RESUMO

Background: Heat stress indexes integrate several variables of the thermal environment in a single figure and predict their impact on animal welfare and performance. The correct interpretation of these indexes is of help in the choice of more adequate measures to attenuate the stress caused by the heat. Therefore, the aim of this research is to examine some of the heat stress indexes mentioned in the literature and to decide which ones best reflect the potential impact of meteorological conditions on the thermal homeostasis of half-blood dairy heifers bred in Uberlândia, Triângulo Mineiro area, Minas Gerais, Brazil.Materials, Methods & Results: Eight half-blood dairy heifers were exposed to direct sunlight from 9 h to 13 h in the months of November and December of 2016, and also January and February of 2017, 5 days per month on average, in Uberlândia, MG, Brazil. After this challenge, the respiratory rate and the rectal temperature were measured. Simultaneously to the collection of physiological variables, the temperatures of dry bulb and wet bulb, as well as that of black globe, were quantified, as was the wind speed. Afterwards, the solar radiation, the relative humidity, the mean radiant temperature and some heat stress indexes were calculated, the latter being Temperature-Humidity Index, Black Globe-Humidity Index, Equivalent Temperature Index, Environmental Stress Inde

RESUMO

Background: Heat stress indexes integrate several variables of the thermal environment in a single figure and predict their impact on animal welfare and performance. The correct interpretation of these indexes is of help in the choice of more adequate measures to attenuate the stress caused by the heat. Therefore, the aim of this research is to examine some of the heat stress indexes mentioned in the literature and to decide which ones best reflect the potential impact of meteorological conditions on the thermal homeostasis of half-blood dairy heifers bred in Uberlândia, Triângulo Mineiro area, Minas Gerais, Brazil.Materials, Methods & Results: Eight half-blood dairy heifers were exposed to direct sunlight from 9 h to 13 h in the months of November and December of 2016, and also January and February of 2017, 5 days per month on average, in Uberlândia, MG, Brazil. After this challenge, the respiratory rate and the rectal temperature were measured. Simultaneously to the collection of physiological variables, the temperatures of dry bulb and wet bulb, as well as that of black globe, were quantified, as was the wind speed. Afterwards, the solar radiation, the relative humidity, the mean radiant temperature and some heat stress indexes were calculated, the latter being Temperature-Humidity Index, Black Globe-Humidity Index, Equivalent Temperature Index, Environmental Stress Inde

RESUMO

Background: Heat stress indexes integrate several variables of the thermal environment in a single figure and predict their impact on animal welfare and performance. The correct interpretation of these indexes is of help in the choice of more adequate measures to attenuate the stress caused by the heat. Therefore, the aim of this research is to examine some of the heat stress indexes mentioned in the literature and to decide which ones best reflect the potential impact of meteorological conditions on the thermal homeostasis of half-blood dairy heifers bred in Uberlândia, Triângulo Mineiro area, Minas Gerais, Brazil.Materials, Methods & Results: Eight half-blood dairy heifers were exposed to direct sunlight from 9 h to 13 h in the months of November and December of 2016, and also January and February of 2017, 5 days per month on average, in Uberlândia, MG, Brazil. After this challenge, the respiratory rate and the rectal temperature were measured. Simultaneously to the collection of physiological variables, the temperatures of dry bulb and wet bulb, as well as that of black globe, were quantified, as was the wind speed. Afterwards, the solar radiation, the relative humidity, the mean radiant temperature and some heat stress indexes were calculated, the latter being Temperature-Humidity Index, Black Globe-Humidity Index, Equivalent Temperature Index, Environmental Stress Inde

RESUMO

Background: Heat stress indexes integrate several variables of the thermal environment in a single figure and predict their impact on animal welfare and performance. The correct interpretation of these indexes is of help in the choice of more adequate measures to attenuate the stress caused by the heat. Therefore, the aim of this research is to examine some of the heat stress indexes mentioned in the literature and to decide which ones best reflect the potential impact of meteorological conditions on the thermal homeostasis of half-blood dairy heifers bred in Uberlândia, Triângulo Mineiro area, Minas Gerais, Brazil.Materials, Methods & Results: Eight half-blood dairy heifers were exposed to direct sunlight from 9 h to 13 h in the months of November and December of 2016, and also January and February of 2017, 5 days per month on average, in Uberlândia, MG, Brazil. After this challenge, the respiratory rate and the rectal temperature were measured. Simultaneously to the collection of physiological variables, the temperatures of dry bulb and wet bulb, as well as that of black globe, were quantified, as was the wind speed. Afterwards, the solar radiation, the relative humidity, the mean radiant temperature and some heat stress indexes were calculated, the latter being Temperature-Humidity Index, Black Globe-Humidity Index, Equivalent Temperature Index, Environmental Stress Inde

RESUMO

Background: Heat stress indexes integrate several variables of the thermal environment in a single figure and predict their impact on animal welfare and performance. The correct interpretation of these indexes is of help in the choice of more adequate measures to attenuate the stress caused by the heat. Therefore, the aim of this research is to examine some of the heat stress indexes mentioned in the literature and to decide which ones best reflect the potential impact of meteorological conditions on the thermal homeostasis of half-blood dairy heifers bred in Uberlândia, Triângulo Mineiro area, Minas Gerais, Brazil.Materials, Methods & Results: Eight half-blood dairy heifers were exposed to direct sunlight from 9 h to 13 h in the months of November and December of 2016, and also January and February of 2017, 5 days per month on average, in Uberlândia, MG, Brazil. After this challenge, the respiratory rate and the rectal temperature were measured. Simultaneously to the collection of physiological variables, the temperatures of dry bulb and wet bulb, as well as that of black globe, were quantified, as was the wind speed. Afterwards, the solar radiation, the relative humidity, the mean radiant temperature and some heat stress indexes were calculated, the latter being Temperature-Humidity Index, Black Globe-Humidity Index, Equivalent Temperature Index, Environmental Stress Inde

RESUMO

Background: Heat stress indexes integrate several variables of the thermal environment in a single figure and predict their impact on animal welfare and performance. The correct interpretation of these indexes is of help in the choice of more adequate measures to attenuate the stress caused by the heat. Therefore, the aim of this research is to examine some of the heat stress indexes mentioned in the literature and to decide which ones best reflect the potential impact of meteorological conditions on the thermal homeostasis of half-blood dairy heifers bred in Uberlândia, Triângulo Mineiro area, Minas Gerais, Brazil.Materials, Methods & Results: Eight half-blood dairy heifers were exposed to direct sunlight from 9 h to 13 h in the months of November and December of 2016, and also January and February of 2017, 5 days per month on average, in Uberlândia, MG, Brazil. After this challenge, the respiratory rate and the rectal temperature were measured. Simultaneously to the collection of physiological variables, the temperatures of dry bulb and wet bulb, as well as that of black globe, were quantified, as was the wind speed. Afterwards, the solar radiation, the relative humidity, the mean radiant temperature and some heat stress indexes were calculated, the latter being Temperature-Humidity Index, Black Globe-Humidity Index, Equivalent Temperature Index, Environmental Stress Inde

RESUMO

Cattle, when in heat stress, deflect energy to increase dissipation to environment, compromising productivity. Thus, in dairy production system it is important to maintain thermal comfort to ensure homeothermy and full performance. One of the physiological measures to evaluate thermal comfort of domestic animals is hair coat surface temperature. Knowing this temperature allows the understanding whether animal performs thermal exchanges by convection through the activation of heat dissipation latent mechanisms. This study aimed to evaluate body surface temperature in crossbred dairy cows on Triângulo Mineiro climatic conditions. This was carried out at Estação Experimental Glória of Universidade Federal de Uberlândia using 53 lactating crossbred cows. Cows were housed in shaded pen for artificial insemination and after it was performed body surface temperature mensurements. Temperature was measured from body surface at four different regions: forehead, withers, groin and hock using an Instruterm infrared thermometer model TI-890. The statistical model used the region to test the effect of surface temperature comparing means by Tukeys test, with a significance level of 5%. Means and standard deviations of ambient temperature, maximum temperature, minimum temperature and relative humidity were respectively 23.96 ± 2.57C; 29.43 ± 2.50C; 17.54 ± 2.38C; and 67.18 ± 15.39%. Temper

O artigo não apresenta resumo em português.

RESUMO

In tropical and subtropical regions animals suffer pronounced heat stress effect on reproductive function, being one of the most noticeable effects the reduction of conception rate. When evaluating animals heat stress, rectal temperature measurement is important tool because indicates heat release mechanisms became insufficient to maintain homeothermy. This study aimed to evaluate body temperature at fixed time artificial insemination of crossbred dairy cows and their conception at 30 days pregnacy. Experiment was performed from April 26, 2010 to January 28, 2012 at Estação Experimental Glória of Universidade Federal de Uberlândia, at Triângulo Mineiro, Brazil. One hundred-twelve crossbred dairy cows and heifers were used. At the moment of insemination, animals were housed in shaded pen and body temperature was collect using clinical thermometer introduced in rectal mucosa. Environmental variables collect were air temperature, maximum temperature, minimum temperature and relative humidity. Data were analyzed in two different periods: from April to September (mild weather-MW) and from October to March (hot weather-HW). The statistical model included the effect of category, period, pregnancy diagnosis and their interactions, comparing means by Tukeys test, with a significance level of 5%. Means and standard deviations of air temperature, maximum temperature, minimum temperature

ptmo em português.

RESUMO

In tropical and subtropical regions animals suffer pronounced heat stress effect on reproductive function, being one of the most noticeable effects the reduction of conception rate. When evaluating animals heat stress, rectal temperature measurement is important tool because indicates heat release mechanisms became insufficient to maintain homeothermy. This study aimed to evaluate body temperature at fixed time artificial insemination of crossbred dairy cows and their conception at 30 days pregnacy. Experiment was performed from April 26, 2010 to January 28, 2012 at Estação Experimental Glória of Universidade Federal de Uberlândia, at Triângulo Mineiro, Brazil. One hundred-twelve crossbred dairy cows and heifers were used. At the moment of insemination, animals were housed in shaded pen and body temperature was collect using clinical thermometer introduced in rectal mucosa. Environmental variables collect were air temperature, maximum temperature, minimum temperature and relative humidity. Data were analyzed in two different periods: from April to September (mild weather-MW) and from October to March (hot weather-HW). The statistical model included the effect of category, period, pregnancy diagnosis and their interactions, comparing means by Tukeys test, with a significance level of 5%. Means and standard deviations of air temperature, maximum temperature, minimum temperature

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RESUMO

Cattle, when in heat stress, deflect energy to increase dissipation to environment, compromising productivity. Thus, in dairy production system it is important to maintain thermal comfort to ensure homeothermy and full performance. One of the physiological measures to evaluate thermal comfort of domestic animals is hair coat surface temperature. Knowing this temperature allows the understanding whether animal performs thermal exchanges by convection through the activation of heat dissipation latent mechanisms. This study aimed to evaluate body surface temperature in crossbred dairy cows on Triângulo Mineiro climatic conditions. This was carried out at Estação Experimental Glória of Universidade Federal de Uberlândia using 53 lactating crossbred cows. Cows were housed in shaded pen for artificial insemination and after it was performed body surface temperature mensurements. Temperature was measured from body surface at four different regions: forehead, withers, groin and hock using an Instruterm infrared thermometer model TI-890. The statistical model used the region to test the effect of surface temperature comparing means by Tukeys test, with a significance level of 5%. Means and standard deviations of ambient temperature, maximum temperature, minimum temperature and relative humidity were respectively 23.96 ± 2.57C; 29.43 ± 2.50C; 17.54 ± 2.38C; and 67.18 ± 15.39%. Temper

O artigo não apresenta resumo em português.

RESUMO

The objective of this study was to compare serum concentrations of the hormones triiodothyronine (T3) and thyroxine (T4) in pigs on commercial line beginning and end of growing-finishing phase, correlating them with productive performance and quality characteristics of carcass and meat. Blood samples were collected from 48 animals at the beginning and end of growing-finishing phase by puncturing the jugular vein, around the same time (08:00 to 10:00a.m.). Measurements of serum thyroid hormones were made by enzyme-immunoassay. It was evaluated the performance and quality of carcass and meat. At the beginning and end of the housing, serum T3 concentrations were 1.85 and 1.32nmol L-1, respectively, and T4 of 100.33 and 86.53nmol L-1, respectively. There was negative correlation between T3 and low-end and average daily weight gain, final weight and backfat thickness. Inicial T4 was moderately and moderately negatively correlated with initial weight. The values of T3 and T4 in pigs early in the growing-finishing phase are larger than in termination. The thyroid hormones are associated with the initial and final weight, backfat thickness at the last lumbar, pH45min and pH24h of growing-finishing pigs.

Objetivou-se neste estudo comparar as concentrações séricas de triiodotironina (T3) e tiroxina (T4) em suínos de linhagem comercial no início e término da fase de crescimento-terminação, correlacionando-os com o desempenho produtivo, características de qualidade de carcaça e da carne. As amostras sanguíneas de 48 animais foram coletadas no início e no final da fase de crescimento-terminação por punção da veia jugular externa, sempre no mesmo horário (8-10h). As determinações séricas dos hormônios tireoideanos foram feitas por enzimaimunoensaio. Foram feitas avaliações de desempenho e de qualidade de carcaça e de carne. No início e final do alojamento, as concentrações séricas de T3 foram de 1,85 e 1,32nmol L-1, respectivamente, e para T4 de 100,33 e 86,53nmol L-1, respectivamente. Houve correlação negativa e baixa entre T3 final e ganho de peso médio diário, peso final e espessura de toucinho. T4 inicial correlacionou-se negativamente e moderadamente com peso inicial. Os valores de T3 e de T4 em suínos no início da fase de crescimento-terminação são maiores que na terminação. Os hormônios tireoideanos estão associados com o peso inicial e final, espessura de toucinho na última lombar, pH45min e pH24h de suínos em crescimento-terminação.

RESUMO

The objective of this study was to compare serum concentrations of the hormones triiodothyronine (T3) and thyroxine (T4) in pigs on commercial line beginning and end of growing-finishing phase, correlating them with productive performance and quality characteristics of carcass and meat. Blood samples were collected from 48 animals at the beginning and end of growing-finishing phase by puncturing the jugular vein, around the same time (08:00 to 10:00a.m.). Measurements of serum thyroid hormones were made by enzyme-immunoassay. It was evaluated the performance and quality of carcass and meat. At the beginning and end of the housing, serum T3 concentrations were 1.85 and 1.32nmol L-1, respectively, and T4 of 100.33 and 86.53nmol L-1, respectively. There was negative correlation between T3 and low-end and average daily weight gain, final weight and backfat thickness. Inicial T4 was moderately and moderately negatively correlated with initial weight. The values of T3 and T4 in pigs early in the growing-finishing phase are larger than in termination. The thyroid hormones are associated with the initial and final weight, backfat thickness at the last lumbar, pH45min and pH24h of growing-finishing pigs.

Objetivou-se neste estudo comparar as concentrações séricas de triiodotironina (T3) e tiroxina (T4) em suínos de linhagem comercial no início e término da fase de crescimento-terminação, correlacionando-os com o desempenho produtivo, características de qualidade de carcaça e da carne. As amostras sanguíneas de 48 animais foram coletadas no início e no final da fase de crescimento-terminação por punção da veia jugular externa, sempre no mesmo horário (8-10h). As determinações séricas dos hormônios tireoideanos foram feitas por enzimaimunoensaio. Foram feitas avaliações de desempenho e de qualidade de carcaça e de carne. No início e final do alojamento, as concentrações séricas de T3 foram de 1,85 e 1,32nmol L-1, respectivamente, e para T4 de 100,33 e 86,53nmol L-1, respectivamente. Houve correlação negativa e baixa entre T3 final e ganho de peso médio diário, peso final e espessura de toucinho. T4 inicial correlacionou-se negativamente e moderadamente com peso inicial. Os valores de T3 e de T4 em suínos no início da fase de crescimento-terminação são maiores que na terminação. Os hormônios tireoideanos estão associados com o peso inicial e final, espessura de toucinho na última lombar, pH45min e pH24h de suínos em crescimento-terminação.

RESUMO

The objective of this study was to compare serum concentrations of the hormones triiodothyronine (T3) and thyroxine (T4) in pigs on commercial line beginning and end of growing-finishing phase, correlating them with productive performance and quality characteristics of carcass and meat. Blood samples were collected from 48 animals at the beginning and end of growing-finishing phase by puncturing the jugular vein, around the same time (08:00 to 10:00a.m.). Measurements of serum thyroid hormones were made by enzyme-immunoassay. It was evaluated the performance and quality of carcass and meat. At the beginning and end of the housing, serum T3 concentrations were 1.85 and 1.32nmol L-1, respectively, and T4 of 100.33 and 86.53nmol L-1, respectively. There was negative correlation between T3 and low-end and average daily weight gain, final weight and backfat thickness. Inicial T4 was moderately and moderately negatively correlated with initial weight. The values of T3 and T4 in pigs early in the growing-finishing phase are larger than in termination. The thyroid hormones are associated with the initial and final weight, backfat thickness at the last lumbar, pH45min and pH24h of growing-finishing pigs.

Objetivou-se neste estudo comparar as concentrações séricas de triiodotironina (T3) e tiroxina (T4) em suínos de linhagem comercial no início e término da fase de crescimento-terminação, correlacionando-os com o desempenho produtivo, características de qualidade de carcaça e da carne. As amostras sanguíneas de 48 animais foram coletadas no início e no final da fase de crescimento-terminação por punção da veia jugular externa, sempre no mesmo horário (8-10h). As determinações séricas dos hormônios tireoideanos foram feitas por enzimaimunoensaio. Foram feitas avaliações de desempenho e de qualidade de carcaça e de carne. No início e final do alojamento, as concentrações séricas de T3 foram de 1,85 e 1,32nmol L-1, respectivamente, e para T4 de 100,33 e 86,53nmol L-1, respectivamente. Houve correlação negativa e baixa entre T3 final e ganho de peso médio diário, peso final e espessura de toucinho. T4 inicial correlacionou-se negativamente e moderadamente com peso inicial. Os valores de T3 e de T4 em suínos no início da fase de crescimento-terminação são maiores que na terminação. Os hormônios tireoideanos estão associados com o peso inicial e final, espessura de toucinho na última lombar, pH45min e pH24h de suínos em crescimento-terminação.

RESUMO

RESUMO: Com o objetivo de avaliar a influência da gestação sobre o perfil de alguns constituintes bioquímicos sanguineos, foram analisadas 144 amostras de sangue de novilhas da raça Holandês Preto e Branco, gestantes e não gestantes. Os valores médios e desvios padrão observados foram: proteínas totais 7,44 0,69 g/dL; albumina 3,16 0,41 g/dL; globulinas 4,28 0,83 g/dL; razão A/G 0,78 0,24; cálcio total 8,94 0,97 mg/dL; cálcio ionizado 4,93 0,58 mg/dL; fósforo 6,24 1,00 mg/dL; razão Ca/P 1,47 0,32; magnésio 2,33 0,38 mg/dL; glicose 64,25 8,02 mg/dL; uréia 17,51 6,97 mg/dL; creatinina 1,62 0,32 mg/dL; AST 26,60 7,62 U/L e fosfatase alcalina 85,95 25,62 U/L. Foram observadas diferenças significativas entre novilhas gestantes e não gestantes na concentração de magnésio e AST. Com relação aos estádios da gestação, foram verificadas diferenças nos valores de fósforo, relação Ca/P, magnésio, creatinina e AST entre o terço inicial e médio da gestação; de proteínas totais, albumina, fósforo, razão Ca/P, uréia, creatinina, AST e fosfatase alcalina entre o terço médio e final da gestação, e de creatinina e AST entre o estádio inicial e final da gestação. Conclui-se que a gestação influencia nos valores de magnésio e AST, e os estádios da gestação nas proteínas totais, albumina, fósforo, razão Ca/P, magnésio, uréia, creatinina, AST e fosfatase alcalina.

RESUMO

RESUMO: Com o objetivo de avaliar a influência da gestação sobre o perfil de alguns constituintes bioquímicos sanguineos, foram analisadas 144 amostras de sangue de novilhas da raça Holandês Preto e Branco, gestantes e não gestantes. Os valores médios e desvios padrão observados foram: proteínas totais 7,44 0,69 g/dL; albumina 3,16 0,41 g/dL; globulinas 4,28 0,83 g/dL; razão A/G 0,78 0,24; cálcio total 8,94 0,97 mg/dL; cálcio ionizado 4,93 0,58 mg/dL; fósforo 6,24 1,00 mg/dL; razão Ca/P 1,47 0,32; magnésio 2,33 0,38 mg/dL; glicose 64,25 8,02 mg/dL; uréia 17,51 6,97 mg/dL; creatinina 1,62 0,32 mg/dL; AST 26,60 7,62 U/L e fosfatase alcalina 85,95 25,62 U/L. Foram observadas diferenças significativas entre novilhas gestantes e não gestantes na concentração de magnésio e AST. Com relação aos estádios da gestação, foram verificadas diferenças nos valores de fósforo, relação Ca/P, magnésio, creatinina e AST entre o terço inicial e médio da gestação; de proteínas totais, albumina, fósforo, razão Ca/P, uréia, creatinina, AST e fosfatase alcalina entre o terço médio e final da gestação, e de creatinina e AST entre o estádio inicial e final da gestação. Conclui-se que a gestação influencia nos valores de magnésio e AST, e os estádios da gestação nas proteínas totais, albumina, fósforo, razão Ca/P, magnésio, uréia, creatinina, AST e fosfatase alcalina.

RESUMO

The effects of biostimulation on the dimensions of ovarian structures, conception and pregnancy rates and weight gain were evaluated in Nelore heifers. In October 2005 the animals were divided in two treatments: biostimulated (BE), with the presence of vasectomized bulls with libido, and nonbiostimulated (NE), without the bull. Ultra-sonography exams were done for measurement of ovary, diameter of the largest follicle and corpora lutea when present, and also for pregnancy diagnose. Conception rate was of 100 and 80% and pregnancy rate of 62.5 and 25% for BE and NE groups, respectively. No changes on the initial and final ovarian dimensions or on the measurements of the diameter of the largest follicle and corpora lutea were observed between the groups. Treatments had significantly affected weight gain. Service rate per conception was smaller in BE. Biostimulation affect conception and pregnancy rate, but no effects on the ovary dimensions, diameter of the largest follicle and corpora lutea are observed. Decreasing weight gain and service rate per conception were observed in biostimulated heifers.

Avaliou-se o efeito da bioestimulação nas dimensões das estruturas ovarianas, nas taxas de concepção e de prenhez e no ganho de peso em novilhas da raça Nelore. Em outubro de 2005, dividiram-se igualmente as fêmeas (n=32) em dois tratamentos: bioestimulado (BE) com a presença de rufião; e não-bioestimulado (NE) na ausência do mesmo. Realizaram-se exames de ultra-sonografia para mensuração dos ovários, do diâmetro do folículo maior e do corpo lúteo, quando presente, e para diagnóstico de gestação. A taxa de concepção nas fêmeas bioestimuladas foi de 100,0% e naquelas não-bioestimuladas, 80,0%, enquanto a taxa de prenhez foi de 62,5 e 25%, respectivamente. Não houve alterações nas dimensões iniciais e finais dos ovários nem diferenças nos diâmetros do folículo maior e do corpo lúteo em cada grupo. Houve diferença significativa entre os grupos para ganho de peso. O número de serviços por concepção foi menor no grupo bioestimulado. A bioestimulação influencia positivamente as taxas de concepção e prenhez, mas não interfere nas dimensões do ovário, no diâmetro do folículo maior e do corpo lúteo. Novilhas bioestimuladas reduzem o ganho de peso e o número de serviço por concepção.

RESUMO

The effects of biostimulation on the dimensions of ovarian structures, conception and pregnancy rates and weight gain were evaluated in Nelore heifers. In October 2005 the animals were divided in two treatments: biostimulated (BE), with the presence of vasectomized bulls with libido, and nonbiostimulated (NE), without the bull. Ultra-sonography exams were done for measurement of ovary, diameter of the largest follicle and corpora lutea when present, and also for pregnancy diagnose. Conception rate was of 100 and 80% and pregnancy rate of 62.5 and 25% for BE and NE groups, respectively. No changes on the initial and final ovarian dimensions or on the measurements of the diameter of the largest follicle and corpora lutea were observed between the groups. Treatments had significantly affected weight gain. Service rate per conception was smaller in BE. Biostimulation affect conception and pregnancy rate, but no effects on the ovary dimensions, diameter of the largest follicle and corpora lutea are observed. Decreasing weight gain and service rate per conception were observed in biostimulated heifers.

Avaliou-se o efeito da bioestimulação nas dimensões das estruturas ovarianas, nas taxas de concepção e de prenhez e no ganho de peso em novilhas da raça Nelore. Em outubro de 2005, dividiram-se igualmente as fêmeas (n=32) em dois tratamentos: bioestimulado (BE) com a presença de rufião; e não-bioestimulado (NE) na ausência do mesmo. Realizaram-se exames de ultra-sonografia para mensuração dos ovários, do diâmetro do folículo maior e do corpo lúteo, quando presente, e para diagnóstico de gestação. A taxa de concepção nas fêmeas bioestimuladas foi de 100,0% e naquelas não-bioestimuladas, 80,0%, enquanto a taxa de prenhez foi de 62,5 e 25%, respectivamente. Não houve alterações nas dimensões iniciais e finais dos ovários nem diferenças nos diâmetros do folículo maior e do corpo lúteo em cada grupo. Houve diferença significativa entre os grupos para ganho de peso. O número de serviços por concepção foi menor no grupo bioestimulado. A bioestimulação influencia positivamente as taxas de concepção e prenhez, mas não interfere nas dimensões do ovário, no diâmetro do folículo maior e do corpo lúteo. Novilhas bioestimuladas reduzem o ganho de peso e o número de serviço por concepção.