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Evaluation of early embrionic development after natural mating using ultrasonography in bos indicus cows in the humid tropics of Costa Rica
(Springer, 2008)
Fifty-eight nursing Zebu cows averaging 5922 days postpartum were used to
evaluate the early embryonic development by ultrasound under a natural mating system
(bulls A to F). Three consecutive mating periods of 21 days ...