手法を比較

	見かけ総消化管消化率	体細胞数
分野	獣医科学	獣医科学
系統	Process / pipeline	Process / pipeline
提唱年	1970	1980
提唱者	Agricultural Research Community	Veterinary Milk Quality Standards
種類	Balance Study Methodology	Quantitative Screening Test
原典	Adeola, O. (2001). Digestion and balance techniques in pigs. In A. J. Lewis & L. L. Southern (Eds.), Swine Nutrition (2nd ed., pp. 903-916). CRC Press.	Philippidis, G. P., Frey, H. R., & Klug, C. (2016). Somatic cell count and milk production in dairy cattle. Journal of Dairy Science, 99(2), 1419-1427.
別名	ATTD, digestibility coefficient, fecal digestibility	SCC, mastitis indicator, milk quality assessment
関連	3	3
概要	Apparent Total Tract Digestibility (ATTD) is a measure of the proportion of a nutrient consumed in feed that is absorbed by the animal, calculated from the difference between dietary intake and fecal excretion. Standardized since the 1970s, ATTD is essential for quantifying the bioavailability of nutrients in feedstuffs, formulating balanced diets, and comparing the nutritive value of different feed ingredients across diverse animal species.	Somatic Cell Count (SCC) is a quantitative measure of the concentration of white blood cells and epithelial cells in milk, used as a primary indicator of udder health and the presence of mastitis in lactating cattle. Standardized by veterinary regulatory agencies worldwide, SCC serves as a non-invasive, cost-effective screening tool in dairy herd management and milk quality assessment.