Related to the last post, I tried different search terms with the Canadian Patents Database (http://brevets-patents.ic.gc.ca/opic-cipo/cpd/eng/introduction.html).

One of the results for the search term “PZP” was:

http://brevets-patents.ic.gc.ca/opic-cipo/cpd/eng/patent/2378478/summary.html

(12) Patent Application: (11) CA 2378478
(54) English Title: FERTILITY IMPAIRING VACCINE CONTAINING AVIAN ZONA PELLUCIDA PROTEIN AND METHOD OF USE
. . .

English Abstract

A vaccine comprising an immunogen derived from an avian zona pellucida protein is useful for immunocontraception and immunosterilization of animals.
. . .

HT

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