科研之友
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摘要
O trabalho teve por objetivo avaliar a taxa de transfer那ncia de imunidade passiva e de reten o de placenta com a utiliza o pr谷via de um glicocorticoide de longa a o na indu o do parto bovino aos 270 dias de gesta o, bem como verificar a efic芍cia dos protocolos. Foram utilizadas 42 vacas prenhes, de corte e de leite, leatoriamente separadas em tr那s grupos: Grupo-controle (C) que n o recebeu aplica o hormonal, mas o mesmo manejo; Grupo longa a o + indu o (LA) que recebeu 30 mg de acetato de metilprednisolona, via subcutanea, no dia 255 de gesta o e 20 mg de dexametasona associada a 0,5 mg de cloprostenol s車dico, via intramuscular, no dia 270 de gesta o; e Grupo indu o (I) que recebeu 20 mg de dexametasona associada a 0,5 mg de cloprostenol s車dico no dia 270 de gesta o. A utiliza o pr谷via do glicocorticoide de longa a o n o mostrou diferen a na taxa de transfer那ncia de imunidade passiva e nos 赤ndices de reten o de placenta. As f那meas dos Grupos LA e I pariram em 41,36 ㊣ 1,89h ap車s a aplica o hormonal de dexametasona associada ao cloprostenol, independente de aplica o pr谷via de glicocorticoide de longa a o no Grupo LA. A indu o da pari o com dexametasonaassociada ao cloprostenol, independente da aplica o pr谷via de acetato de metilprednisolona, mostrou-se eficaz em todos dos animais. This experiment had the objective of evaluating passive immunity transfer and placental retention rates with the early use of a long-acting glucocorticoid to induce bovine parturition at 270 pregnancy days, as well as comparing protocol efficacy regarding the timing of parturition induction. Fortytwo pregnant cows were selected from a beef and dairy herd and randomly assigned into one of three groups: control (C) without drug injection, but with the same management; long-acting + induction group (LA), with one injection of 30 mg prednisolone methylacetate, subcutaneous, on pregnancy day 255 and another injection of 20 mg dexamethasone plus 0.5 mg cloprostenol, intramuscular, on pregnancy day 270; induction group (I), with 20 mg dexamethasone plus 0.5 mg cloprostenol on pregnancy day 270. The early administration of long-acting glucocorticoid did not have any difference on passive immunity transfer and placental retention. Cows from groups LA and I calved in 41.36 ㊣ 1.89 hours post-injection of 20 mg dexamethasone plus 0.5 mg cloprostenol, regardless of previous long-acting glucocorticoid administration on the LA group. Induction of parturition using dexamethasone and cloprostenol was efficient in all cows, regardless of previous prednisolone methylacetate ad
