Table 2.

Effects of increasing mammary glucose supply on milk protein composition in lactating dairy goats

Items	Infused glucose, g/d						SEM	P-value
	0	20	40	60	80	100		Linear	Quadratic	Cubic
Protein profile, % of milk protein
αS2-casein	10.6	11.3	12.8	14.3	12.4	11.7	1.05	0.21	0.03	0.52
β-casein	55.5	52.5	55.0	52.7	54.4	54.2	1.86	0.85	0.53	0.66
κ-casein	16.6	17.5	15.5	15.0	14.9	15.9	1.00	0.11	0.29	0.15
α-lactalbumin	3.78	4.07	4.27	5.55	4.15	3.57	0.44	0.90	0.02	0.27
β-lactoglobulin	13.5	14.7	12.5	12.5	14.1	14.6	1.06	0.65	0.24	0.53
Protein fraction yield, g/d
αS2-casein	2.81	3.17	3.88	4.66	3.44	3.58	0.28	0.03	< 0.01	0.77
β-casein	15.1	14.9	16.8	17.4	15.3	16.6	1.09	0.30	0.40	0.87
κ-casein	4.44	4.95	4.70	4.99	4.17	4.97	0.43	0.87	0.82	0.21
α-lactalbumin	1.01	1.19	1.30	1.84	1.17	1.12	0.15	0.43	< 0.01	0.48
β-lactoglobulin	3.60	4.19	3.76	4.07	3.96	4.45	0.33	0.18	0.80	0.31