Table 4. The effect of dietary marine derived Ca-Mg complex supplementation to gestating and lactating sows in four successive parities on the performance of their litters

Items	Parity 1			Parity 2			Parity 3			Parity 4			SEM	p-value
Items	CON¹⁾	CM1	CM2	CON	CM1	CM2	CON	CM1	CM2	CON	CM1	CM2	SEM	Parity	Treatment	P × T
Initial number	13.66^bB	14.83^a	14.58^a	13.79^bB	14.80^a	14.66^a	14.70^bA	15.40^a	14.90^ab	14.79^a	15.30	15.25	0.242	***	***	NS
Final number	13.40^bB	14.83^a	14.58^a	13.50^bB	14.60^a	14.54^a	14.30^a	15	14.58	14.41^a	15.08	15.04	0.258	**	***	NS
Survival rate (%)	98.20^b	100^a	100^a	97.90	98.50	99.04	97.20	97.30	97.78	97.47	98.30	98.65	0.614	**	*	NS
Birth weight (kg)	1.69	1.67	1.69	1.68	1.70	1.70	1.73	1.70	1.69	1.71	1.67	1.70	0.02	NS	NS	NS
Weaning weight (kg)	6.40^b	6.75^a	6.67^a	6.45^b	6.82^a	6.80^a	6.40^b	6.80^a	6.70^a	6.46	6.74	6.72	0.05	NS	***	NS
Average daily gain (g)	225^b	242^a	237^a	227^b	244^a	241^a	225^b	243^a	240^a	227^b	241^a	240^a	2.12	NS	***	NS

CON, basal diet; CM1, basal diet – MgO - 0.3% limestone + 0.40% marine derived Ca-Mg complex; CM2, basal diet - MgO - 0.7% limestone + 0.40% marine derived Ca-Mg complex.
Different superscripts within a row indicate a significant difference (p < 0.05) in response to treatment diets CM1 and CM2.
Different superscripts within a row indicate a significant difference (p < 0.05) among parity.
p < 0.05;
p < 0.01,
p <0.0001.
P × T, interactive effects between parity and dietary treatments; NS, non-significant.