Effect of source and amount of protein on milk production in dairy goats
T. Sahlu, J. M. Fernandez, Z. H. Jia, A. O. Akinsoyinu, S. P. Hart, and T. H. TehJournal of Dairy Science 76:2701-2710. 1993.
Forty multiparous Alpine does (mean BW of 61.5 kg) were utilized in a 13-wk trial to investigate the effects of a TMR differing in CP amount (13 or 17%) and source (solvent-extracted soybean meal or heat-treated soybean meal with or without urea) on lactational performance. Protein supplements contributed 30% of the N in 13% CP diets and 50% of the N in 17% CP diets. All diets were isoenergetic (2.5 Mcal of metabolizable energy/kg of DM) and were fed for ad libitum intake for the entire trial. Mean DMI (2.88 kg/d), milk production (2.65 kg/d), milk fat (4.05%), milk protein (2.68%), milk lactose (4.54%), and milk solids-non-fat (7.81%) did not differ among dietary treatments. Plasma urea N was greater 23.2 vs. 10.9 mg/dL) in does receiving the 17% CP diets; however, blood hematocrit (27.4%), ß-hydroxybutyrate (843 M), plasma glucose (68.8 mg/dL), NEFA (600 eq/dL), and plasma total protein (74.5 g/L) were not significantly affected by treatment. The apparent absence of a dietary effect on lactational performance may be due to the high DMI of the does (4.7% when expressed as DMI per kilogram of BW) and high CP intake providing a surfeit of protein relative to requirements.
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