. 2013 Sep;26(9):1237–1246. doi: 10.5713/ajas.2013.13040

Table 3.

Least squares means (±standard errors) for lactation pattern and milk production traits and lactation curve parameters¹

Parity	N	LY (kg)	IY (kg)	PY (kg)	YD (kg)	DP (d)	LL (d)	ln(a)	c
1	1,361	1,443±24.2^c	4.9±0.1^d	7.5±0.1^d	4.4±0.07^d	39.6±1.1^a	322.6±4.2^a	−1.79±0.02^d	0.012±0.0002^a
2	1,138	1,680±25.1^b	6.4±0.1^c	8.9±0.1^c	5.1±0.08^c	35.4±1.2^b	317.2±4.4^ab	−1.59±0.02^c	0.012±0.0002^ab
3	917	1,805±26.9^a	7.0±0.1^b	9.5±0.1^b	5.5±0.08^b	35.5±1.2^b	311.2±4.7^ab	−1.49±0.02^b	0.013±0.0002^bc
4	739	1,878±28.7^a	7.5±0.1^a	9.9±0.1^ab	5.7±0.09^ab	33.6±1.3^bc	314.6±5.0^ab	−1.45±0.02^ab	0.013±0.0002^bc
5	540	1,892±31.8^a	7.7±0.1^a	10.1±0.2^a	5.8±0.10^a	31.0±1.5^c	305.9±5.5^bc	−1.40±0.02^a	0.013±0.0002^cd
6	380	1,837±35.8^a	7.3±0.2^ab	9.7±0.2^ab	5.6±0.11^ab	34.9±1.6^bc	302.3±6.2^bc	−1.45±0.03^ab	0.013±0.0003^cd
≥7	432	1,884±35.6^a	7.6±0.2^a	9.8±0.2^ab	5.8±0.11^ab	30.4±1.6^c	290.8±6.2^c	−1.38±0.03^a	0.014±0.0003^d

LY = Lactation milk yield; IY = Initial milk yield; PY = Peak milk yield; YD = Average yield per d; DP = Days to peak; LL = Lactation length; ln(a) and c = parameters of the MIG function.

^a,b,c,d

Least squares means within a column group with different letters differ significantly (p<0.001).