Abstract
The day old chick quality has a great importance for hatcheries and also broi ler producers. It is an indicator of hatchery success and assuranc e of broiler productivity. Chick quality is affecte d by a number of factors from the time of fertilizati on to placement time at broiler houses. Generally, these factors are classified as pre-incubation and incibation factors. These factors affects embryo development and chick quality, and in this way post -hatch broiler performance. Day old chick quality is assessed by considering some parameters as colou r, vitality, navel quality, yolk uptake, leg confirmation, well formed beak, chick hatching weight, yolk free body weight and chick length. While some of these parameters are qualitative, oth ers are quantitative characteristics of chicks. Because of assessing of qualitative parameters, som e scoring systems have been developed to convert these factors into a quantitative score. Fort his r eason, visual scoring, Tona or Pasgar score, day ol d chick weight, yolk free body weight and chick lengt h are used largely for measurement chick quality. In this review, definition of the day old chick qua lity, effecting factors and also scoring methods ar e explained.
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