INFLUENCE OF INITIAL LENGTH OF UTERUS PER EMBRYO AND GESTATION STAGE ON PRENATAL SURVIVAL, DEVELOPMENT, AND SEX-RATIO IN THE PIG
INFLUENCE OF INITIAL LENGTH OF UTERUS PER EMBRYO AND GESTATION STAGE ON PRENATAL SURVIVAL, DEVELOPMENT, AND SEX-RATIO IN THE PIG
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DOI：
10.2527/1993.7171895x
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发表时间：
1993-07-01
影响因子：
3.3
通讯作者：
DZIUK, PJ
中科院分区：
文献类型：
--
作者：
CHEN, ZY;DZIUK, PJ
每个胚胎的子宫长度和妊娠阶段对产前存活、发育和性别比的影响是通过系统地将每个潜在胚胎的初始子宫长度限制在 5、10、15、20、25、30、35、40、45 或 > 50 厘米，并在胚胎第 17、23、29、35 或 41 天检查生殖道来确定的。妊娠。第 3 天时，子宫角的平均长度为 169 +/- 35 厘米，范围为 80 至 255 厘米。黄体 (CL) 的平均总数为 12.4 +/- 2.34。排卵率往往与子宫角的长度相关（r = .38；P > .1）。产前生存率与初始分配的子宫空间（5 至 25 cm/CL）高度相关（r = .95；P < .05）。当空间 > 25 cm/CL 时，产前存活率不受空间影响 (r = .53；P < .1)。在所有组中，无论可用空间如何，在第 17 天之前都发生了一些产前损失。在 < 25 cm/CL 的切片中，在第 29 至 35 天之间发生了第二次损失。在第 35 天之前，限制对胎儿长度或体重没有显着影响，但在第 35 天之后，来自 > 25 cm/CL 切片的胎儿比来自空间较小切片的胎儿更长和更重 (P < .05)。更大的子宫空间被更大的胎儿占据（P < .05）。在拥挤和宽敞的部分，男性胎儿比女性胎儿占据更多的子宫空间（P < .05）。在第 41 天指定空间 < 25 cm/CL 的拥挤部分中，雄性比雌性轻（雄性 10.17 g，雌性 11.56 g）。在分配空间 > 25 cm/CL 的切片中，雄性比雌性重（雄性 12.91 g，雌性 12.05 g）（P < .05）。妊娠早期胚胎的性别是通过使用 Y 染色体 DNA 片段的探针来确定的。当胚胎初始子宫长度限制在<10cm时，42%为男性（P>.1），当胚胎限制在大于或等于15cm时，男女性别比为49:51。
The effects of uterine length per embryo and stage of gestation on prenatal survival, development, and sex ratio were determined by systematically restricting embryos to 5, 10, 15, 20, 25, 30, 35, 40, 45, or > 50 cm of initial uterine length per potential embryo and examining the reproductive tracts at d 17, 23, 29, 35, or 41 of gestation. At d 3 the mean length of a uterine horn was 169 +/- 35 cm, with a range of 80 to 255 cm. The mean total number of corpora lutea (CL) was 12.4 +/- 2.34. Ovulation rate tended to be correlated with the length of uterine horns (r = .38; P > .1). Prenatal survival was highly correlated with initial assigned uterine space from 5 to 25 cm/CL (r = .95; P < .05). Prenatal survival was not affected by space (r = .53; P < .1) when space was > 25 cm/CL. In all groups, regardless of space available, some prenatal loss occurred before d 17. In sections with < 25 cm/CL, a second loss took place between d 29 and 35. Before d 35, there was no significant effect of restriction on either fetal length or weight, but after d 35, fetuses from sections with > 25 cm/CL were longer and heavier than those from sections with less space (P < .05). Greater uterine space was occupied by larger fetuses (P < .05). Male fetuses occupied more uterine space than female fetuses did in both crowded and roomy sections (P < .05). In crowded sections with assigned space < 25 cm/CL at d 41, males were lighter than females (male 10.17 g, female 11.56 g). In sections with assigned space > 25 cm/CL, males were heavier than females (male 12.91 g, female 12.05 g) (P < .05). Sex of embryos at very early stages of gestation was determined by using a probe of a DNA segment of the Y-chromosome. When embryos were restricted to < 10 cm initial uterine length, 42% were male (P > .1), and when embryos were restricted to greater-than-or-equal-to 15 cm, sex ratio of male:female was 49:51.