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.

  • 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.

    34/92 (page 24)
    Weeks 10-20, mid lactation Peak milk yield of 25 kg will have been achieved and will begin to decline at about 2.5% each week. Liveweight loss should be brought to an end and dry matter appetite will be maximal. Thus M, = 123 MJ reducing to 99 MJ for 20 kg milk (Table 2) M, — 0 ME allowance = 63 + 123 = 186 MJ reducing to 162 MJ DMI = 0.025 W + 0.1 Y = 17.5 kg DM/day (Table 6) 186 M/D = = fe 10.6 MJ/kg DM FD = 9.5 kg/day of forage DM CD = 8.0 kg/day of compound DM The forage is now supplying 9.5 x 9 = 86 MJ of ME daily equivalent to maintenance and 4.7 kg of milk. Using the liveweight change pattern suggested earlier, the results of similar calculations for the various stages of lactation of a cow are given below. Table C Rations for various stages of lactation of typical Friesian cow Total Com- Com-| DM | Com-| pound Week | Milk | Livewt | DM | ME Forage | pound! supp- | pound| per kg number] yield gain | intake |reqd| M/D DM DM | lied |asfed| milk (kg) (kg) (kg) |(MJ)|(MJ/kg)) (kg) | (kg) | (kg) | (kg) | (kg) = | | ——_— ———_—_—___ —_ 0-10 | 15-25 | — 0:5 ES:0u 217271 See le 4-3 107, 215-07 el 220 49 10-20 2 0 17:5 | 186} 10.6 ie) $0 F125 9-15 100-36 20-30 20> 15-2025 LTO SE UT ft) sel 034 10:2 6:8 | 17:0 dtu 039 30-40 if ents) 1652 igl52 9:2 10-0* a.05 1215-0 O77 tn 738 40-50 LOPe e007) et O-On 13) 8°4 10-0* 2°60 113-6 4-1 | 0-41 *Forage restricted to 10 kg DM/day voluntary intake as silage. FEEDING RATES FOR FEEDING ACCORDING TO YIELD Whilst there is evidence that feeding according to yield in the strictest sense is not really necessary, it is still a widespread method of deciding food allocations for cows. Feeding rates which are in accordance with the ME allowances of cows, assuming standard dairy compound food has an ME of 11 MJ/kg as fed, are as follows: Friesian milk 0.44 kg/kg milk Ayrshire milk 0.46 kg/kg milk Channel Island milk 0.54 kg/kg milk 0.44 kg/kg milk is equivalent to 4.5 lb/gallon of milk.