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无效奶头(Uneffective teat)是指发育不完善,泌乳期无排乳能力的乳头,包括瞎奶头、翻奶头(火山奶头)、连奶头、副奶头等。瞎奶头:乳管发育不全或堵塞,乳汁不能排出的奶头,是严重损征。翻奶头:乳管倒生,乳头端呈漏斗状凹陷,奶头短,弹性小,仔猪难以吮含。连奶头:最后一对或对半奶头连生于同一基部上,...