成年体重 700 千克后备青年母牛的日粮营养特点
Body Weight, kg | |||||
|---|---|---|---|---|---|
112 | 224 | 336 | 420 | 560 | |
BW as % of mature body weight | 16 | 32 | 48 | 60 | 80 |
DMI, kg/d | 3.3 | 6 | 8 | 9.3 | 10.9 |
Concentrates, % of dry matter | 40 | 30 | 10–20 | 0–5 | 10–20 |
Forage, % of dry matter | 60 | 70 | 80–90 | 95–100 | 80–90 |
Metabolizable energy (Mcal/kg diet) | |||||
ADG = 700 g/d | 2.5 | 2.1 | 2.1 | 2.1 | 2.5 |
ADG = 840 g/d | 2.7 | 2.3 | 2.2 | 2.2 | 2.7 |
ADG = 980 g/d | 2.9 | 2.4 | 2.3 | 2.3 | 2.8 |
Metabolizable protein (% of dry matter) | |||||
ADG = 700 g/d | 416 | 573 | 679 | 732 | 939 |
ADG = 840 g/d | 448 | 610 | 718 | 772 | 979 |
ADG = 980 g/d | 481 | 646 | 758 | 813 | 1020 |
Crude protein (% of dry matter) | |||||
ADG = 700 g/d | 19.5 | 15.4 | 13.6 | 12.7 | 13.5 |
ADG = 840 g/d | 21.5 | 16.4 | 14.4 | 13.4 | 14.1 |
ADG = 980 g/d | 23.1 | 17.4 | 15.2 | 14.1 | 14.7 |
Abbreviations: ADG, average daily gain; BW, body weight; DMI, dry-matter intake. Modified, with permission, from National Academies of Science, Engineering, and Medicine (NASEM). Nutrient Requirements of Dairy Cattle. 8th rev ed. The National Academies Press; 2021. doi:10.17226/25806 | |||||
