Table 3.

Effect of β-mannanase supplementation in diets containing copra meal on growth performance and breast meat quality in broiler chickens¹⁾

Items		Dietary treatments					SEM	p-value2)
		CON	Supplemental levels of β-mannanase in 10% CM diets
			0%	0.05%	0.10%	0.20%		Total	Linear	Quadratic
Growth performance
BWG (kg)		2.06	2.03	1.99	1.97	2.02	0.028	0.175	0.885	0.112
FI (kg)		3.15	3.19	3.12	3.16	3.20	0.092	0.422	0.452	0.158
FCR (kg/kg)		1.53c	1.57ab	1.57b	1.60a	1.59ab	0.033	0.001	0.201	0.350
Breast meat quality
pH	1 h	6.08	6.01	6.00	6.14	6.13	0.101	0.208	0.060	0.550
	24 h	5.64	5.75	5.71	5.74	5.76	0.068	0.301	0.686	0.644
Meat color	L*	45.3	43.0	44.1	45.2	44.9	0.81	0.102	0.049	0.140
	a*	3.49	4.39	4.36	3.11	3.11	0.510	0.136	0.028	0.503
	b*	12.1	12.5	12.3	12.9	13.4	0.66	0.650	0.268	0.785
WHC (%)		70.5	73.8	69.5	68.7	70.9	1.87	0.384	0.410	0.070
TBARS		0.45	0.57	0.46	0.46	0.48	0.043	0.290	0.248	0.117

CON, corn and SBM-based control diets; CM, copra meal; SEM, standard error of means; BWG, body weight gain; FI, feed intake; FCR, feed conversion ratio; L*, lightness; a*, redness; b*, yellowness; WHC, water holding capacity; TBARS, thiobarbituric acid-reactive substances.

¹⁾Data are least squares means of 8 observations per treatment.

²⁾Total = overall effects of treatments; Linear and quadratic effects of increasing β-mannanase supplementation in 10% CM diets without the data for CON treatment.

^a–cMeans with different superscripts within a row differ (p<0.05).