The Dairy Science Department at South Dakota State University will be presenting breakthrough research on a new mechanism for enhancing milk production in lactating dairy cows at the upcoming Joint Annual Meeting (JAM) of the American Dairy Science Association and American Society of Animal Science (ADSA/ASAS) during the week of July 12 to 16, 2015, in Orlando, Fla.
SDSU Dairy Science Graduate Student, Kayla Hultquist and her advisor, David Casper, Assistant Professor of Dairy Science, will be presenting the results of her master’s research study (view the results here) which demonstrates that feeding a ruminally degradable synthetic amino acid to late lactation Holstein dairy cows resulted in similar increases in milk production as when cows were receiving recombinant bovine somatotropin (rBST), also known as growth hormone.
“Milk production was significantly increased with rBST or when feeding a synthetic amino acid at two inclusion rates compared to lactating dairy cows not receiving either rBST or amino acid,” explained Hultquist.
Casper added; “This new mechanism/model explains why changes in ration formulation on commercial dairy operations can often times result in quite variable responses - increase, no change, or decrease - in milk production when rations are balanced for rumen bypass amino acids,” he said.
The research showed that changes in ration formulation to accomplish methionine and lysine balancing can affect the supply of a key rumen degradable amino acid that can affect the endocrine status of the lactating dairy cow.
Source: SDSU Extension