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1 Department of Animal Science, Michigan State University, East Lansing 48824 and The Upjohn Company, 7921-25-4, Performance Enhancement Research, Kalamazoo, MI 49001
Forty-one Holstein cows were injected with 0, 5, or 14 mg/d of bST for the last 46 ± 6 d before parturition. Compared with data for controls, the 5- and 14-mg doses of bST increased apparent protein synthesis about 16% before parturition. Exogenous bST before parturition increased apparent protein degradation 30% during wk 1 after parturition. During wk 1 of lactation, 14 mg of bST also increased milk protein yield 33%. No treatment differences were present in concentration of serum NEFA, body condition score, or thickness of subcutaneous fat. Therefore, administration of bST before parturition did not alter metabolism of subcutaneous fat. Prepartum treatment with 5 and 14 mg of bST increased and maintained serum somatotropin at 6.5 and 22.7 ng/ml, respectively, compared with 1.6 ng/ml in controls. Concentrations of serum IGF-I were initially increased but were not maintained as parturition approached. On d –23, IGF binding protein 3 was increased 65% but was not different among groups by d –7. For groups administered the 5 and 14 mg/d of bST, IGF binding protein 2 was decreased 40%. Administration of bST before parturition increased protein reserves and stimulated milk protein yield for 1 wk but did not alter metabolism of subcutaneous fat. Furthermore, energy balance appeared to be a major regulator of concentrations of IGF binding protein 3 and responsiveness of IGF-I to exogenous somatotropin before parturition.
Key Words: milk protein yield • fat metabolism • recombinant bovine somatotropin • parturition
Submitted on November 8, 1993
Accepted on January 24, 1994
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