[Changes in the dry matter and various minerals in the sow endometrium during the sexual cycle].

Analyses were performed in 16 praepubertal and 85 sexually mature gilts of the Bohemian Large White breed. The content of dry matter in the endometrium of praepubertal gilts was 15.511%, on an average, and in sexually mature sows 11.968%, on an average, in the follicular phase, and 14.326% in the luteal phase. The differences are statistically highly significant (P less than 0.01). Considerable differences (mostly highly significant) were found also in the contents of calcium, phosphorus, magnesium, sodium, potassium, and chlorine in the dry matter of endometrium in praepubertal and sexually mature sows; however, these differences were less frequently dependent on individual stages of the sexual cycle. The highest content of calcium (1.112 mg g(-1)), phosphorus (8.357 mg g(-1)), and magnesium (0.720 mg g(-1)) in dry matter was found in gilts in the oestral phase, and the lowest in late or early metestrus (Ca = 0.625 mg g(-1), P = 0.6369 mg g(-1), Mg = 0.498 mg g(-1). Sodium showed the highest values in proestrus (23.359 mg g(-1)), and potassium in oestrus (13.012 mg g(-1)); their lowest values were recorded in late metestrus (Na = = 17.742 mg g(-1)) and in proestrus (K = 10.141 mg g(-1)). The content of these elements in endometrium dry matter was also much lower in praepubertal gilts than in sexually mature sows (with the exception of phosphorus); the difference was always highly significant.