. 2020 Aug 12;99(11):5792–5801. doi: 10.1016/j.psj.2020.06.082

Table 3.

Effect of dietary Ca, available P levels, and phytase on body weight, feed intake, and feed conversion ratio of single-comb White Leghorn hens from 68 to 78 wk of age.¹^,²^,³

Weeks of age	Pre-experimental period	Experimental period
Weeks of age	68	68–69	70–71	72–73	74–75	76–78
Hen body weight, kg
PC	1.659	1.673	1.641^a	1.639^a	1.641^a	1.622^a
NC1	1.669	1.654	1.600^a,b	1.587^a	1.557^b,c	1.524^b,c
NC2	1.657	1.632	1.553^b	1.506^b	1.482^c	1.441^c
NC1 + BSP	1.641	1.641	1.606^a,b	1.590^a	1.584^a,b	1.575^a,b
NC2 + BSP	1.662	1.679	1.619^a,b	1.631^a	1.626^a,b	1.603^a
Pooled SEM	0.020	---------------------------0.030---------------------------
P-value
Diet	0.875
Diet × Age		---------------------------0.001---------------------------
Feed intake, kg/d/hen
PC	--	0.113^a	0.106^a	0.104^a	0.110^a,b	0.104
NC1	--	0.105^b	0.099^b	0.102^a,b	0.105^b,c	0.105
NC2	--	0.103^b	0.101^a,b	0.097^b	0.103^c	0.105
NC1 + BSP	--	0.108^a,b	0.103^a,b	0.105^a	0.108^a,b,c	0.107
NC2 + BSP	--	0.108^a,b	0.103^a,b	0.106^a	0.111^a	0.108
Pooled SEM		--------------------------0.002---------------------------
P-value: Diet × Age		--------------------------0.001---------------------------
FCR, kg feed/dozen eggs
PC	--	1.500	1.447	1.360^b	1.419^b	1.350^b
NC1	--	1.354	1.347	1.417^b	1.444^b	1.467^b
NC2	--	1.282	1.488	1.703^a	1.865^a	1.736^a
NC1 + BSP	--	1.346	1.309	1.362^b	1.439^b	1.396^b
NC2 + BSP	--	1.369	1.342	1.462^b	1.611^b	1.506^b
Pooled SEM		--------------------------0.083---------------------------
P-value: Diet × Age		--------------------------0.001---------------------------

^a–cTreatment means with no common superscript within each column for each parameter differ significantly (P ≤ 0.05).

Treatment means for hen BW were calculated with n = 20 for each 2-wk interval from week 68 to 75 and for the 3-wk interval from weeks 76 to 78.

Treatment means for feed intake and feed conversion ratio at each age range were calculated with 20 replicates.

PC, positive control (nutrient-adequate diet with 3.5% Ca and 0.35% available P), NC1, negative control 1 (the PC reduced in Ca and available P by 0.187 and 0.159% of the diet, respectively); NC2, negative control 2 (the PC reduced in Ca and available P by 0.231 and 0.275% of the diet, respectively); and NC1 + BSP and NC2 + BSP, the NC diets supplemented with Buttiauxella sp. phytase at 600 FTU/kg.