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http://dx.doi.org/10.5713/ab.22.0068

Prepartum and/or postpartum supplementation with monensin-molasses multinutrient blocks to optimize fertility and calf performance in primiparous beef cows  

Catussi, Bruna Lima Chechin (Department of Animal Reproduction, Faculty of Veterinary Medicine and Animal Science, University of Sao Paulo)
da Silva, Laisa Garcia (Department of Animal Reproduction, Faculty of Veterinary Medicine and Animal Science, University of Sao Paulo)
Schalch, Fernando Jose Junior (Minerthal Nutritional Products)
Auder, Rafaela Maria Sutiro Angelieri (Mater farm)
Gomez, Juan Fernando Morales (Department of Animal Science, Faculty of Animal Science and Food Engineering, University of Sao Paulo)
Mingoti, Rodolfo Daniel (Department of Animal Reproduction, Faculty of Veterinary Medicine and Animal Science, University of Sao Paulo)
Morgulis, Sergio Carlos Franco (Minerthal Nutritional Products)
Baruselli, Pietro Sampaio (Department of Animal Reproduction, Faculty of Veterinary Medicine and Animal Science, University of Sao Paulo)
Publication Information
Animal Bioscience / v.35, no.11, 2022 , pp. 1675-1688 More about this Journal
Abstract
Objective: Pregnant Nelore heifers (n = 417) were used to evaluate the effects of supplementation with monensin-molasses multinutrient block (B) during pre and/or postpartum on reproductive and progeny performance. Methods: Heifers were allocated in four treatments: i) CC: heifers received control supplement (C) in loose meal form (0.06% of body weight [BW] offered daily before and after parturition; n = 108); ii) CB: received C before parturition and B (0.07% of BW offered weekly after parturition; n = 117); iii) BC: received B before and C after parturition (n = 103) and iv) BB: received B before and after parturition (n = 89). During pre and postpartum periods, concentration of metabolites/hormones and cow/calf performance was evaluated over time. Cows were synchronized twice for fixed timed artificial insemination (FTAI) using an estradiol/progesterone-based protocol. Data was analyzed by orthogonal contrasts (C). Results: B increased pregnancy at first FTAI (p = 0.04) and overall pregnancy rate (C1: CC vs BB+BC+CB; p = 0.05). Supplemented cows had greater body condition score (BCS) only at parturition (D0; p = 0.04) and at D40 (p = 0.02). B increased BW (p = 0.03), glucose concentrations (p = 0.01) and subcutaneous fat thickness (p = 0.03) only at D40. Concentrations of insulin were higher in supplemented cows (p = 0.008). Calves born by cows supplemented before and after parturition (C2: BB vs BC+CB) were heavier at 80 (p<0.001), 120 (p<0.001), 170 (p = 0.002) and 210 (p = 0.02) days old. Conclusion: Regardless of period of treatment, block supplementation increased pregnancy at first FTAI and overall pregnancy rate. Additionality, block supplementation during both pre and postpartum periods improved progeny weight until weaning. Block supplementation can be a tool to optimize fertility and calf performance in Nelore primiparous cows.
Keywords
Beef Cattle; Calves; Fixed Timed Artificial Insemination (FTAI); Nutrition; Pregnancy; Reproduction;
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