Energy allowances and feeding systems for ruminants / Ministry of Agriculture, Fisheries and Food, Department of Agriculture & Fisheries for Scotland, Department of Agriculture for Northern Ireland.

  • Great Britain. Ministry of Agriculture, Fisheries and Food.
Date:
1975
Catalogue details

Licence: Open Government Licence

Credit: Energy allowances and feeding systems for ruminants / Ministry of Agriculture, Fisheries and Food, Department of Agriculture & Fisheries for Scotland, Department of Agriculture for Northern Ireland. Source: Wellcome Collection.

    47/92 (page 37)
    and E, . EWG (6.28 + 0.0188 W) an (1 — 0.30 LWG) then for this energy system, (31) ree LWG (6.28 + 0.0188 W) (1 — 0.3 LWG) (5.67 + 0.061 W) Values for APL at different levels of liveweight (W), and liveweight gain (LWG), are stated in Table 12. At the maintenance level, when LWG = 0, APL. == +1. Table 12 Animal production level Liveweight gain LWG, (kg/day) Liveweight §=|——————_,_-_——_, ——_—_, ——_—__-—— W, (kg) 0:25 | 0-50 | 0-75 | 1-00 | 1:25 | 1-50 100 1:19 | 1:40 | 1-66 | 1-98 150 1:16 | 1-36 | 1-59 | 1-87 200 1:15 | 1-33 | 1:54 | 1-79 | 2-11 250 1:14 | 1-30 | 1-50 | 1-74 | 2-03 300 1:13 | 1-29 | 1-47 | 1-70 | 1-97 | 2-33 350 1:13 | 1-27 | 1-45 | 1-67 | 1:93 | 2-27 400 1:12 | 1-26 | 1:43 | 1-64 | 1-90 | 2-22 450 1-12 | 1°267)°1-42 | 1-62 | 1-87 | 2-18 500 1:11 | 1-25 | 1-41 | 1-60 | 1-84 | 2-15 550 1:11 | 1-24 | 1-40 | 1-59 | 1-83 | 2-13 600 1:11 | 1-24 | 1-39 | 1-58 | 1-81 | 2-13 LWG (6:28 + 0:0188W) (1 — 0:3 LWG) (5:67 + 0-061 W) Based on APL = 1 + NET ENERGY FOR MAINTENANCE AND PRODUCTION In the ME system for beef cattle which has been described the efficiency of utilisation of ME for maintenance (km) is fixed at 0.72, and the efficiency for fattening (k,) is dependent on the ration energy concentration (M/D). k, = 0.0435 M/D (8) Overall efficiency of ME use for maintenance and production (kmp) is therefore variable, depending upon the proportions of ME used for mainten- ance and fattening. It may be defined as the ratio of net energy requirement for maintenance and production, to the total metabolisable energy require- ment (Mmp): eas aay ec ae (18) Mmp Em + Ep (32) Hence kmp Mn+M,