Department of Animal Science, Faculty of Agriculture, Damascus University, Damascus 30621, Syria.
Poult Sci. 2009 Dec;88(12):2712-7. doi: 10.3382/ps.2009-00069.
An experiment was conducted to determine the effect of time of oviposition, generally representing different positions in the normal egg laying sequence, on egg weight loss during storage and incubation, and on fertility and fertile hatchability of eggs from mid-lay (42 wk) and old (67 wk) broiler breeders. A total of 1,800 eggs (900 eggs per flock age) were collected during 10 consecutive days between 0830 and 1830 h each day. The eggs were individually marked, weighed, and stored for 1 to 10 d before incubation was initiated. Egg weight remained less from collection through incubation for eggs from the mid-lay flock than those from the old flock. Fresh weight of early laid (first-in-sequence; C1) eggs was significantly greater than that for the middle-of-day laid (mid-sequence; Cs), or late-in-day laid eggs (terminal-in-sequence; Ct). Percentage of egg weight loss during storage did not differ significantly between the mid-lay and old flocks but percentage of weight loss in the mid-lay flock was greater during incubation. Egg weight loss during storage of eggs from the middle-of-day laid (Cs) eggs was significantly greater than for early laid (C1) eggs, which was greater than for the late-in-day laid (Ct) eggs. Fertility was significantly decreased due to flock age but not due to oviposition time. Fertile hatchability was also significantly decreased due to flock age, but there was no significant effect of oviposition time. Early and late dead embryos increased with flock age, but there was no significant effect of oviposition time. It was concluded that there was no effect of oviposition time on fertility or fertile hatchability even though there were significant differences in egg weight and egg weight loss during storage due to oviposition time.
进行了一项实验，以确定产卵时间（通常代表正常产卵顺序中的不同位置）对贮存和孵化过程中蛋重损失的影响，以及对从中期（42 周龄）和老年（67 周龄）肉鸡种鸡产蛋的受精率和受精孵化率的影响。在每天 0830 至 1830 之间的连续 10 天内，共收集了 1800 枚鸡蛋（每个鸡群年龄 900 枚鸡蛋）。鸡蛋被单独标记、称重，并在开始孵化前贮存 1 至 10 天。从中期鸡群收集的鸡蛋在整个孵化过程中的蛋重损失比老年鸡群的鸡蛋少。早期（第一个入孵；C1）鸡蛋的新鲜重量显著大于中午（中间序列；Cs）或傍晚（最后入孵；Ct）入孵的鸡蛋。贮存期间的蛋重损失百分比在中鸡群和老鸡群之间没有显著差异，但中鸡群的损失百分比在孵化过程中更大。中午入孵的鸡蛋（Cs）在贮存期间的蛋重损失显著大于早期入孵的鸡蛋（C1），而晚期入孵的鸡蛋（Ct）的蛋重损失则更大。由于鸡群年龄，受精率显著降低，但由于产卵时间而降低。由于鸡群年龄，受精孵化率也显著降低，但产卵时间没有显著影响。由于鸡群年龄，早期和晚期死胚增加，但产卵时间没有显著影响。结论是，尽管由于产卵时间的不同，蛋重和贮存期间的蛋重损失存在显著差异，但产卵时间对受精率或受精孵化率没有影响。
