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Effects of field and laboratory heat stress on milk and physiological parameters of lactating dairy cows supplemented with sometribove (methionyl bovine somatotropin, BST)



Effects of field and laboratory heat stress on milk and physiological parameters of lactating dairy cows supplemented with sometribove (methionyl bovine somatotropin, BST)



Journal of Dairy Science 71(Suppl. 1): 124



Somatotropin (GH)-treated and untreated Holstein-Friesian cows averaged 35.1 and 28.1 kg milk daily during 30 days on farm, 32.8 and 25 kg during 10 days at 15-22 degrees C, and 28.2 and 20.9 kg during 10 days at 25-35 degrees C; in the latter 2 periods milk fat and protein were also higher with GH (3.0-3.1 and 3.0% vs. 2.6-2.7 and 2.9-2.7% resp.), and DM intake was also increased.

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Accession: 001580866

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