performed each 12 hours. There was no statistical difference between the follicular deviation in GI (2.4 days) and GII (2,1 days). At the divergence moment, FD and FS of GI were 6.28±0.42 and 6.26±0.41 mm, respectively, and FD and FS of GII were 6.08±0.72 and 6.12±0.39 mm. The mean maximum diameter of FD after ovulation was at 110.0±8.43 hours in GI and 115.2±8.98 hours in GII. FS reached the maximum diameter at 55.0±20.0 hours in GI and 76.8±10.46 hours in GII. The mean maximum diameter reached by FD and FS in GI was 8.85±0.41 and 6.5±0.42 mm, respectively, and GII 9.83±0.63 and 6.87±0.35 mm. There was no significant difference (p> 0.05) in diameter of FD and FS, neither in growth rates (mm/12 hours) of the FD before and after the deviation, neither in the moment of follicle deviation
O objetivo do presente estudo foi avaliar o efeito da somatotrofina bovina na divergência folicular em vacas da raça Tabapuã. Foram utilizadas 16 vacas da raça Tabapuã, inicialmente receberam implante de progestágeno auricular concomitante à aplicação IM de 1mg de benzoato de estradiol (dia 0). No dia 5, dividiram-se as fêmeas em 2 grupos: G-I (controle, n=8) e as vacas do G-II foram tratadas com 500 mg bST (n=8). No dia 10 foi feita a retirada do crestar concomitante a aplicação de 500 g de PGF2 e apenas nas vacas com folículos> 9 mm aplicação de 300 g de GnRH. Foram realizados exames ultrassonográficos a cada 12 horas por 5 dias. Não houve diferença estatística entre os momentos de divergência folicular, no G-I foi de 2,4 dias e no G-II 2,1 dias. Nesse momento o FD e FS mediram 6,28  0,42 e 6,26  0,41 mm no G-I e 6,08  0,72 e 6,12  0,39 mm no G-II. O FD atingiu diâmetro máximo após a ovulação em média 110,00 ± 8,43 horas no GI e 115,20 ± 8,98 horas no GII. Já o FS atingiu o diâmetro máximo às 55,00 ± 20,00 e 76,80 ± 10,46 horas, respectivamente. A média do diâmetro máximo atingido pelo FD e FS no GI foi respectivamente 8,85 ± 0,41 e 6,50 ± 0,42 mm e no GII foi 9,83 ± 0,63 e 6,87 ± 0,35 mm. Não houve diferença significativa (p>0,05) no diâmetro do FD e FS e nem nas taxas de crescimento (mm/12h) do FD antes e após a divergência folicular. Concluímos que a aplicação de bST não afetou o diâmetro folicular, a taxa de crescimento do FD e FS antes e após a divergência, nem tampouco, o momento da divergência folicular