Effect of supplemental glycerol monolaurate and oregano essential oil blend on the growth performance, intestinal morphology, and amino acid digestibility of broiler chickens

Table 1 Effects of supplemental GLM and oregano EO blend on the broilers’ growth performance

Parameters	T1	T2	T3	T4	SEM	Regression *
						Linear	Quadratic	Cubic
Initial Wt. (g)	75.66	76.58	76.83	76.83	0.26	0.32	0.56	0.90
Starter period
BW(g)	217.55	224.75	216.91	211.79	2.76	0.51	0.46	0.62
BWG(g)	141.88	148.16	140.08	134.95	2.61	0.42	0.46	0.60
FI (g)	186.55	191.75	183.50	176.95	2.45	0.26	0.41	0.62
FCR	1.31	1.29	1.31	1.31	0.01	0.86	0.75	0.69
Grower period
BW(g)	836.88	893.87	855.58	895.41	11.64	0.38	0.80	0.25
BWG(g)	619.33	669.12	638.66	683.62	9.73	0.20	0.92	0.20
FI (g)	976.11	917.95	885.33	943.45	16.59	0.56	0.24	0.57
FCR	1.57^a	1.37^b	1.38^b	1.37^b	0.02	0.008	0.03	0.20
Finisher period
BW(g)	1844.22^b	1973.08^ab	1933.95^ab	2046.04^a	21.85	0.04	0.87	0.19
BWG(g)	1007.33^b	1079.20^ab	1078.37^ab	1150.62^a	15.08	0.02	0.99	0.37
FI(g)	2014.00	2024.16	1997.50	2061.20	19.57	0.68	0.65	0.62
FCR	1.99^a	1.88^ab	1.85^ab	1.79^b	0.01	0.01	0.60	0.56
Overall performance
BW(g)	1844.22^b	1973.08^ab	1933.95^ab	2046.04^a	1844.22^b	0.04	0.87	0.19
BWG(g)	1768.55^b	1896.50^ab	1857.12^ab	1969.20^a	21.66	0.04	0.88	0.18
FI (g)	3176.66	3133.87	3066.33	3181.62	34.69	0.91	0.45	0.65
FCR	1.79^a	1.65^b	1.65 ^b	1.61^b	0.01	0.004	0.13	0.25
PER	2.68^b	2.91^ab	2.92^ab	2.98^a	0.02	0.006	0.17	0.28
RGR	184.21^b	185.03^ab	184.69^ab	185.50^a	0.13	0.02	0.99	0.09

^a,b Means within the same row carrying different superscripts are significantly different (P < 0.05). BW: body weight, BWG: body weight gain, FI: feed intake, FCR: feed conversion ratio, PER: protein efficiency ratio, RGR: relative growth rate. T1: Control group; T2, T3, and T4: basal diet supplemented with 0.15 or 0.45 or 0.75% mixture of GLM and EO, respectively. * Regression is significant at P < 0.05

ISSN: 1746-6148