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- W4245230048 abstract "Abstract Background: Supplementation programs for prepartum beef cows are usually adopted because the nutritional status of the cows upon calving is a main factor impacting reproductive performance of the next production cycle. Metabolic parameters that relate nutritional status to physiological processes can be used to better understand the effects of supplementation. This study evaluated the effects of 60-d pre-partum energy-protein supplementation on performance, metabolic and hormonal responses during the peripartum phase of grazing beef cows. Thirty-eight pregnant multiparous Nellore cows were assigned to a completely randomized design with two treatments: control (no supplement) and supplementation (1.5 kg of energy-protein per d) during the last 60 d of gestation. Results: The supplemented cows had higher ADG pre-partum (P<0.10), but postpartum ADG did not differ between treatments. Nonsupplemented cows’ ADG did not change during these periods (P>0.10). Supplementation did not affect BCS and calf BW upon calving on days 45 and 90, milk yield and composition (P>0.10). No differences were found for forage intake and neutral detergent fiber digestibility (P>0.10). The intake and digestibility of CP and OM increased with supplementation (P<0.10). An interaction occurred (P>0.10) between supplementation and peripartum days for BUN, βHB, T3 and T4. Concentration of others blood parameters significantly changed (P<0.10) along peripartum days. There was no difference in pregnancy rates and days from calving to conception among treatments (P>0.10). Conclusions: Providing an energy and protein supplement to grazing Nellore cows over the last 60 d of gestation improved their pre-partum energy balance. However, no post-partum carryover effects were detected. Keywords: nutrition, metabolism, parturition, Zebu" @default.
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- W4245230048 date "2020-01-24" @default.
- W4245230048 modified "2023-09-26" @default.
- W4245230048 title "Performance, metabolic and hormonal responses of grazing Nellore cows to an energy-protein supplementation during the pre-partum phase" @default.
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- W4245230048 doi "https://doi.org/10.21203/rs.2.17836/v2" @default.
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