RELATIONSHIP BETWEEN SERUM TOTAL CHOLESTEROL LEVEL AND THE NUMBER OF TRANSFERABLE EMBRYOS IN RELATION TO MILK YIELD IN SUPEROVULATED COWS

概要

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Superovulation was induced in 254 Holstein cows with gonadotropins between days 9 and 14 of the estrous cycle. Dry and milking cows which produced less than 30kg/day were classified into two groups, one having a total cholesterol (T-CHO) level of less than 130mg/dl, and the other having a level of 130mg/dl and over. In milking cows which produced 30kg and over, the grouping level was 170mg/dl. In dry and milking cows which produced less than 30 kg/day, the percentages of cows which produced more than 3 transferable embryos were 28.2% (22/78) of the cows that had less than 130mg/dl of T-CHO, and 52.5% (21/40) of those that had 130mg/dl and over (P<0.01). In the milking cows which produced 30kg/day and over, the percentages were 36.4% (4/11) and 69.2% (18/26) in those which had T-CHO levels of less than 170mg/dl and of 170mg/dl and over, respectively. However, in dry and milking cows which received APG (bovine anterior pituitary extracts) as an ovulation stimulating preparation, the results were different from those obtained from the cows which had not received the extracts. The present results indicate that milk yield should be considered when T-CHO level is used as a preselection criterion for good ovarian response in Holstein cows.
北海道大学の論文
1987-04-30