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• W1585574484 endingPage "410" @default.
• W1585574484 startingPage "399" @default.
• W1585574484 abstract "Resumen Ante la sospecha de que la formacion de radicales libres en el organismo animal pueda influir negativamente en la reproduccion y ser una de las multiples causas del descenso de la eficacia reproductiva observada en los ultimos anos en el ganado vacuno lechero, nos hemos propuesto en este articulo hacer una amplia revision de los posibles efectos beneficiosos sobre la reproduccion de dos antioxidantes, la vitamina A y su precursor el β-caroteno, con el fin de valorar sus posibilidades terapeuticas frente a este importante problema. Tras la revision, podemos concluir que en los procesos reproductivos del animal se generan numerosos radicales libres que pueden danar las celulas del aparato reproductor, incluidos los gametos y el embrion, provocando, entre otros, fallos en la maduracion del ovocito y en el desarrollo temprano del embrion, que derivan en un fallo reproductivo. Sin embargo, el organismo mantiene, en condiciones normales, un equilibrio entre los radicales libres y los antioxidantes que previene la aparicion de estos problemas. Cuando este equilibrio se rompe, consecuencia de bajos niveles de antioxidantes en la dieta, incremento de las demandas por estres por calor, por elevada produccion o por determinados tratamientos que aumentan la actividad de los organos reproductivos (superovulacion), es cuando surgen los problemas y puede ser necesaria la suplementacion exogena con antioxidantes. Palabras clave: Antioxidantes, vaca, reproduccion. Summary Role of β-carotene and A vitamin in bovine reproduction: a review Faced with the suspect free radicals formation in animal organism can have a negative influence in bovine reproduction and be one of the multiple causes of dairy cattle reproductive efficiency decrease in last years, in this study we make an extensive literature review about possible good effects of two antioxidants, vitamin A and its precursor s-carotene, on cattle reproduction with the aim of analyse its therapeutic possibilities. In accordance with the study results, we observe that in reproductive processes there is an important free radicals formation that may damage reproductive system cells, including gametes and embryos, it causes some effects like failures in oocyte maturation process and early embryo growth, that move on to a reproductive failure. Nevertheless, under normal conditions, animal organism keeps balance between free radicals and antioxidants. This balance prevents reproductive problems occurrence, therefore when it is broken, as a result of low antioxidants levels in diet, increase on its demand on heat-stress, elevated rate of free radicals production or several treatments that increases reproductive organs activity (superovulation); in all this cases reproductive problems appear and it may be necessary exogenous antioxidants supplementation." @default.
• W1585574484 created "2016-06-24" @default.
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• W1585574484 date "2008-01-01" @default.
• W1585574484 modified "2023-09-27" @default.
• W1585574484 title "Papel del Beta-caroteno y la vitamina A en la reproducción en el ganado vacuno: revisión" @default.
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