Clutch traits, providing additional insight into the difference between highly productive and inferior layers, were proposed to be integrated into selection criteria of layer chickens and other domestic poultry species. Moderate heritabilities were estimated for clutch length, such as 0.31 in Rhode Island Red (RIR), 0.34 in White Leghorn (WL), and 0.43 in Dwarf brown-egg layers. The meaningful correlation between clutch length or clutch number with egg production has been reported. The clutch length, indicating the number of consecutive days with eggs, is an important trait describing the individual laying pattern and has been investigated in different domestic avian species in recent years. Such a series of eggs laid on successive days was named a clutch. Then the next egg will be laid in the morning again in a new sequence. In a sequence of consecutive days, the first oviposition normally occurs in the morning, and the following oviposition is postponed day by day until a laying cessation for one or more days when the oviposition is postponed to the afternoon. Under the 24 h based light-dark period, the pronounced cyclic process of chickens’ egg formation requires an average a bit over 24 h. Article Sharing (Author Self-Archiving) Policy.Nonruminant Nutrition and Feed Processing.Poultry and Laboratory Animal Nutrition.Ruminant Nutrition and Forage Utilization.
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