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Consistency of lying time is associated with reduced serum non-esterified fatty acids of prepartum dairy heifers and cows.

B. T. Menichetti

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06-22-2020

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Abstract:

M31
Consistency of lying time is associated with reduced serum non-esterified fatty acids of prepartum dairy heifers and cows.
B. T. Menichetti*1, J. M. Pi�eiro2, A. Garcia-Guerra3, A. E. Relling4, W. P. Weiss4, G. M. Schuenemann1. 1Department of Veterinary Preventive Medicine, The Ohio State University Columbus, OH, 2Department of Animal Science, Texas A&M AgriLife Extension Service Amarillo, TX, 3Department of Animal Sciences, The Ohio State University Columbus, OH, 4Department of Animal Sciences, The Ohio State University Wooster, OH.

The objective was to assess the association of pre-partum lying time (LT) with serum nonesterified fatty acids (NEFA) in prepartum dairy heifers and cows. A total of 723 Holstein pregnant dairy heifers (n = 229) and multiparous cows (n = 494) from 3 dairy herds were enrolled at 14 � 3 d before parturition (dpp). A cohort of 20 to 36 cows was enrolled monthly at each dairy herd and electronic data loggers (IceQube, IceRobotics, Edinburgh, UK) were fitted to the hind leg of individual heifers and cows to assess their LT. To assess consistency of LT, the coefficient of variation (CV) of LT was computed for each individual animal by dividing the SD by mean LT within 7 d before blood NEFA collection and reported as an absolute ratio. Blood samples were collected from animals at 7 � 3 dpp for serum NEFA concentration. Herd 1 regrouped animals 3 times per week while herds 2 and 3 regrouped animals once per week. PROC CORR procedure of SAS was used to assess the relationship between CV of LT and prepartum serum NEFA. Correlations were adjusted by parity, body condition score (BCS) at enrollment, season (winter, spring, summer and fall), and herd. Season, herd, parity, and BCS were associated with CV of LT (P < 0.05). Pregnant heifers had an overall mild (r = 0.28, P < 0.0001; herd 1: r = 0.13, herd 2: r = 0.52, and herd 3: r = 0.19) significant positive correlation between mean CV of LT and serum NEFA. Multiparous cows had an overall weak (r = 0.11, P = 0.01; herd 1: r = 0.07, herd 2: r = 0.13, and herd 3: r = 0.14) significant positive correlation between mean CV of LT and serum NEFA. The greater the CV of LT (<0.10 vs >0.30) within 7 d before blood collection, the greater the concentration of serum NEFA (302 �Eq/L vs 450 �Eq/L; P = 0.005). These findings provide evidence that consistency of LT of prepartum heifers and cows should be considered when troubleshooting metabolic problems at the herd level.

Keywords: prepartum, lying time, NEFA.