Plasma amino acid uptake by the mammary gland of the lactating sow

Journal of Animal Science
N L TrottierR A Easter

Abstract

The objectives of this study were to measure arteriovenous concentration (A-V) differences and estimate uptake of amino acids across the mammary gland in lactating sows. Four sows were used in Trial 1 and nine sows in Trial 2. Cannulas were fitted in the right anterior mammary vein and the carotid artery around d 7 of lactation. Arteriovenous samples were obtained on d 11, 14, 17, and 20. Litters were separated from the sows for 90 min, after which the first blood samples were drawn. Samples were taken at 20-min intervals for the next two consecutive hours. Milk production measurements and milk samples were obtained between d 11 and 19. Liters of plasma to liters of milk ratio (conversion coefficient) was estimated with the Fick method using A-V difference for lysine and milk lysine concentration. The conversion coefficient and the daily plasma flow were 541.41 +/- 35.72 L of plasma per liter of milk and 4,275 +/- 386 L of plasma, respectively. The A-V differences and the plasma flow were used to quantify daily amino acid uptake by the mammary gland. Uptake estimates (grams/day) were 36.51 +/- 4.05 (leucine), 31.24 +/- 3.64 (arginine), 23.39 +/- 2.97 (lysine), 21.22 +/- 1.96 (valine), 18.36 +/- 1.92 (isoleucine), 15.9 +/- 1.9 (...Continue Reading

Citations

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