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Etiopatogenia E Tratamento Dos Quistos Ováricos Nas Vacas Leiteiras
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Advisor(s)
Abstract(s)
Os quistos ováricos são uma das principais patologias que afetam a fertilidade dos bovinos leiteiros devido aos seus efeitos limitantes na performance reprodutiva, causando grandes perdas económicas. Embora ao longo do tempo tenham sido propostas algumas definições que descrevem os quistos ováricos, persiste a falta de consenso e não existe uma definição clara da doença. Quanto ao mecanismo de formação dos quistos ováricos, a disfunção ao nível do eixo hipotálamo-hipófise-ovário responsável pela ausência ou atraso da ovulação, é o mais consensual. No entanto, as etiologias são múltiplas e apesar de numerosos estudos, o mecanismo pelo qual os quistos se formam ainda não é totalmente compreendido. Do ponto de vista económico, a decisão de tratar um quisto ovárico implica ponderar vários fatores, como os custos do tratamento, os custos de substituição e o valor reprodutivo do animal. Presentemente, os tratamentos mais utilizados são os hormonais. No entanto, a utilização excessiva de hormonas na produção leiteira ou o desenvolvimento de resistência às hormonas preocupam os consumidores e os criadores. Por isso, novas terapias como a acupunctura ou o transplante de células estaminais estão a ser desenvolvidas.
Ovarian cysts are one of the main factors affecting the fertility of dairy cattle due to their negative effects on reproductive performance, causing major economic losses. Although some definitions describing ovarian cysts have been proposed over time, there is still a lack of consensus and no clear definition of the disease. The most widely accepted mechanism for the formation of ovarian cysts is a dysfunction of the hypothalamic-pituitary-ovarian axis causing the absence or delay of ovulation. Nevertheless, the etiologies are multiples and despite numerous studies, the mechanism by which cysts develop is still not fully understood. From an economic point of view, the decision to treat an ovarian cyst involves taking into account various factors such as treatment costs, replacement costs, and the reproductive value of the animal. Presently, the hormonal treatments are the most commonly used. However, the excessive use of hormones in dairy production or the development of resistance to hormones seems to be worrying consumers and breeders. For this reason, new therapies such as acupuncture or stem cell transplants are being developed.
Ovarian cysts are one of the main factors affecting the fertility of dairy cattle due to their negative effects on reproductive performance, causing major economic losses. Although some definitions describing ovarian cysts have been proposed over time, there is still a lack of consensus and no clear definition of the disease. The most widely accepted mechanism for the formation of ovarian cysts is a dysfunction of the hypothalamic-pituitary-ovarian axis causing the absence or delay of ovulation. Nevertheless, the etiologies are multiples and despite numerous studies, the mechanism by which cysts develop is still not fully understood. From an economic point of view, the decision to treat an ovarian cyst involves taking into account various factors such as treatment costs, replacement costs, and the reproductive value of the animal. Presently, the hormonal treatments are the most commonly used. However, the excessive use of hormones in dairy production or the development of resistance to hormones seems to be worrying consumers and breeders. For this reason, new therapies such as acupuncture or stem cell transplants are being developed.
Description
Keywords
Distúrbio Reprodutivo Hormonas Fertilidade Bovinos Leiteiros Dairy Cattle Fertility Hormones Reproductive Failure