A comparative study was conducted between porcine sera and plasma on biochemical constituents in terms of their concentrations and the tendency of hemolysis and the following results were obtained.
In the comprative check of severity of hemolysis of sera and plasma by absorptimetry (Jpn. J. Swine Sci.; 25, 1988), the (-), (±), (+) and (++) cases amounted to 53.3%, 33.3%, 6.7% and 6.7%, respectively, of serum samples, while those of plasma samples amounted to 46.4%, 16.7%, 20.0% and 16.7%, respectively.
The comparison between sera and plasma samples in terms of measurement values of biochemical constituents revealed no appreciable difference in Alb, BUN, Na, K. Cl, ALP, CPK, GPT, LDH, Glu, T-chol and Tri-G and more or less differences in TP, T-bil, Cre, Ca, GGT, and GOT.
In every item of the measurements with sera and plasma in which differences were observed, significant correlation between the results of sera and those of plasma. Furthermore, a correlation coefficient of 0.7 or more and a regression coefficient in the range of 0.7-1.2 could be found out in TP and Ca.

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A comparative experiment using 38 three-way crossbred pigs was conducted to compare the quantitative changes in the chemical composition of body and abilities to accumulate proteins and fat between both sexes of barrows and gilts during the period of their growth in terms of their body weights between 30kg and 120kg. Two or three each of barrows and gilts were slaughtered at their live weights of 30, 45, 60, 75, 90, 105 and 120kg following ad libitum feeding. Body composition were determined by removing the contents of their digestive tracts, freezing of the bodies, and grinding each of the bodies under frozen state for chemical analysis. The quantity of daily mean feed intake by each of them was expressed by semilogarithmic equations of body weight, and the result revealed that the barrows consumed more feed than gilts. The relationship between the live body weight and the chemical compositions of body excluding the contents of digestive tracts was analyzed with linear logarithmic regression to determine which equation could best represent the data. Allometry equation (Y=aX^b) was found to fit best for expressing the relationship, i. e. between the water, fat and proteins in the body during the growth and the body weight which was used as the variable. The relative growth coefficient for water was 0.803 for barrows and 0.903 for gilts, showing inferior growth (0<b<1), while that for fat was 1.624 in barrows and 1.383 in gilts, showing superior growth (b>1). The one for proteins was 0.919 for barrows, which was inferior growth and 1.041 for gilts, which was superior growth. In barrows, less water and proteins were noted, while more fat was found out, when compared with gilts. These differences between barrows and gilts became appreciable after reaching a body weight of approx. 65kg. The allometry equation became applicable for fat in both sexes, and the gain in the amount of fat of barrows became larger than that of gilts since around the age of 110 days, whereas water and proteins did not show any appreciable difference between the two sexes in terms of semilogarithmic function. Predicted values for protein accumulation per day for barrows and gilts were the highest during the period of body weight of 30kg up to 45kg, amounting to 157.8g and 133.3g, respectively.

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Thirty eight line-crossbred pigs (19 castrated male and 19 female pigs) were used to clarify the sex difference in fat accumulation with growth and to investigate the method for estimating total carcass fat percentage from carcass cross-section fat area percentages. The carcass cross-section fat area percentage was used to estimate the differences in fat accumulation. Two or three each of castrated male and female pigs were killed at live weights of 30, 45, 60, 75, 90, 105 and 120kg. The cross sections at each dorsal and lumbar vertebrae were obtained by sawing cross-sections through the frozen right half carcass. The fat area of each cross section was then measured with a Digitizer.
When the pigs had grown to 60kg of live body weight, the castrated male pigs, were found to have accumulated more fat than females at the first stage of growth (45kg of body weight) in the back of dorsal vertebra and the front of the lumbar vertebra (12th dorsal vertebra-3rd lumbar vertebra). At the middle stage of growth (60-75kg), the castrated male pigs accumulated more fat at all sites of the dorsal and lumber vertebrae than the female pigs. As the pigs gained weigits, fat accumulated first as subcutaneous fat, than as intermuscular fat and finally as ventral fat at any stage of growth.
Castrated male pigs accumulated more fat than females in the intermuscular fat of the shoulder and middle trunk and in the subcutaneous fat and also in the intermuscular fat of the loin.
Carcass fat percentage was estimated using 6 variables of the 1st, 7th, 9th, 12th and 13th dorsal vertebrae and carcass weight, with 99.25% contribution ratio in castrated males and using 4 variables of carcass weight and the 8th, 15th, and 16th dorsal vertebrae with 93.19% contribution ratio in female pigs.

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