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KMID : 1005220070220010015
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Journal of Embryo Transfer
2007 Volume.22 No. 1 p.15 ~ p.19
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Relationship between Body Condition Score (BCS), Blood Urea Nitrogen(BUN) Concentration and Estrous Expression in Holstein Cows
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Son Jun-Kyu
Baek Kwang-Soo
Ahn Byeong-Seog
Kim H. S.
Park Choon-Keun
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Abstract
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The objective of this study was to investigate the relationship between body condition score (BCS), blood urea nitrogen (BUN) and estrous expression for the purpose of improving reproductive performance. In total, 37 ovulations and 28 estrous detection were observed among 51 Holstein-Friesian dairy cows. The estrous inducement rate and estrous expression rate were significantly lower for cows with BCS below 2.0 than for cows with BCS above 2.0. There was 0% of rate of standing heat in cows with BCS below 2.0 whereas the rate of standing heat was markedly increased in cows with BCS above 2.0 (46.7% and 64.7% for BCS $2.0{\sim}2.49$ and BCS $2.5{\sim}3.0$ cows, respectively). The estrous expression rate was significantly lower for cows with BUN below 10mg/dl than for cows with BUN above 10mg/dl. There was no significant difference among duration time of estrus, estrous behavior patterns and BUN concentration. The rate of estrous expression and concentration of BUN was not significantly different between primiparous and multiparous cows. This result shows that the level of BCS and BUN affect the estrous expression. Considering the situation that estrous expression is decreased in recent years, effective nutritional management should be accompanied to improve reproductive performance.
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KEYWORD
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Holstein cows, blood urea nitrogen, body condition score, estrous behavior
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