The Differences Among Lines on Oviduct and Cumulative Follicle Weight in Laying Hens.
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概要
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This study was conducted to examine the differences on the physical measurements of oviduct and cumulative follicles in laying hens. The data were obtained from the hens of the two lines founded by a long-term selection for high and low yolk-albumen ratio (H and L) and from the hens of other two commercial lines (J and X). Oviposition time and laying cycle were observed at 400 days of age. The hens that had laying cycles of 24-25 hours were selected and slaughtered at the time when there was an egg in magnum. This egg was predicted by the time of the preceding oviposited egg. Oviduct and ovary were removed and measured for weight and length. Only the hens having an egg at centre of magnum were used in this analysis.Weight and length of oviduct, especially those of magnum, in the commercial lines were significantly larger than those in the selected lines. However, when adjusted for body weight, oviduct weight of the L line was the same as the commercial lines. The correlation coefficients between magnum weight, magnum length and albumen weight were relatively high and positive (especially higher than 0.70 in the L line). The smallest number of follicles (5.8) was found in the L line. However, the number of follicles in the H line was about 1 follicle less than in the commercial lines. The rapid developing follicles were found at 6-7 and 5-6 days before ovulation expected for the commercial and selection lines, respectively. Further, cumulative follicle weight per day in the H line was higher than that in the L line from day 5 after ovulation expected, moreover, was higher than that in the commercial lines from day 2.
- 日本家禽学会の論文
日本家禽学会 | 論文
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