家鶏におけるヘテローシスの研究 : I 生存率におよぼす影響, 特に黒頭病抵抗性について

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概要

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• Two breeds, White Leghorn (WL) and Barred Plymouth Rock (BP), inbred to some extent, were mated within and between the breeds, using 2 males and 24 females from WL and 2 males and 29 females from BP. The number of birds produced from different matings is shown in Table 1. The experimental birds were maintained without any culling up to 18 weeks of age, and every dead bird during this period was autopsied.<BR>The total mortality of experimental female chicks one day to 18 weeks of ago, was considered as growing mortality. Mortality in the pure breeds and in the reciprocal F<SUB>1</SUB> hybrids between them is given in Table 2. The growing mortality of the reciprocal F<SUB>1</SUB> hybrid chicks was lower than that of the pure breed chicks.<BR>Although the difference of 7.2% mortality in thefirst experiment is statistically non-significant, the difference of 30.2% growing mortality in the second experiment is highly signficant at the 1% level.<BR>Important causes of death in the second experiment are summarized in Table 3. It is evident that the main cause of the difference in mortality between parental breeds and the F<SUB>1</SUB> hybrids was the loss by blackhead. Mortality from this disease in the pure breeds was as high as 38.3%(WL =43.0%, BP=31.5%) at 18 weeks of age, while it was only 9.5%(WLρ×BPσ=8.7%, BPρ×WLσ=10.6%) in the F<SUB>1</SUB> hybrid chicks. The difference of 28.8% mortality at 18 weeks of age is statistically highly significant at the 1% level.

• 社団法人 日本畜産学会の論文

著者

• 河原 孝忠

  国立遺伝学研究所

関連論文

• 家鶏におけるヘテローシスの研究 : IV.孵化率に対する影響
• 家鶏におけるヘテローシスの研究 : III. 死亡率に対する影響,特に白血病感受性
• 家鶏におけるヘテローシスの研究 : I 生存率におよぼす影響, 特に黒頭病抵抗性について

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