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In this study, we evaluated the modulation effect of long-chain Acyl-CoA synthetase during early embryo development. Bovine embryos were cultured in four groups: positive modulation (ACS+) with GW3965 hydrochloride, negative modulation (ACS-) with Triacsin C, association of both modulators (ACS±), and control. Embryo development rates were not altered (P>0.05) by treatments. Embryonic cytoplasmic lipid content increased in ACS+ but reduced in ACS- compared to the control (P < 0.05), whereas the membrane phospholipids profile was not altered by treatments. The total number of blastomeres did not differ (P > 0.05) between groups; however, an increased apoptotic cells percentage was found in ACS- compared to control. Twenty-four hours after warming, ACS+ and control grade I embryos presented the best hatching rates, whereas the ACS+ group equaled the hatching rates between their embryos of grades I, II and III 48 hours after warming. The relative abundance of transcripts for genes associated with lipid metabolism (ACSL3, ACSL6, ACAT1, SCD, and AUH), heatshock (HSP90AA1 and HSF1), oxidative stress (GPX4), and angiogenesis (VEGF), among other important genes for embryo development were affected by at least one of the treatments. The treatments were effective in modulating the level of transcripts for ACSL3 and the cytoplasmic lipid content. The ACS- was not effective in increasing embryonic cryosurvival, whereas ACS+ restored survival rates after vitrification of embryos with low quality, making them equivalent to embryos of excellent quality.

This study investigated the effectiveness of a bacteriostatic-coated blister in preserving swine semen quality and its impact on reproductive performance. Two experiments were conducted: an in vitro assessment of the blister’s bacteriostatic efficacy and semen quality during three days of storage (Experiment 1), and a seven-day commercial farm trial evaluating its effect on reproductive outcomes in artificially inseminated gilts and sows (Experiment 2). In Experiment 1, the bacteriostatic blister effectively controlled bacterial proliferation, maintaining counts below 2 log10, comparable to controls with added antibiotics. Sperm quality parameters, including total and progressive motility, consistently exceeded the critical threshold for artificial insemination. Experiment 2 demonstrated that the bacteriostatic coating did not negatively affect key reproductive performance indicators, such as farrowing rate, total piglets born, or live piglets under commercial conditions. These findings suggest that the bacteriostatic-coated blister offers a viable, potentially antibiotic-free, alternative for semen preservation, extending storage viability for up to seven days. This technology supports sustainable reproductive practices, representing a significant advancement in commercial swine production.

The female reproductive function is coordinated by the endocrine system driven by the hypothalamic-pituitary-gonadal (HPG) axis. While not directly part of the female reproductive system, the gut microbiome plays a crucial role in overall health, including reproductive health. The gut microbiome communicates bidirectionally with the brain via the gut-brain axis, influencing stress levels, mood, and hormonal balance, which can impact reproductive health and fertility. In addition to that, the vaginal and uterine microbiome are directly involved with the reproductive success of farm animals, including female fertility and offspring development. In this paper, we summarize some of the effects of bacterial contamination in the female reproductive tract and their association with reproductive performance in farm animals.

Abstract The application of assisted reproductive techniques (ART) in both farm animals and humans has faced challenges since its inception. Advances in this field have largely depended on a deeper understanding of the metabolic requirements and molecular dynamics of sperm, oocytes, and embryonic development. Glucose, for instance, is commonly utilized as an energy source in in vitro procedures. The pentose phosphate pathway (PPP), a pathway parallel to glycolysis, plays a key role in redox regulation via NADPH generation and ribose biosynthesis. This review highlights the role of the PPP in reproductive cells and discusses its potential implications for ART procedures.

Global cattle genetic market is experiencing a change of strategy, large genetic companies, traditionally recognized in the artificial insemination field, have also begun to operate in the embryo market. Consequently, the demand for produced (IVP) embryos has grown. However, the overall efficiency of the biotechnology process remains low. Additionally, the lack of homogeneity of post-cryopreservation survival results of IVP embryos still impairing a massive dissemination of this biotechnology in the field. A great challenge for production labs is to increase the amount of embryos produced with exceptional quality after each round of fertilization. Herein, we discuss the molecular and cellular features associated with the competence and cryosurvival of IVP embryos. First, morphofunctional, cellular and molecular competence of the embryos were addressed and a relationship between embryo developmental ability and quality were established with cryosurvival and pregnancy success. Additionally, determinant factors of embryo competence and cryosurvival were discussed including the following effects: genotype, oocyte quality and follicular microenvironment, production conditions, and lipids and other determining molecules. Finally, embryo cryopreservation aspects were addressed and an embryo-focused approach to improve cryosurvival was presented.

Embryonic lipids are crucial for the formation of cellular membranes and dynamically participate in metabolic pathways. Cells can synthesize simple fatty acids, and the elongation of fatty acids facilitates the formation of complex lipids. The aim of this work was to investigate the involvement of the elongation of very long chain fatty acid enzyme 5 (ELOVL5) in embryonic development and lipid determination. Bovine embryos were produced in vitro using a standard protocol and randomly divided to receive one of three treatments at Day 4: morpholino (Mo) gene expression knockdown assay for ELOVL5 (ELOVL5-Mo), Mo antisense oligonucleotides for the thalassemic β-globulin human mRNA (technical control Mo), and placebo (biological control). The phenotypes of embryonic development, cell number, ELOVL5 protein abundance, lipid droplet deposits, and lipid fingerprint were investigated. No detrimental effects (p > 0.05) were observed on embryo development in terms of cleavage (59.4 ± 3.5%, 63.6 ± 4.1%, and 65.4 ± 2.2%), blastocyst production (31.3 ± 4.2%, 28.1 ± 4.9%, and 36.1 ± 2.1%), and blastocyst cell number (99.6 ± 7.7, 100.2 ± 6.2, 86.8 ± 5.6), respectively, for biological control, technical control Mo, and ELOVL5-Mo. ELOVL5 protein abundance and cytoplasmic lipid droplet deposition were increased (p < 0.05) in ELOVL5-Mo–derived blastocysts compared with the controls. However, seven lipid species, including phosphatidylcholines, phosphatidylethanolamines, and triacylglycerol, were downregulated in the ELOVL5-Mo–derived blastocysts compared with the biological control. Therefore, ELOVL5 is involved in the determination of embryonic lipid content and composition. Transient translational blockage of ELOVL5 reduced the expression of specific lipid species and promoted increased cytoplasmic lipid droplet deposition, but with no apparent deleterious effect on embryonic development and blastocyst cell number.

This study investigated the factors influencing gestation length in a herd of Wagyu cattle in Rio Grande do Sul, Brazil. Fifty-five multiparous purebred Wagyu cows underwent a Fixed-Time Artificial Insemination (FTAI) protocol using semen from a bull randomly selected from five bulls representing three distinct genetic lines. Following birth, we recorded the calves’ gender, weight, and gestation length. The ANOVA test was employed to assess genetic effects on calf weight and gestation length, with significance set at p < 0.05. The 55 inseminations resulted in 52 births, comprising 34 females and 18 males. The average calf weight was 25.9 kg, with 25.2 kg for females and 27.2 kg for males (p = 0.38). No significant effect was observed for birth weight concerning the sire’s genetic line (p = 0.42), although there was a trend towards an effect from the maternal grandfather (p = 0.09). The mean duration of pregnancy was 283.8 ± 5.91 days, with no significant effect of gender on gestation length (p = 0.6). However, when evaluating the genetic influences on gestation length, we observed significant effects from the sire’s genetic line (p < 0.0001) and the maternal grandfather (p < 0.0001). Notably, longer pregnancies resulted in heavier calves (p < 0.0001). This is the first study to identify the effects of Wagyu breed lines on pregnancy length.

The production of in vitro embryos has sped up the dissemination of superior genetic material. However, the variation among the cattle response to oocyte and embryo production is a challenging factor. This variation is even higher in the Wagyu cattle as the breed has a small effective population size. The identification of an effective marker related to reproductive efficiency would allow the selection of more responsive females to reproductive protocols. The objective of this study was to evaluate the blood levels of anti-Müllerian hormone and associate it with oocyte recovery and blastocyst rate of embryos produced in vitro in Wagyu cows, as well as observe the hormone circulating levels in males. Serum samples from 29 females with seven follicular aspirations and four bulls were used. AMH measurements were performed using the bovine AMH ELISA kit. A positive correlation was identified between oocyte production and blastocyst rate ( r = 0.84, P = 9 × 10 −9 ), and AMH levels with oocyte ( r = 0.49, P = 0.006) and embryo ( r = 0.39, P = 0.03) production. The mean levels of AMH were different between animals with low (11.06 ± 3.01) and high (20.75 ± 4.46) oocyte production ( P = 0.01). Males showed high serological levels of AMH (3829 ± 2328 pg/ml) compared with other breeds. It is possible to use the serological measurement of AMH as a method to select Wagyu females with greater capacity for oocyte and embryo production. Further studies correlating AMH serological levels with Sertoli cell function in bulls are needed.

Resumo Objetivo Discutir as relações de poder entre profissionais de saúde em ambientes de cuidado intensivo e sua interferência no processo de construção do conhecimento. Métodos Neste artigo filosófico, exploramos a influência das relações de poder na construção do conhecimento, a partir das perspectivas foucaultiana e crítica de Gramsci e Freire em relação às práticas de enfermagem e cuidados de saúde. Resultados Há quatro fontes de poder organizacional (tomada de decisão, critério, controle de recursos e controle de conhecimento/rede) que atuam em diferentes níveis das organizações de saúde. As unidades de terapia intensiva são um importante segmento do ambiente de saúde, e a complexidade no cotidiano dos profissionais desse setor pode dificultar as relações de poder no processo de construção do conhecimento. Por exemplo, quando profissionais externos à equipe da UTI, que detêm conhecimentos específicos, precisam ser contatados para auxiliar em casos, como durante o processo de doação e transplante de órgãos. Nesta situação, é necessário desconstruir o poder competitivo para construir o poder colaborativo. Conclusão Usando as perspectivas de Freire e Gramsci, argumentamos que a falta de conhecimento contribui para o poder competitivo, que pode ser superado se os indivíduos envolvidos participarem no processo de aprendizagem em direção ao poder colaborativo. Portanto, as estratégias ou ações para lidar com os desequilíbrios de poder interprofissional podem contribuir para a transformação e mudança mútua.