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Antisera were raised against highly purified preparations of porcine luteinizing hormone (pLH) and follicle-stimulating hormone (pFSH). Highly specific and sensitive radioimmunoassay systems were developed.

The antisera to LH and FSH were used at working dilutions of 1: 500 000 and 1: 200 000 respectively and the sensitivities of the assays were 0·1 ng LH/ml serum (3 x 10^–12 mol/l) and 0·5 ng FSH/ml serum (1·5 x 10^–11 mol/l). The LH and FSH preparations used as standards were 1·2 and 81 times as potent as NIH-LH-S15 and NIH-FSH-P1 respectively. Both assays were validated and adapted for the measurement of the gonadotrophin content of porcine serum.

The concentrations of LH and FSH in blood were measured simultaneously in prepubertal sows throughout a 24 h period, in adult sows during the oestrous cycle and in both prepubertal and adult animals after treatment with LH releasing hormone.

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