•  
  •  
 

Keywords

finishing pig, growth performance, xylanase

Abstract

A total of 1,944 mixed sex growing-finishing pigs (PIC; 337 × 1050; initial BW of 49.9 ± 1.18 lb) were used in a 131-d growth trial to determine the effects of increasing added xylanase on grow-finish pig growth performance and carcass characteristics. Pens were assigned to 1 of 6 treatments in a randomized complete block design with BW as a blocking factor. There were 12 replicate pens per treatment and 27 pigs per pen. The experimental diets were corn-soybean meal-based and were fed in 5 phases. The 6 dietary treatments were formulated to: 0, 2.3, 4.5, 9.1, 18.1, and 34.0 of enzymatic activity for xylanase (SXU)/lb (0, 5, 10, 20, 40, and 75 SXU/kg) of added xylanase (Belfeed B 1100 MP; Jefo Nutrition, Inc., Saint-Hyacinthe, Quebec). From d 0 to 70, there was a tendency (quadratic, P = 0.068) for average daily gain (ADG) to decrease and then increase with increasing added xylanase, but there was no evidence (P > 0.10) of differences for average daily feed intake (ADFI) and feed efficiency (F/G). From d 70 to 131 and overall, there was no evidence of difference (P > 0.10) observed for ADG, ADFI, and F/G. There was no evidence for difference (P > 0.10) between treatments for number of pigs receiving injectable treatments or mortalities. For carcass traits, increasing xylanase increased then decreased (quadratic, P = 0.010) percentage carcass yield. Also, as xylanase increased, percentage lean decreased (linear, P = 0.038) and backfat marginally increased (linear, P = 0.066). Economically, feed cost and feed cost/lb of gain increased (linear, P ≤ 0.05) and income over feed cost (IOFC) decreased (linear, P ≤ 0.05) as the concentration of xylanase increased in the diets. In conclusion, added xylanase in the diet did not impact growth performance or mortality but did improve carcass yield at intermediate levels.

Creative Commons License

Creative Commons Attribution 4.0 License
This work is licensed under a Creative Commons Attribution 4.0 License.

Share

COinS