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- W2162362753 abstract "In dairy cows inseminated during the hot months of the year, there is a decrease in fertility. Different factors contribute to this situation; the most important are a consequence of increased temperature and humidity that result in a decreased expression of overt estrus and a reduction in appetite and dry matter intake. Heat stress reduces the degree of dominance of the selected follicle and this can be seen as reduced steroidogenic capacity of its theca and granulosa cells and a fall in blood estradiol concentrations. Plasma progesterone levels can be increased or decreased depending on whether the heat stress is acute or chronic, and on the metabolic state of the animal. These endocrine changes reduce follicular activity and alter the ovulatory mechanism, leading to a decrease in oocyte and embryo quality. The uterine environment is also modified, reducing the likelihood of embryo implantation. Appetite and dry matter intake are both reduced by heat stress thus prolonging the postpartum period of negative energy balance and increasing the calving-conception interval, particularly in high producing dairy cows. The utilization of cooling systems may have a beneficial effect on fertility but dairy cows cooled in this way are still unable to match the fertility achieved in winter. Recent studies suggest that the use of gonadotropins to induce follicular development and ovulation can decrease the severity of seasonal postpartum infertility in dairy cows." @default.
- W2162362753 created "2016-06-24" @default.
- W2162362753 creator A5024089042 @default.
- W2162362753 creator A5082305044 @default.
- W2162362753 date "2003-10-01" @default.
- W2162362753 modified "2023-10-05" @default.
- W2162362753 title "Heat stress and seasonal effects on reproduction in the dairy cow—a review" @default.
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- W2162362753 doi "https://doi.org/10.1016/s0093-691x(03)00126-2" @default.
- W2162362753 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/12935853" @default.
- W2162362753 hasPublicationYear "2003" @default.
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