1. American Society for Testing and Materials (ASTM) 1990. Annual book of ASTM standards, Standard tests method D584. Wool content of raw wool – Laboratory scale, Sec. 7, volume 07.01:193–197. ASTM, Philadelphia, PA, USA.
2. The nutrient requirements of ruminant livestock,1980
3. Association of American Feed Control Officials (AAFCO) 2000. Official Publication, Atlanta, GA, USA.
4. Differential display of intestinal mRNAs regulated by dietary zinc;Blanchard;Proceedings of the National Academy of Sciences of the United States of America,1996
5. 50 years of the Wyoming ram test: how sheep have changed;Burton;Journal of Animal Science,2015