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This study was designed to evaluate the effect on fertility of 0.4 mg. per 1b. body weight per day of MAP when given under controlled conditions to 15- to 18-mth-old Holstein heifers weighing 630-825 1b. ; the animals were concurrently under trial in a nutritional experiment (2 types of hay). MAP...

Fahning, M. L.; Schultz, R. H.; Graham, E. F.; Donker, J. D.; Mohrenweiser, H. W.
Journal of Reproduction and Fertility, 1966, 12, pp 569-571