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927
Effect of timing of post-weaning supplementation of xylanase on growth performance, nutrient digestibility and fecal microbial composition in weanling pigs

Wednesday, July 20, 2016: 9:30 AM
Grand Ballroom F (Salt Palace Convention Center)
Hang Lu , Purdue University, West Lafayette, IN
Hui Yan , Purdue University, West Lafayette, IN
Helen MaseyONeill , AB Vista Feed Ingredients, Marlborough,, United Kingdom
C. L. Bradley , AB Vista, Marlborough, United Kingdom
Mike Bedford , AB Vista Feed Ingredients,, Marlborough, United Kingdom
P. Wilcock , AB Vista, Marlborough, United Kingdom
Cindy Nakatsu , Purdue University, West Lafayette, IN
O. Adeola , Purdue University, West Lafayette, IN
Kolapo M Ajuwon , Department of Animal Sciences, Purdue University, West Lafayette, IN
Abstract Text:

The study was conducted to investigate the effect of timing of xylanase (Econase XT) supplementation to weanling pigs fed a corn-soybean meal based diet, and its effect on growth performance, nutrient digestibility and gut microbial composition. A total of 128 weanling pigs ([Hampshire × Duroc] × [Yorkshire × Landrace]; barrows: gilts = 1:1; 6.2 ± 0.6 kg BW; weaning age: 21 d) were randomly assigned to 4 treatments, 8 replicate pens with 4 pigs per pen based on their BW at weaning. The 4 treatments were a combination of 2 dietary treatments (Xylanase added at 0 or 16,000 BXU/kg) and 2 feeding time points [period 1 (d 0-14) and period 2 (d 14-42)]. Treatments were; xylanase-xylanase, xylanase-control, control-xylanase and control-control. The study lasted 42 d with a 3-phase feeding program: d 0 to 14, d 14 to 28 and d 28 to 42. Chromic oxide marker was included in the diets at 0.5% from day 28. BW and feed intake were recorded every two weeks. On d 41, fecal samples were collected from each pig for determination of microflora diversity and apparent total tract nutrient digestibility (ATTD). Ileal digesta were also collected on d 42, for determination of apparent ileal nutrient digestibility (AID).  From d 0-14, pigs had lower BW, ADG and feed efficiency when xylanase was included in the diets. The final BW and overall ADG was higher (P < 0.05) when xylanase was supplied from d 14 compared with that from d 0. The AID and ATTD of DM, energy, N and phosphorus was increased (P < 0.05) by xylanase and not impacted by timing of xylanase inclusion. The overall bacterial community structure was not influenced by different treatments. However, xylanase significantly decreased (P < 0.05) Veillonellaceae and tended to decrease (P < 0.08) Megasphaera abundance in period 2 compared to the control group. Therefore, timing of xylanase inclusion in weanling pig diets has an effect on performance in the nursery.

Keywords: Key words: weaning pigs, xylanase, digestibility, gut microbial profile