title: Evaluation of dry feeding and liquid feeding to lactating sows under high temperature environment.
abstract: BACKGROUND
  Liquid feeding system has been introduced to domestic swine farms, but negative cognition about liquid feeding system has been remained for feed waste decay related with poor management and microbial contamination. For these reasons, this study was conducted to evaluate the effects of feeding method in lactating sows.
  
  
  METHODS
  A total of 30 mixed-parity (average 4.13) lactating sows (Yorkshire × Landrace) with an initial BW of 218.8 ± 19.5kg was used in a 3 week trial. Sows were allotted to 1 of 2 treatments in a completely randomized design by their body weight, backfat thickness, parity and alive litter weight. One of treatments was dry feeding and the other was liquid feeding (water to feed ratio, 1:1). Experimental diets contained 3265 kcal ME/kg, 12.6 % CP, 5.76 % EE, 1.09 % total lysine, 0.25 % total methionine, as fed basis.
  
  
  RESULTS
  Dry feeding treatment had high body weight loss rather than liquid feeding treatment (P= 0.04). Dry feeding treatment had tendency to increase litter weight at 21d of lactation (P= 0.06) and litter weight gain (P= 0.04) during lactation period (0-3 week). Sows fed dry feeding method made milk containing high content of casein and total solid rather than sows fed liquid feeding method (P= 0.04). In addition, dry feeding treatment had tendency to higher content of milk fat, protein and solid not fat on 21d of lactation (P= 0.07). Sows fed dry feeding type also showed higher milk energy content in milk of 21d lactation (P= 0.05). Furthermore, liquid feeding treatment showed high occurrence in feed waste during lactation period (P< 0.01).
  
  
  CONCLUSIONS
  Dry feeding method was more suitable feeding method to lactating sows under high temperature environment like lactating barn.
authors: School of Agricultural Biotechnology, Seoul National University, Seoul, Korea.
authors: J S
authors: JS
authors: Hong
authors: School of Agricultural Biotechnology, Seoul National University, Seoul, Korea.
authors: S S
authors: SS
authors: Jin
authors: School of Agricultural Biotechnology, Seoul National University, Seoul, Korea.
authors: S W
authors: SW
authors: Jung
authors: School of Agricultural Biotechnology, Seoul National University, Seoul, Korea.
authors: L H
authors: LH
authors: Fang
authors: School of Agricultural Biotechnology, Seoul National University, Seoul, Korea.
authors: Y Y
authors: YY
authors: Kim
keywords: Dry feeding; High temperature environment; Lactating sow; Liquid feeding; Piglet