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Abstract
Forty-five non-lactating, pregnant Holstein animals (18 heifers and 27 multiparous cows; BW = 561±114 kg; BCS = 2.9±0.3; days pregnant = 110±56 d) were stratified by initial BW and BCS, and randomly assigned to receive daily (as-fed basis) 0.50 kg of ground corn plus 0.22 kg of kaolin (CON), calcium salts of saturated fatty acids (SFA) or polyunsaturated fatty acids (PF) for 14 d. Blood samples were collected on days 0, 7 and 14, immediately prior to (0 h) and 3, 6, 9 and 12 h after feeding, to determine the serum concentrations of P4 and insulin. No treatment effects were detected for serum concentrations of P4 (5.52, 6.13 and 5.63±0.41 ng/mL for CON, SFA and PF, respectively). No treatment effects were detected for serum concentrations of insulin (11.5, 10.5 and 10.1±1.43 µIU/mL for CON, SFA and PF, respectively). Heifers had greater serum concentrations of P4 than multiparous cows (6.35 vs. 5.16±0.42 ng/mL), but lower serum concentrations of insulin (7.0 vs. 14.4±1.49 µIU/mL). Feeding 0.22 kg of calcium salts of polyunsaturated fatty acids is not sufficient to increase the serum concentrations of P4 and insulin of non-lactating, pregnant dairy cows.
Highlights
Polyunsaturated fatty acids (PUFA), such as linoleic (LA) and linolenic (LNA) acids have been associated with enhanced reproduction of dairy and beef cows (Staples et al, 1998; Lopes et al, 2009, 2011)
It is not known if relatively small amounts of polyunsaturated fatty acids (PUFA) may increase the circulating concentrations of P4 by increasing the synthesis of P4 and/or decreasing the hepatic metabolism of P4
Serum concentrations of insulin peaked at 3 h (12.51 μIU/mL; SEM = 0.93), but decreased 12 h after supplements were offered (7.69 μIU/mL; SEM = 0.98)
Summary
Polyunsaturated fatty acids (PUFA), such as linoleic (LA) and linolenic (LNA) acids have been associated with enhanced reproduction of dairy and beef cows (Staples et al, 1998; Lopes et al, 2009, 2011). Limited information exists regarding the effects of relatively small amounts of PUFA supplementation on circulating concentrations of P4 in dairy cows (Reis et al, 2012). Polyunsaturated fatty acids may be partitioned into different locations (e.g. body tissue, milk, and embryo), depending on the priority of the metabolism (Hess et al, 2008). It is not known if relatively small amounts of PUFA may increase the circulating concentrations of P4 by increasing the synthesis of P4 and/or decreasing the hepatic metabolism of P4
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