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Impact of supplementary trace mineral source on health and reproduction in lactating dairy cows.

B. Mion




Impact of supplementary trace mineral source on health and reproduction in lactating dairy cows.
B. Mion*1, J. F. W. Spricigo1, K. King1, L. Ogilvie1, O. Chiu1, L. Lobe1, B. Van Winters1, E. Merry1, S. LeBlanc2, M. A. Steele1, B. W. McBride1, E. S. Ribeiro1. 1Department of Animal Biosciences, University of Guelph Guelph, ON, Canada, 2Department 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 the incidence of clinical disease and the intervals from calving to resumption of estrous cyclicity and to first AI. Heifers and cows (n = 240) were enrolled at 45 � 3 d before expected calving date, blocked by parity and BCS, and allocated randomly to ITM or OTM supplementation. Automatic feeding gates were used to assign treatments to individual cows through 150 DIM. After calving, diagnoses of clinical diseases were performed by the research team and farm personnel. Starting on d 21 � 3, ovarian structures were examined weekly by ultrasonography to determine the first appearance of a corpus luteum. Cows received injections of PGF2? on d 42 � 3 and 56 � 3, and estrus behavior was evaluated using activity monitors. Continuous data were analyzed by ANOVA and binary data were analyzed by logistic regression using the GLIMMIX procedure of SAS. Statistical models included the effects of treatment, parity, season, and their interactions. P values < 0.05 were considered statistical difference and P values < 0.1 were considered tendency. Analyses of data from 209 cows indicated that fewer cows in OTM group tended to have postpartum diseases than cows in ITM (ITM = 26.5 vs. OTM = 14.6%; P = 0.07). Cows in OTM group resumed postpartum estrous cyclicity earlier than cows in the ITM group (ITM = 5.3 � 0.2 vs. OTM = 4.7 � 0.2 wk; P = 0.04). OTM had a greater proportion of estrous cyclic cows than ITM in wk 4 (ITM = 39.2 vs. OTM 55.7%, P = 0.03) and 5 (ITM = 56.4 vs. OTM = 75.0%, P = 0.01), but not wk 6 (INO = 78.1 vs. OTM = 88.2%, P = 0.09) and later. No differences between treatments were observed in proportion of cows detected in estrus after the second PGF (ITM = 65.2 vs. OTM = 64.6%, P = 0.94) or the interval from calving to first AI (ITM = 63.2 � 0.9 vs. OTM = 64.4 � 0.9 d; P = 0.32). Our results indicate that replacement of ITM by OTM in pre- and postpartum diets improved postpartum health and hastened resumption of estrous cyclicity.

Keywords: trace minerals, health, reproduction.

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.