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한우 미경산우에 대한 난소적출이 발육 및 도체형질에 미치는 영향
원유석,박노형,정준,정재경,임연수,박종관,이문걸 한국축산학회 1999 한국축산학회지 Vol.41 No.5
Five intact control(IC) and 5 ovariectomized heifers(OVX), born in the Livestock Improvement Main Center of National Livestock Co-operatives Federation, were used to study the effects of ovariectomy on growth and carcass traits. Ovariectomy was performed surgically at an average of 6 months old via an incision through the left lumbar fossa area. All heifers were fed concentrates and rice straw based on NLCF's feeding program. Heifers were slaughtered at an average of 24 months old and carcass traits were investigated according to the standard of the Animal Product Grading Service. Physical traits and chemical contents including fatty acids composition and cholesterol concentration in M. longissimus dorsi muscle were examined. Though feed intakes were not different, average daily gain of OVX was higher about 8.4% than that of IC, resulting in improved feed efficiency. The pH of the strip loin from OVX was higher than that of IC(OVX vs IC : 5.43 vs 5.36, P$lt;0.05), however, lowered in cholesterol content(OVX vs IC : 81.76 vs 89.36). Ovariectomy did not affect on tenderness and cooking loss but water holding capacity of the strip loin was higher than IC. Contents of myristic acid, palmitic acid, palmitoleic acid, stearic acid and oleic acid tended to be decreased by OVX, in contrast, linoleic acid was increased. Meat production index(MPI) and meat quality gade(MQG) were not influenced by ovariectomy. All of the OVX got lst grade in the carcass quality grade. Though an ovariectomy was little beneficial effects to improve the MPI and MQG items, overall meat quality grade of OVX was better than IC.