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KMID : 1094020120290030213
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Journal of Veterinary Clinics
2012 Volume.29 No. 3 p.213 ~ p.219
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Effects of Boostin-250 Supplementation on Milk Production and Health of Dairy Cows
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Kim Yo-Han
Kim Doo
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Abstract
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The recombinant bovine somatotropin (rbST) has been used for increasing milk production of dairy cows without adverse health effects. This study was conducted to compare effects of supplementation with Boostinⓡ-250 containing 250 mg of rbST on milk production with those of Posilacⓡ and Boostinⓡ-S. And safety of rbST supplementation on target animals was also observed. Each twenty-five lactating dairy cows were assigned randomly to one of four groups. Boostinⓡ-250 and vehicle (control) were administered weekly. Boostinⓡ-S and Posilacⓡ were administered two week intervals. Milk yield, milk components, milk somatic cell count, health status, and body condition score of cows were examined. Supplementation with Posilacⓡ, Boostinⓡ-S, and Boostinⓡ-250 induced more milk yield than control group by 2.9 kg/day (12.3%), 4.2 kg/day (17.9%), and 4.1 kg/day (17.4%), respectively. There was a significant difference in milk yield among three rbST treatment groups and control group (α = 0.05). The rbST supplementation did not increase the incidence of clinical mastitis and milk somatic cell counts. Supplementation with rbST did not significantly affect milk components (milk fat, protein, and solid not fat). The rbST supplementation of the dairy cows after peak milk yield did not cause negative effect on BCS. However, some cows less than 100 days in milking had decreased BCSs after rbST supplementation. In conclusion, milk production in 250 mg of rbST administered cows every week was similar to that of 500 mg of rbST administered cows every 2 weeks. And supplementation of 250 mg of rbST every week could reduce metabolic stress in cows.
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KEYWORD
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rbST, 250 mg, dairy cows, milk yield, health
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