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KMID : 1025520000420030269
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Journal of Animal Science and Technology
2000 Volume.42 No. 3 p.269 ~ p.278
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Effects of rbST Injection Time on Hematological Values and Blood Metabolic Substrates in Holstein Steers
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김준식/Kim, J. S.
홍병주/김현섭/권응기/남기택/윤상기/Hong, B. J./Kim, H. S./Kweon, U. G./Nam, K. T./Yun, S. K.
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Abstract
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This experiment was conducted to investigate the effects of rbST administration on hematological values, blood chemistry components and hormone changes in Holstein steers. Twenty-four Holstein steers castrated at 2 months after birth were randomly assigned to one of three treatments; control (rbST non-treatment, rbST_0), rbST treatment at about 80㎏ BW (rbST₁) and rbST treatment at about 300㎏ BW (rbST₂). rbST was injected every 14 days at the dose of 0.03㎎/㎏/day in turn on the rump and the shoulder. The values of RBC, Hb and HCT at the treatment of rbST were significantly decreased compared to rbST_0 (p $lt; .05), regardless of rbST injection time. Glucose concentration was highest at about 300㎏ BW in all treatments, especially significantly higher at rbST treatment groups than at rbST non-treatment group(p $lt; .05). BUN and albumin cocentrations appeared to be decreased in the rbST treatment groups from about 300㎏ BW. Total cholesterol and triglyceride concentrations were responsed differently according to growth stage and rbST treatment, and total protein, Ca and P concentrations were not significantly different among treatments. Serum IGF-I concentration tended to be increased with growth developed, especially higher in rbST treatment groups (556.2-569.5ng/㎖) than in rbST non-treatment group (398.7ng/㎖) at about 500㎏ BW. On the contrary, serum insulin concentration at about 300㎏ BW was significantly lower in rbST₂ (11.44ng/㎖), and that at about 500㎏ BW was lower in rbST₁ (16.37ng/㎖) and rbST₂= (13.10ng/㎖) than in control (24.76ng/㎖).
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KEYWORD
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