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지방 첨가와 bST 주사가 비육말기 한우의 생산성 , 혈청 대사물질 및 호르몬에 미치는 영향
곽병오 ( B O Kwak ),하종규 ( J K Ha ),장병선 ( B S Chang ) 한국축산학회 1995 한국축산학회지 Vol.37 No.2
This study was conducted to investigate the effect of dietary fat on the efficacy of bovine somatotropin(bST) administration in finishing Korean Native Cattle(KNC). Administration of bST to animals a fed control and a fat supplemented diet decreased dry matter intake(DMI) by 7 and 4% respectively(P$lt;.01), increased average daily gain(ADG) by 12%(P$lt;.05), and decreased feed: gain ratio by 17 and 14% respectively(P$lt;.01). But there was no significant interaction between dietary fat and bST effect on the growth performance. Administration of bST to KNC tended to increase the concentration of serum glucose, but dietary fat did not. On days 4 and 7 after treatment, the concentration of serum glucose of the control diet group tended to increase (P$lt;.10). The concentration of serum non-esterified fatty acid(NEFA) tended to increase with administration of bST, and dietary fat also tended to increase it. With administration of bST, the concentration of semm NEFA increased in fat diet group on days 7 and 21 after treatment(P$lt;.01), and it also tended to increase in the wntrol diet group(P$lt;.10). Serum concentration of total protein and urea tended to decrease with administration of bST, but dietary fat did not effect these concentrations. On day 7 after treatment, the concentration of serum urea of the fat diet group decreased with bST administration(P$lt;.01). Also bST and dietary fat did not affect serum concentrations of cholesterol, albumin, globulin, calcium, phosphoms and magnesium. Bovine somatotropin dramatically increased the concentration of serum bST during the first 2 weeks of treatment, but dietary fat did not. The concentration of serum bST increased in both the control and the fat diet on days 1, 4 and 7 after treatment by bST administration(P$lt;.05). The concentraion of serum insulin-like growth factor- I (IGF-I) tended to peak on days 4 to 7 after treatment, and progressively decreased until day 14 after treatment. On days 1, 4, 7 and 10 after treatment, the concentration of serum IGF-I in both the control and the fat diet groups increased due to bST administration(P$lt;.01). On day 21 after treatment, the concentration of serum IGF-I also increased in the control group by bST administration(P$lt;.01), and tended to increase in the fat diet group(P$lt;.10), but dietary fat did not affect the concentration of serum IGF-I.
거세와 bST 주사가 비육말기 한우의 생산성과 육질에 미치는 영향
곽병오 ( B O Kwak ),하종규 ( J K Ha ),장병선 ( B S Chang ) 한국축산학회 1995 한국축산학회지 Vol.37 No.3
This study was conducted to determine the effect of castration and bovine somatotropin(bST) administration on growth performance and carcass characteristics of finishing Korean Native Cattle. Bovine somatotropin decreased dry matter intake(DMI) of bulls by 10%(P$lt;.01), but DMI of steers was not affected by bST administration. Bovine somatotropin increased average daily gain(ADG) by 12%(P$lt;.05) and decreased feecl:gain ratio of bulls and steers by 18 and 13% respectively(P$lt;.01 and P$lt;.05. respectively). Steers had decreased DMI and ADG by 9 and 17% respectively(P$lt;.01), but had increased feed:gain ratio by 9%. compared with bulls(P$lt;.05). There was an interaction between castration and bST in DMI(P$lt;.01). The response to bST on growth performance was greater for bulls in the earlier part than in the later part of experiment with an opposite response being observed in steers. Bovine somatotropin increased dressing percentage with a greater response in steers(P$lt;.05), but it did not affect other carcass characteristics or carcass grade. Marbling scores and texture of meat o1 stem were higher than those of bulls(P$lt;.01). Backfat thicknesses near the rib area I and 2 of steers were higher than those of bulls (P$lt;.OS and P$lt;.01 respectively). Meat of steers tended to be graded better quality grade than bulls, and all steers were graded quality grade I regardless of bST administration