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7275223 
Journal Article 
Chromium supplementation improves glucose metabolism and vaginal temperature regulation in Girolando cows under heat stress conditions in a climatic chamber 
Ribeiro Lilian Dos, S; Brandão Felipe, Z; Carvalheira Luciano De, R; Goes Túlio José De, F; Torres Filho Rodolpho De, A; Quintão Carolina Capobiango, R; Pires Maria De Fátima, Á; Camargo Luiz Sérgio De, A; De Carvalho Bruno, C 
2020 
1 
Tropical Animal Health and Production
ISSN: 0049-4747 
52 
4 
1661-1668 
English 
31853788 
WOS:000542689000016 
This study aimed to evaluate chromium supplementation on productive, reproductive, and metabolic parameters at lactating Girolando cows subjected to heat stress conditions in a climatic chamber. Thirty-six lactating Girolando cows were subjected to two sequential trials. In trial 1 (thermoneutral environment), the effect of chromium supplementation was evaluated (0 vs. 0.50 mg/kg of dry matter). In trial 2, the cows were fed the same diets, but they were divided into three environmental conditions: heat stress conditions in climatic chamber, fed ad libitum (HS); thermoneutral environment, fed ad libitum (TN); and thermoneutral environment, pair-fed (PF). In thermoneutral conditions, chromium supplementation did not affect productive or metabolic parameters, although supplemented cows had lower viability of oocytes (65.11 ± 0.08% vs. 76.86 ± 0.08%). During heat stress, chromium supplementation lowered plasma glucose levels (61.17 ± 1.90 vs. 67.11 ± 1.90 mg/dL), and increased the insulin:glucose ratio (0.39 ± 0.04 vs. 0.27 ± 0.04). Cows fed the control diet in the HS group had higher vaginal temperature values (39.40 ± 0.10 °C) than the cows in the TN group and PF group (38.89 ± 0.10 °C and 38.85 ± 0.11 °C, respectively). However, supplemented cows heat-stressed maintained the same vaginal temperature as cows in thermoneutral conditions. In conclusion, chromium supplementation improved glucose metabolism and prevented body temperature increases under heat stress conditions. 
Agriculture--Poultry And Livestock; Dairy cattle; Milk composition; Reproduction; Metabolism; Insulin; Glucose; Dietary supplements; Glucose metabolism; Body temperature; Environmental effects; Test chambers; Heat stress; Gametocytes; Environmental conditions; Supplementation; Dry matter; Chromium; Heat tolerance; Oocytes; Parameters