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Impact of supplementary trace mineral source on production, feed intake and efficiency, metabolism, and rumen parameters in dairy cows.

B. Mion




Impact of supplementary trace mineral source on production, feed intake and efficiency, metabolism, and rumen parameters in dairy cows.
B. Mion*1, J. F. W. Spricigo1, E. Cran1, L. Ogilvie1, K. King1, S. Anan1, D. Stratas1, B. Smith1, Y. Chen2, L. L. Guan2, T. J. DeVries1, S. J. LeBlanc3, M. A. Steele1, B. W. McBride1, E. S. Ribeiro1. 1Department of Animal Biosciences, University of Guelph Guelph. ON, Canada, 2Department of Agricultural, Food and Nutritional Science, University of Alberta Edmonton, AB, Canada, 3Department of Population Medicine, University of Guelph Guelph, ON, Canada.

Our objectives were to evaluate the impact of supplementary trace minerals source, inorganic (ITM; Co, Cu, Mn, Zn sulfates and sodium selenite) or organic (OTM; Co, Cu, Mn, Zn proteinates and Se yeast; Bioplex Sel-Plex, Alltech Inc.), fed at 100% of recommended levels, on milk production, dry matter intake (DMI), gross feed efficiency, blood metabolites, rumen fluid pH and volatile fatty acid (VFA) concentration, and rumination activity. Heifers and cows (n = 240) were enrolled at 45 � 3d before expected calving date, blocked by parity and BCS, and allocated randomly to ITM or OTM treatments. Cows in both groups were fed the same diet, except for the source of supplemental TM, using automatic feeding gates to assign treatments to individual cows, which were fed until 150 DIM. Blood was collected on d −4, 0, 3, 7, 10, 14, 23, and 65 relative to calving. Cows were fitted with a neck-based collar to measure rumination activity, and ruminal fluid was collected on d −21, 23 and 65 � 3 relative to calving. Data were analyzed by ANOVA using PROC GLIMMIX of SAS. Statistical models included the effects of treatment, parity, season, time, and their interactions. For repeated measures, data were summarized weekly and cow nested within treatment was considered a random term. Analyses of data from 145 cows indicated differences in prepartum DMI (ITM = 12.3 � 0.3 vs. OTM = 13.1 � 0.3 kg/d; P = 0.04). Cows in OTM group had reduced concentration of NEFA (ITM = 0.55 � 0.02 vs. OTM = 0.48 � 0.02 mmol/L; P < 0.01), and greater concentration of albumin (ITM = 35.29 � 0.21 vs. OTM = 35.89 � 0.21 g/L; P = 0.04) in serum compared with cows in ITM group. Cows in OTM tended to have greater concentration of butyric acid (ITM = 9.4 � 0.5 vs. OTM = 10.7 � 0.5 �mol/mL; P = 0.06), valeric acid (ITM = 1.5 � 0.07 vs. OTM = 1.7 � 0.07 �mol/mL; P = 0.06) and total VFA (ITM = 96.5 � 2.7 vs. OTM = 102.7 � 2.7 �mol/mL; P = 0.10) in ruminal fluid on d 23 than cows in ITM. Cows in ITM spent more time ruminating during the prepartum (ITM = 480 � 13 vs. OTM = 442 � 13 min/d; P = 0.04) and postpartum periods (ITM = 468 � 11 vs. OTM = 430 � 11 min/d; P = 0.01. Postpartum DMI, yields of milk, energy-corrected milk, protein, and fat, gross feed efficiency, and ruminal fluid pH did not differ between treatment (P > 0.1). Our results indicate that replacement of inorganic sources of supplementary TM by organic sources affects prepartum feed intake and rumen parameters, and slightly improve the postpartum metabolism of dairy cows.

Keywords: trace minerals, feed intake, milk production.

Biography: My name is Bruna Mion. I graduated from Veterinary Medicine in 2015 at the Universidade Federal de Pelotas. I completed a Master's degree in 2018 at the same institution. My Master's project examined the relationship between ovarian follicular size and the moment of ovulation and the reproductive performance of cows submitted to hormonal protocol for fixed-timed artificial insemination. I am now completing my PhD in Animal Biosciences examining the long-lasting effects of clinical diseases and inflammatory status postpartum on milk production, feed efficiency and reproductive performance of dairy cows.