和牛3品種の産子性比について

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  • Offspring sex ratio in Japanese cattle

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The data used in this survey were obtained from the calving record of Japanese cattle in Akita Prefecture, during the years 196871.<BR>The sex ratio of offsprings was 52.2±0.43 in the Japanese Black, 47.1±0.85 in the Japanese Brown and 51.2±1.23 in the Japanese Shorthorn. The total sex ratio combined these three breeds was 51.2±0.37. The ratio in the Brown breed was significantly lower than those in the other two breeds.<BR>Of a total of 117 bulls, each produced 10 to 2, 484 offsprings, 13 showed a high (shifting to male) or low (shifting to female) sex ratio of their offsprings. Especially, two bulls of the Brown breed exhibited lower sex ratios (40.1±3.0 and 31.0±4.3).<BR>In the Black and Brown breeds, the sex ratios in artificial insemination were lower than those in natural mating. The differences, however, were insignificant in both the breeds.<BR>Seasonal difference in sex ratio was significant only in the Brown breed with a low ratio (43.5) in summer.

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