AbstractThe glucosinolate content of three fodder kales, one fodder rape, one semi‐artificial rape and one radicole were determined. The major glucosinolates (mmol kg−1 dry matter) were: in kale leaf, glucobrassicin (3.21) and sinigrin (3.12); in kale stem, sinigrin (5.82); in rape leaf, gluconapin (3.14) and progoitrin (13.99); in rape stem, gluconapin (3.29) and progoitrin (20.18); in semi‐artificial rape leaf, gluconapin (25.64) and progoitrin (9.00); in semi‐artificial rape stem, gluconapin (35.33) and progoitrin (12.08); in radicole leaf, progoitrin (4.74) and glucobrassicin (3.28); and in radicole stem, gluconapin (3.26) and progoitrin (5.53). The implications for plant breeding are discussed.