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Metabolite health index relationship with metabolism and milk yield and its composition of postpartum dairy cows.

R. Almeida



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Metabolite health index relationship with metabolism and milk yield and its composition of postpartum dairy cows.
E. J. Askel1, M. Poczynek1, A. M. Fillus1, I. F. Carrari1, J. H. Carneiro1, J. C. S. Louren�o1, G. F. M. Le�o2, R. Almeida*1. 1Universidade Federal do Paran� Curitiba, PR, Brazil, 2Castrolanda Cooperativa Agroindustrial Castro, PR, Brazil.

The goal of this study was to use the metabolite health index (MHI) categorization to evaluated metabolism and productive performance of Holstein postpartum cows. Four hundred 21 cows were evaluated, 173 primiparous and 248 multiparous, from 26 herds in Paran� State, Southern Brazil. Each cow had a single blood sample collected between 0 to 21 DIM. Serum AST, GGT, BHB, NEFA, Ca, glucose, albumin, bilirubin, and cholesterol were evaluated. A MHI was calculated using albumin, bilirubin and cholesterol concentrations, as well as their general means and SD (Gallagher et al., 2019) within 3 classes of lactation week; between 0 to 7 DIM, 8 to 14 DIM, and 15 to 21 DIM. All cows were categorized as medium (mean MHI � 0.5 SD; n = 185 cows; MHI = 0.152), low (<mean MHI — 0.5 SD; n = 108 cows, MHI = −2.832) and high (>mean MHI + 0.5 SD; n = 128 cows; MHI = 2.17) groups, and each cow was categorized within its DIM range. Milk yield (kg), and fat and protein contents in the first test-day were recorded. Fat:protein ratio (FPR) was calculated and accumulated milk up to 30 and 100 DIM (kg) were recorded. Statistical analysis was conducted with GLM procedure from SAS. Cows in the low MHI group had higher BHB (1.00 vs. 0.64 mmol/L; P < 0.01), AST (104.3 vs. 84.3 U/L; P < 0.01), and NEFA (0.83 vs. 0.47 mmol/L; P < 0.01), and lower glucose (58.0 vs. 61.2 mg/dL; P < 0.01), and Ca (8.9 vs. 10.1 mg/dL; P < 0.01) than the high MHI group. It was observed higher (P < 0.01) milk yields at the first test-day for medium and high MHI groups than for low MHI group (39.1 and 37.9 vs. 35.2 kg/d, respectively). But there were no differences (P > 0.05) in accumulated milk up to 30 and 100 DIM, and milk fat content among MHI classes. It was observed lower (P < 0.01) milk protein content for low MHI group than for medium and high classes (3.10 vs. 3.21 and 3.26%), so these last 2 groups had lower FPR (1.18 and 1.19 vs. 1.26) than the high MHI. Our results suggest that there is an effect of the MHI class on milk yield in the first test-day, and there are effects on some blood metabolites which are not included in the MHI calculation.

Keywords: liver health, transition period.