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Avaliação de Técnicas e Práticas de Indução do Cio em Porcas Nulíparas
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Abstract(s)
O rendimento no primeiro ciclo está muito relacionado com o rendimento global da porca, contudo, nas nulíparas, por terem cios mais curtos e irregulares, existe uma maior dificuldade na deteção do cio, maiores dificuldades na inseminação e sobretudo na expressão do próprio cio. De forma a adiantar o estro podem ser utilizados vários métodos/práticas de indução do mesmo, nomeadamente exposição ao macho, flushing alimentar, uso de suplementos alimentares, administração de progestagénios, administração de gonadotrofinas (eCG e hCG) e administração agentes luteolíticos. O presente estudo comparou diferentes técnicas de indução, nomeadamente o uso de farinha de peixe como suplemento alimentar, administração de gonadotrofinas (PG600) e a administração de um agente luteolítico (PGF2) em dois grupos de diferentes idades (Grupo 1 = 234,5±3,9 dias; Grupo 2 = 183,8±4,7 dias). Neste estudo, o uso de PG600 induziu rapidamente o cio ao fim de 3,8 ± 0,27 dias da sua administração, sem comprometer parâmetros reprodutivos como taxa de fertilidade, prolificidade e mortalidade dos nascidos por ninhada. A farinha de peixe também obteve bons resultados com uma indução ao fim de 6,8 ± 0,9 dias. O uso de PGF2 não mostrou um bom desempenho como método de indução do cio (16.3±5.7 dias).
The reproductive performance in the first cycle is closely related to the overall reproductive performance of the sow, however, the gilt, due to their shorter and more irregular heat, there is greater difficulty in detecting heat, greater difficulties in insemination and above all in expressing of heat. In order to advance estrus, several methods/practices can be used to induce estrus, including exposure to the male, flushing, use of food supplements, administration of progestogens, administration of a combination of gonadotropins (eCG and hCG) and administration of agents luteolytics. The present study compared different induction techniques, namely the use of fishmeal as a feed supplement, administration of gonadotropins (PG000) and administration of a luteolytic agent (PGF2) in two different age groups (Group 1 = 234,5± 3,9 days; Group 2 = 183,8 ± 4,7 days). In this study, the use of PG600 induced estrus after 3,8 ± 0,27 days of its administration, without compromising reproductive parameters such as fertility rate, prolificacy and mortality of piglets born after birth. Fishmeal also had good results with an induction after 6.8 ± 0.9 days. The use of PGF2 did not show a good performance as an estrus induction method (16.3±5.7 days).
The reproductive performance in the first cycle is closely related to the overall reproductive performance of the sow, however, the gilt, due to their shorter and more irregular heat, there is greater difficulty in detecting heat, greater difficulties in insemination and above all in expressing of heat. In order to advance estrus, several methods/practices can be used to induce estrus, including exposure to the male, flushing, use of food supplements, administration of progestogens, administration of a combination of gonadotropins (eCG and hCG) and administration of agents luteolytics. The present study compared different induction techniques, namely the use of fishmeal as a feed supplement, administration of gonadotropins (PG000) and administration of a luteolytic agent (PGF2) in two different age groups (Group 1 = 234,5± 3,9 days; Group 2 = 183,8 ± 4,7 days). In this study, the use of PG600 induced estrus after 3,8 ± 0,27 days of its administration, without compromising reproductive parameters such as fertility rate, prolificacy and mortality of piglets born after birth. Fishmeal also had good results with an induction after 6.8 ± 0.9 days. The use of PGF2 did not show a good performance as an estrus induction method (16.3±5.7 days).
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Keywords
nulíparas indução gonadotrofinas agentes luteolíticos farinha de peixe