Abstract
Simple SummaryIn cattle there are physiologically two morphological forms of the corpus luteum: compact and with cavity. During ultrasound examination a fluid filled cavity is clearly visible. Routine ultrasound examination is performed—as a part of preselection—in embryo-recipient heifers/cows. Some vets eliminate recipients with cavitary corpus luteum from embryo transfer, considering them to be less suitable for an embryo to develop. In our research, we showed that the level of progesterone in the blood of recipients on Embryo Transfer day was higher in the case of cavitary corpus luteum than in the case of compact ones. Similarly, the pregnancy rate of recipients with a cavitary corpus luteum was higher. The presence of cavity inside the corpus luteum should not be a reason for the elimination of recipients from embryo transfer. Moreover, cavitary corpus luteum may be a valuable indicator of the recipient’s reproductive potential.The aim of the study was to conduct an ultrasound analysis of quantitative parameters of the corpus luteum (CL) in recipient heifers on days 6–8 after oestrus, and to compare reproduction potential of both types of CL in those females. Analyses were performed on 300 heifers, synchronized with two injections of cloprostenol. Clinical and ultrasound examinations of ovaries were performed and measurements of the CL were recorded. The blood samples were taken to determine progesterone level. Pregnancy examination was conducted after 6–8 weeks from the ET. Cavitary CL was found in 32.7% heifers In 48.0% of the cavitary CL, its luteal tissue area was reduced by 14.3% compared to the compact CL, while 16.3% of the CL had luteal tissue reduced by more than 33.8%. Progesterone level in blood serum was higher in heifers with the cavitary CL (p < 0.001). Pregnancy rate was higher for females with a cavitary CL (52%) than those with compact ones (33%, p < 0.05). The ultrasound assessment of luteal tissue should be included in the evaluation of the functional status of the CL in ET-recipient heifers. The cavitary CL presence may indicate a higher potential of the recipient in maintaining the pregnancy.
Highlights
The clinical examination of ovaries to confirm the presence of the corpus luteum (CL)is one of the component procedures in the selection of recipients on the day of embryo transfer (ET)
More significant dimensions of cavitary CLs were confirmed when comparing them with compact CLs both on the same and the opposite ovary (Table 3)
We showed a relatively quick increase in the cavity and clearly slower growth of luteal tissue
Summary
Is one of the component procedures in the selection of recipients on the day of embryo transfer (ET). Since the embryo is transferred into the ipsilateral horn of the uterus, several studies have shown that a CL of at least 17 mm in its diameter [1] guarantees a satisfactory conception rate and maintenance of pregnancy [1,2,3,4]. Ultrasonography is increasingly applied in veterinary gynecology [3,6,7,8,9,10] It provides an accurate description of ovarian structures, including the objective determination of the position, number, dimensions, and structure of the CL [6]. The ultrasound characteristics of the CL detected on days 6–8 after oestrus may be of significant importance for the selection of recipients for ET
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