A whole system for the automatic removal of waste and treated effluent and installment to flush out the waste from a 500-pig unit was constructed in YORII, and was started operating on June 3, 1970. The installment for conventional activated sludge was erected by the financial aid of Ministry of Agriculture and Forestry and Saitama Prefecture. National Institute of Animal Industry sponsored it as a demonstration project. Figure 1 is a flow chart of the total plant. During the 2 years of operation for the study of BOD, SS, T-N the main emphasis was on assessing and demonstrating the technical and ecological feasibility of the holding of waste and treated effluent without creating gross water pollution nor odor nuisance.
The results were as follows:
1) The flushing water carries the dung from the animal barns deferated on the gutter to a sump, from where the waste water is pumped onto a stainless steel screen. Through the screen, the solids are separated from the liquids. Clean water is added to the liquids and mixed, diluted, and discharged into the conventinal activated sludge, and clarified. Meanwhile, the solids separated by the screen, are transported by the dump car onto the mulberry field. In the aeration tank activated sludge, return sludge diluted liquids were mixed. After 12 hours treatment, the supernatant from the settling tanks is overflown into the sludge concentrating tanks, and the final supernatant is filtered through the chlorine disinfection equipment and overflown into the river.
2) During the 2 years of operation, average influent BOD onto the screen was 3, 530±1, 400ppm. At the screen, the BOD was separated from liquids. Liquid BCD was 2, 750±1, 048ppm. Average Suspended Solids (SS) in the screen was 5, 160±2, 475ppm. At the screen, the SS was separated from liquids. Average SS was 3, 850±1, 680ppm.
3) During optimum operation of the plant (BOD load 0.50kg/M/day), the pH of the mixed liquor remained in a favorable range between 6.5 to 7.0. Mixed Liquor Suspended Solids (MLSS) remained at an optimum level of around 7, 800ppm and ranged from 5, 000 to 12, 900ppm during the first one year. Average influent SS in aeration tank during the first one year of operation was 1, 580ppm, and ranged from 430 to 2, 800ppm. But the effluent water SS remained in the range of 14 to 151ppm and average 70ppm. Average influent BOD in aeration tank was 1, 100ppm and ranged from 450 to 130ppm and average 70ppm.
4) We felt that we needed to devise a very simple test which could be run the farm to monitor the efficiency of the plant. Sludge Volume (SV) was such a test. SV is an excellent index of the level of effiency of the plant. During the first one year of operation, the SV of the mixed liquor averaged 30%.
5) Temperature of the mixed liquor was in the range of 7°C to 23.1°C during the period of operation, but decresed to 7°C-11°C after the winter operation.

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The anthelmintic effects of parbendazole were investigated with 71 hogs singly or doubly infected by roundworms and/or whipworms. The animals were divided into groups of the oral administration with a dumpling containing 30mg/kg bd. wt. of parbendazole, the oral administration with a feed containing 0.05% parbendazole over 3 successive days, the single oral administration with a feed containing 0.1% parbendazole, and the oral administration with a feed containing 0.33% parbendazole preparation in lactose.
1) Swine in the groups of 3-day feeding of 0.05% parbeendazole and of single feeding of 0.1% parbendazole gave 95-100% negative count of eggs of nematodse at both 7 and 21 days after its administration.
2) Eggs of nematodes were noted in the feces of swine in all the groups treated with parbendazole. It took 6 days on the average for the worms to be expelled.
3) No residual worm bodies were detected in the intestines of swine upon autopsy.
4) No side effect was noted following administration of parbendazole in the clinical general findings.

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In an attempt to establish a method for estimating of lean meat amounts in pork carcass by using various mesurements which is externally measurable on carcass, namely morphogical criteria, studies were carried out on the correlation between the morphological criteria and the amounts of lean meat, and additionally the effectiveness of various measuremeuts on the surface of the section of longismus thoracis was studied at the view point of a factor for carcass evaluation.
It was clarified as a result that grades of pork carcass indicated corresponding differences between each other in terms of diameter, circumference and sectional area of the section of longismus thoracis, warranting that this factor can be used as a criterion. Of these, the sectional area showed the closest relationship with the carcass gredes and was therefore, deemed to be the most suitable factor for carcass evaluation. The section at the No. 5 and No. 6 vertebrae thoracicae was found to de of a shape of a nearly regular ellipse, and this finding suggested that assessment of the sectional area of longismus thoracis from only one diameter of its section would have higher deviations from the real values.
The lean meat amounts in the carcass is correlated relatively significantly with the carcass length and the sectional area of longismus thoracis both being regarded as independent of each other among other morphological factors of various types. It was found out that better results could be attained for assessment of lean meat amounts by using the multiple regression formula composed of the width of carcass and the multiplied product of the carcass length by the sectional area of longismus thoracis. However, it is recommendable to use multiple regression coefficients varying with the uniformity of carcass to be used for comparison.
With the multiple regression formula thus proposed, it was realized that the results of the grading test at the fourth All-Japan pig show had the swine with greater production of lean meat rated at higher renks.

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A new method using body length and chest depth which are currently employed in general for swine body measurements has been investigated in assessing the lean meat amounts to be produced from a hog on the basis of various body measurements, so that the method can be used for evaluating the results reported in the past.
It was found out from the evaluation with groups of swine with varying growth rates that the chest depth had relatively close correlation with the lean meat, and body length, rear width, and growth rates in the decreasing order. Regression formula was designed for evaluation of lean meat amounts on the basis of the individual determination values or the combinations of two or more of these values. As a result, it was realized tohat the multiple regression formula based on the combination of chest depth and body length can be adapted for the evaluation of lean meat with relatively high probabilities.
It was also clarified that the rear width and growth rate do not contribute at all to higher accuracy of assessment of lean meat amounts.

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