Milk urea as indicator for Low Nitrogen Feed in Dairy husbandry

1
Milk urea as indicator for Low Nitrogen
Feedin Dairy husbandry
2
The new focus is on housing
3
(No Transcript)
4
Emission factors for Dairy cow housings

• Ammonia volatilization
• During winter (200 days) 7.1
• During summer (165 days) 17.4
• Effectively 11.7
• According RAINS
• Option SA

animal house storage application grazing
10.5 1.04 - -
5
Low Nitrogen Feeding dairy cattle

• Relates to
• Nitrate Directive
• N excretion
• Max 170/250 kg N per hectare animal manures
• National Emission Ceiling Directive
• Ammonia emission
• Max 128 kiloton NH3 in the Netherlands

6
Practical policy implication

• N manure per dairy cow by default
• N 138.5
• 0,0055 ( MY 7482 ) 2,4 ( MU 26 )
• Correction for
• milk yield (MY in kg) and
• ureum content of milk (MU in mg per 100 g milk)

7
Emission factors LNF

• Current Milk Ureum average is 26 mg per 100 g
  milk
• Milk ureum target is 20 mg per 100 g milk
• So, 2,4 (26-20)14,4 kg N
• Relatively 14,4/138,5 10
• EB.AIR/WG.5/1999/8 Rev.1 reads
• Removal effiency 15

animal house storage application grazing
15 15 15 15
8

• However, farmers find it easier more economic -
• to shed their cows year-round
• using milk ureum to monitor milk quality and
  environmental pollution
• year-round will increase ammonia emissions
  substantially

Removal effiency -23
animal house storage application grazing
-33 -33 -33 100
9
Low Nitrogen Feeding dairy cattle

• Potential reduction 3,7 kiloton NH3
• In the sandy soil region
• 1,7 kiloton NH3 at 5 million
• Cost effectiveness
• LNF 3 per kg NH3
• housing 5 per kg NH3
• Alternative increase grazing
• Alternative decrease use of nitrogen fertlizer
• Alternative improve housing
• Alternative

10
Bron MCS-Nederland
The proceedings
11
Bron MCS-Nederland
The proceedings
12
Bron MCS
13
Bron MCS
14
(No Transcript)
15
(No Transcript)
16
(No Transcript)
17
conclusion

• National target for Low Nitrogen Feed seems out
  of reach
• Sandy soil easier than peat/clay region
• Low Nitrogen Feed should not lead to year-round
  shedding of cows
• Ammonia up by 23 in stead of down 15

18
(No Transcript)
19
calculation
removal efficiency of the abatement option 'low nitrogen feed' in the dairy cow sector removal efficiency of the abatement option 'low nitrogen feed' in the dairy cow sector removal efficiency of the abatement option 'low nitrogen feed' in the dairy cow sector removal efficiency of the abatement option 'low nitrogen feed' in the dairy cow sector removal efficiency of the abatement option 'low nitrogen feed' in the dairy cow sector removal efficiency of the abatement option 'low nitrogen feed' in the dairy cow sector removal efficiency of the abatement option 'low nitrogen feed' in the dairy cow sector removal efficiency of the abatement option 'low nitrogen feed' in the dairy cow sector removal efficiency of the abatement option 'low nitrogen feed' in the dairy cow sector removal efficiency of the abatement option 'low nitrogen feed' in the dairy cow sector
per animal per year
nitrogen manure (kg N) nitrogen manure (kg N) nitrogen manure (kg N) nitrogen manure (kg N) nitrogen manure (kg N) ammonia volatilization (kg NH3) ammonia volatilization (kg NH3) ammonia volatilization (kg NH3) ammonia volatilization (kg NH3)
option total house house meadow meadow house storage appl grazing total
14 5 34 7
current 126 81 81 46 46 14 4 27 4 49
LNF and no grazing 107 107 107 0 0 18 6 36 0 60
LNF and current grazing 107 68 68 39 39 12 4 23 3 42

removal efficiency
LNF and no grazing 15 -33 -33 100 100 -33 -33 -33 100 -23
LNF and current grazing 15 15 15 15 15 15 15 15 15 15

based on RAINS data for the Netherlands based on RAINS data for the Netherlands based on RAINS data for the Netherlands based on RAINS data for the Netherlands