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1 Colorado State University, Fort Collins 80523
2 Monsanto Company, St Louis, MO 63188
Effects of daily sometribove administration on milk yield and composition, body condition score, BW, and SCC were evaluated in Holstein cows milked three times daily. Lactating cows (n = 104) were assigned randomly to control or sometribove-treated (25 mg/d) groups. The experimental period was 16 wk, consisting of 2-wk pretreatment, 12-wk treatment, and 2-wk posttreatment periods. AU cows were injected once dairy starting at 53 to 180 d postpartum, housed in free stalls, and fed one of five total mixed rations according to milk production. Body weights were measured weekly, and body condition was scored biweekly. Milk yield was recorded daily, and weekly milk samples were analyzed for fat, protein, lactose, total solids, and SCC. Milk yield and milk protein were increased 18.8% (38.6 vs. 32.5 kg/d) and 3.3% (3.1 vs. 3.0%), respectively, whereas percentage of milk fat, lactose, SNF, SCC, and BW were unaffected by treatment. Overall average body condition scores were lower for the sometribove-treated group versus control (2.2 vs. 2.4). No apparent differences in the number of cows treated for mastitis, foot rot, displaced abomasum, or lameness were observed between treatment groups. Sometribove treatment significantly enhanced milk yield (6.1 kg/d) with no apparent negative effects on health in high producing cows milked thee times per day.
Key Words: somatotropin • dairy cows • milking three times daily
Submitted on February 23, 1990
Accepted on August 13, 1990
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  A. Al-Seaf, J. F. Keown, and L. D. Van Vleck Genetic Parameters for Yield Traits of Cows Treated or Not Treated with Bovine Somatotropin J Dairy Sci, January 1, 2007; 90(1): 501 - 506. [Abstract] [Full Text] [PDF]
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