References on beef legislation and the rate of conception in animals?

1. "Beef Cattle Legislation and Regulation" by National Cattlemen's Beef Association. Available at: https://www.ncba.org/beef-legislation-regulation

2. "Legislation and Regulation Affecting the Beef Industry" by American Farm Bureau Federation. Available at: https://www.fb.org/issues/regulatory-reform/legislation-and-regulation-affecting-the-beef-industry

3. "Factors Affecting Conception Rate in Beef Cattle" by University of Missouri Extension. Available at: https://extension2.missouri.edu/g2090

4. "Factors Affecting Conception Rate in Dairy Cattle" by University of Wisconsin-Madison Extension. Available at: https://fyi.extension.wisc.edu/dairynutrition/factors-affecting-conception-rate-in-dairy-cattle/