A Berkshire sow and a wild boar (Sus scrofa leucomystax) were crossed to produce 18 hybrid offsprings. They grew up to different weights of 50kg, 70kg and 90kg of 6 animals each, which were slaughtered at each of these three different weights. Experiments were conducted to determine traits of carcass and changes in properties during growth of the hybrid animals. The results were as described below.
1) As to proportions of dressing percentage and anterior, central and posterior sections, the proportions of dressing percentage and central part became significantly larger, whereas those of anterior and posterior parts became smaller as their body weights gained in growth. As for the structural proportions of bone, fet and muscles in the posterior part, the proportion of fat significantly increased, whereas the proportions of muscles and bone became significantly smaller as the body weights gained.
2) The thickness of the back fat and that of loin eye area were significantly larger as body weights gained.
3) As to general components of muscles and tissues, the moisture content became significantly smaller, whereas the content of crude protein significantly larger as the body weights gained. There was no appreciable difference in the content of crude fat.
4) The brightness and hue of color of the meat of longissimus dorsi significantly decreased, whereas reddish color shade and chroma of the meat there increased as body weights gained. There was no appreciable difference in the yellowish coloration of the meat.
5) No remarkable changes were noted in the properties of adipose tissues with the gain of body weights. The iodine value in the outer back fat was the highest followed by those of the inner back fat and the kidney leaf fat, whereas the melting points of them were in the tendency of the reverse order.
6) As to the comoposition of fatty acids in the muscle tissues, the concentration of stearic acid in them significantly decreased as body weights gained. The levels of palmitic acid and the total saturated fatty acids in the longissimus dorsi were found significantly higher than those of the biceps femoris and semimembranosus, whereas a reverse tendency was found out in them in terms of the concentrations of linoleic acid and total unsaturated fatty acids. With respect to the composition of fatty acids in the adipose tissues, the concentrations of stearic acid and total saturated fatty acids increased and that of linoleic acid decreased as body weights gained. The levels of stearic acid total saturated fatty acids were the highest in kidney leaf fat, followed by those of the inner back fat and the outer back fat in this decreasing order, whereas those of linoleic acid were in the reverse tendency.
From the above-mentioned results, it could be conceived that there was a tendency toward improvements in the volume and quality of meat in the course of growth, but it could be also conceived that there were hardly any changes in the physico-chemical properties of meat in comparison with the results of carcass dressing.

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In order to clarify the physiological traits of primary SPF piglets, a comparative study was conducted to examine their growths and blood properties with those of normal piglets given clostrum. Employed as SPF piglets were 28 piglets produced from 4 sows of LW, which were established by hysterctomy, and 20 piglets produced from 4 sows of LW, which were obtained by natural farrowing.
The mean body weights at birth were invariably 1.3kg in both the SPF piglets and the normally obtained piglets. The mean body weights at age of 4 weeks were 7.5kg in the naturally farrowed piglets and 4.5kg in the primary SPF piglets. The age to reach a body weight of 30kg was 65 days and 73 days in the naturally farrowed piglets and primary SPF piglets, respectively. The mean daily weight gain thereafter up until 90kg of body weight was 711g and 788g, respectively, while the feed conversion efficiency was 3.29 and 2.83, respectively. In all of these aspects, the primary SPF piglets showed more favorable results. On the other hand, RBC and hematocrit value, among other traits of blood, of the primary SPF piglets were higher than those of the spontaneously farrowed piglets us until the age of 2 months. The WBC at one week of age was 9990/mm³ in the naturally farrowed piglets and 6640/mm³ in the primary SPF piglets, while those at 2 months were 18, 000/mm³ and 7, 500/mm³, respectively. The total protein in serum and albumin content in serum of primary SPF piglets at age of one week were approximately 1/2 of those of the spontaneously farrowed piglets, but both groups showed almost equal results in both aspects at age of 2 months.
γ-Globulin was hardly detected in the primary SPF piglets at age of 4 weeks, and was 6.1% at age of 3 months, which was about half of that of the spontaneously farrowed piglets of 12.7%.

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A comparative examination was conducted in the present study on various constituents and properties of blood collected from living bodies and that collected by bleeding discharge after slaughter in terms of Ht, Hb, RBC, Fe, Ca, Mg, IP, ALP, GOT, GPT, LDH, Glu, T-Chol, Tri-G, P-lip, TP, A/G, γ-glob and BUN.
There was no significant difference between them in terms of Ht, Hb, RBC, Fe, Ca, Mg, IP, ALP, GOT, GPT, T-Chol, Tri-G, P-lip, TP, A/G γ-glob and BUN, whereas statistically significant differences were seen between them in terms of WBC. LDH and Glu.

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