Table 6.

Degradability constants and calculated effective degradability at three passage rates for crude protein disappearance of Napier grass silage after 90 days of ensiling

Fertilization	Additives	N	Degradability constants (%)				ED (%) at different outflow rates
			a	b	c	a + b	k = 0.02	k = 0.05	k = 0.08
No slurry	No-additive	6	7.8	56.9	0.007	64.8	45.2	33.3	26.9
	Molasses	6	11.9	68.2	0.002	80.1	56.7	42.8	35.3
	Maize meal	6	11.7	63.0	0.002	74.7	55.1	41.6	34.3
	Brown Sugar	6	10.7	60.8	0.002	71.6	52.3	39.6	32.6
Slurry	No-additive	6	7.0	58.1	0.001	65.1	46.9	34.9	28.5
	Molasses	6	15.5	70.3	0.001	85.8	64.7	49.8	41.7
	Maize meal	6	9.1	50.8	0.001	84.2	60.5	44.9	36.5
	Brown Sugar	6	11.7	58.7	0.002	70.3	52.1	39.5	32.8
SEM			4.79	9.33	0.0023	6.06	5.07	4.73	4.56
Fertilization
No slurry		24	10.5	62.2	0.003	72.8	52.5	39.3	32.3
Slurry		24	10.8	59.5	0.002	76.4	56.1	42.3	34.8
SEM			2.39	4.66	0.0012	3.03	2.54	2.36	2.28
Additive
	No-additive	12	7.4	57.5	0.004	64.9b	46.1	34.1	27.7
	Molasses	12	13.7	69.2	0.002	82.9a	60.7	46.3	38.5
	Maize meal	12	10.4	56.9	0.002	79.4ab	57.8	43.3	35.4
	Brown Sugar	12	11.2	59.8	0.002	71.0ab	52.5	39.6	32.7
SEM			3.39	6.60	0.0017	4.29	3.59	3.34	3.23
Significance
	Fertilization (F)		ns	ns	ns	ns	Ns	ns	ns
	Additives (A)		ns	ns	ns	*	Ns	ns	ns
	F x A		ns	ns	ns	ns	Ns	ns	ns

a, soluble fraction; b, insoluble but potentially degradable fraction; a + b, potential degradability; c, outflow rate of degradation (h⁻¹); ED, effective degradability; k, rumen outflow rate (h⁻¹); N, number of observations; %, percentage; SEM, standard error mean.

Column means with different superscripts differ significantly at P < 0.05.

*P < 0.05; ns, non-significant: P > 0.05.