Shading effect on physiological parameters and in vitro embryo production of tropical adapted Nellore heifers in integrated crop-livestock-forest systems

Silva, Wilian Aparecido Leite da; Poehland, Ralf; Oliveira, Caroline Carvalho de; Ferreira, M. G. C. R.; Almeida, R. G. de; Cáceres, Mirela Brochado Souza; Macedo, Gustavo Guerino; Silva, Eliane Vianna da Costa e; Alves, F. V.; Nogueira, É.; Sterza, Fabiana de Andrade Melo

doi:10.1007/s11250-020-02244-3

Cited by 15 publications

(12 citation statements)

References 31 publications

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“…However, specific mechanisms of subsequent laboratory steps should be studied to elucidate the equivalent blastocyst rates on D7 from cows raised on shaded or unshaded pastures (42.9 vs 35.9%). This was in contrast to previous results in which an increase in the rate of blastocysts was observed in Nellore heifers raised in the SP system 45 . However, during the summer, lower numbers of total oocytes, viable oocytes, recovery rate, cleaved structures, cleavage rate, and blastocysts on day 7 were observed, evidencing the deleterious effect of warmer seasons on fertility, as previously reported 45 , 46 .…”

Section: Discussioncontrasting

confidence: 99%

Silvopastoral system is an alternative to improve animal welfare and productive performance in meat production systems

Lemes

Garcia

Pezzopane

et al. 2021

Sci Rep

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Climate change is a reality and global surface temperature is projected to rise substantially in the next 80 years. Agriculture practices will have to adapt to climate change, and also help to mitigate this effect using, among other strategies, forest conservation and management. Silvopastoral systems have been adopted in tropical climate livestock areas but their benefits on thermal comfort and reproductive performance of beef cows are not completely known. Therefore, our aims were to compare the microclimate of silvopastoral and intensive rotational unshaded grazing systems in different months and to evaluate physiological variables (Exp. 1 and 2), metabolism, and in vitro embryo production (Exp. 2) in crossbred beef females. Our hypothesis is that the silvopastoral system can improve the thermal comfort of beef heifers and cows and, consequently, also improve dry matter intake, body weight gain, and in vitro embryo production when compared to the unshaded rotational grazing system. In Exp 1, the silvopastoral system decreased body temperature and increased welfare and performance of heifers. In Exp. 2, the silvopastoral system enhanced the body weight but did not affect metabolism and the general reproductive performance, but increased the recovery rate of oocytes in primiparous cows.

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Section: Discussioncontrasting

confidence: 99%

Silvopastoral system is an alternative to improve animal welfare and productive performance in meat production systems

Lemes

Garcia

Pezzopane

et al. 2021

Sci Rep

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“…Our research group demonstrated some examples of how biological systems react to the adaptation process. For example, we showed that different tropical breeds [ 92 ] respond differently to the “stress” they are subjected to, especially under different housing conditions [ 93 ]. Additionally, the duration and intensity of in vitro thermal stress [ 94 ] exhibited an interesting pattern of oocyte and embryo development after maturation under cold and high temperatures.…”

Section: Heat Stressmentioning

confidence: 99%

Lipid Metabolism in Bovine Oocytes and Early Embryos under In Vivo, In Vitro, and Stress Conditions

Sterza

Poehland

2021

IJMS

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Lipids are a potential reservoir of energy for initial embryonic development before activation of the embryonic genome and are involved in plasma membrane biosynthesis. Excessive lipid droplet formation is detrimental to cryotolerance and is related to alterations in mitochondrial function, which likely affects lipid metabolism. Increased lipid accumulation in in vitro produced embryos is a consequence of the stress during in vitro embryonic development process. There are several open questions concerning embryo lipid metabolism and developmental potential. Oocyte maturation and embryo development in vivo and in vitro may vary if the donors are subjected to any type of stress before follicle puncture because crucial changes in oocyte/embryonic metabolism occur in response to stress. However, little is known about lipid metabolism under additional stress (such as heat stress). Therefore, in this review, we aimed to update the information regarding the energy metabolism of oocytes and early bovine embryos exhibiting developmental competence, focusing on lipid metabolic pathways observed under in vivo, in vitro, and stress conditions.

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“…Therefore, reproductive biotechnologies are generally not performed in beef cattle during hot months. One alternative might be to use frozen embryos, as demonstrated for dairy cattle [ 177 ] or to use breeds more resistant to heat stress, such as Nellore [ 178 ].…”

Section: Beef Cattle Stress and Reproductive Biotechnologiesmentioning

confidence: 99%

The Effect of Stress on Reproduction and Reproductive Technologies in Beef Cattle—A Review

Fernández-Novo¹,

Pérez-Garnelo

Villagrá

et al. 2020

Animals

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Researchers have contributed by increasing our understanding of the factors affecting reproduction in beef, mainly physical health and nutrition aspects, which have been main concerns during decades. Animal welfare is of outmost relevance in all animal production systems and it is strongly associated to stress. Stress responses involve endocrine, paracrine and neural systems and the consequences of this stress on the reproductive efficiency of specifically, beef cattle and bulls, need to be highlighted. We, therefore, describe the fundamentals of stress and its quantification, focusing in beef herds, reviewing the highly valuable pieces of research, already implemented in this field. We examine major factors (stressors) contributing to stress in beef cattle and their effects on the animals, their reproductive performance and the success of reproductive biotechnologies. We include terms such as acclimatization, acclimation or temperament, very relevant in beef systems. We examine specifically the management stress due to handling, social environment and hierarchy or weaning effects; nutritional stress; and thermal stress (not only heat stress) and also review the influence of these stressors on reproductive performance and effectiveness of reproductive biotechnologies in beef herds. A final message on the attention that should be devoted to these factors is highlighted.

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Shading effect on physiological parameters and in vitro embryo production of tropical adapted Nellore heifers in integrated crop-livestock-forest systems

Cited by 15 publications

References 31 publications

Silvopastoral system is an alternative to improve animal welfare and productive performance in meat production systems

Silvopastoral system is an alternative to improve animal welfare and productive performance in meat production systems

Lipid Metabolism in Bovine Oocytes and Early Embryos under In Vivo, In Vitro, and Stress Conditions

The Effect of Stress on Reproduction and Reproductive Technologies in Beef Cattle—A Review

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