Measures of the ovaries and uterus during development of gilts selected for differences in uterine capacity.
Measures of the ovaries and uterus during development of gilts selected for differences in uterine capacity.
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DOI：
10.2527/jas.2013-7205
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发表时间：
2014-06
影响因子：
3.3
通讯作者：
C. Lents;R. Cushman;B. Freking
中科院分区：
文献类型：
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作者：
C. Lents;R. Cushman;B. Freking
子宫容量（UC）的直接选择增加了生猪出生的数量。需要一种间接估计后备母猪发育中UC的方法，以将该性状纳入商业选择策略。我们检验了UC选择改变青春期前后备母猪生殖道表型特征的假设，这些变化可以使用经直肠超声（TRU）在活体动物中估计。在130、150或170日龄时提交来自选择用于UC的品系和随机选择的对照（CO）品系的后备母猪进行TRU，并在24小时后收获（n = 10头后备母猪/品系/年龄）。在TRU测量子宫角直径（每只动物2 - 4次测量）。在收获时，测量卵巢（高度、宽度、长度、重量和>1 mm的可见卵泡的数量）和子宫角（重量、长度、直径和子宫内膜直径）。各性状均不存在品系×年龄互作。卵巢各性状随年龄增长而增加（P < 0.03）。子宫角的重量和长度在130日龄和150日龄时无显著差异，但在170日龄时显著增加（P < 0.01）。子宫角直径在170日龄较130或150日龄有增大趋势（P = 0.06），但年龄对子宫内膜直径无影响（P = 0.38）。卵巢重量和宽度增加（P < 0.01），卵巢长度和高度有增加的趋势（P = 0.07），但可见卵泡的数量没有差异。UC后备母猪的子宫角重量增加（P < 0.02），其倾向于（P = 0.09）长于CO后备母猪。UC母猪子宫角和子宫内膜的直径大于CO母猪（P < 0.01）。子宫角直径与TRU测量不受年龄或行，并没有高度相关的任何测量的性状。选择UC增加导致卵巢和子宫角较大，但TRU对估计研究年龄后备母猪的这些性状没有帮助。
Direct selection for uterine capacity (UC) increased the number of live pigs born. A method to indirectly estimate UC in developing gilts is needed for this trait to be incorporated into commercial selection strategies. We tested the hypothesis that selection for UC alters phenotypic characteristics of the reproductive tract of prepubertal gilts and that these changes could be estimated in live animals using transrectal ultrasound (TRU). Gilts from lines selected for UC and a randomly selected control (CO) line were submitted for TRU at 130, 150, or 170 d of age and harvested 24 h later (n = 10 gilts/line per age). Diameter of the uterine horn was measured (2 to 4 measurements per animal) at TRU. At harvest, measurements of the ovary (height, width, length, weight, and number of visible follicles >1 mm) and uterine horn (weight, length, diameter, and endometrial diameter) were taken. There was no line × age interaction for any of the traits. All ovarian traits increased (P < 0.03) with age. Weight and length of the uterine horn was not different at 130 or 150 d but were increased (P < 0.01) at 170 d of age. Diameter of the uterine horn tended (P = 0.06) to be increased at 170 d compared with 130 or 150 d, but age did not affect (P = 0.38) endometrial diameter. Ovarian weight and width were increased (P < 0.01) and ovarian length and height tended (P = 0.07) to be greater for UC than CO gilts, but the number of visible follicles did not differ. The UC gilts had increased (P < 0.02) weight of uterine horns, which tended (P = 0.09) to be longer than in the CO gilts. Diameter of the uterine horn and the endometrium were greater (P < 0.01) for UC gilts than for CO gilts. Uterine horn diameter measured with TRU was not affected by age or line and was not highly correlated with any of the measured traits. Selection for increased UC results in larger ovaries and uterine horns, but TRU was not useful for estimating these traits in gilts of the age studied.