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Effects of concentrate feeding levels by growth-stage on the body weight change and the reproductive performance of Korean native heifers


Effects of concentrate feeding levels by growth-stage on the body weight change and the reproductive performance of Korean native heifers



Korean Journal of Animal Nutrition and Feedstuffs 20(2): 136-146



This study was conducted to investigate die effect of concentrate feeding levels(H: 1.0% of apparent body weight in concentrate and full feeding of roughage, L: full feeding of roughage only) by growth-stage(6 to 12, 12 to 18 and 18 to 24 month of age) on the body weight gain and reproductive performance. Feeding trial was conducted with 4 treatment groups(T-1, L-L-H; T-2, L-H-H; T3, H-LH and T-4, H-H-H) for 540 days, consisting of 40 spring born Korean native female calves which initially weight was about 126.8 kg. The results obtained are summarized as follows; The average body weight at 6, 12, 18 and 24 months of age by treatments were 124.2 to 129.8(average 126.8), 168.6 to 209.0(average 187.6), 213.8 to 276.4(average 250.5) and 278.0 to 351.2kg(average 323.4kg), respectively, and their body weights increased with the level of concentrate feeding. During the total experimental period, average daily gains by treatments ranged from 0.29 to 0.42kg(average 0.37kg) and higher in the order of T-4, T-2, T-3 and T-1. TDN intakes required per unit of kilogram gain and the rate of roughage to concentrate by treatments were 10.53 to 12.67kg(average 11.31kg) and 69.6 to 87.9%(average 77.1%), respectively, and the former were lower in the order of T-4, T-2, T-3 and T-1, but the latter were higher in the order of T-1, T-3, T-2 and T-1, respectively. The feed efficiency increased with the level of concentrate feeding. The ages at puberty, first conception and parturition by treatments were 14.6 to 17.1(average 15.7), 17.6 to 22.1(average 19.5) and 26.9 to 31.0 months(average 28.7 months), respectively, and the body weight were 209.5 to 237.5(average 230.0), 260.1 to 272.3(average 266.2) and 344.1 to 382.9kg(average 372.5kg), respectively, and the ages at puberty, first conception and parturition were shorter and the body weight were heavier by increasing the level of concentrate feeding. In all treatment groups, increase rate of body measurements were higher in the order of chest width, hip width and pelvis width, and the rate of body length and wither height to body weight increased with the level of concentrate feeding. Income were higher in the order of T-4, T-2, T-3 and T-1, and income of T-4 was increased by 15%, compared with that of T-1. It was concluded that Korean native heifers could be raised under full feeding of mixed grass hay through all 4 seasons outdoors, but it was desirable that high energy concentrate would be added at about 1.0% of apparent body weight for the improved reproductive performance.

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