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임종우,유제현 한국낙농학회 1983 韓國酪農學會誌 Vol.5 No.2
A series of experiment was conducted to study the milk producing capacity and the physicochemical properties of Korean cow's milk. Three heifers weighing 255.4㎏ of average body weight on normal level (H-N), 3 cows weighing 317.8㎏ of average body weight on low level (C-L) and 3 cows weighing 320.0㎏ of average body weight on normal level (C-N) based on the requirements of suckling beef cattle in NRC (1976) were raised for experimental period. Experiment I was carried out to investigate the effects of nutritional level on milk yield and milk constitutents of heifers and cows on the experimental diets during lactation. Also lactation curves of H-N, C-L and C-N on the experimental diets were established by Wood'a method (1969). The results obtained are summarized as follows: 1. Average daily milk yields of H-N, C-L, C-N and all the groups per cow were 1.496. 1.583, 1.781 and 1.620㎏ respectively. There were no significant differences in daily milk yield between H-N and C-L, C-L and C-N but significant difference (P< 0.01) between H-N and C-N. 2. The maximum and minimum milk yields of H-N, C-L and C-N were 504.7O and 273.35kg, 614.53 and 297.80㎏ and 705.65 and 350.46㎏, respectively. Average milk production performance of H-N, C-L, C-N and all the groups during lactation period were 317.00, 408.41, 482.12 and 420.51㎏, respectively. Actually peak daily yield of H-N, C-L and C-N were 4.50, 4.70 and 5.25㎏, respectively. The expected days reaching to the peak daily yield, and maximum daily yield in the lactation curves of H-N, C-L, C-N and all the groups were 26.91 days and 2.82㎏, 41.59 days and 3.29㎏, 33.52 days and 3.34㎏, and 34.43 days and 3.09㎏, respectively. 3. Within 12 weeks of lactation H-N, C-L and C-N produced more than 50% of milk yield in one lactation period, respectively. There were significant differences (P < 0.05) in weekly milk yield by the 12th,16th and 24th week of lactation between H-N and C-N. 4. The shortest and the longest laction periods of H-N, C-L and C-N were 217 and 280, 248 and 284, and 234 and 296 days, respectively. Average lactation period of H-N, C-L, C-N and all the groups were 248.0, 258.0, 270.7 and 258.9 days, respectively. 5. The average content of moisture, TS, SNF, fat, protein, lactose and ash in milk were 86.49, 13.51, 9.03, 4.48, 4.00, 4.32 and 0.71% in H-N, 86.94, 13.06, 8.97, 4.09, 3.84, 4.43 and 0.70% in C-L, 87.27, 12.73, 8.81, 3.92, 3.70, 4.42 and 0.69% in C-N, and 86.90, 13.10, 8.94, 4.16, 3.85, 4.39 and 0.70% in all the groups, respectively. There were significant differences (P < 0.05) in moisutre, TS, fat, protein and ash between H-N, C-L and C-N. 6. The lactation curve equations of H-N, C-L, C-N and all the groups were as follows: (수식)
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