Boivin R, Bost J
Ann Rech Vet. 1977;8(2):143-52.
The salivary elimination of ammonia and urea was studied in 4 permanently salivary duct fistulated sheep. Sheep were fed either a regular diet or the same diet with addition of non protein nitrogen (NPN). Individual saliva ammonia levels vary from 34 to 71 microgram N/100 ml. After intra-ruminal dosing with urea (10 g) or ammonia (2 g), the values may rise up to 1000 microgram N/100 ml. Saliva ammonia and blood ammonia changes follow the same direction. Daily saliva urea variations are correlated with feeding behaviour. NPN administration increases saliva urea and blood urea; both concentration curves are parallel.
在4只永久性唾液腺导管造瘘的绵羊中研究了唾液对氨和尿素的排泄情况。给绵羊喂食常规日粮或添加非蛋白氮（NPN）的相同日粮。个体唾液氨水平在34至71微克氮/100毫升之间变化。瘤胃内注射尿素（10克）或氨（2克）后，数值可能升至1000微克氮/100毫升。唾液氨和血氨变化方向相同。每日唾液尿素变化与采食行为相关。给予NPN会增加唾液尿素和血尿素；两者的浓度曲线平行。
