• In Sacco Nylon Bag Degradation Dynamics:
• Ørskov and McDonald (1979) established the non-linear exponential model to describe ruminal nutrient disappearance over incubation time ($t$):

where:

• $p$ = degradation at time $t$
• $a$ = rapidly soluble, instantly washable fraction (intercept)
• $b$ = potentially degradable insoluble fraction
• $c$ = fractional rate constant of degradation of fraction $b$
• The effective degradability ($P$ or $ED$) accounting for rumen outflow rate ($k$) is:

• nalysis:
• Correct mathematical representation of the potential degradability equation ($p = a + b(1 - e^{-ct})$).

Correct option: (3) P=asb (1-2)