01987naa a2200253 a 450000100080000000500110000800800410001902200140006010000210007424501940009526000090028952011440029865000280144265000210147065300260149170000200151770000230153770000230156070000150158370000260159870000190162470000160164377300740165921486282022-11-23       2022    bl uuuu     u00u1 u    #d  a2525-34091 aSALMAN, A. K. D.  aHas the soybean oil supplementation effect on milk production, feed efficiency, and grazing behavior of Girolando cows under moderate heat stress in western Amazonia?h[electronic resource]  c2022  aThe effect of soybean oil supplementation in the diet of early lactating Girolando cows under moderate heat stress were studied in a grazing trial. Dry matter intake (DMI), milk yield, feed efficiency, and grazing behavior (during daytime and nighttime) were evaluated in two groups of eight crossbred Girolando (Holstein × Gyr) cows grazing palisade grass (Urochloa brizantha syn. Brachiaria brizantha) with initial means of 53±33 days in lactation and 22.6±3 kg of milk day-1. They were arranged in a 2×2 crossover trial with two supplements (with or without soybean oil), two genetic groups and two periods. During the experimental period, the mean of temperature and humidity index (THI) was 75.11, suggesting moderate heat stress. Total DMI was based on fecal production estimated by LIPE® and the diet in vitro DM digestibility (IVDMD). Grazing behavior was assessed for 48 hours by acoustic data collected with MP3 recorders. Soybean oil supplementation had no significant effects on all variables evaluated in this study. Averages of individual milk yield and total DMI were 19.26 kg day-1 and 15.32 kg DM day-1, respectively.  aConsumption (economics)  aFeeding behavior  aLipid supplementation1 aSOUZA, E. C. de1 aCARVALHO, G. A. de1 aSILVA, F. R. F. da1 aHALFEN, J.1 aSANTIAGO, E. A. A. de1 aCRUZ, P. G. da1 aSCHMITT, E.  tResearch, Society and Developmentgv. 11, n. 14, e289111435663, 2022.