Data collected on a group of hens will only be applicable to that group. So, if you want data on individual hens, you have to house them separately. Egg production percentage of the group will be a combination of pause days and hens not laying eggs at all. Sometimes these individuals can be easily spotted, but others (sometimes so called jnternal layers) are almost impossible to identify by external features.

than you for your response

really I want to calculate the pause days in each group as the number of eggs produced subtracting from the number of laying hens within the same group. so we will have 30 estimation per month which can treated them statistically to get a mean and standard deviation in each month of production

if it possible please told me as soon as possible

It seems to me, that in that way you just calculate the average laying (apparent) percentage of each group.

If for some reason (treatment related or not) some hens lay their eggs outside the laying nests or eat their eggs, you will not collect those eggs, so your calculations are compromised by those facts.

At present I do not understand why you want to calculate pausing days instead laying percentage to compare groups.

It is erroneous to calculate the no.of pause days in deep litter system,the reason being, unidentified non layers in the course of investigation, actual non layers in previously identified laying hens , disease factors,-morbidity and mortality-,. Hens may hv.to be kept in groups over the period of study, and pause period averaged

over groups. Birds studied while being kept in individual cages, offer the best scope for this type of study

There is no relationship between the rest period or the chicken stops for eggs and the thickness of the mattress, but the mattress affects the performance of chicken if it is unhealthy, disturbed and moist and contains pathological causes and reflected on the performance of birds

Individual cages are being opposed on various grounds. On deep litter, it is true that non-layers and internal layers do affect the laying % or, in other words, pause durarion.

One of the methods would be to wingbadge each layer and train the flock for trap-nesting with nests installed on the litter at 30% of the number of birds. In this way, data on layers will be available. Number of floor-eggs and/or broken eggs on the floor can be recorded alongside the layer-identified eggs. With this, bird-wise (those which were trap-nested) egg production % can be calculated (both bird-wise as well of the flock) which when averaged over a reasonable period of time (say 100 days or so, whichever is convenient) can give the % days of no eggs or pause; the latter can easily be converted to pause days (both bird-wise and for the flock).

Alternatively, the floor-eggs and broken eggs can be added to daily production regardless of the trapped birds (in this case, trap-nesting not required), calculate daily flock egg production % over a reasonable period of time (say 100 days or so, whichever is convenient). Then, daily pause days or average pause days can be easily calculated as explained above.

In either case, the result is applicable to the batch of birds in study, or, at the best, to the strain/line/breed that was reared.

IMPORTANT: FOR BOTH THE ABOVE, DATA SHOULD BE COLLECTED AFTER THE FLOCK ATTAINS 50% EGG PRODUCTION WHEN IT WILL BE REASONABLE TO ASSUME THAT EACH BIRD HAS PRODUCED AT LEAST ONE EGG; THIS REDUCES ERROR DUE TO NON-LAYERS. IDENTIFICATIION AND REMOVAL OF NON-LAYERS MUST BE UBDERTAKEN ON DAILY BASIS BY CAREFUL OBSERVATION TO INCREASE THE ACCURACY OF RESULTS.