Wettemann R P, Johnson R K, Omtvedt I T
J Anim Sci. 1980 Dec;51(6):1352-7. doi: 10.2527/jas1981.5161352x.
Relationships between plasma progesterone and luteinizing hormone (LH) and the numbers of corpora lutea and embryos were determined in 133 8-month-old purebred Duroc, Hampshire and Yorkshire gilts and two-breed crosses among the three breeds. The numbers of corpora lutea and normal embryos were determined at slaughter on day 30.8 +/- .2 of pregnancy, and progesterone and LH were quantified in plasma obtained the previous day. Progesterone concentrations in plasma were influenced by sire (P less than .10), breed of dam (P less than .05) and breed of sire x breed of dam (P less than .05). Hampshire gilts had higher concentrations of progesterone in plasma than did Durocs (P less than .05) and Yorkshires (P less than .01). None of the effects in the model was significant for LH. Plasma progesterone and LH had heritability estimates of .48 +/- .41 and .29 +/- .40, respectively. Most genetic and phenotypic correlations of plasma progesterone and LH correlations of plasma progesterone an LH with other traits were small. These data indicate that progesterone concentrations in plasma at 30 days of pregnancy are not a satisfactory predictor of the numbers of corpora lutea and embryos. The differences in plasma progesterone between breeds illustrate the need to consider the breed of gilts when selecting animals for the study of luteal function or physiological factors that may influence progesterone concentrations in plasma.
在133头8月龄的纯种杜洛克、汉普夏和约克夏后备母猪以及这三个品种间的二元杂交母猪中，测定了血浆孕酮与促黄体生成素（LH）之间的关系，以及黄体数和胚胎数。在妊娠第30.8±0.2天屠宰时确定黄体数和正常胚胎数，并对前一天采集的血浆中的孕酮和LH进行定量。血浆孕酮浓度受父本（P<0.10）、母本品种（P<0.05）以及父本品种×母本品种（P<0.05）的影响。汉普夏后备母猪血浆中的孕酮浓度高于杜洛克母猪（P<0.05）和约克夏母猪（P<0.01）。模型中的所有效应对于LH均不显著。血浆孕酮和LH的遗传力估计值分别为0.48±0.41和0.29±0.40。血浆孕酮和LH与其他性状的大多数遗传和表型相关性较小。这些数据表明，妊娠30天时血浆中的孕酮浓度并非黄体数和胚胎数的理想预测指标。品种间血浆孕酮的差异表明，在选择用于黄体功能或可能影响血浆孕酮浓度的生理因素研究的动物时，需要考虑后备母猪的品种。
