Table 5.

Concentration of ceca short-chain fatty acids (SCFA) (mmol/L) in turkeys measured at day 28.^1,2

Phytase, FTU/kg	Xylanase, BXU/kg	Acetic	Propionic	Butyric	Iso-butyric	2-Me-butyric	Iso-valeric	Lactic	BCFAs4	VFAs5	Total SCFAs6
Main effect means for phytase
500 (STD)		62.11	1.01	11.33	0.04	0.05	0.00	25.69	0.09	74.69	100.25
1,500 (SD)		63.78	1.28	11.83	0.12	0.03	0.03	23.70	0.17	77.04	100.88
3,000 (MD)		67.31	1.51	11.88	0.09	0.00	0.02	29.56	0.11	80.69	110.31
Least significant difference		8.42	0.60	3.61	0.11	0.07	0.05	10.02	0.14	11.85	9.30
Main effect means for xylanase
	0 (−Xyl)	65.37	1.40	12.05	0.09	0.00	0.01	25.13	0.10	78.92	104.13
	16,000 (+Xyl)	63.43	1.14	11.31	0.08	0.05	0.02	27.51	0.14	76.02	103.50
Least significant difference		6.87	0.49	2.95	0.09	0.06	0.04	8.18	0.11	9.68	7.59
Standard deviation		11.79	0.84	5.06	0.15	0.10	0.07	14.03	0.20	16.60	13.02
P-value for main effects and interactions3
	Phytase	0.452	0.254	0.943	0.353	0.344	0.541	0.500	0.505	0.592	0.062
	Xylanase	0.577	0.310	0.623	0.733	0.069	0.759	0.564	0.496	0.554	0.870
Phytase × Xylanase		0.862	0.139	0.922	0.465	0.344	0.203	0.093	0.428	0.838	0.166

¹Data are means of 5 birds per pen with 8 pens per treatment.

²Diets consisted in 6 experimental treatments: STD-Xyl (diet containing standard dose of phytase without xylanase), STD + Xyl (diet containing standard dose of phytase with xylanase), SD-Xyl (diet containing superdosing of phytase without xylanase), SD + Xyl (diet containing superdosing with xylanase), MD-Xyl (diet containing megadosing of phytase without xylanase) and MD + Xyl (diet containing megadosing with xylanase).

³Values in the same column with different letters are significantly different (P < 0.05).

⁴BCFA: branched-chain fatty acids (iso-butyric + 2-me-butyric + iso-valeric).

⁵VFA: volatile fatty acids (acetic acid + propionic acid + butyric acid + BCFA).

⁶Total SCFA: total short-chain fatty acids (VFA + lactic acid).