References
- Meads , WJ , Osborn , J and Grant , AB . 1980 . The effect of single doses of selenium salts on whole blood levels of selenium in ewes on a selenium-deficient diet . New Zealand Veterinary Journal , 28 : 20 – 22 .
- Thompson , KG , Fraser , AJ , Harrop , BM , Kirk , JA , Bullions , J and Cordes , DO . 1981 . Glutathione peroxidase activity and selenium concentration in bovine blood and liver as indicators of dietary selenium intake . New Zealand Veterinary Journal , 29 : 3 – 6 .
- Watkinson , JH . 1979 . Semi-automated fluorometric determination of nanogram quantities of selenium in biological materials . Analytical Chimica , 105 : 319 – 325 .
- Ellison , R S . 1992 . “ A review of copper and selenium reference ranges in cattle and sheep, Trace elements in ruminants ” . In Proceedings of the 22nd Seminar of the Sheep and Beef Cattle Society of the New Zealand Veterinary Association, Rotorua 3 – 27 .
- Grace , N D . 1993 . New Zealand Veterinary Journal , : 106 – 111 .
- Southworth , J . 1990 . Dura Se-120 heifer trials Auckland : Bomac Laboratories Limited, .
- Grace , ND , Venning , M and Vincent , G . 1994 . An evaluation of a controlled release system for selenium in lambs . New Zealand Veterinary Journal , 42 : 63 – 65 .