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2120 final report.pdf - Agra CEAS Consulting

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THE SOCIO-ECONOMIC IMPLICATIONS OF THE VARIOUS SYSTEMS TO KEEP LAYING HENSmight achieve. As producers invest in more modern facilities there is likely to be an improvement incertain technical factors (such as the number of birds that can be managed by one labourer, feedconversion ratios, etc.).Each technical factor is considered below:Laying cycle (days): this is the period over which the bird is laying eggs.Empty period (days): the period between flocks during which time the house is thoroughlycleaned.Feed/bird/day (grams): the feed requirement per bird per day.Feed/bird/year (Kg): this is calculated as the feed per bird per day multiplied by the layingcycle and then divided by the sum of the laying cycle and the empty period. This is thenmultiplied by 365 to present the information in terms of feed per bird per year. This calculationtakes account of the fact that a laying house is empty for a proportion of time in any calendaryear and when there are no birds there is no feed requirement.Eggs/bird/year: this is calculated as the number of eggs collected per bird per laying cycledivided by the sum of the laying cycle and the empty period, multiplied by 365 to annualise thedata. The base data for this is generally corrected for mortality in that producers usually dividethe total number of eggs produced in a house by the birds put in at the beginning.Kg feed per kg eggs: this is the feed per bird per year divided by the eggs collected per birdper year multiplied by 16 on the basis that a typical egg weight is 62.5 grams 9 . This figure inannual terms is the same as that in laying cycle terms.Mortality (%): the percentage mortality over the complete laying cycle. It is not possible topresent this figure in annual terms without knowing the distribution of mortality across the layingcycle.Number of hens managed per labourer: there will be a great deal of variation in this figuredepending on the degree of automation possible. The figures provided are ‘typical’ of thecommercial laying sector in each Member State. In some cases laying houses tend to be smalland looking after them would not be a full-time job.Space allowance per hen per cm 2 : the available space per hen. This follows the EU stockingdensity requirements with some exceptions where national legislation has tighter requirements(for example, Sweden) or where national derogations with respect to the requirement ofDirective 1999/74/EC are currently in place (for example, in the UK where barn and free rangesystems may maintain stocking densities for facilities in production prior to August 1999 at 11.7birds per square metre until 2012) 10 .Hens housed per m 2 house: this figure takes account of the use of tiers by presenting howmany hens are housed per square metre of floor space. It is the number of hens per metre(calculated from the space allowance in cm 2 ) multiplied by the number of tiers of cages.9 It should be noted that the source data were collected in per dozen egg terms and that as national egg weights do differ by Member Stateexpressing feed conversion in terms of egg weight may conceal these differences. The average weight of 62.5 grams per egg used for thiscalculation was specified by DG SANCO.10 The Directive specifies that stocking density must be not more than 9 birds per square metre from 2007.20

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