炭化水素酵母の給与が鶏の臓器および卵の品質におよぼす影響

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  • Effect of Feeding Yeast Grown on n-Paraffin on Organs of Hens and on Quality of Eggs Laid
  • タンカスイソ コウボ ノ キュウヨ ガ ニワトリ ノ ゾウキ オヨビ タマゴ ノ ヒンシツ ニ オヨボス エイキョウ

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Among the purposes of multi-generation experiment1-4) carried out in cooperation with National Institute of Animal Industry, National Institute of Animal Health and six Prefectural Poultry Experiment or Breeding Stations, one was to examine the effect of yeast grown on n-paraffin on health and welfare of hens, cocks and their offspring and another was to get information on the safety of the eggs and meat produced on the yeast feeding as human food. For these purposes, the hens fed a control diet or a diet containing 15% of the yeast were sacrificed for post-mortem examination and weight of their organs were measured. Further, quality of eggs laid by these hens were examined.<br>1. Weights of the liver, heart and lung either per head or per kg of body weight were identical between the hens on the control and the yeast diets. Average weights of total 363 hens were 40, 8.1 and 8.9g/head, respectively.<br>2. Average weights of the kidney of the hens on the control and yeast diets were 13.7 and 14.1g/head, of which difference was not significant, but the difference of weight/kg body weight was significant statistically. On the contrary, average weights of the spleen on the control and yeast diets were 2.3 and 2.1g/head, respectively, of which difference was significant statistically, but the difference of weight/kg body weight was not significant.<br>3. Weight of ovary and oviduct on the yeast diet were heavier than those on the control diet, but the data were the average of only 30 and 20 hens, respectively, in one of the six stations.<br>4. Gizzard on the yeast diet was well developed and significantly heavier than that on the control diet. No significant difference was observed in the weights of the glandular stomach and abdominal fat and in the serum protein level.<br>5. No difference was observed in yolk index and Haugh unit of eggs on the control and yeast diets. Yolk color of the eggs on the yeast diet, determined using Roche color fan, was slightly but significantly inferior to that on the control diet, although it was 9.10 in average indicating excellent and favorable color. Egg shell on the yeast diet was 0.01mm thinner than that on the control diet, though it was 9.31mm in average, indicating normal shell thickness. High phosphorus level in the yeast diet may be attributable to the difference in shell thickness.

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