Responsa על תענית 61:14

They responded: There is a great principle in the kashrut of animals: "One who adds, will have added life, and one who does not add, let him be gathered away." (Taanit 31a.4) It seems from this that one who is stringent is blessed.²The opposite principle is mentioned in Chullin 54a.10, see Mishneh Torah, Shechitah 10.12