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KMID : 1025520030450060975
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Journal of Animal Science and Technology
2003 Volume.45 No. 6 p.975 ~ p.986
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Effect of the Level of Concentrates and Pasture Grazing on Growth, Feed Efficiency and Reproductive Performance in Autumn Born Hanwoo Heifers
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강수원/Kang, S. W.
임석기/정종원/장선식/전기준/Im, S. K./Jeong, J. W./Jang, S. S./Jeon, K. J.
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Abstract
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Present study was conducted to investigate the effect of the level of concentrates and pasture grazing in 36 autumn born Hanwoo heifers(initial body weight, 119.7 ± 25.6㎏) for 426d including 195d for a pasture stage. The animals were fed commercial concentrates at a rate of 0.5％(T1), 1.0％(T2), 1.5％(T3) and 2.0％9T4) of body weight, respectively, for pre- and post-pasture.
1. Mean daily gains by treatments were 0.348, 0.403, 0.450 and 0.501㎏ for T1, T2, T3, and T4, respectively, indicating that increases in concentrates intake was associated with the daily gain of grazing Hanwoo heifers. However, the mean daily gain was the highest for T2 during the pasture stage.
2. TDN intakes per 1㎏ gain were, on average, 8.61㎏ for the entire experimental period and 9.22㎏ for the pasture stage, respectively. In addition, the rate of roughage to concentrate during the entire experimental period was 49.6 to 68.2％(mean 58.5％).
3. Age reached 225 and 250㎏ of body weight was, on an average, 15.1mo. and 17.6mo., respectively, indicating that increasing the level of concentrates feeding9by 0.5％ of body weight) reduced the first pregnancy by 0.9 mo. Ages and body weight for first service were 19.5mo. and 272.2㎏, respectively. Mean pregnant rate of total heads was approximately 52.8％, but appeared to 66.6％ for T3 and T4.
Therefore, it may be concluded that the optimum level of concentrates for autumn born Hanwoo heifers is 1.8％ of body weight for indoor feeding on rice straw-based diet and 1.5％ of body weight for a pasture stage, respectively.
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