Guilbault L A, Grasso F, Lussier J G, Rouillier P, Matton P
Agriculture Canada Research Station, Lennoxville, Quebec, Canada.
J Reprod Fertil. 1991 Jan;91(1):81-9. doi: 10.1530/jrf.0.0910081.
Dairy heifers were superovulated in the presence (dominant group, N = 8) or absence (non-dominant group, N = 6) of a dominant follicle at the start of a a superovulatory treatment on Days 7-12 of the oestrous cycle (Day 0 = oestrus). Daily ultrasonographic observations of ovaries (recorded on videotape) starting on Day 3 were used to assess the presence or absence of a dominant follicle (diameter greater than 9 mm, in a growing phase or at a stable diameter for less than 4 days) and to monitor follicular development before and during treatment. The number of CL estimated by ultrasonography (7.1 +/- 1.8 vs 13.5 +/- 1.4) or by rectal palpation (6.9 +/- 2.0 vs 16.3 +/- 1.6) and mean progesterone concentrations (32.5 +/- 19 vs 80.7 +/- 16 ng/ml) after treatment were lower (P less than 0.01) in the dominant than in the non-dominant group. Based on number of CL, two populations of heifers were identified in the dominant group, i.e. those that had a high (dominant-high, N = 4; greater than 7 CL) or a low (dominant-low, N = 4; less than 7 CL) response to treatment. During treatment, the increases in number of follicles 7-10 mm and greater than 10 mm in diameter occurred sooner and were of higher magnitude in the non-dominant than in the dominant-high or dominant-low groups (P less than 0.01).(ABSTRACT TRUNCATED AT 250 WORDS)
在发情周期第7 - 12天（第0天 = 发情期）开始进行超排处理时，对处于有优势卵泡（优势组，N = 8）或无优势卵泡（非优势组，N = 6）状态下的奶牛小母牛进行超排。从第3天开始每天对卵巢进行超声检查（记录在录像带上），以评估优势卵泡（直径大于9毫米，处于生长阶段或直径稳定小于4天）的有无，并监测处理前和处理期间的卵泡发育情况。处理后，通过超声检查（7.1 ± 1.8对13.5 ± 1.4）或直肠触诊（6.9 ± 2.0对16.3 ± 1.6）估计的黄体数量以及平均孕酮浓度（32.5 ± 19对80.7 ± 16纳克/毫升）在优势组中均低于非优势组（P < 0.01）。根据黄体数量，在优势组中确定了两个小母牛群体，即对处理反应高的（优势 - 高，N = 4；大于7个黄体）和反应低的（优势 - 低，N = 4；小于7个黄体）。在处理期间，直径7 - 10毫米和大于10毫米的卵泡数量增加在非优势组中比在优势 - 高或优势 - 低组中更早出现且幅度更大（P < 0.01）。（摘要截断于250字）
