Effect of Hydrocarbon Yeast as Dietary Protein Source on Reproducibility of Breeding Hens

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Other Title
  • 炭化水素酵母が飼料蛋白質給源として種鶏の繁殖能力におよぼす影響
  • タンカスイソ コウボ ガ シリョウ タンパクシツ キュウゲン ト シテ シュケイ ノ シゲル ノウリョク ニ オヨボス エイキョウ 2 2ダイ オヨビ 3ダイ ケイ ノ セイセキ ニ ツイテ
  • II. Performance of the Second and Third Generation
  • II. 2代および3代鶏の成績について

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Collaborative expriments were carried out with National Institute of Animal Industry and 6 Prefectural Experiment and Breeding Stations on the effect of hydrocarbon yeast grown on n-paraffin on reproducibility of breeding hens. In each station, about 200 female and 30 male one-day-old White Leghorn chicks were divided into equal two groups. Control diet was fed to a group and yeast diet containing 15% of one of 4 yeasts produced by 4 companies in this country was fed to the other. Mating females and males on the same diet, chicks of the second generation were obtained and reared similarly by feeding the same diet as fed to their parents. Chicks of the third generation were obtained and reared under the same experimental plan.<br>Chicks of the first generation were reared for 52 weeks, during which 3 hatchability tests were carried out. After 52 weeks of age, 10 hens each from each of 2 groups per Station, i.e. 120 hens in total, were sacrificed for histo-pathological examination. Chicks of the second and third generations were reared for 44 and 36 weeks, respectively, with 2 and 1 hatchability tests, respectively.<br>Summarizing the data of 3 generations with total 4, 318 chicks and 6 hatchability tests with 40, 592 eggs, following conclusions were obtained:<br>1) Little difference was observed on egg production, feed intake and feed conversion during laying period, average egg weight and body weight at 36 weeks of age between two groups fed either control or yeast diets.<br>2) Fertility and hatchability of fertile eggs on the yeast diet was slightly higher than those on the control diet, though the difference was not significant statistically. All of the chicks hatched were healthy and no deformity was observed. Little difference was found on mortality of the chicks until 20 weeks of age.<br>3) Viability of hens on the yeast diet was slightly but significantly (P<0.05) higher than that on the control diet.<br>4) Growth rate of the chicks on the yeast diet was significantly (P<0.01) slower than that on the control diet. Sexual maturity of the chicks on the yeast diet was 3 days later (P<0.05) than that on the control diet. One of the reasons of these differences was suspected to be due to the difference in energy and protein levels between the two experimental diets.

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