Defective eggs and their relationship to egg yield, egg and body weight in hens of five original laying lines
2004
Machal, L. (Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Agronomicka Fakulta) | Jerabek, S. | Zatloukal, M. | Strakova, E.
We investigated 3,985 individually housed hens of five original laying lines of two breeds RIR and BPR. The proportion of abnormal eggs out of the eggs laid before the age of 240 days ranged between 7.0 and 9.7 %, in dependence on the line. The average number of cracked eggs ranged between 2.5 and 4.4 %, double-yolk eggs between 2.2 and 3.0 % and shell-less eggs between 2.0 and 2.7 %. Low but statistically significant and positive correlations were found between the number of eggs laid and the frequency of double-yolk eggs, the number of eggs laid and the frequency of shell-less eggs, whereas negative correlations were calculated between the number of eggs laid and the frequency of cracked eggs. Statistically significant and positive correlations were also found between the individual types of abnormal eggs. With the increasing weight of eggs the frequency of abnormal eggs increased.
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