タイトル |
肥育牛へのビタミンA剤経口投与による肥育中期の血中ビタミンA濃度コントロール方法 |
担当機関 |
鹿児島畜試 |
研究期間 |
2001~2004 |
研究担当者 |
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発行年度 |
2004 |
要約 |
肥育中期において血中ビタミンA濃度の低下により飼料摂取量や日増体量が減少した場合、2週間間隔で体重1kg当たり10.6IU/日のビタミンAを7日間経口投与しすることで血中ビタミンA濃度を40~60IU/dLにコントロールでき、同時に飼料摂取量を維持させることができる。
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キーワード |
ウシ、肉用牛、ビタミンA、飼料摂取量
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背景・ねらい |
黒毛和種の肥育では、肥育中期におけるビタミンA(VA)の給与を制限し、16~21ヵ月齢時の血中VA濃度を40~60IU/dLにコントロールすることで脂肪交雑を向上させる肥育技術が普及している。しかし、VAの制限が厳しすぎると夜盲症、発育不良および筋肉水腫が発生することが報告されている。また、肥育農家ではVA欠乏時に添加するVA給与量が多すぎるために血中VA濃度を40~60IU/dLに制御できず肉質向上につながっていない農家もみられる。そこで、VA給与の制限を行いながら飼養した黒毛和種去勢肥育牛においてVA欠乏症状発生時に、VAを給与し、VA給与量が血中VA濃度の上昇状況、飼料摂取量および日増体量に及ぼす影響を明らかにする。
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成果の内容・特徴 |
- 血中VA濃度が26IU/dLまで低下した去勢肥育牛(平均19.8ヵ月齢、6頭)に、体重1kg当たり10.6IU/日に相当するVA製剤を7日間経口投与した結果、血中VA濃度が51IU/dLまで上昇し、飼料摂取量も1頭当たり1.4kg増加した(図1、図2)。また、日増体量もVA添加前と比べ0.38kg/日の増加がみられた(図3)。しかし、VAの添加終了後14日目の血中VA濃度はVA添加前の値まで低下し、同時に飼料摂取量も減少するため、14日目以降にVAを再度添加給与し、血中VA濃度をコントロールしながら飼料摂取量を維持する必要がある(図1、図2、図3)。
- 血中VA濃度が21IU/dLまで低下した黒毛和種去勢肥育牛(平均22.1ヵ月齢、6頭)に、体重1kg当たり21.2IU/日に相当するVA製剤を7日間経口投与した結果、血中VA濃度が69IU/dLまで上昇し、飼料摂取量も1頭当たり2.6kg増加した(図4、図5)。また、日増体量もVA製剤投与前と比べ0.45kg/日の増加がみられた(図6)。
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成果の活用面・留意点 |
- 肥育中期の血中VA濃度を40~60IU/dL程度に維持したい時期(16~21ヵ月齢)には、体重1kg当たり10.6IU/日量のVA製剤を7日間給与する方法が有効である。
- 体重1kg当たり10.6IU/日量のVA製剤の添加終了後14日目の血中VA濃度はVA添加前の値まで低下し、同時に飼料摂取量も減少することから14日目以降にVAを再度添加する必要がある。
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図表1 |
![222690-1.jpg](https://s3-agre-content.s3.ap-northeast-1.amazonaws.com/assets/images/seika_chart/222690-1.jpg?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Security-Token=IQoJb3JpZ2luX2VjEHcaDmFwLW5vcnRoZWFzdC0xIkgwRgIhAJkL7ZjHCCdOZbxhE%2FNlse5yf5kkFaQVKMVjMn0ffPfiAiEA9EiwQVC3qVezlLHm6Hb0LwW1izUm%2Bnp4MPdyBoOju8EqkAQIMBACGgw1MzIzMzEwNzIwNDEiDCX9CyukOw1QEUNy%2FCrtA34iYLvaC2gUzqVEAoAebgA3BvPg3jHnXf93%2FCATJghkRwhkESkZEC%2B88zQeK5GWVS9QXfUhFUGF3Ldmw6seiNOpZm3yvpJ7jVIrez8qCZICQoX%2F%2FP9zmNAdvMFd6pC%2BeoYBCMsu8T5%2F%2FmscJNjCV4qYz%2F8oiKS8XQP7p6qCBE91MKL47pNQel7bBZN7bip4KdMMP9ZO13IUv0KEzVi4ZP4j4C4vytG%2BA1ZAbfTpExtmdKJgcaoLBdEBO0b24J9y25IflOUC6qRL4%2FoBjwkqpneYQcxJ698AGWe3zACcpQFqtThUrhzFeb299iusElNyDXLKVExbR96ft%2FiEZZa68ew7Z%2BtUxJ3lePTMjokUI042BC3OX8t%2BjHR2yNEsu7D6R8zo%2BXI6jdj%2FdRjeWrY47x8KBHdLL515m44KYQ05GsR8RdSXvsEGSMjBpAY5Lc%2BVnWkGxoPFboKuRaiHSo8l3JmTiAnqsy8egTEIXHL7BJvktpTKJIgBIO3GP4Z6072WrNbipASBW3Loy235PpehnpZd90%2Fno6YXIDFNHMfBOXaXwmZp%2B%2BJVxBVd6xvvrBqkdi9Yhk1UChuq4iiCCyxKuhoGiMP3aIqcGn5u%2BIXex8mwrlMu0J3RkMRjq%2BpGZaYiEL7wxQG7NKi2nAlItGUw0MyAtAY6pQEv2nNBWcOEEKD6Nzx4GT1MlT5%2Fq6r82%2FIp3hnoU7dvoJPRuQYL1oCIEMHyxWo6jJ0WEk4Dt%2BjblhwaMhBN%2FrbNyOoNGuNRpnV%2BxMFdGBZnxuFKC86oelNqJNemOLO9exEzgIhpNxA4UkZG22zOnz3Gv%2Fv4VpnkP4%2FVTb5sWL9NY2g1lrRcqWb0AComaeE3d4hS%2Ba4Q2R%2Bdp%2Bi3dqLzXGYcQurFx9c%3D&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=ASIAXX4LHRIURW4BK75E%2F20240629%2Fap-northeast-1%2Fs3%2Faws4_request&X-Amz-Date=20240629T154634Z&X-Amz-SignedHeaders=host&X-Amz-Expires=1800&X-Amz-Signature=a19a85e0eaa3870915c7276cb9c4b3af809ef592d7dd9a4415372fc310040ac6) |
図表2 |
![222690-2.jpg](https://s3-agre-content.s3.ap-northeast-1.amazonaws.com/assets/images/seika_chart/222690-2.jpg?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Security-Token=IQoJb3JpZ2luX2VjEHcaDmFwLW5vcnRoZWFzdC0xIkgwRgIhAJkL7ZjHCCdOZbxhE%2FNlse5yf5kkFaQVKMVjMn0ffPfiAiEA9EiwQVC3qVezlLHm6Hb0LwW1izUm%2Bnp4MPdyBoOju8EqkAQIMBACGgw1MzIzMzEwNzIwNDEiDCX9CyukOw1QEUNy%2FCrtA34iYLvaC2gUzqVEAoAebgA3BvPg3jHnXf93%2FCATJghkRwhkESkZEC%2B88zQeK5GWVS9QXfUhFUGF3Ldmw6seiNOpZm3yvpJ7jVIrez8qCZICQoX%2F%2FP9zmNAdvMFd6pC%2BeoYBCMsu8T5%2F%2FmscJNjCV4qYz%2F8oiKS8XQP7p6qCBE91MKL47pNQel7bBZN7bip4KdMMP9ZO13IUv0KEzVi4ZP4j4C4vytG%2BA1ZAbfTpExtmdKJgcaoLBdEBO0b24J9y25IflOUC6qRL4%2FoBjwkqpneYQcxJ698AGWe3zACcpQFqtThUrhzFeb299iusElNyDXLKVExbR96ft%2FiEZZa68ew7Z%2BtUxJ3lePTMjokUI042BC3OX8t%2BjHR2yNEsu7D6R8zo%2BXI6jdj%2FdRjeWrY47x8KBHdLL515m44KYQ05GsR8RdSXvsEGSMjBpAY5Lc%2BVnWkGxoPFboKuRaiHSo8l3JmTiAnqsy8egTEIXHL7BJvktpTKJIgBIO3GP4Z6072WrNbipASBW3Loy235PpehnpZd90%2Fno6YXIDFNHMfBOXaXwmZp%2B%2BJVxBVd6xvvrBqkdi9Yhk1UChuq4iiCCyxKuhoGiMP3aIqcGn5u%2BIXex8mwrlMu0J3RkMRjq%2BpGZaYiEL7wxQG7NKi2nAlItGUw0MyAtAY6pQEv2nNBWcOEEKD6Nzx4GT1MlT5%2Fq6r82%2FIp3hnoU7dvoJPRuQYL1oCIEMHyxWo6jJ0WEk4Dt%2BjblhwaMhBN%2FrbNyOoNGuNRpnV%2BxMFdGBZnxuFKC86oelNqJNemOLO9exEzgIhpNxA4UkZG22zOnz3Gv%2Fv4VpnkP4%2FVTb5sWL9NY2g1lrRcqWb0AComaeE3d4hS%2Ba4Q2R%2Bdp%2Bi3dqLzXGYcQurFx9c%3D&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=ASIAXX4LHRIURW4BK75E%2F20240629%2Fap-northeast-1%2Fs3%2Faws4_request&X-Amz-Date=20240629T154634Z&X-Amz-SignedHeaders=host&X-Amz-Expires=1800&X-Amz-Signature=0d8b58226efdb97b0d56e742c15fd0fd2c55c1b36dc69e94ce9f8cc728aa79a5) |
図表3 |
![222690-3.jpg](https://s3-agre-content.s3.ap-northeast-1.amazonaws.com/assets/images/seika_chart/222690-3.jpg?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Security-Token=IQoJb3JpZ2luX2VjEHcaDmFwLW5vcnRoZWFzdC0xIkgwRgIhAJkL7ZjHCCdOZbxhE%2FNlse5yf5kkFaQVKMVjMn0ffPfiAiEA9EiwQVC3qVezlLHm6Hb0LwW1izUm%2Bnp4MPdyBoOju8EqkAQIMBACGgw1MzIzMzEwNzIwNDEiDCX9CyukOw1QEUNy%2FCrtA34iYLvaC2gUzqVEAoAebgA3BvPg3jHnXf93%2FCATJghkRwhkESkZEC%2B88zQeK5GWVS9QXfUhFUGF3Ldmw6seiNOpZm3yvpJ7jVIrez8qCZICQoX%2F%2FP9zmNAdvMFd6pC%2BeoYBCMsu8T5%2F%2FmscJNjCV4qYz%2F8oiKS8XQP7p6qCBE91MKL47pNQel7bBZN7bip4KdMMP9ZO13IUv0KEzVi4ZP4j4C4vytG%2BA1ZAbfTpExtmdKJgcaoLBdEBO0b24J9y25IflOUC6qRL4%2FoBjwkqpneYQcxJ698AGWe3zACcpQFqtThUrhzFeb299iusElNyDXLKVExbR96ft%2FiEZZa68ew7Z%2BtUxJ3lePTMjokUI042BC3OX8t%2BjHR2yNEsu7D6R8zo%2BXI6jdj%2FdRjeWrY47x8KBHdLL515m44KYQ05GsR8RdSXvsEGSMjBpAY5Lc%2BVnWkGxoPFboKuRaiHSo8l3JmTiAnqsy8egTEIXHL7BJvktpTKJIgBIO3GP4Z6072WrNbipASBW3Loy235PpehnpZd90%2Fno6YXIDFNHMfBOXaXwmZp%2B%2BJVxBVd6xvvrBqkdi9Yhk1UChuq4iiCCyxKuhoGiMP3aIqcGn5u%2BIXex8mwrlMu0J3RkMRjq%2BpGZaYiEL7wxQG7NKi2nAlItGUw0MyAtAY6pQEv2nNBWcOEEKD6Nzx4GT1MlT5%2Fq6r82%2FIp3hnoU7dvoJPRuQYL1oCIEMHyxWo6jJ0WEk4Dt%2BjblhwaMhBN%2FrbNyOoNGuNRpnV%2BxMFdGBZnxuFKC86oelNqJNemOLO9exEzgIhpNxA4UkZG22zOnz3Gv%2Fv4VpnkP4%2FVTb5sWL9NY2g1lrRcqWb0AComaeE3d4hS%2Ba4Q2R%2Bdp%2Bi3dqLzXGYcQurFx9c%3D&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=ASIAXX4LHRIURW4BK75E%2F20240629%2Fap-northeast-1%2Fs3%2Faws4_request&X-Amz-Date=20240629T154634Z&X-Amz-SignedHeaders=host&X-Amz-Expires=1800&X-Amz-Signature=ef0fcc79371b79a7b968bd38d09d5c4ae5d7c9888bdb01bf19392e9b3b55b07a) |
図表4 |
![222690-4.jpg](https://s3-agre-content.s3.ap-northeast-1.amazonaws.com/assets/images/seika_chart/222690-4.jpg?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Security-Token=IQoJb3JpZ2luX2VjEHcaDmFwLW5vcnRoZWFzdC0xIkgwRgIhAJkL7ZjHCCdOZbxhE%2FNlse5yf5kkFaQVKMVjMn0ffPfiAiEA9EiwQVC3qVezlLHm6Hb0LwW1izUm%2Bnp4MPdyBoOju8EqkAQIMBACGgw1MzIzMzEwNzIwNDEiDCX9CyukOw1QEUNy%2FCrtA34iYLvaC2gUzqVEAoAebgA3BvPg3jHnXf93%2FCATJghkRwhkESkZEC%2B88zQeK5GWVS9QXfUhFUGF3Ldmw6seiNOpZm3yvpJ7jVIrez8qCZICQoX%2F%2FP9zmNAdvMFd6pC%2BeoYBCMsu8T5%2F%2FmscJNjCV4qYz%2F8oiKS8XQP7p6qCBE91MKL47pNQel7bBZN7bip4KdMMP9ZO13IUv0KEzVi4ZP4j4C4vytG%2BA1ZAbfTpExtmdKJgcaoLBdEBO0b24J9y25IflOUC6qRL4%2FoBjwkqpneYQcxJ698AGWe3zACcpQFqtThUrhzFeb299iusElNyDXLKVExbR96ft%2FiEZZa68ew7Z%2BtUxJ3lePTMjokUI042BC3OX8t%2BjHR2yNEsu7D6R8zo%2BXI6jdj%2FdRjeWrY47x8KBHdLL515m44KYQ05GsR8RdSXvsEGSMjBpAY5Lc%2BVnWkGxoPFboKuRaiHSo8l3JmTiAnqsy8egTEIXHL7BJvktpTKJIgBIO3GP4Z6072WrNbipASBW3Loy235PpehnpZd90%2Fno6YXIDFNHMfBOXaXwmZp%2B%2BJVxBVd6xvvrBqkdi9Yhk1UChuq4iiCCyxKuhoGiMP3aIqcGn5u%2BIXex8mwrlMu0J3RkMRjq%2BpGZaYiEL7wxQG7NKi2nAlItGUw0MyAtAY6pQEv2nNBWcOEEKD6Nzx4GT1MlT5%2Fq6r82%2FIp3hnoU7dvoJPRuQYL1oCIEMHyxWo6jJ0WEk4Dt%2BjblhwaMhBN%2FrbNyOoNGuNRpnV%2BxMFdGBZnxuFKC86oelNqJNemOLO9exEzgIhpNxA4UkZG22zOnz3Gv%2Fv4VpnkP4%2FVTb5sWL9NY2g1lrRcqWb0AComaeE3d4hS%2Ba4Q2R%2Bdp%2Bi3dqLzXGYcQurFx9c%3D&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=ASIAXX4LHRIURW4BK75E%2F20240629%2Fap-northeast-1%2Fs3%2Faws4_request&X-Amz-Date=20240629T154634Z&X-Amz-SignedHeaders=host&X-Amz-Expires=1800&X-Amz-Signature=c7b974988267886c3a849e29920c7fa6068b1354460231e764b2cf5747515839) |
図表5 |
![222690-5.jpg](https://s3-agre-content.s3.ap-northeast-1.amazonaws.com/assets/images/seika_chart/222690-5.jpg?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Security-Token=IQoJb3JpZ2luX2VjEHcaDmFwLW5vcnRoZWFzdC0xIkgwRgIhAJkL7ZjHCCdOZbxhE%2FNlse5yf5kkFaQVKMVjMn0ffPfiAiEA9EiwQVC3qVezlLHm6Hb0LwW1izUm%2Bnp4MPdyBoOju8EqkAQIMBACGgw1MzIzMzEwNzIwNDEiDCX9CyukOw1QEUNy%2FCrtA34iYLvaC2gUzqVEAoAebgA3BvPg3jHnXf93%2FCATJghkRwhkESkZEC%2B88zQeK5GWVS9QXfUhFUGF3Ldmw6seiNOpZm3yvpJ7jVIrez8qCZICQoX%2F%2FP9zmNAdvMFd6pC%2BeoYBCMsu8T5%2F%2FmscJNjCV4qYz%2F8oiKS8XQP7p6qCBE91MKL47pNQel7bBZN7bip4KdMMP9ZO13IUv0KEzVi4ZP4j4C4vytG%2BA1ZAbfTpExtmdKJgcaoLBdEBO0b24J9y25IflOUC6qRL4%2FoBjwkqpneYQcxJ698AGWe3zACcpQFqtThUrhzFeb299iusElNyDXLKVExbR96ft%2FiEZZa68ew7Z%2BtUxJ3lePTMjokUI042BC3OX8t%2BjHR2yNEsu7D6R8zo%2BXI6jdj%2FdRjeWrY47x8KBHdLL515m44KYQ05GsR8RdSXvsEGSMjBpAY5Lc%2BVnWkGxoPFboKuRaiHSo8l3JmTiAnqsy8egTEIXHL7BJvktpTKJIgBIO3GP4Z6072WrNbipASBW3Loy235PpehnpZd90%2Fno6YXIDFNHMfBOXaXwmZp%2B%2BJVxBVd6xvvrBqkdi9Yhk1UChuq4iiCCyxKuhoGiMP3aIqcGn5u%2BIXex8mwrlMu0J3RkMRjq%2BpGZaYiEL7wxQG7NKi2nAlItGUw0MyAtAY6pQEv2nNBWcOEEKD6Nzx4GT1MlT5%2Fq6r82%2FIp3hnoU7dvoJPRuQYL1oCIEMHyxWo6jJ0WEk4Dt%2BjblhwaMhBN%2FrbNyOoNGuNRpnV%2BxMFdGBZnxuFKC86oelNqJNemOLO9exEzgIhpNxA4UkZG22zOnz3Gv%2Fv4VpnkP4%2FVTb5sWL9NY2g1lrRcqWb0AComaeE3d4hS%2Ba4Q2R%2Bdp%2Bi3dqLzXGYcQurFx9c%3D&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=ASIAXX4LHRIURW4BK75E%2F20240629%2Fap-northeast-1%2Fs3%2Faws4_request&X-Amz-Date=20240629T154634Z&X-Amz-SignedHeaders=host&X-Amz-Expires=1800&X-Amz-Signature=d127d0bf76a08f6880a8c41b13aa8ced7afbe1985e22c3dc1ab14e5ae167cfb1) |
図表6 |
![222690-6.jpg](https://s3-agre-content.s3.ap-northeast-1.amazonaws.com/assets/images/seika_chart/222690-6.jpg?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Security-Token=IQoJb3JpZ2luX2VjEHcaDmFwLW5vcnRoZWFzdC0xIkgwRgIhAJkL7ZjHCCdOZbxhE%2FNlse5yf5kkFaQVKMVjMn0ffPfiAiEA9EiwQVC3qVezlLHm6Hb0LwW1izUm%2Bnp4MPdyBoOju8EqkAQIMBACGgw1MzIzMzEwNzIwNDEiDCX9CyukOw1QEUNy%2FCrtA34iYLvaC2gUzqVEAoAebgA3BvPg3jHnXf93%2FCATJghkRwhkESkZEC%2B88zQeK5GWVS9QXfUhFUGF3Ldmw6seiNOpZm3yvpJ7jVIrez8qCZICQoX%2F%2FP9zmNAdvMFd6pC%2BeoYBCMsu8T5%2F%2FmscJNjCV4qYz%2F8oiKS8XQP7p6qCBE91MKL47pNQel7bBZN7bip4KdMMP9ZO13IUv0KEzVi4ZP4j4C4vytG%2BA1ZAbfTpExtmdKJgcaoLBdEBO0b24J9y25IflOUC6qRL4%2FoBjwkqpneYQcxJ698AGWe3zACcpQFqtThUrhzFeb299iusElNyDXLKVExbR96ft%2FiEZZa68ew7Z%2BtUxJ3lePTMjokUI042BC3OX8t%2BjHR2yNEsu7D6R8zo%2BXI6jdj%2FdRjeWrY47x8KBHdLL515m44KYQ05GsR8RdSXvsEGSMjBpAY5Lc%2BVnWkGxoPFboKuRaiHSo8l3JmTiAnqsy8egTEIXHL7BJvktpTKJIgBIO3GP4Z6072WrNbipASBW3Loy235PpehnpZd90%2Fno6YXIDFNHMfBOXaXwmZp%2B%2BJVxBVd6xvvrBqkdi9Yhk1UChuq4iiCCyxKuhoGiMP3aIqcGn5u%2BIXex8mwrlMu0J3RkMRjq%2BpGZaYiEL7wxQG7NKi2nAlItGUw0MyAtAY6pQEv2nNBWcOEEKD6Nzx4GT1MlT5%2Fq6r82%2FIp3hnoU7dvoJPRuQYL1oCIEMHyxWo6jJ0WEk4Dt%2BjblhwaMhBN%2FrbNyOoNGuNRpnV%2BxMFdGBZnxuFKC86oelNqJNemOLO9exEzgIhpNxA4UkZG22zOnz3Gv%2Fv4VpnkP4%2FVTb5sWL9NY2g1lrRcqWb0AComaeE3d4hS%2Ba4Q2R%2Bdp%2Bi3dqLzXGYcQurFx9c%3D&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=ASIAXX4LHRIURW4BK75E%2F20240629%2Fap-northeast-1%2Fs3%2Faws4_request&X-Amz-Date=20240629T154634Z&X-Amz-SignedHeaders=host&X-Amz-Expires=1800&X-Amz-Signature=e337002ef665cf4b5bfa2dcc7c39896ef02e15e236740037659bf7349d6e9a3e) |
カテゴリ |
肉牛
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