Relationship between results of embryo recovery, feeding management and ratio of blood urea nitrogen to blood glucose in Japanese Black cows with superovulatory treatment
2008
Hosokawa, Y.(Iwate-ken. Agricultural Research Center, Takizawa (Japan). Animal Industry Research Inst.) | Fukunari, K. | Yoshikawa, Y. | Sato, Y. | Kikuchi, Y.
The connection that blood-biochemical values and the results of embryo recovery collected from Japanese Black cows (n=30) have with the rates of NFC and DIP (NFC/DIP) in the feed were examined using regression analysis. Blood urea nitrogen (BUN, P0.05) and the ratio of BUN to blood glucose (B/G, P0.01) at the initiation of superovulatory treatment showed a negative correlation with the number and rate of transferable embryos. The B/G level showed a negative correlation with the ratio of NFC/DIP in the feed. Moreover, the number of cows with a 70% rate of transferable embryos significantly increased (P0.05) when the values of BUN and B/G were 13mg/dl and 0.2, respectively. When the feed was changed at the time of estrus before superovulation treatment, the number and rate of transferable embryos were significantly higher in the high NFC/DIP group (NFC/DIP 5) than in the low NFC/DIP group (P0.05).
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