Variações fisiológicas de parâmetros reprodutivos em vacas de raça Holandesa importadas da Hungria para o Nordeste brasileiro

Balázs, Bényei; Barros, Costa Celso Walter

doi:10.1590/s1413-95962000000300008

Cited by 2 publications

(1 citation statement)

References 11 publications

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“…Studies carried out by Bényei and Barros [28] demonstrated that exposure to stress in dairy cows during summer or in a hyperthermic environmental chamber (42˚C) during 7 days reduced the viability of embryos collected and increased the incidence of degenerated embryos and late development. In this study we had the same observations in EG 2 and EG 3 groups, in other words, formation of asymmetric divisions, embryos in the process of degeneration and developmental delay.…”

Section: Discussionmentioning

confidence: 99%

Effect of heat stress on the maturation, fertilization and development rates of <i>in vitro</i> produced bovine embryos

Alves¹,

Gonçalves

Pavão³

et al. 2013

OJAS

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Heat stress is one of the main reasons for reproductive performance decrease in cattle, resulting in severe economic losses. The aim of this study was to evaluate the effect of heat stress during maturation, fertilization and development of in vitro produced bovine embryos. Cumulus oocyte complexes (COCs) were obtained by follicular puncture from slaughterhouse ovaries and after identification, were divided into four groups: control (CG), exposed 1 (EG 1), exposed 2 (EG 2), and exposed 3 (EG 3). The oocytes of the group CG and CG 3 were cultured at 38˚C and the oocytes of group EG 1 and EG 2 were cultured at 40˚C during the maturation period (24 hours at 5% CO 2 in air). After the maturation period, oocytes of group CG, EG 1 , EG 2 , and EG 3 were fecundated with frozen thawed semen. The oocytes of CG, EG 2 and EG 3 groups were cultured at 38˚C, and the group EG 1 was cultured at 40˚C (18 hours at 5% CO 2 in air). After that, the CG and EG 2 groups were cultured in SOF at 38˚C and the groups EG 1 and EG 3 at 40˚C during embryonic development. The embryos were evaluated for cleavage, morula and blastocyst rates by optical microscopy. In control (CG) and EG 3 groups, the oocytes showed uniform expansion of cumulus cells, classified as moderate to high, with brown color and uniform appearance of the ooplasm. In the oocytes exposed to 40˚C (EG 1 and EG 2) we observed a decrease in the expansion of cumulus cells, and the same showed rounded appearance and re-traction of the ooplasm with dark coloration. The control group (CG) had 68.23% ± 2% of cleavage, 50.16% ± 2% morulas, and 43.28% ± 1% blastocysts. Whereas the EG 2 had 31.46% ± 2% cleavage, 35.64% ± 2% morula, and no blastocysts development. The EG 3 had 3.7% ± 2% cleavage, and no embryo production. These data suggest that in all stages of exposure to heat stress, the embryos and the gametes are susceptible, leading to a decrease in embryonic development.

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Section: Discussionmentioning

confidence: 99%

Effect of heat stress on the maturation, fertilization and development rates of <i>in vitro</i> produced bovine embryos

Alves¹,

Gonçalves

Pavão³

et al. 2013

OJAS

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Comportamento ingestivo e parâmetros fisiológicos de bovinos Sindi alimentados com teores crescentes de feno de erva-sal

Oliveira

Turco

Araújo

et al. 2012

Agraria

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RESUMOObjetivou-se avaliar o efeito das variáveis meteorológicas e das dietas com diferentes níveis de feno de ervasal (Atriplex nummularia Lindl.) e palma forrageira (Opuntia fícus indica Mill) sobre as respostas horárias dos parâmetros fisiológicos e comportamento ingestivo dos novilhos da raça Sindi. Foram utilizados oito animais da raça Sindi, distribuídos em quadrado latino duplo com quatro tratamentos: 15, 30, 45 e 60% de inclusão de feno de erva-sal, em quatro períodos. As variáveis meteorológicas ao longo do dia exerceram forte influência sobre todas as respostas fisiológicas dos animais. Entretanto, a distribuição das atividades do comportamento ingestivo (alimentação, ruminação e ócio), ao longo das 24 horas, foi ritmada pelos horários de distribuição do alimento, mostrando-se pouco influenciada pelas variáveis meteorológicas. O consumo das dietas experimentais, contendo os menores percentuais de feno de erva-sal pelos novilhos da raça Sindi, proporcionaram aumento na frequência respiratória dos animais, sem, no entanto, alterar a temperatura retal. Palavras-chave:Bem-estar, bioclimatologia, palma forrageira, semiárido, temperatura.Ingestive behavior and physiological parameters of Sindhi cattle fed increasing levels of saltbush hay ABSTRACTThe aim of this study was to evaluate the effect of the meteorological variables and the diets with different saltbush hay (Atriplex nummularia Lindl.) and forage (Opuntia fícus indica Mill) levels on the hourly responses of the physiological parameters and ingestive behavior of Sindi steers. Eight Sindhi breed animals were allotted to a double Latin square with four treatments: 15, 30, 45 and 60% inclusion of saltbush hay, in four periods. The meteorological variables throughout the day strongly influenced all physiological responses of the cattle. However, the distribution of the activities of ingestive behavior (eating, ruminating and idling), over 24 hours, was punctuated by the food distribution periods, proving to be little influenced by the meteorological variables. The consumption of the experimental diets containing the lowest percentage of saltbush hay by the Sindhi steers increased the respiratory rate of the animals, however, without changing the rectal temperature.

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Variações fisiológicas de parâmetros reprodutivos em vacas de raça Holandesa importadas da Hungria para o Nordeste brasileiro

Cited by 2 publications

References 11 publications

Effect of heat stress on the maturation, fertilization and development rates of <i>in vitro</i> produced bovine embryos

Effect of heat stress on the maturation, fertilization and development rates of <i>in vitro</i> produced bovine embryos

Comportamento ingestivo e parâmetros fisiológicos de bovinos Sindi alimentados com teores crescentes de feno de erva-sal

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Variações fisiológicas de parâmetros reprodutivos em vacas de raça Holandesa importadas da Hungria para o Nordeste brasileiro

Cited by 2 publications

References 11 publications

Effect of heat stress on the maturation, fertilization and development rates of &lt;i&gt;in vitro&lt;/i&gt; produced bovine embryos

Effect of heat stress on the maturation, fertilization and development rates of &lt;i&gt;in vitro&lt;/i&gt; produced bovine embryos

Comportamento ingestivo e parâmetros fisiológicos de bovinos Sindi alimentados com teores crescentes de feno de erva-sal

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Effect of heat stress on the maturation, fertilization and development rates of <i>in vitro</i> produced bovine embryos

Effect of heat stress on the maturation, fertilization and development rates of <i>in vitro</i> produced bovine embryos