Inseminations were preassigned
in this order to account for different numbers of straws available from each sperm
sorting treatment so that an approximately equal distribution of estrus-AI and timed AI
inseminations occurred with each bull and sperm treatment (n = 240, 228, 170 and 160 for 20M
CON, 10M CON, 10M PNA, and 10M UBI, respectively).