Research Article

Effects of a Commercial Canine Gonadotropin Releasing Hormone Vaccination on Intact Male Llamas and Alpacas

Table 1

The criteria used for scoring changes within the seminiferous epithelium of vaccinated llamas at each time point, adapted from Yoshida et al. [10].

ScoreCriteria

12Many late spermatids or spermatozoa ( 10) present
11Only a few late spermatids or spermatozoa (<10) present
10No spermatozoa and no late spermatids, but many round spermatids ( 10) present
9No spermatozoa and no late spermatids, but only a few round spermatids (<10) are present
8No spermatozoa and no spermatids, but many secondary spermatocytes ( 10) are present
7No spermatozoa and no spermatids, but only a few secondary spermatocytes (<10) are present
6No spermatozoa, no spermatids, no secondary spermatocytes, but many primary spermatocytes ( 10) are present
5No spermatozoa, no spermatids, no secondary spermatocytes, but only a few primary spermatocytes (<10) are present
4No spermatozoa, no spermatids, no spermatocytes, many spermatogonia (>10) are present
3Only germ cells present are a few spermatogonia (<10)
2Absence of germ cells, but Sertoli cells are present
1Total absence of cells in tubular section