The effect of the ratio of standardized ileal digestible lysine to metabolizable energy on growth performance, blood metabolites and hormones of lactating sows

Table 4 The effect of dietary ME level on sow feed intake in lactation (Exp. 1)

Item	Parity	No.	ME level, Mcal/kg								P-value
			3.06	3.16	3.20	3.25	3.30	3.40	Mean²	SEM	Treat	Linear	Quadratic
Feed intake, kg/d	1	36	5.17^a	5.18^ab	5.43^bc	5.46^c	5.39^abc	5.21^ab	5.31^x	0.10	0.07	0.39	0.01
	2	36	5.57^ac	5.39^ae	6.00^b	5.82^bd	5.65^cd	5.30^e	5.63^y	0.12	< 0.01	0.25	< 0.01
	3+	113	5.61^ad	5.68^a	5.98^b	5.92^bc	5.70^ac	5.40^d	5.72^y	0.09	< 0.01	0.18	< 0.01
	Overall¹	185	5.53^a	5.54^a	5.90^b	5.82^b	5.64^a	5.35^c	5.63	0.07	< 0.01	0.17	< 0.01
Lysine intake, g/d	1	36	50.11^c	50.22^bc	53.21^a	53.55^a	52.81^ab	51.07^abc	51.84^x	1.01	0.02	0.23	0.01
	2	36	54.07^cd	52.25^d	58.81^a	57.00^ab	55.41^bc	51.99^d	54.95^y	1.25	< 0.01	0.39	< 0.01
	3+	113	54.46^cd	55.08^cd	58.60^a	57.99^ab	55.87^bc	52.91^d	55.82^y	0.94	< 0.01	0.38	< 0.01
	Overall¹	185	52.86^c	52.98^bc	56.96^a	56.28^a	54.49^b	51.65^c	54.20	0.72	< 0.01	0.42	< 0.01

¹Parity effect was included in the model
²Parity effect; treatment effect was included in the model
^{a, b, c, d}Within a row, values with no common superscript differ significantly (P < 0.05)
^{x, y}Within a column, values with no common superscript differ significantly (P < 0.05)

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