Nihon Yoton Gakkaishi
Online ISSN : 1881-655X
Print ISSN : 0913-882X
ISSN-L : 0913-882X
Volume 24, Issue 2
Displaying 1-12 of 12 articles from this issue
  • Te Cheng CHOU
    1987 Volume 24 Issue 2 Pages 79-86
    Published: June 30, 1987
    Released on J-STAGE: June 08, 2011
    JOURNAL FREE ACCESS
    Five hundred and sixty four boars and 932 gilts of four American breeds, namely Landrace (L), Large White (W), Duroc (D) and Hampshire (H) were tested for their performance and also 169 barrows of these breeds as well as Tauyen breed were on fattening trial to evaluate the performance for market pigs. These results were as described below.
    In the four American breeds, the performance of boars surpassed that of gilts. In boars, average daily gain (ADG) and feed conversion rate (FCR) ranked in the decreasing order of D, H, W and L. The average backfat (ABF) thickness ranked in the decreasing order of H, D, W and L. In gilts, ADG ranked in the decreasing order of D, H, W and L (1976), D, W, L and H (1977), while ABF, H, W, D and L. In barrows, the fattening period of the four American breeds vs. T was 100-104 vs. 162 days, ADG 0.675-0.693 vs. 0.384kg, FCR, 3.27-3.39 vs. 4.59. showing that the results of T were inferior. ABF ranked in the decreasing order of H, D, W, L and T. The body measurements at weight of 90kg were similar among the four American breeds, but those of T were significantly smaller in terms of body length, width of fore, thoracic and rear parts, body height at withers and hip cross, fairly larger in chest depth and chest girth. In carcass, backfat thickness, loin eye area, five primal cuts both in weight and percentage ranked in the decreasing order of H, D, W and L. T was significantly smaller in these as well as carcass weight, dressing percentage, and carcass length, but T had significantly larger belly cuts.
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  • Shu FURUYA, Yuji KAJI
    1987 Volume 24 Issue 2 Pages 87-93
    Published: June 30, 1987
    Released on J-STAGE: June 08, 2011
    JOURNAL FREE ACCESS
    The influences of particle sizes of cereals and soybean meal upon the digestibility of nutrients were examined in this study by an in-vitro method using intestinal fluid of pigs and by digestion trials with growing pigs. The influences of boiling treatments of cereals upon the digestibility of nutrients were also studied with the in-vitro method.
    Corn, rice, barley, wheat and commercial flaked soybean meal were ground in a mill without a screen, while naked barley was ground with a 3mm screen into beads size and then through a 1mm sieve into fine corpuscles. By this means, particles with geometrical mean (mm) diameters of 0.95, 1.61, 1.28, 0.95, 0.84, and 1.09 were produced for bead-size samples, respectively, and those of 0.36, 0.50, 0.34, 0.30, 0.49 and 0.38 for fine particle samples, respectively. Milo was ground and sieved through a 1mm screen (fine) into a mean particle size of 0.33mm. The beads-size cereals and fine milo particles were treated with boiling each in a beaker for 10 minutes (boiled).
    The results revealed:
    1) Grinding of cereals into finer sizes and their boiling treatment evidently improved the in-vitro digestibility of dry matter and crude protein (CP). The grade of the improvement was the highest of rice, whereas that of wheat or barley was relatively small. This was deemed attributable to the fact that rice is harder and more resistive than wheat or barley, by which digestive enzymes could less easily penetrate into the grain particles in rice.
    2) Energy and CP digestibility of fine particles of rice in a digestion trial with pigs were found 5% and 10% higher than those of beads-size particles, respectively (P<0.05).
    3) When measured at the terminal ileum and over the whole digestive tracts of pigs, there was no significant difference (P>0.05) among the varying particle sizes of soybean meals, whereas the digestibilities of dry matter, CP and non-protein nitrogen by the in-vitro digestion trial were clearly lower (P<0.05) in soybean flakes (unground) than soybean flakes in fine and beads-size particles.
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  • Nobuyuki SUGIMOTO
    1987 Volume 24 Issue 2 Pages 94-99
    Published: June 30, 1987
    Released on J-STAGE: June 08, 2011
    JOURNAL FREE ACCESS
    The effects of mixing ratio of experimental diet with basal diet upon digestibility of the experimental diet in pigs were investigated in the present study using corn, leaf protein concentrate, beet-pulp and corn silage.
    The digestibility of experimental diet was influenced by varying the mixing ratio of the experimental diet with the basal diet in all the 4 types of experimental diets. The overall judgements on the results, however, revealed that as the mixing ratio of the experimental diet increased, the standard deviations of the digestibility and nutritive values of the experimental diet became smaller and that the nutritive value of the experimental diet reached an almost stable level when the mixing ratio of the experimental diet exceeded 20%.
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  • [in Japanese]
    1987 Volume 24 Issue 2 Pages 100-103
    Published: June 30, 1987
    Released on J-STAGE: June 08, 2011
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1987 Volume 24 Issue 2 Pages 104
    Published: June 30, 1987
    Released on J-STAGE: June 08, 2011
    JOURNAL FREE ACCESS
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  • D. S. HARBISON
    1987 Volume 24 Issue 2 Pages 105-109
    Published: June 30, 1987
    Released on J-STAGE: June 08, 2011
    JOURNAL FREE ACCESS
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  • T. K. Cheng
    1987 Volume 24 Issue 2 Pages 111-112
    Published: June 30, 1987
    Released on J-STAGE: June 08, 2011
    JOURNAL FREE ACCESS
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  • [in Japanese], [in Japanese], [in Japanese]
    1987 Volume 24 Issue 2 Pages 113-115
    Published: June 30, 1987
    Released on J-STAGE: June 08, 2011
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1987 Volume 24 Issue 2 Pages 116-118
    Published: June 30, 1987
    Released on J-STAGE: June 08, 2011
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1987 Volume 24 Issue 2 Pages 119-120
    Published: June 30, 1987
    Released on J-STAGE: June 08, 2011
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1987 Volume 24 Issue 2 Pages 121-123
    Published: June 30, 1987
    Released on J-STAGE: June 08, 2011
    JOURNAL FREE ACCESS
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  • 1987 Volume 24 Issue 2 Pages 124-137
    Published: June 30, 1987
    Released on J-STAGE: June 08, 2011
    JOURNAL FREE ACCESS
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