Effects of supplemental zinc on fattening performance and meat quality of Japanese Black steers
2007
Takizawa, H.(Aichi-ken. Agricultural Research Center, Nagakute (Japan)) | Morishita, M. | Sakakibara, T. | Ishii, K.
Seven Japanese black steers were used to examine the effect of zinc feeding on fattening performance and meat quality. The experimental period was during 15-17 months from 13 to 28-30 months of age. Two steers of organic zinc group fed zinc methionine (400mg as zinc) and two steers of inorganic zinc group fed zinc carbonate (800mg as zinc) per day from 15 months of age to the day before slaughter. Three steers of control group were fed no supplemental zinc. The results obtained are summarized as follows: 1. Both zinc groups showed higher dry matter intake than that of control group. 2. Both zinc groups of the dressed carcass weight were significantly higher than that of control groups. 3. The beef marbling standard number of organic zinc group was higher than those of the other groups. The loin eye area of inorganic zinc group was significantly larger than those of the other groups. 4. The rate of unsaturated fatty acid in the fat between loin eye area and rib in zinc groups were higher than that of control group. 5. The serum zinc in the inorganic zinc group during experimental period was significantly higher than that of the other groups. 6. The profit of the zinc fed groups were 100,000-120,000 yen higher than that of the control group. These results suggest that feeding either form of zinc in Japanese black steers were effective for body weight gain and especially zinc methionine is useful for meat qualities.
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