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the first time she gets a good dose of colostrum, which contains antibodies from the ewes immune system and absorbed through the lamb's intestines for around the first 24 hours of life. This colostrum protects the lamb for about 10 weeks. Once it has reached the age of 10 weeks it should receive its own vaccination, however it is better to give a priming dose at 9 or 10 weeks followed by a booster about a month later.