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Effects of Dietary Protein Levels for Gestating Gilts on Reproductive Performance, Blood Metabolites and Milk Composition

  • Jang, Y.D. ;
  • Jang, S.K. ;
  • Kim, D.H. ;
  • Oh, H.K. ;
  • Kim, Y.Y.
  • Received : 2013.06.28
  • Accepted : 2013.09.12
  • Published : 2014.01.01

Abstract

This experiment was conducted to evaluate the effects of dietary CP levels in gestation under equal lysine content on reproductive performance, blood metabolites and milk composition of gilts. A total of 25 gilts ($F_1$, Yorkshire${\times}$Landrace) were allotted to 4 dietary treatments at breeding in a completely randomized design, and fed 1 of 4 experimental diets containing different CP levels (11%, 13%, 15%, or 17%) at 2.0 kg/d throughout the gestation. Body weight of gilts at 24 h postpartum tended to increase linearly (p = 0.09) as dietary CP level increased. In lactation, backfat thickness, ADFI, litter size and weaning to estrus interval (WEI) did not differ among dietary treatments. There were linear increases in litter and piglet weight at 21 d of lactation (p<0.05) and weight gain of litter (p<0.01) and piglet (p<0.05) throughout the lactation as dietary CP level increased. Plasma urea nitrogen levels of gilts in gestation and at 24 h postpartum were linearly elevated as dietary CP level increased (p<0.05). Free fatty acid (FFA) levels in plasma of gestating gilts increased as dietary CP level increased up to 15%, and then decreased with quadratic effects (15 d, p<0.01; 90 d, p<0.05), and a quadratic trend (70 d, p = 0.06). There were no differences in plasma FFA, glucose levels and milk composition in lactation. These results indicate that increasing dietary CP level under equal lysine content in gestation increases BW of gilts and litter performance but does not affect litter size and milk composition. Feeding over 13% CP diet for gestating gilts could be recommended to improve litter growth.

Keywords

Gilt;Protein;Reproductive Performance;Milk Composition;Litter Growth

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Cited by

  1. Effects of Dietary Energy Levels on the Physiological Parameters and Reproductive Performance of Gestating Gilts vol.29, pp.7, 2016, https://doi.org/10.5713/ajas.16.0269
  2. Effects of dietary energy levels on physiological parameters and reproductive performance of gestating sows over three consecutive parities vol.31, pp.3, 2018, https://doi.org/10.5713/ajas.17.0016
  3. Role of Maternal Dietary Protein and Amino Acids on Fetal Programming, Early Neonatal Development, and Lactation in Swine vol.9, pp.1, 2019, https://doi.org/10.3390/ani9010019

Acknowledgement

Supported by : Rural Development Administration (RDA)