The product owner prioritizes product backlog items based on which are needed soonest. The team then chooses which items they can complete in the coming sprint. On the scrum board, the team moves items from the product backlog to the sprint backlog, which is the list of items they will build. Conceptually, it is ideal for the team to only select what they think they can accomplish from the top of the list, but it is not unusual to see in practice that teams are able to take lower-priority items from the list along with the top ones selected. This normally happens because there is time left within the sprint to accommodate more work. Items at the top of the backlog, the items to work on first, should be broken down into stories that are suitable for the development team to work on. The further down the backlog goes, the less refined the items should be. As Schwaber and Beedle put it "The lower the priority, the less detail, until you can barely make out the backlog item." 
two experiments were carried out to estimate sodium requirements for brown-eggs laying hens in the late first and during second egg-production cycle. a completely randomized design was used, with seven sodium levels (, , , , , and %), six replications of six birds in the late first egg-production cycle and five replications of six birds in the second egg-production cycle. in the late first egg-production cycle, sodium levels (sl) had no effect on feed intake (fi), egg weight (ew), egg dozen feed conversion (edc) and egg-shell specific gravity (sg). the sl showed quadratic effect on egg production (ep), egg mass (em) and egg mass feed conversion (emc), that resulting in sodium requirements (sr) of , and %, respectively. in the second egg-production cycle, sl had no effect on ew and sg. however, ep, em, emc and edc improved when the levels of sodium were , , and %, respectively. considering the estimates of sodium requirements to egg production and egg mass feed conversion, could be suggests % e % as maximum sodium levels, respectively, to late first and second egg-production cycle.