Resumo

SEVERINO LENDECHY, Víctor Hugo et al. Effect of restricted suckling and food complementation on weight gains and postpartum anoestrous in beef cows. Biotecnia [online]. 2020, vol.22, n.1, pp.109-116.  Epub 03-Ago-2020. ISSN 1665-1456.  https://doi.org/10.18633/biotecnia.v22i1.1158.

The objective of the present study was to evaluate the effect of restricted suckling and nutritional complementation on weight gain and postpartum anestrus, in beef cattle, for which 120 lactating Simbrah cows were used, distributed in four treatments: T1) continuous suckling with food complementation (ACCCA, n=30), T2) restricted suckling without food complementation (ARSCA, n=30), T3) restricted suckling with food complementation (ARCCA, n=30) and T4) continuous suckling without food complementation (ACSCA, n=30). Results were evaluated through analysis of variance in a 2x2 factorial arrangement, Chi-square and simple correlation. Weight gain (g/day) and estrus weight (kg) in T3 cows were higher (0.926 and 551.0) compared to T1 (0.425 and 535.0), T2 (0.544 and 545.8) and T4 (0.194 and 501.0), respectively (P<0.01). Postpartum anestrus (days) was lower in T3 (85.5) compared to T1 (185.6), T2 (158.0) and T4 (259.2) (P<0.01). Pregnancy rate (%) was higher in T3 (86.6, 26/30) with respect to T1 (60.0, 18/30), T2 (70.0, 21/30) and T4 (40.0, 12/30) (P< 0.05). An effect was found on the type of suckling and CA. In conclusion, the ARCCA increases pregnancy rate and decreases postpartum anestrus in Simbrah cows in the tropics.

Palavras-chave : Open days; nutrition; ovulation; restricted suckling.