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| 概要 |
黒毛和種雌経産牛11頭を用いて，ビタミン・ミネラル含有製剤（VM剤）の経口投与が繁殖成績に及ぼす影響について検討した．VM剤として市販品の「DCベータ」50gをフスマ450gと混合して給与した．VM剤給与の結果，給与前は4.3回の人当授精でも受胎しなかった7頭の牛群が給与後は2.1回の人工授精で受胎した．個体別に見ると，7頭のうち4頭が1回目の人工授精で受胎したが，受胎までに6回の人工授精を必要と...した個体も1頭あった．また，離乳と同時にVM剤を給与した4頭の牛群では，2.2回の人工授精で受胎した．これら4頭のうち3頭が1回目の人工授精で受胎した．以上の結果より，VM剤の経口投与は，放牧飼養された黒毛和種雌繁殖牛の受胎までの人工授精回数を減少させ，繁殖成績を向上させることが示唆された．
This study was conducted to evaluate the effects of the oral administration of vitamin and mineral (VM) product on the reproduction performance of Japanese black heifers raised in pasture for all seasons. A commercially obtainable VM containing product (50g) was mixed with wheat bran (450g) and fed once daily. VM administration for 7 heifers that had not conceived by 4.3 services of artificial insemination (AI) after the last parturition resulted them to become pregnant by another 2.1 AI services. The other group of 4 heifers that received VM administration from the time of weaning became pregnant by 2.2 AI. The effect was generally seemed to be soon, because four out of 7 heifers in the former group and three out of 4 in the latter group conceived by the first AI service after VM administration. From these results, it is suggested that the VM product is effective to improve reproduction performance by shortening the interval to conception after parturition in Japanese black heifers raised in pasture for all seasons.続きを見る
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