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Effect of energy balance and selection for milk yield on the somatotropic axis of the lactating Holstein cow: endocrine profiles and hepatic gene expression



Effect of energy balance and selection for milk yield on the somatotropic axis of the lactating Holstein cow: endocrine profiles and hepatic gene expression



Energy metabolism in animals Proceedings of the 15th symposium on energy metabolism in animals, Snekkersten, Denmark, 11-16 September 2000: 345-348



Two studies were conducted with cows from a breeding project initiated in 1964 to develop a stable control line (CL) that represented USA breed average Holsteins in 1964 and a select line (SL) that represented contemporary USA Holsteins. Milk yield of the two lines currently differ by more than 4500 kg/305 days lactation. Multiparous cows (Study A: 9 CL, 9 SL; Study B 10 CL, 12 SL) were examined from -28 to 70 days postpartum (PP).

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