[Seasonal variation in the testis diameter and sperm morphology in the Vendean ram and Texel ram].

Nineteen Vendean (V) rams (7 yearlings about 15 months old and 12 adults of greater than 2 years) and 13 Texel (T) adult (greater than 2 years) rams were controlled for body weight (BW), testis diameter (TD) and sperm morphology for two consecutive years (1982 and 1983) from February to June (T) or July (V) and from September to November the first year, from February to June and from September to October the second year. BW was recorded every month. TD was measured once weekly using a caliper.