| Project/Area Number |
62560254
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
畜産学(含草地学)
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| Research Institution | OBIHIRO UNIVERSITY OF AGRICULTURE AND VETERINARY MEDICINE |
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Principal Investigator |
YOZO SHINDE OBIHIRO UNIVERSITY OF AGRICULTURE AND VETERINARY MEDICINE, 畜産学部, 教授 (70003085)
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| Project Period (FY) |
1987 – 1988
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| Project Status |
Completed (Fiscal Year 1988)
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| Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1988: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1987: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Keywords | GROWTH HORMONE / MILK YIELD / FEED EFFICIENCY / METABOLISM / 栄養分の分配 / 乳牛の体組織の動員 / 泌乳とホルモン / 乳牛の代謝 / 増乳 |
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| Research Abstract |
BOVINE GROWTH HORMONE(52 IU/ DAY) AND SALINE INJECTIONS WERE ADMINISTERED TO FOUR HOLSTEIN COWS IN EARLY, MIDDLE AND LATE LACTATION. GROWTH HORMONE INCREASED MILK YIELD BY 2.6KG/DAY, 4.2KG/DAY, AND 3.4KG/DAY RESPECTIVELY. FEED INTAKE WAS NOT CHANGED IN EARLY, MIDDLE AND LATE STAGE OF LACTATION. AS A RESULT,COWS RECEIVING GROWTH HORMONE WERE 7-22% MORE EFFICIENT THAN CONTROLS FOR CONVERSION OF FEED TO MILK. CONCENTRATIONS IN PLASMA OF FREE FATTY ACIDS WERE HIGHER DURING GROWTH HORMONE TREATMENT IN MIDDLE AND LATE LACTATION BUT NOT IN EARLY LACTATION. DURING EARLY LACTATION THE ABILITY OF COWS TO INCREASE NILK YIELD IN RESPONSE TO EXOGENOUS GROWTH HORMONE MAY BE LIMITED BY ABILITY TO MOBILIZE BODY RESERVES IN SUPPORT OF LACTATION. HEART RATE INCREASED AND BODY TEMPETATURE DECREASES CONCURRENTLY WITH GROWTH HORMONE ADMINISTRATION. GROWTH HORMONE ADMINISTRATION DID NOT AFFECT THE PERCENTAGE OF MILK COMPOSITION. RESULTS INDICATE THAT GROWTH HORMONE INCREASES BODY METABOLISM RATE AND COORDINATES AN ARRAY OF PHYSIOLOGICAL PROCESSES SO THAT NUTRIENTS ARE PARTITIONED FOR MILK SYNTHESIS.
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