Table 8.

Daily Zn balance, ATTD, and TTTD of Zn for sows during gestation and lactation when fed diets not supplemented with Zn

	Gestation		Lactation
Item	LowZn	SE	LowZn	SE
No. of sows	20	—	18	—
ADFI, kg/d	2.22	—	8.09	1.1
Diet dry matter (DM), %	86.8	—	87.7	—
ADFI, kg/d DM	1.93	—	7.10	0.9
Diet Zn, mg/kg DM	25	—	33	—
Diet Ti, mg/kg DM	3,422	—	3,158	—
Zn consumed, mg/d DM	487	—	231	7.8
Ti consumed, mg/d DM	6,601	—	21,890	740.0
Fecal excretion1, kg/d DM	0.26	<0.01	0.88	0.03
Fecal Zn, mg/kg DM	372	45.8	203	8.4
Fecal Ti, mg/kg DM	26,028	871.5	25,705	623.5
Fecal Zn excreted2, mg/d	90	6.7	171	6.1
Fecal Ti excreted3, mg/d	6,601	0.1	21,890	740.0
DM digestibility4, %	86.6	0.5	87.6	0.3
ATTD Zn5, %	−107.4	31.2	25.6	1.3
TTTD Zn6, %	131.5	4.7	110.4	0.2
Urine excretion, kg/d	20.3	5.6	14.2	1.9
Urine Zn concentration, mg/kg	0.3	0.1	0.3	<0.1
Urine Zn excreted7, mg/d	3	0.3	4	0.3
Milk yield, kg/d	—	—	10.5	0.4
Milk Zn concentration, mg/kg	—	—	4.3	0.2
Milk Zn secreted8, mg/d	—	—	45	2.6
Total Zn excreted9, mg/d	92	6.7	220	6.1
Zn retained10, mg/d	−454	6.7	11	2.8

¹Fecal excretion = DM_intake * (Ti_diet/ Ti_feces).

²Fecal Zn excreted = Zn_feces * Output_feces.

³Fecal Ti excreted = Ti_feces * Output_feces.

⁴DM digestibility, % = [1 − (Ti_diet/Ti_feces)] * 100.

⁵ATTD Zn, % = [1 – (Zn_feces/Zn_diet) × (M_diet/M_feces)] * 100.

⁶TTTD Zn, % = ATTD + [(Zn_end/Zn_diet)*100].

⁷Urine Zn excreted = (Zn_urine * Urine_output).

⁸Milk Zn secreted = (Zn_milk * Milk_output).

⁹Total Zn excreted = (Fecal Zn_excreted + Urine Zn_excreted).

¹⁰Zn retained = (Zn_intake – Zn_excreted).