Whole-body nitrogen utilization and tissue protein and casein synthesis in lactating primiparous sows fed low- and high-protein diets

Journal of Animal Science
L HuberC F M de Lange

Abstract

Twenty-eight lactating Yorkshire and Yorkshire × Landrace primiparous sows were used to test the hypothesis that feeding a diet with reduced CP concentration and supplemented with crystalline AA (CAA) does not decrease milk protein yield and litter growth but improves apparent N utilization for milk protein production. Sows were assigned to 1 of 2 dietary treatments: 1) control (CON; 16.2% CP; analyzed content) or 2) low CP with CAA to meet estimated requirements of limiting AA (LCP; 12.7% CP) over a 17-d lactation period. A N balance was conducted for each sow between days 13 and 17 of lactation. On day 17, a 12-h primed continuous infusion of l-[ring-2H5]-Phe was conducted on 12 sows (n = 6) with serial blood and milk sampling to determine plasma AA concentrations and Phe enrichment, and milk casein synthesis, respectively. Thereafter, sows were sacrificed and tissues were collected to determine tissue protein fractional synthesis rates (FSR). Litter growth rate and milk composition did not differ. Sows fed the LCP diet had reduced N intake (122.7 vs. 153.2 g/d; P < 0.001) and maternal N retention (13.5 vs. 24.6 g/d; P < 0.05) and greater apparent efficiency of using dietary N intake for milk production (85.1% vs. 67.5%; P < ...Continue Reading

References

Nov 1, 1991·The British Journal of Nutrition·V E BaracosM Marie
Feb 1, 1990·Journal of Animal Science·J NobletM Etienne
May 1, 1980·The British Journal of Nutrition·G E LobleyK Pennie
Jun 4, 2002·The Journal of Nutrition·Xinfu GuanNathalie L Trottier
May 1, 2009·The Journal of Nutrition·Mark D HaniganBrian J Bequette
Jul 21, 2012·Journal of Applied Physiology·Nicholas A BurdLuc J C van Loon
Dec 8, 2015·Journal of Animal Science·L HuberN L Trottier
Oct 4, 2016·Journal of Animal Science·E G MillerC F M de Lange

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Citations

Jun 30, 2019·Journal of Animal Science·Trine F PedersenPeter K Theil
Jun 15, 2019·Animal : an International Journal of Animal Bioscience·M D TokachR D Goodband
Jan 31, 2021·Animal : an International Journal of Animal Bioscience·U KroghJ van Milgen

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