...So great is theireconomic value that their retention in the game list and theirdestruction by sportsmen is a serious loss to agriculture...
William T. Hornaday 「Our Vanishing Wild Life」
...However, retention of spermatozoa and delayed fertilization indicate that copulation is not a stimulus for ovulation...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...Sperm retention and delayed fertilization allow young to be produced without copulation occurring in each breeding season...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...Ergoted, smutty, or musty fodder (),by causing abortion, is a frequent cause of retention...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...As a result of this sloughing of the tissues and the retention of foodin the mouth, a very offensive odor is exhaled...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
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