Robinson F E, Hardin R T, Robinson N A, Williams B J
Department of Animal Science, University of Alberta, Edmonton, Canada.
Poult Sci. 1991 Apr;70(4):760-5. doi: 10.3382/ps.0700760.
A study was undertaken to determine whether fertility, early embryo viability, and the weight of the egg, shell, and embryo are influenced by the position of an egg in a laying sequence. One hundred and three Indian River broiler breeder hens were housed individually in cages at 21 wk of age. Beginning at 43 wk of age, each hen was inseminated once per week, with 50 microL of fresh undiluted pooled semen from Indian River broiler breeder males. Beginning at 45 wk of age, and for the following 45 days, all eggs laid were collected. Eggs were collected hourly for 8 h after "lights on" and a final daily collection was made 14 h after lights on. Each egg was classified as "first-of-sequence" or "subsequent". Eggs were weighed and placed in a forced-air incubator twice per week. After 168 h of incubation, the eggs were removed from the incubator, weighed and assessed for fertility and embryo viability status. The embryo was also weighed. Shell weight was recorded after 3 to 4 days of air drying. Egg weight was significantly greater in first-of-sequence compared with subsequent eggs. First-of-sequence eggs exhibited significantly smaller Day 7 embryos (on a percentage basis), lower shell weight (on a percentage basis), and significantly less egg weight loss during the 7 day incubation period (absolute and percentage basis) than did subsequent eggs on a sequence. Least squares (LS) means for fertility did not differ significantly between first (87.02%) and subsequent (89.56%) eggs.(ABSTRACT TRUNCATED AT 250 WORDS)
开展了一项研究，以确定产蛋顺序中鸡蛋的位置是否会影响受精率、早期胚胎活力以及蛋、蛋壳和胚胎的重量。103只印第安河肉种鸡母鸡在21周龄时单独饲养在笼中。从43周龄开始，每只母鸡每周人工授精一次，使用50微升来自印第安河肉种鸡公鸡的新鲜未稀释混合精液。从45周龄开始，并在接下来的45天里，收集所有产下的鸡蛋。在“开灯”后每小时收集一次鸡蛋，共收集8小时，并在开灯后14小时进行最后一次每日收集。每个鸡蛋被分类为“序列中的第一个”或“后续的”。鸡蛋称重后每周放入强制通风孵化器两次。孵化168小时后，将鸡蛋从孵化器中取出，称重并评估受精率和胚胎活力状态。胚胎也进行称重。空气干燥3至4天后记录蛋壳重量。与后续鸡蛋相比，序列中的第一个鸡蛋重量显著更大。序列中的第一个鸡蛋在第7天的胚胎（以百分比计）显著更小，蛋壳重量（以百分比计）更低，并且在7天的孵化期内鸡蛋重量损失（绝对和百分比）比序列中的后续鸡蛋显著更少。第一个（87.02%）和后续（89.56%）鸡蛋的最小二乘（LS）平均受精率没有显著差异。（摘要截断于250字）
