Efeito do estresse térmico calórico agudo e crônico sobre a qualidade oocitária de bovinos de raças adaptadas

Fialho, A.L.L.; Souza-Cáceres, Mirela Brochado; Silva, Wilian Aparecido Leite da; Arruda, E. D. S.; Kischel, H.; Ribeiro-Ferreira, M.G.C.; Medeiros, Cleber Fontes de; Silva, J.R.; Oliveira, Marcus Vinícius Morais de; Ferraz, André Luiz Julien; Sterza, Fabiana de Andrade Melo

doi:10.1590/1678-4162-9494

Cited by 10 publications

(8 citation statements)

References 13 publications

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“…Thus, this information corroborates the dissimilarity found between the groups TC-60 and HS-60, showing that HS causes deleterious effects when there is exposure 60 days before OPU. These findings are in addition to those of Fialho et al, (33) , who found a reduction in the viability of cumulus oocyte complexes with exposure for 60 days in animals of Pantaneira breed.…”

Section: Discussionsupporting

confidence: 85%

Infuence of heat stress on in vitro oocyte and embryo production in high-yielding Holstein cows

Berling

Castro²,

Oliveira

2022

Ciênc. anim. bras.

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The objective of this study was to evaluate the influence of thermal shock on oocytes used in the production of in vitro embryos (IVP) of high productivity Holstein cows on the day of follicular aspiration (OPU; 0), 30, 60 and 90 days before the OPU. From the mean temperature on day 0 and on the previous 30, 60 and 90 days, they were classifed into comfort group (TC; up to 15°C) and heat stress (HS; above 15°C) groups.Anegative influence was observed on oocytes and viable embryos (total and grade I). The heat stress in the periods of 30 and 60 days prior to OPU resulted in lower production of viable oocytes (P=0.0028; P=0.0092, respectively). Under stress, on the day of OPU (HS-OPU), cows showed no reduction in the amount of viable oocytes (P=0.5497) and there was no influence of temperature for the group stressed 90 days before OPU (P=0.8287). For total embryos, the difference occurred only in the HS-30 group (P=0.0317), where the groups HS-OPU, HS-60, HS-90 presented, respectively, P=0. 1987, P=0.0596 and P=0.4580. Regarding the production of embryos of grade 1, there was no difference for the groups HS-OPU (P=0.2291) and HS-90 (P=0.2868), but there was a reduction for HS-30 (P=0.0143) and HS-60 (P=0.0253). In summary, heat stress had a negative impact when it occurred 30 or 60 days before follicular aspiration. In addition, 30 days seems to be the period of more susceptibility and that causes the greatest deleterious effects on oocyte viability and IVP.

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Section: Discussionsupporting

confidence: 85%

Infuence of heat stress on in vitro oocyte and embryo production in high-yielding Holstein cows

Berling

Castro²,

Oliveira

2022

Ciênc. anim. bras.

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“…Nevertheless, our results were similar to those found in another study, who worked with grazing ¾ Holstein × Gyr cows [66]. Additionally, the viable oocytes per oocytes recovered we observed is in agreement with results obtained in environmental conditions of THI between 69 and 72 for crossbred Holstein × Gyr animals in grazing conditions [67], (S2 Table). Hyperthermia can directly affect follicle function, leading to changes in follicular development, dominance, steroidogenesis, and gonadotropin secretion [68], indicating that the climatic conditions of the experiment may have influenced the low oocyte quality.…”

Section: Plos Onesupporting

confidence: 92%

Effect of protein supplement level on the productive and reproductive parameters of replacement heifers managed in intensive grazing systems

Machado

Guimarães

et al. 2020

PLoS ONE

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Evaluations of replacement heifers in intensively managed grazing systems in tropical conditions are warranted. Thus, we aimed to evaluate performance, muscle and mammary gland development, oocyte quality, and in vitro production of embryos of crossbred heifers grazing an intensively managed pasture and supplemented with high or low protein concentrates. Eighteen pubertal crossbred heifers (Holstein x Gyr) with an initial weight of 350 ± 8.0 kg were used in a 60-day trial. Two supplement types, 12% crude protein (CP) (S12CP) or 24% CP (S24CP), and a control treatment (mineral mixture, CON) were randomly distributed to the heifers. Throughout the experiment, four digestibility trials were performed over four consecutive days. Four ovarium pickups were performed to evaluate oocyte quality and in vitro embryo production. Lastly, ultrasounds of carcasses and mammary glands were performed. The intakes of dry matter (DM), digestible energy (DE), and CP were greater for supplemented (SUP) compared with CON heifers. The SUP heifers had a greater average daily gain (ADG) (645 versus 390 g/d) and rib eye area (58.78 versus 53.32 cm 2) than the CON heifers. Oocyte recovery, quality, and follicle features were not affected by supplementation strategy. However, the cleavage rate (47.17% versus 30.31%) and blastocyst rate (27.91% versus 10.12%) were negatively affected by supplementation. The S12CP presented a blastocyst rate much lower than the S24CP (3.02% versus 17.23%). Carcass ultrasonography indicated a trend for greater rib eye area for S24CP and mammary ultrasonography indicated no effects of supplementation on mammary gland development. In summary, supplementation seems to be an appropriate strategy for satisfactory performance, with greater muscle deposition and no negative impacts on mammary gland development. However, in vitro embryo production was impaired when the animals received the supplementation with 12% CP.

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“…A elevada temperatura que um embrião for exposto pode gerar alterações no seu desenvolvimento e até a morte. Quando a fêmea passa por estresse no dia da concepção e/ou até sete dias após concepção, pode ocorrer maiores índices nas falhas de desenvolvimento e menores taxas de sobrevivência embrionária (Costa et al, 2015;Fialho et al, 2018). Já quando sofrido pela fêmea durante a gestação, leva a uma redistribuição do sangue para a periferia corpórea, ocasiona redução da perfusão placentária, podendo causar efeitos negativos no crescimento fetal, nos pesos placentários e nas concentrações de hormônios placentários circulantes (Costa et al, 2016).…”

Section: Estresse Térmico Nos Animaisunclassified

Sistemas integrados de produção agropecuária e os efeitos do componente animal

Anjos

Pazdiora

Andrade

et al. 2021

RSD

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Grande parte do rebanho de bovinos do Brasil se encontra em sistemas a pasto em áreas intertropicais, como a Amazônia. Visto a necessidade de buscar maior sustentabilidade ambiental e econômica da pecuária, este trabalho teve como objetivo discutir a introdução e os benefícios do componente animal em sistemas integrados de produção agropecuária. A revisão baseou-se no referencial da pesquisa bibliográfica coletados através do levantamento das produções científicas sobre sistemas integrados de produção agropecuária (SIPA), produzidas entre os anos de 2000 a 2020. Os SIPAs consistem na implantação de diferentes atividades (pecuária, agricultura e silvicultura) na mesma área, em consórcio, sequencial ou rotacionado, manejados com ênfase no contexto de produção e sustentabilidade. A inclusão do componente animal traz diversos benefícios para o sistema, seja pelo estímulo à produção de biomassa, aumento da ciclagem de nutrientes, aumento da massa e diversidade microbiana, melhoria nas condições físicas, químicas e da fertilidade do solo. Além de beneficiar o sistema, o componente animal se beneficia com a inclusão, especialmente pelos melhores valores nutricionais das forrageiras e conforto térmico oferecido por alguns arranjos. Outro fator benéfico dos sistemas integrados para a pecuária, seria a sua utilização em métodos alternativos na recuperação e renovação de pastagens em áreas degradadas. Diversas são as modalidades/arranjos que podem ser empregados na integração, em que são montados visando aproveitar as sinergias existentes entre as atividades, as quais, possuem seus benefícios particulares ou mútuos quando bem conduzidos.

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Efeito do estresse térmico calórico agudo e crônico sobre a qualidade oocitária de bovinos de raças adaptadas

Cited by 10 publications

References 13 publications

Infuence of heat stress on in vitro oocyte and embryo production in high-yielding Holstein cows

Infuence of heat stress on in vitro oocyte and embryo production in high-yielding Holstein cows

Effect of protein supplement level on the productive and reproductive parameters of replacement heifers managed in intensive grazing systems

Sistemas integrados de produção agropecuária e os efeitos do componente animal

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