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Volume 10, Issue 1
Displaying 1-6 of 6 articles from this issue
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Shin-ichi MIKAMI1973 Volume 10 Issue 1 Pages 1-11
Published: January 25, 1973
Released on J-STAGE: November 12, 2008
JOURNAL FREE ACCESS -
Ryozo ISHIGAKI, Shoji EBISAWA, Kikuo Futamura, Yukio Yamada1973 Volume 10 Issue 1 Pages 12-17
Published: January 25, 1973
Released on J-STAGE: November 12, 2008
JOURNAL FREE ACCESSEffects of forced molting induced by methalibure administered either at 3 months or 7 months after the age of 50% egg production upon subsequent egg production were investigated.
In the group treated at earlier age the level of egg production after the recovery from temporal cessation of egg laying was more or less similar to that of non-treated control, while the group treated at older age showed a marked rebounding of egg production and continued higher production level throughout the testing period (Fig. 2).
Approximately 10% increase in the income through egg marketing can be expected by the use of forced molting conducted at 7 months after the age of 50% production, when the price of eggs is lowest.
The degree of molting by methalibure administration seems to be dependent on the age of pullets or the stage of egg production, since the molting appeared in the primary feather was less severe in the group treated at the earlier age and the recovery to 50% production was hastened in this group in comparison with the group treated 4 months later.View full abstractDownload PDF (615K) -
Minoru YOSHIDA, Hiroshi HOSHII, Daisaku KUBOTA1973 Volume 10 Issue 1 Pages 18-22
Published: January 25, 1973
Released on J-STAGE: November 12, 2008
JOURNAL FREE ACCESSNutritive value of oil meal of Benibana (Carthamus tinctorius L., safflower) produced in Yamagata Prefecture was evaluated by bioassay procedure and by determination of digestibility of protein.
The meal contained 19.8% of crude protein, of which digestibility was 74% and gross protein value was 89. Protein mixture was used as standard protein in the estimation of gross protein value instead of casein. Metabolizable energy of the meal was estimated as 1.79kcal/g, which corresponded to 43.4% of total digestible nutrients.
The energy and protein value was confirmed by a feeding experiment for 39 days, by which unidentified growth promoting effect was suggested in the meal. Palatability of the meal was excellent.View full abstractDownload PDF (644K) -
Minoru YOSHIDA, Hiroshi HOSHII, Shoichi YONEZAWA, Hisashi NAKAMURA, Ry ...1973 Volume 10 Issue 1 Pages 23-28
Published: January 25, 1973
Released on J-STAGE: November 12, 2008
JOURNAL FREE ACCESSThree experiments with 317 male and 40 female meat-type one-day old chicks in total were carried out to determine the residue of tylosin in the blood, breast muscle and liver of the chicks fed the diets containing various levels of tylosin for various weeks and of the chicks after the withdrawal of dietary tylosin. Five chicks at a time were sacrificed to determine the residue individually by microbioassay with Sarcina lutea ATCC 4341.
No residue at all was detected after 8 weeks of tylosin feeding at dietary level less than 1, 000ppm, suggesting that the edible parts was free from tylosin residue on therapeutic use of this antibiotic. Even after feeding extremely high level of dietary tylosin at 8, 000ppm, no tylosin residue was detected in the blood at the first day, and in the muscle at the second day, after the withdrawal of dietary tylosin. The residue of tylosin in the liver disappeared exponentially within 5 days after the withdrawal.
The relationship between days after the withdrawal (T days) and tylosin residue in the liver (y ppm) can be described by the following Equation 1,
log y=0.6658-0.5013 T……(1)
From this equation, biological half life of tylosin was estimated to be 0.6 days with 95% confidence interval between 0.4 and 0.9 days.View full abstractDownload PDF (748K) -
Minoru YOSHIDA, Daisaku KUBOTA, Shoichi YONEZAWA, Hisashi NAKAMURA, Ry ...1973 Volume 10 Issue 1 Pages 29-36
Published: January 25, 1973
Released on J-STAGE: November 12, 2008
JOURNAL FREE ACCESSTylosin was fed to laying hens for 7 days at the dietary levels of 0, 20, 500, 1, 000, 2, 000, 4, 000 and 8, 000ppm, and thereafter, tylosin-free diet was fed to all of the hens for another 7 days. Even at the extremely high level of 8, 000ppm, dietary tylosin had little influence on feed intake, egg production and other performance of the hens during the experimental period.
Tylosin was not detected in either the egg yolk or egg white at the dietary level less than 500ppm. At the higher dietary level than 1, 000ppm, content of tylosin in the whole egg increased curvilinearly with the increase in dietary level of tylosin. After the withdrawal of dietary tylosin, its content in the egg white and in the liver decreased rapidly and no tylosin was detecded after 3 days in the egg white and 7 days in the liver, while that in the egg yolk decreased gradually and disappeared after 7 days.
Biological half life of tylosin in the whole egg was estimated to be 1.3 days, which was significantly longer than 0.6 days, the biological half lives in the egg white and in the livers of both growing chicks and laying hens.View full abstractDownload PDF (989K) -
Jun-ichi OKUMURA, Iwao TASAKI1973 Volume 10 Issue 1 Pages 37-40
Published: January 25, 1973
Released on J-STAGE: November 12, 2008
JOURNAL FREE ACCESS
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