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Orientador(es)
Resumo(s)
O setor do leite atravessa uma grande crise na Europa devido nomeadamente ao fim das quotas leiteiras, à redução de importações, abrandamento do crescimento da economia chinesa. Em Portugal, apesar de excedentário na produção leiteira em natureza, o país importou vários milhões de euros em produtos lácteos. Os excedentes de produção estão relacionados com a diminuição do consumo per capita de leite em natureza que se tem observado nos últimos anos. De forma a ultrapassar algumas dificuldades, deverão ser adotadas várias medidas entre as quais, a melhoria dos parâmetros reprodutivos. Com este intuito, realizou-se o presente estudo, de modo a verificar se a introdução de um protocolo que permitisse a re-inseminação precoce a tempo fixo, seria vantajosa para a exploração. Para o estudo foram avaliadas 83 vacas do ano em que realizaram a inseminação artificial apenas quando detetadas em cio e 86 vacas do ano em que foi introduzido o protocolo de ressincronização da ovulação. Quando calculadas as medianas, registou-se uma diminuição de 45 para 17,5 dias abertos, verificando-se uma melhoria dos parâmetros reprodutivos. Após a aplicação da metodologia do orçamento parcial de substituição, constatou-se que a utilização do protocolo de ressincronização foi vantajosa para a exploração também a nível económico, tendo se obtido como benefício líquido de substituição um valor de 249,14€/vaca.
ABSTRACT - Retrospetive study of reproductive indexes in Holstein Friesian cows: preliminary study of the use of a protocol for ovulation re-synchronization - The milk sector is undergoing a major crisis in Europe due namely to the end of milk quotas, reducing imports and the slower growth of the Chinese economy. Despite a surplus in dairy production, Portugal imported several million euros in dairy products. The production surpluses are related with the decrease in milk consumption per capita that has been observed in the previous years. In order to overcome certain difficulties, several measures must be adopted, including the improvement of reproductive parameters. To achieve this purpose, the present study was carried out in order to verify if the introduction of a protocol that allows a fixed time artificial re-insemination would be advantageous for the dairy farm. In the present study, 83 cows were evaluated regarding the year in which the artificial insemination was performed only due to detection of oestrus, and another 86 cows were evaluated regarding the year of the introduction of the ovulation re-synchronization protocol. When the medians were calculated, a decrease in the open days, from 45 to 17,5, was observed and was also attested an improvement in the reproductive parameters. After applying the methodology of the partial analysis budget, it was found that the application of the re-synchronization protocol was advantageous for the dairy farm, not only in terms of open days, but also economically, and a net benefit of substitution of 249,14 € per cow was obtained.
ABSTRACT - Retrospetive study of reproductive indexes in Holstein Friesian cows: preliminary study of the use of a protocol for ovulation re-synchronization - The milk sector is undergoing a major crisis in Europe due namely to the end of milk quotas, reducing imports and the slower growth of the Chinese economy. Despite a surplus in dairy production, Portugal imported several million euros in dairy products. The production surpluses are related with the decrease in milk consumption per capita that has been observed in the previous years. In order to overcome certain difficulties, several measures must be adopted, including the improvement of reproductive parameters. To achieve this purpose, the present study was carried out in order to verify if the introduction of a protocol that allows a fixed time artificial re-insemination would be advantageous for the dairy farm. In the present study, 83 cows were evaluated regarding the year in which the artificial insemination was performed only due to detection of oestrus, and another 86 cows were evaluated regarding the year of the introduction of the ovulation re-synchronization protocol. When the medians were calculated, a decrease in the open days, from 45 to 17,5, was observed and was also attested an improvement in the reproductive parameters. After applying the methodology of the partial analysis budget, it was found that the application of the re-synchronization protocol was advantageous for the dairy farm, not only in terms of open days, but also economically, and a net benefit of substitution of 249,14 € per cow was obtained.
Descrição
Dissertação de Mestrado Integrado em Medicina Veterinária
Palavras-chave
Bovinos Frísia Holstein Inseminação artificial Ressincronização de ovulação Parâmetros reprodutivos Cattle Holstein Friesian artificial insemination synchronization of oestrus reproductive parameters
Contexto Educativo
Citação
Ribeiro, M.M.R.C. (2018). Estudo retrospetivo de índices reprodutivos em vacas frísias Holstein : análise preliminar da utilização de um protocolo de ressincronização de ovulação. Dissertação de mestrado. Universidade de Lisboa, Faculdade de Medicina Veterinária, Lisboa.
Editora
Universidade de Lisboa, Faculdade de Medicina Veterinária
