The Effect of Hatching Egg Size on the Early Growth of the Chick, with Special Reference to the Result in the Crossbred

概要

論文の詳細を見る
The present study was conducted to determine the relationship between the growth of chicks and size of eggs, from which they were hatched, in the large meat-type breeds. Prior to incubation, hatching eggs taken from three breeds, White Cornishes, White Rocks, and their crossbreds (F_1s), were classified into six groups based on the individual weight, i. e., 50-53, 54-57, 58-61, 62-65, 66-69, and above 70g, and hatched in a single basket. The batteries controlled for the space per bird were assigned at random to each group of the sexed chicks through the test period. The percentage of chick weight involved both sexes at hatching time to the original egg weight averaged 70.4% for Cornishes, 72.2% for White Rocks, and 73.8% for F_1s. Significantly high correlation coefficients above 0.83 in all the breeds were found between chick weight at hatching time and egg weight. The correlation coefficients in the 2nd-week of age rapidly declined to about 0.35, and thereafter these decreased to the level of 0.1. However, the correlations in White Rocks and F_1s were significant even at the broiler age. The effect of the egg weight to the variances of body weight which were estimated from the formula of ((Σxy)^2/Σx^2)/Σy^2=r^2 were 70% at hatching time, but these abruptly decreased to below 17% after two weeks of age. Thus, effect of the original egg weight on the chick growth, maternal effect, mostly vanishes at 6 weeks after hatching, but the effect in the F_1s may remain at 10 weeks of age.
横浜国立大学の論文
1971-12-28

The Effect of Hatching Egg Size on the Early Growth of the Chick, with Special Reference to the Result in the Crossbred

スポンサーリンク

概要

著者

関連論文

スポンサーリンク