Aarhus University Seal / Aarhus Universitets segl

Peter Kappel Theil

Nitrogen utilization of lactating sows fed increasing dietary protein

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

DOI

  • Trine F. Pedersen
  • ,
  • Thomas S. Bruun, SEGES Danish Pig Res Ctr
  • ,
  • Nathalie L. Trottier, Michigan State University
  • ,
  • Peter K. Theil

The objectives of the study were 1) to quantify dietary N utilized for milk N and N loss in urine and feces, in sows fed increasing dietary CP with a constant amount of Lys, Met, Thr, and Trp to meet their standardized ileal digestible (SID) requirement and 2) to determine the optimal dietary CP concentration based on dietary N utilization for milk production. Seventy-two sows were fed 1 of 6 dietary treatments, formulated to increase the SID CP as followed: 11.8, 12.8, 13.4, 14.0, 14.7, and 15.6% and formulated to be isocaloric (9.8 MJ NE/kg). Diets were fed from day 2 after parturition until weaning at day 28 (+/- 3 d). Litters were equalized to 14 piglets and weighed within 48 h following parturition. Sows were weighed and back fat scanned, at day 18 (+/- 3 d) and day 28 (weaning; +/- 3 d). Litter weight was recorded at day 11, 18 (+/- 3 d), and 28 (+/- 3 d). Nitrogen balances were conducted on approximately day 4, 11, and 18 (+/- 3 d). Daily milk yield was estimated from recorded litter gain and litter size. To calculate sows mobilization of fat and protein, body pools of fat and protein were estimated by D2O (deuterated water) enrichment on day 4 and 18 (+/- 3 d). No linear, quadratic, or cubic effects of increasing dietary CP was observed for sows total feed intake, sow BW, body pools of protein and fat, protein and fat mobilization, total milk yield, and piglet performance. The protein content in milk increased linearly with increasing dietary CP in week 1 (P <0.05), week 2 (P <0.05), and week 3 (P <0.001). Urine production did not differ among treatments and N output in urine increased linearly with increasing dietary CP concentration in week 1 (P = 0.05), week 2 (P <0.001), and week 3 (P <0.001). Urine N excretion relative to N intake increased linearly with increasing dietary CP (P <0.001). Milk N utilization relative to N intake decreased linearly from 77.8% to 63.1% from treatment 1 through 6 (P <0.001). Corrected milk N utilization decreased from 68.6% to 64.2% from treatment 1 through 6 (P <0.05). In conclusion, a low dietary CP concentration for lactating sows with supplemented crystalline AA improved the efficiency of dietary N utilization and reduced the N output in urine without affecting lactation performance.

Original languageEnglish
JournalJournal of Animal Science
Volume97
Issue8
Pages (from-to)3472-3486
Number of pages15
ISSN0021-8812
DOIs
Publication statusPublished - Aug 2019

    Research areas

  • body mobilization, feed efficiency, lactation, nitrogen metabolism, sow nutrition, TO-LYSINE RATIO, BODY-COMPOSITION, PRIMIPAROUS SOWS, MILK-PRODUCTION, ENERGY-BALANCE, CRUDE PROTEIN, AMINO-ACIDS, PERFORMANCE, METABOLISM, GROWTH

See relations at Aarhus University Citationformats

ID: 161331939