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Impotence, mainly due to lack of libido, was found in 24% of 871 rams in A.I. centres and 18% of 1217 rams owned by farmers' cooperatives. After s/c injection of 1% aqueous solution of morphine hydrochloride normal reproductive behaviour was exhibited by 82 of 100 rams 18 months old and by 57% of...

Mintschev, P.; Bakardshiev, K.; Shekov, V.
Zuchthygiene, 1972, 7, No. 3, pp 116-123