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KMID : 1025520000420040451
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Journal of Animal Science and Technology
2000 Volume.42 No. 4 p.451 ~ p.458
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Effects of rbST Administration on the Changes in the Concentration of Blood and Carcass Hormones in Holstein Bulls and Steers
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김준식/Kim, J. S.
김종복/김현섭/권응기/남기택/윤상기/Kim, J. B./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 the changes in the concentration of blood and carcass hormones in Holstein bulls and steers. A total of thirty-two Holstein calves including twenty-four Holstein steers castrated at about 2 months after birth were randomly assigned to one of four treatments; bull group, steer group (only castration), rbST₁ group (steer injected with rbST at about 80kg BW) and rbST₂ group (steer injected with rbST at about 300㎏ BW). rbST was injected every 14 days at the dose of 0.03㎎/㎏/day in turn on the rump and the shoulder. Serum bST concentration at 100㎏ BW was higher in rbST, group (39.08ng/㎖) than in steer group (7.80ng/㎖), and also that at 500 and 650㎏ BW were higher in rbST treatment groups (1.15-3.98ng/㎖) than in steer group (0.33-0.63ng/㎖). The highest serum bST concentration by the lapse of time after rbST injection (0, 2, 7, 10, 14d) was obtained at 2 days after bST injection in rbST₂ group (26.40ng/㎖), which was about 2.8-10.4 times higher compared with that in rbST₁ group (9.50ng/㎖) and in steer group (2.55ng/㎖). IGF-I concentration was also highest 2 days after bST injection in order of rbST₂(442.41), rbST₁(333.38) and rbST_0 (187.40ng/㎖). Serum cortisol concentration was increased as the growth stage progressed in all treatments, especially showing increase of 1.15-1.63㎍/㎗ at 300㎏ BW. Cortisol concentration in steer groups after 300㎏ BW tended to be higher than any other groups. The bST concentrations in rump, shoulder, muscle, kidney and liver were not significantly different between rbST treatment and rbST non-treatment group, but tended to be increased in rbST compared to non-rbST treatment.
In conclusion, additional studies on livestock products treated by rbST are continuously to be needed in considering palatability of consumers who prefer a high quality and safe food products.
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