. 1997. Supplementation with chromium picolinate reduces the incidence of placental retention in dairy cows. Can. J. Anim. Sci. 77: 329-330. A test with two groups (n for each group = 25) of Holstein cows was conducted to evaluate the effects of chromium picolinate (CrPic) on the incidence of placenta retention (PR). Organic chromium supplementation, equivalent to 3.5 mg Cr d -1 per cow, administered during the last 9 wk of pregnancy, decreased nearly four times the incidence of placental retention observed in unsupplemented cows (16% vs. 56%, P < 0.05, chi square test). Calf body weight (BW) at birth was similar in both groups (without Cr = 43.92 ± 0.75 kg vs. Cr supplementation = 44.26 ± 0.84 kg).Key words: Placental retention, chromium picolinate, stress, dairy cows Villalobos-F., J. A., Romero-R., C., Tarragó-C., M. R. et Rosado, A. 1997. La supplémentation en chrome organique redui l'incidence de rétention placentaire des vaches laitière. Can. J. Anim. Sci. 77: 329-330. Nous avons fait un expérience avec deux groupes des vaches laitières (n pour chaque grupue = 25) pour analyser l'effect du chrome organique sur l'incidence de rétention placentaire. Le groupe avec supplémentation en picolinate du chrome (3.5 mg vache j -1 ) depuis 9 semaines avant le vêlage a presanté 16% de rétention placentaire, tandis que, le groupe sans chrome a presanté 56% de rétention placentaire. Le poid corporelle c'est similaire dans les deux groups (supplémentation en chrome = 44.26 ± 0.84 vs sans chrome = 43.92 ± 0.75 kg).
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