Shading effect on physiological parameters and in vitro embryo production of tropical adapted Nellore heifers in integrated crop-livestock-forest systems.
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ID: 99446
2020
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Abstract
The aim of this study was to evaluate the impact of increased shadow supply in integrated crop-livestock-forest systems on in vitro embryonic development and physiological parameters related to stress response in Nellore heifers (Bos indicus). For the study, animals (n = 16) were randomly divided into two groups and kept in areas with different afforestation systems, the integrated crop-livestock-forest (ICLF) and the integrated crop-livestock (ICL) system. The microclimate of the ICLF system provided better comfort conditions than ICL. No differences of respiratory rate, rectal temperature, cortisol, T3, T4, oocyte quality, and cleavage rate between the systems were verified. A higher blastocyst rate was observed in the ICLF (p < 0.05). The results demonstrate that Nellore heifers managed in ICLF during summer in Midwest of Brazil showed higher production of in vitro embryos, without typical changes in its physiological parameters. The results observed in the present study indicate that zebu females are able to respond satisfactorily to the intense heat conditions; however, we believe that the long period to which these animals are exposed to these conditions interferes in the oocyte competence and embryo development.
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| Reference Key |
leite-da-silva2020shadingtropical
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|---|---|
| Authors | Leite da Silva, Wilian Aparecido;Poehland, Ralf;Carvalho de Oliveira, Caroline;Ribeiro Ferreira, Mariane Gabriela Cesar;Garcia de Almeida, Ricardo;Cáceres, Mirela Brochado Souza;Macedo, Gustavo Guerino;da Costa E Silva, Eliane Vianna;Alves, Fabiana Villa;Nogueira, Eriklis;de Andrade Melo-Sterza, Fabiana; |
| Journal | Tropical animal health and production |
| Year | 2020 |
| DOI |
10.1007/s11250-020-02244-3
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| URL | |
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