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거세한우에 대한 제한급여 수준과 출하체중이 비육능력 및 육질에 미치는 효과
홍성구(S . K . Hong),백봉현(B . H . Baek),강희설(H . S . Kang),조원모(W . M . Cho) 한국축산학회 1996 한국축산학회지 Vol.38 No.3
A study was conducted with 63 Hanwoo steers weighing 120㎏ to investigate the effect of restricted feeding (Restricted feeding I, feeding concentrates at the levels of 1.0% and 1.5% of live body weight during growing stage and finisher stage I, respectively; Restricted feeding B, feeding concentrates at the levels of 1.5% and 2.0% of live body weight during growing stage and finisher stage I, respectively) and market weights(550, 600 or 650㎏) for 600 days on carcass composition, and quality and yield traits of Hanwoo steers. Results observed from the study were summarized as follows : Level of feeding the concentrates influenced body weight by age and daily gain for every growing stage, this results were due to the difference between reduced growth rate of cattle fed ad libitum during finisher stage II and rapidly increased growth rate of cattle raised by Restricted feeding I during same period(P$lt;.0001). An improved body weight by feeding ad libitum increased(P$lt;.0045) dressing percentage while decreased(P$lt;.0049) retailed cuts(%) between feeding ad libitum and Restricted feeding I. No differences, however, in retailed cuts(%) and body fat(%) were observed between Restricted feedings. Degree of marbling of Longissimus muscle tended to improve as body weight of greater than 600㎏ increased, but the difference(P$lt;.0014) was observed only between feeding ad libitum and Restricted feeding I. However, high grade of beef quality was observed from the steers heavier than 550㎏. The size of Longissimus muscle increased(P$lt;.0011) with body weight, but was not influenced by the level of feeding. Backfat thickness was also affected by body weight, and this was mainly due to the difference(P$lt;.0366) between feeding ad libitum and restricted feedings. But no tendency was observed between Restricted feeding I and Restricted feeding II. Moisture content(%) of Longissimus muscle was decreased(P$lt;.0267) at the body weight range of 550-600㎏ of Hanwoo steers. Restricted feedings of steers increased(P$lt;.0011) moisture of Longissimus muscle while decreased (P$lt;.0011) fat. Reduced(P$lt;.0001) Shear force but increased(P$lt;.0001) water holding capacity were observed from increased body weight, and this result was from the difference between feeding ad libitum and restricted feedings. No difference was, however, observed between restricted feedings. No clear differences in most cut meat production(%) except for tender loin(P$lt;.0183) and rib loin(P$lt;.0005) increased by restricted feedings. Difference in cut meat production was not also observed between restricted feedings.