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

Table 2.

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

Breed group²	LY (kg)	IY (kg)	PY (kg)	YD (kg)	DP (d)	LL (d)	ln(a)	c
Pure breed
Boran (B)	947±42.3^e	1.0±0.2^d	3.5±0.2^e	1.8±0.13^e	53.9±1.9^a	211.1±7.2^c	−2.25±0.03^d	0.016±0.0003^c
Horro (H)	1,210±37.9^de	3.9±0.2^c	5.5±0.2^d	2.8±0.12^d	29.1±1.7^b	234.9±6.5^bc	−1.95±0.03^cd	0.017±0.0003^c
Two breed cross
1/4 F 3/4B	1,476±95.2^cd	5.9±0.4^b	8.2±0.5^bc	4.3±0.29^bc	33.1±4.4^b	279.0±16.6^abc	−1.51±0.07^ab	0.015±0.0007^bc
1/2F 1/2B	2,031±20.9^a	8.4±0.1^a	11.0±0.1^a	6.4±0.06^a	32.6±1.0^b	337.2±3.6^a	−1.32±0.02^a	0.012±0.0001^a
9/16F 7/16B	1,682±147.4^bcd	7.1±0.7^b	9.8±0.7^ab	5.6±0.46^ab	26.0±6.8^b	323.3±25.7^a	−1.33±0.11^a	0.013±0.0011^abc
5/8F 3/8B	2,134±52.1^a	8.8±0.2^a	11.4±0.2^a	6.6±0.16^a	31.5±2.4^b	329.1±9.1^a	−1.28±0.04^a	0.012±0.0004^ab
3/4F 1/4B	2,240±35.9^a	8.9±0.2^a	11.6±0.2^a	7.0±0.11^a	32.3±1.6^b	343.2±6.3^a	−1.25±0.03^a	0.011±0.0003^a
13/16F 3/16B	2,490±178.9^a	10.5±0.8^a	12.7±0.9^a	7.6±0.55^a	34.8±8.2^b	361.4±31.2^a	−1.10±0.13^a	0.012±0.0013^ab
7/8F 1/8B	2,410±92.4^a	9.8±0.4^a	12.1±0.4^a	7.6±0.29^a	24.8±4.2^b	299.0±16.1^ab	−1.20±0.07^a	0.012±0.0007^ab
1/2J 1/2B	1,788±26.5^bc	7.0±0.1^b	9.4±0.1^b	5.6±0.08^ab	33.3±1.2^b	315.3±.6^a	−1.51±0.02^ab	0.011±0.0002^a
9/16J 7/16B	1,496±141.7^cd	5.4±0.7^bc	7.8±0.7^bcd	4.7±0.44^bc	46.8±6.5^ab	312.4±24.7^a	−1.69±0.10^abc	0.011±0.0010^a
5/8J 3/8B	1,707±96.7^bc	6.8±0.5^b	9.0±0.5^bc	5.4±0.30^ab	26.3±4.4^b	320.6±16.9^a	−1.54±0.07^ab	0.012±0.0007^ab
3/4J 1/4B	1,832±56.0^abc	6.8±0.3^b	9.2±0.3^b	5.7±0.17^ab	37.5±2.6^b	302.8±9.8^a	−1.57±0.04^ab	0.011±0.0004^a
1/2S 1/2B	1,900±35.0^ab	7.3±0.2^ab	10.4±0.2^a	6.0±0.11^a	38.6±1.6^b	339.1±6.1^a	−1.48±0.03^a	0.011±0.0003^a
1/4F 3/4H	1,346±68.2 ^cde	5.2±0.3^bc	7.0±0.3^cd	3.7±0.21^cd	30.4±3.1^b	271.0±11.9^abc	−1.70±0.05^bc	0.015±0.0005^bc
3/8F 5/8H	1,809±152.9^abc	7.9±0.7^ab	10.2±0.7^ab	5.8±0.47^ab	27.0±7.0^b	324.5±26.7^a	−1.33±0.11^a	0.013±0.0011^abc
1/2F 1/2H	1,836±31.6^abc	7.1±0.1^b	9.8±0.2^ab	5.7±0.10^ab	36.1±1.5^b	321.0±5.5^a	−1.46±0.02^a	0.012±0.0002^ab
3/4F 1/4H	2,184±72.8^a	8.7±0.3^a	11.5±0.3^a	6.8±0.23^a	38.2±3.3^b	360.7±12.7^a	−1.31±0.05^a	0.011±0.0005^a
1/4J 3/4H	1,404±174.3^cde	5.4±0.8^bc	7.8±0.8^bcd	4.1±0.54^bcd	34.6±8.0^b	285.0±30.4^abc	−1.78±0.13^bcd	0.012±0.0012^ab
1/2J 1/2H	1,621±33.1^cd	6.5±0.2^b	8.5±0.2^bc	4.9±0.10^b	32.5±1.5^b	303.8±5.8^a	−1.60±0.02^ab	0.012±0.0002^ab
3/4J 1/4H	1,724±73.9^bc	7.4±0.3^ab	9.7±0.4^ab	5.5±0.23^ab	29.4±3.4^b	329.0±12.9^a	−1.53±0.05^ab	0.011±0.0005^a
1/2S 1/2H	1,662±40.0^cd	6.5±0.2^b	8.8±0.2^bc	5.2±0.12^b	34.3±1.8^b	299.2±7.0^a	−1.57±0.03^ab	0.012±0.0003^ab
3/4S 1/4H	1,876±125.9^abc	6.6±0.6^b	10.1±0.6^ab	5.9±0.39^ab	47.0±5.8^ab	309.3±22.0^a	−1.42±0.09^a	0.012±0.0009^ab

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.

F = Friesian, J = Jersey and S = Simmental.

^a,b,c,d

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