Abstract
Although many studies have attempted to determine the effect of goose age on egg weight, the relationship remains unclear. We conducted a meta-analysis of the relevant literature in an attempt to provide clarity on this question. We found that goose egg weight changes with age and that he greatest amount of yolk is produced following the second laying season, after which laying performance tends to decline. However, there was considerable heterogeneity among research study results that appears to be caused by ad libitum feed consumption. Interestingly, there have been no studies on the correlation between goose yolk weight and uterine secretions. These parameters change with age and can be easily evaluated through measurements of goose egg component weight in different laying seasons. Following the meta-analysis, we hypothesize that estrogen is a key factor in determining egg weight. Our findings suggest that poultry farms can adjust feed formulations and the duration of light exposure as geese age to optimize egg production. Estrogen concentrations may also be adjusted through diet supplementation as geese age to increase their productive lifespans.
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