A total of 429 Large White boars were slaughtered at 90kg live weight to study the relationship of the size of male genital organ to body size, meat performance and heredity. The means were 195.3g for testis weight, 9.9cm for long diameter of testis, 6.4cm for short diameter of testis, 39.2g for epididymis weight, 132.6g for vesicula seminalis weight, 4.9g for prostate weight, 48.2g for glandulae bulbourethrales weight and 40.6cm for length of penis. The weight of these organs varied widely in individuals. Weight and long diameter of the left testis were greater than the right (P<0.01). These genital characteristics were positively correlated except for short diameter of testis and length of penis. They were negatively correlated with the average daily gain and were positively correlated with the chest girth. Estimated heritabilities for these eight characteristics from full-sib analysis were 0.46, 0.67, 0.48, 0.50, 0.40, 0.52, 0.71 and 0.45, respectively. Apart from above animals, 23 boars which showed monorchism condition had larger testes than normal boars (P<0.01), suggesting compensatory growth of testes.

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A total of 315 Large White gilts were slaughtered at 90kg live weight to study the relationship of the size of female genital organ to body size, meat performance and heredity. The average total weight of the organs was 197.5g. The average length and weight were 7.6cm and 41.1g for vaginal vestibule, 6.0cm and 22.8g for vagina, 12.2cm and 45.8g for uterine cervix, 45.2cm and 30.9g for uterine horn (mean of the Left and Right sides), 17.7cm and 2.21g for oviduct (mean of L and R). The average weight of ovaries was 2.77g (mean of L and R) and the average area of external genitalia was 9.8cm². These characteristics had large variations in individuals, especially in the weights. The left organs were significantly greater than the right ones in the length of oviduct (P<0.01), the weight of oviduct (P<0.05) and the weight of ovary (P<0.01). The pigs which had large body hight, large external genitalia and small daily gain had larger genital organs. Heritability estimates were 0.716 for the whole weight of the organs, 0.563 for the area of external genitalia, 0.269 (length) and 0.692 (weight) for vaginal vestibule, 0.350 (length) and 0.829 (weight) for vagina, 0.402 (length) and 0.632 (weight) for uterine cervix, 0.665 (length) and 0.596 (weight) for uterine horn, 0.493 (length) and 0.492 (weight) for oviduct and 0.323 for the weight of ovary by full-sib analysis.

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Porcine exudative epidermitis (PEE) is a skin disease caused by Staphylococcus hyicus subsp. hyicus that shows high drug resistance. This infection has induced highly economical losses in swine production.
Reports concerning the therapy of the PEE by Enrofloxacin (ERFX) were very rare. Therefore, we performed the clinical study of the PEE with ERFX, in which 86 piglets were intra-muscularly injected ERFX of 5mg/kg daily. The results showed that the clinical and dermal symptoms were dramatically improved in all groups. This indicated that ERFX is a useful therapeutics for the treatment of PEE.

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Recent reports on artificial insemination by use of the frozen boar semen have shown that fertilization rate is lower than that of the liquid semen. The study reported here was conducted to gain the fertilization rate at the early embryonic stage. Twenty five multiparous sows (LW) and 2 gilts were inseminated with the semen of one boar (Duroc), slaughtered in several days following the insemination, and then the ova were collected. The average fertilization rate of 17 sows the ove of which collected was 53.3% and the average number of fertilized ova concluded from number of corpora lutea was 11.3. Fifteen out of 17 sows stated above were nultiparae inseminated with liquid semen in the past and the mean litter size was 12.3 at that time. Also the average number of the ova fertilized using liquid semen at the present study was 16.2. These results suggested that the lower fertilization rate in sows inseninated with frozen semen was due to the use of frozon semen. But the mechanism was not clear.

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