The effects of immunocastration and dried distillers grains with solubles withdrawal on growth performance, carcass characteristics, fatty acid analysis, and iodine value of pork fat depots (2012)

Authors

M D. Asmus
Michael D. Tokach
Jim L. Nelssen
Robert D. Goodband
Joel M. DeRouchey
Steven S. Dritz

Keywords

Kansas Agricultural Experiment Station contribution; no. 13-026-S; Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service); 1074; Swine; DDGS; Improvest; Finishing pig; Withdrawal

Abstract

A total of 1,360 pigs (PIC 337 × 1050, initially 53.0 lb) were used in a 125-d study to determine the effects of dried distillers grains with solubles (DDGS) withdrawal post-immunocastration (IC; Improvest, Pfizer Animal Health, Kalamazoo, MI) on growth performance and carcass fat quality of growing-finishing pigs. Pens of pigs were randomly allotted by initial weight and gender (barrows or IC) to 1 of 3 dietary treatments with 8 replications per treatment for a total of 48 pens with 27 to 29 pigs per pen. Treatments were arranged in a 2 × 3 factorial with the main effects of gender (barrow or IC) and diet (0% DDGS throughout, 30% DDGS throughout, or 30% DDGS through d 75 then withdrawn to 0% to d 125). Boars were injected with Improvest on d 39 and 74 of the study. Dietary treatments were corn-soybean meal— based diets and fed in 5 phases. No gender × diet interactions (P>0.18) were observed except for a tendency for F/G (P<0.07) during the second phase (d 25 to 53), when 1 of the 2 barrow groups fed 30% DDGS had an increase in ADFI resulting in poorer F/G. For the entire period before the second Improvest injection (d 0 to 74), barrows tended (P<0.08) to have increased ADG (1.98 vs. 1.95 lb) and increased (P<0.001) ADFI (4.32 vs. 3.91 lb) but were less efficient (P<0.001) than boars (2.19 vs. 2.01). During the same time period, pigs fed 30% DDGS had reduced (P<0.002) ADG and poorer feed efficiency.; Swine Day, Manhattan, KS, November 15, 2012

Recommended Citation

Asmus, M D.; Tokach, Michael D.; Nelssen, Jim L.; Goodband, Robert D.; DeRouchey, Joel M.; and Dritz, Steven S. (2012) "The effects of immunocastration and dried distillers grains with solubles withdrawal on growth performance, carcass characteristics, fatty acid analysis, and iodine value of pork fat depots (2012)," Kansas Agricultural Experiment Station Research Reports: Vol. 0: Iss. 10. https://doi.org/10.4148/2378-5977.7087