Phenotypic Correlations Between Egg Quality Traits Amid the Laying Phase of Broiler Breeder Hens

M. Vekić, Đ. Savić, S. Jotanović
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Abstract

Summary In order to determine phenotypic correlations between the quality traits of eggs from 41-week-old broiler breeder hens (Cobb 500), a total of 105 eggs suitable for incubation were analyzed using descriptive statistics and Pearson’s correlation coefficient. The average values of egg weight, egg length, egg width, egg shape index, shell thickness, shell weight, and shell ratio were 66.90 g, 60.00 mm, 44.81 mm, 74.70%, 0.37 mm, 6.07 g, and 9.07%, respectively. Moreover, the average values of yolk weight, albumen weight, yolk ratio, albumen ratio, Haugh units, yolk index, and yolk-to-albumen ratio were 20.04 g, 40.80 g, 29.97%, 60.95%, 82.12, 46.17%, and 0.49, respectively. A significant positive correlation (p < 0.01) was found between the egg weight and the egg length (0.75), egg width (0.80), shell (0.55), yolk (0.60), albumen weight (0.91), and albumen ratio (0.25). However, a significant negative correlation (p < 0.01) was found between the egg weight and both the yolk ratio (-0.20) and yolk-to-albumen ratio (-0.23). The egg shape index proved not to be significantly correlated with any of the internal egg quality traits considered. The shell thickness was in a significant positive correlation (p < 0.01) with the shell weight (0.83) and ratio (0.86), whereas a significant negative correlation (p < 0.05) was found between the shell thickness and yolk ratio (-0.23). The Haugh units were in a significant positive correlation (p < 0.05) with the albumen ratio (0.24) and yolk index (0.27), whereas a significant negative correlation (p<0.05) was found between the Haugh units and both the yolk ratio (-0.22) and yolk-to-albumen ratio (-0.23). The results obtained confirm significant phenotypic correlations not only between egg weight and the egg quality traits considered, but also between a number of external and internal quality traits of broiler hatching eggs.
肉种鸡产蛋期蛋品质性状的表型相关性
为了确定41周龄Cobb 500肉用种鸡鸡蛋品质性状之间的表型相关性,采用描述性统计和Pearson相关系数对105个适宜孵化的鸡蛋进行了分析。蛋重、蛋长、蛋宽、蛋形指数、壳厚、壳重和壳比的平均值分别为66.90 g、60.00 mm、44.81 mm、74.70%、0.37 mm、6.07 g和9.07%。蛋黄重、蛋白重、蛋黄比、蛋白比、哈夫单位、蛋黄指数和蛋黄蛋白比的平均值分别为20.04 g、40.80 g、29.97%、60.95%、82.12、46.17%和0.49。蛋重与蛋长(0.75)、蛋宽(0.80)、蛋壳(0.55)、蛋黄(0.60)、蛋白重(0.91)、蛋白比(0.25)呈极显著正相关(p < 0.01)。但蛋重与蛋黄比(-0.20)和蛋黄蛋白比(-0.23)均呈极显著负相关(p < 0.01)。蛋形指数与所考虑的任何内部品质性状均无显著相关。蛋壳厚度与蛋壳重(0.83)和蛋黄比(0.86)呈极显著正相关(p < 0.01),与蛋黄比(-0.23)呈极显著负相关(p < 0.05)。哈氏单位与蛋白比(0.24)和蛋黄指数(0.27)呈显著正相关(p<0.05),与蛋黄比(-0.22)和蛋黄蛋白比(-0.23)呈显著负相关(p<0.05)。结果证实了蛋重与所考虑的蛋品质性状之间存在显著的表型相关性,而且在肉鸡孵化蛋的许多外部和内部品质性状之间也存在显著的表型相关性。
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