Resumo

MULLER, M. et al. Flushing on the postpartum beef cows submitted to early weaning: reproductive performance. Arch. zootec. [online]. 2010, vol.59, n.225, pp.131-139. ISSN 1885-4494.

The objective of this experiment was to evaluate the effects of short-time fat supplementation (flushing) on the reproductive performance (postpartum estrus, postpartum anestrus, postpartum estrus interval, calving interval, number of artificial insemination, artificial insemination interval, and pregnancy rate) of postpartum beef cows, submitted to the early weaning. Two hundred and fifty eight beef cows were used from the following genetic groups: Aberdeen Angus (n= 21), Aberdeen Angus x Canchim (n= 20), Canchim x Aberdeen Angus (n= 52), Charoles x Caracu (n= 29), Charolais (n= 18), Cachim (n= 34), Caracu (n= 35), Caracu x Charoles (n= 26) an Purunã (n= 23), with 418.1 kg of body weight and all pregnant. These animals were split into two types of treatments: flushing (30% soybean full + 70% corn) and no supplementation. There was no flushing effect on postpartum estrus percentage (82.9%), anestrus percentage (17.0%), postpartum estrus interval (100.5 days), calf birth weight (34.2 kg), number of artificial insemination (1.4), interval between the 1^st and the 2^nd artificial insemination (19.2 days), interval between the 1^st and the 2^nd artificial insemination (19.9 days), and pregnancy percentage (54.6%). The flushing reduced calving interval (391.14 vs. 399.31 days). The November period had lower postpartum estrus percentage (70.6%), anestrus percentage (29.4%), postpartum estrus interval (90.3 days), calving interval (378.3 days), number of artificial insemination (1.2), interval between the 1^st and the 2^nd artificial insemination (11.5 days), and pregnancy percentage (27.5%).

Palavras-chave : Anestrus; Calving interval; Estrus; Lipids.

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