. 2020 Jan 30;99(3):1551–1563. doi: 10.1016/j.psj.2019.12.005

Table 7.

Breast, thigh and drumstick, fat-pad yield (% of body weight, day (d) 35), nitrogen efficiency in grower (days 10–21) and finisher (days 21–35) period, and water to feed intake ration (day 28–35).

Treatment		Breast (%)	Thigh and drumstick (%)	Fat-pad (%)	Days 10 to 21 N efficiency¹ (%)	Days 21 to 35 N efficiency¹ (%)	WI:FI² (g/g)
SP		10.29^a	9.14	0.66^b	70.89^d	55.84^d	2.08^a
20CP		10.05^a,b	9.34	0.77^b	75.59^c	62.57^c	1.86^a,b
20CP+Gly		10.33^a	9.09	0.67^b	77.62^b,c	63.73^b,c	2.00^a
18.5CP		9.99^a,b	9.44	0.85^a,b	80.16^a,b	67.41^b	1.64^c,d
18.5CP+Gly		10.48^a	9.32	0.86^a,b	80.57^a	67.47^b	1.71^b,c
17CP		10.24^a	9.31	1.00^a	80.08^a,b	72.06^a	1.49^d
17CP+Gly		9.35^b	9.47	1.04^a	82.71^a	74.50^a	1.59^c,d
SEM		0.09	0.06	0.03	0.62	0.91	0.04
Main effect
Protein	20CP	10.19	9.21	0.72^c	76.60	63.15^c	1.930^a
	18.5CP	10.23	9.38	0.86^b	80.37	67.44^b	1.676^b
	17CP	9.80	9.39	1.02^a	81.39	72.28^a	1.540^c
Gly	−	10.10	9.36	0.87	78.61	67.49	1.666^b
	+	10.05	9.29	0.86	80.30	72.28	1.765^a
P-value	ANOVA	0.006	0.489	<0.001	<0.001	<0.001	<0.001
	Protein	0.060	0.405	<0.001	<0.001	<0.001	<0.001
	Gly	0.796	0.571	0.708	0.004	0.725	0.026
	Protein × Gly	0.003	0.392	0.351	0.235	0.669	0.744

^a–dDiffering superscripts indicate significant differences between means (P < 0.05).

Abbreviations: SP, standard protein; 20CP, 20% crude protein treatment; 20CP+Gly, 20% crude protein treatment with glycine supplemented; 18.5CP, 18.5% crude protein treatment; 18.5CP+Gly, 18.5% crude protein treatment with glycine supplemented; 17CP, 17% crude protein treatment; 17CP+Gly, 17% crude protein treatment with glycine supplemented; Gly, glycine; N, nitrogen. WI: FI, water intake to feed intake ratio.

Three replicates identified in the Nitrogen Efficiency Grower from treatments SP, 17CP, and 17CP+Gly and removed. One outlier identified in the Nitrogen efficiency finisher from treatment 17CP+Gly and removed.

Two replicates from standard protein treatment, one replicate from 20CP treatment, and 3 replicates from 17CP +Gly were removed from analysis due to compromised water intake data and outliers.