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Effects Of Feeding Rumen-Degradable Valine On Milk Production In Late-Lactating Dairy Cows, Kayla Hultquist, David Casper
Effects Of Feeding Rumen-Degradable Valine On Milk Production In Late-Lactating Dairy Cows, Kayla Hultquist, David Casper
David Casper
The study objective was to determine if feeding the rumen-degradable AA Val can increase milk production comparable to recombinant bovine somatotropin (bST). Eight multiparous late-lactating (255 ± 26.4 d in milk) Holstein dairy cows were blocked by milk yield (34.1 ± 8.25 kg/d) and randomly assigned to 1 of 4 treatments in a replicated 4 × 4 Latin square design with 21-d periods (7 d for dietary adaptation and 14 d for data collection). Treatments were control (CON), a single injection of recombinant bST (rbST), and Val fed at 40 (V40) and 80 g/d (V80). Cows were fed a total …