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Effect of feeding rumen-protected methionine pre- and postpartum on health, herd exit dynamics, and time to pregnancy in multiparous dairy cows.

M. Z. Toledo

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06-24-2020

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Abstract:

W106
Effect of feeding rumen-protected methionine pre- and postpartum on health, herd exit dynamics, and time to pregnancy in multiparous dairy cows.
M. Z. Toledo*1, M. L. Stangaferro2, R. S. Gennari1, P. L. J. Monteiro Jr.1, M. M. Perez2, M. Masello2, M. E. Van Amburgh2, D. Luchini3, R. D. Shaver1, J. O. Giordano2, M. C. Wiltbank1. 1University of Wisconsin-Madison Madison, WI, 2Cornell University Ithaca, NY, 3Adisseo Alpharetta, GA.

Objectives were to evaluate the effect of feeding rumen-protected methionine (RPM) from 3 wk prepartum up to 147 d postpartum on clinical health disorders, uterine health, herd exit dynamics and time to pregnancy in multiparous dairy cows. A total of 470 multiparous Holstein cows [235 cows at University of Wisconsin (UW) and 235 cows at Cornell University (CU)] were enrolled prepartum, fed a basal diet, and randomly assigned treatments: Fed RPM (Smartamine M; MET), UW:2.83% and 2.58%, CU: 2.85% and 2.65% of Met as % of metabolizable protein (MP) and control (CON) = UW:2.30% and 2.09%, CU:2.22% and 2.19% of Met as % of MP, respectively pre- and postpartum. Cows were monitored for health disorders during the feeding experimental period and herd exit dynamics and time to pregnancy were evaluated up to 300 DIM. Cytological endometritis was evaluated at 35 � 3 DIM. Cows received first AI after Double-Ovsynch at 80 � 3 DIM followed by systematic reproductive management. Pregnancy diagnosis was performed by transrectal ultrasound (32 d after AI). Health data were analyzed by logistic regression and pen was the experimental unit. Cox's proportional hazards regression was used for the analysis of time to event. Treatments had no effect on proportion of cows with displaced abomasum, ketosis, mastitis, retained placenta, respiratory problems or lameness (P > 0.10). However, cows fed MET tended (P = 0.08) to be less likely to be sold (16.9% vs 10.7%) and had lower risk of being sold up to 300 DIM than CON (hazard ratio [HR] = 1.59, CI = 0.97 to 2.62, P = 0.07). No effects were observed on first service Pregnancy/AI or pregnancy loss (P > 0.10). Overall, cows fed MET tended to have reduced time to pregnancy (HR = 1.14, CI = 0.93 to 1.39, P = 0.10). Moreover, within cows with multiple health disorders (n = 116), cows fed MET had shorter time to pregnancy than CON (HR = 1.46, CI = 0.97 to 2.20, P = 0.04). In conclusion, feeding MET to multiparous cows pre- and postpartum may reduce time to pregnancy, particularly in cows with multiple health disorders, and appears to decrease likelihood of cows being sold.

Keywords: methionine health pregnancy.