The effects of abomasal infusions of casein or soya-bean-protein isolate on the milk production of dairy cows in mid-lactation

The British Journal of Nutrition
J J Choung, D G Chamberlain

Abstract

The effects of abomasal infusion of casein or soya-bean-protein isolate (SPI) on milk production were investigated in four Friesian cows in mid-lactation receiving a basal diet of grass silage and barley which supplied energy and protein considerably in excess of requirements for milk production by conventional rationing standards. Three levels of infusion were used for each protein source, the corresponding doses being isonitrogenous for each of the proteins: 100, 220 and 330 g/d for casein and 115, 230 and 345 g/d for SPI. Casein produced much greater effects on the yield of milk and milk constituents than did SPI. On the highest dose of casein, milk yield was increased by 3.5 kg/d, fat output by 15% and protein output by 36%; corresponding values for the highest dose of SPI were 1.6 kg/d, 12% and 13% respectively. Increases in the yield of milk-protein were linear for casein but for SPI there was no increase beyond the first level of infusion. It was calculated that casein infusion had a marked effect on the utilization of energy: the increases in milk production could be explained either by a channelling of an extra 12 MJ metabolizable energy (ME)/d away from body tissue synthesis and into milk synthesis or by an increase i...Continue Reading

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Citations

Dec 22, 1999·The Proceedings of the Nutrition Society·P Faverdin
Dec 19, 2000·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·T G KimD G Chamberlain
Jan 9, 2013·Journal of Dairy Science·R MartineauH Lapierre
Aug 5, 2004·Journal of Dairy Science·L DoepelH Lapierre
Oct 1, 1994·Journal of Dairy Science·J H HarrisonM R Stokes

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