To investigate the effect of vitamin E addition on the discoloration and decrease of heme pigments in pork by NaCl, vitamin E was added at the level of 0.02% to salted (2% NaCl) ground loin meat (24hr postmortem), and then stored aerobically at 2-3°C for 1 week. Vitamin E addition was found to inhibit the decrease of heme pigments by NaCl. When NaNO₂ (50ppm) was added into the meat and stored for 1 week under anaerobic conditions (vacuum-packed), the color forming ratio was higher and residual nitrite was lower in vitamine E-added sample than those of the control. With sodium ascorbate in the cured meat, the color formation increased with addition of vitamin E. In the case of salted ground pork stored at 2-3°C for 2 weeks under aerobic and anaerobic conditions, lipid oxidation was inhibited by vitamin E during aerobical storage, though meat redness increased somewhat. Under anaerobic conditions, the redness was higher and its decrease during storage tended to be controlled with vitamin E addition. No decrease in heme pigments by NaCl was observed at anaerobical storage, and the lipid oxidation was restrained by the addition of vitamin E.

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Authors have studied the effect of variation of environmental temperature, especially of high temperature, on the growth of piglets. This study was conducted to clarify the effect of fixed high environmental temperature on the growth of piglets. Three experimental groups were established for the different temperature: fixed at 21°C, 27°C, and 33°C. Present experiment was repeated twice for the parturition of brood saw. Six female piglets of crossbred Y (middle york)×W (large white) and 17 male Y strain piglets were used in this study. They were distributed to each group as a same mean value of body weight. This experiment was finished at the time when one of the piglets used grew up to 25kg. Feed and water were given ad libitum over the period of growth test. Means of daily gain, daily feed intake, feed conversion and body temperature were determined and the data expect body temperature were corrected by the statistically treatment. Daily gain of the 33°C group was significantly lower than those of the other two groups (21°C and 27°C). Daily feed intake of the 33°C group was significantly lower than that of the 21°C group but that of 27°C group showed no significant difference for the other two groups. As the results, high environment temperature condition did not affect to the body temperature, but it affected to the body weight gain and feed intake. Especially the 33°C condition affected to the feed conversion apparently. It seemed that the high environmental temperature condition affect to the energy metabolism of piglets, therefore the further examination of this point is required in future work.

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Fifty three pregnant sows between 23 and 95 days of gestation were slaughtered to study the growth of fetuses and conceptus, and morphological changes in the genital organs of pregnant sows. With advanced gestation, the weight of fetus increased exponentially, while the length increased linearly. Following regression equations were obtained;
Y=e^-38.497·X^{(16.291-1.404·logX)} (R²=0.997) for the weight,
Y=0.3057X-6.2899 (R²=0.964) for the length,
where X is the day of gestation.
The number of the fetuses per litter ranged from 6 to 18. But litter size was not significantly correlated with the weight or length of fetuses. The weight of uterine horn, placenta, amnion liquid, uterine cervix, vagina and vaginal vestibule increased in proportion to advance of gestation. In these organs, the weight of uterine horn also correlated with the number of fetuses positively. An overall fetal survival rate, calculated by the total number of fetuses/that of corpora lutea, was 71.7%.

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