PERCENTAGE OF CONCEPTION IN COWS (Bos indicus) USING ESTRUS SYNCHRONIZATION AND FIXED TIME ARTIFICIAL INSEMINATION (FTAI)

Abstract

The percentage of conception in cows (Bos indicus) of the Sardo Negro breed subjected to a protocol of estrus synchronization and fixed time artificial insemination (FTAI) in Chinameca Veracruz, México, was evaluated. One hundred and fifty eight (158) multiparous cows were used and selected in two groups, one with cows with calf, and another with cows without calf, treated with a protocol of intravaginal device (IVD) with 1.0 g of progesterone, and in addition injected with 2 mg of estradiol benzoate (sincrodiol); at the moment of IVD withdrawal, 2 ml of prostaglandin f2a (sincroplex) and 400 I.U. of eCG (novormon) were injected; the next day they received in addition1 mg of estradiol benzoate (sincrodiol). The FTAI was carried out 54-56 hours after having withdrawn the IVD device. The percentage of total conception was
45% (71/158). Group one obtained 41% (31/95), while group two 51% (32/53); the statistical analysis showed that there is no significance between the groups. These results allow concluding that heat synchronization using IVD (P4) with FTAI are reproductive technological tools that allow achieving acceptable percentages of conception in cows of the Sardo Negro breed, even in presence of the calf.