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KAWASHIMA, Chiho; MUNAKATA, Megumi; SHIMIZU, Takashi; MIYAMOTO, Akio; KIDA, Katsuya; MATSUI, Motozumi; 川島, 千帆; 清水, 隆; 宮本, 明夫; 木田, 克弥; 松井, 基純. |
This study aimed to investigate the effects of insulin resistance (IR) during the close-up dry period on the metabolic status and performance of dairy cows as well as to determine the effects on body weight (BW) and metabolic status of their calves. An insulin tolerance test (ITT) was conducted by administering 0.05 IU/kg BW of insulin to 34 multiparous Holstein cows at 3 weeks prepartum. Blood samples were collected at 0, 30, 45 and 60 min after insulin injection, and cows were divided into two groups based on the time required for glucose to reach the minimum levels [non-IR (NIR), 45 min (n=28); and IR, 60 min (n=6)]. Blood or milk sampling and body condition score (BCS) estimation were performed twice weekly during the experimental period. Blood samples... |
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Palavras-chave: Dairy cow; Dry period; Insulin tolerance test; Metabolic status; Postpartum performance. |
Ano: 2016 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4363 |
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LEE, Hsu-Hsun; KIDA, Katsuya; MIURA, Ryotaro; INOKUMA, Hisashi; MIYAMOTO, Akio; KAWASHIMA, Chiho; HANEDA, Shingo; MIYAKE, Yoh-Ichi; MATSUI, Motozumi; 猪熊, 壽; 宮本, 明夫; 川島, 千帆; 羽田, 真悟; 松井, 基純. |
In peripartum dairy cows, insulin resistance (IR) increases to adjust the direction of energy to lactation after calving. To investigate the effect of prepartum IR on postpartum reproductive performance, the insulin tolerance test (ITT) was applied to 15 cows at 3 weeks (Pre21) and 10 days (Pre10) before the predicted calving date. Blood glucose area under the curve (AUCglu) within 120 min after administration of 0.05 IU/kg-BW insulin was calculated. The occurrence of first ovulation, days to first artificial insemination (AI) and first AI conception rate were recorded. Nutritional status postpartum was evaluated by blood chemical analysis. Based on AUCglu changes from Pre21 to Pre10, cows were classified into either the AUC-up group (AUCglu increase, n=5)... |
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Palavras-chave: Dairy cows; Glucose metabolism; Insulin tolerance test; Reproductive performance; Transition period. |
Ano: 2012 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4129 |
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