Document Type

Dissertation - University Access Only

Award Date

2003

Degree Name

Doctor of Philosophy (PhD)

Department / School

Animal Science

First Advisor

Robbi Pritchard

Abstract

Two studies were conducted to determine the use of soybean hulls as a replacement for com in receiving/ realimentation diets. The first study was designed to determine the effects of a starch-based (HS; com) compared to a fiber-based (HF; soybean hulls) diet ( 15% CP) on 14 d realimentation performance of transit stressed lambs. All lambs were subjected to 48 h of feed deprivation. Lambs consuming the HS diet and a group of lambs consuming the HF diet were subjected to 10 h of transit (S), while a second group of HF lambs were not transported (NS). Gain performance was not different (P > 0.15) between treatments. Nitrogen digestibility was higher (P < 0.05) for SHS lambs compared to SHF lambs, and was not different (P >0.10) between HF treatments. Cumulative nitrogen retention was greater (P < 0.05) for SHS lambs compared to SHF lambs, but not different (P > 0.10) between HF treatments. Glucose concentrations tended (P < 0.15) to be higher for SHS compared to SHF during d 7 and 14 ofrealimentation, while NEFA concentrations were higher (P < 0.05) for SHF during d 2 and 3 of realimentation. The second study was designed to determine the influence of soybean hulls compared to rolled com on gain performance and blood metabolites in newly received feedlot steers. Newly arrived Angus steers (n = 174) were randomly assigned to one of three receiving diets for 59 d. Oat silage-based diets (11.75% CP) consisted of: 1) rolled com (RC) and soybean meal (HS), 2) soybean hulls (SBH) and soybean meal (HF-SB), and 3) soybean hulls and dried com gluten feed (HF-Z). Steers consuming the HF diets had greater (P < 0.05) DM and estimated M E intake during the first 28 d, but ADG and gain:feed ratio was not different (P > 0.10). Cumulatively, no differences were detected for MEI, ADG or gain:feed ratio over the 59 d feeding period. Estimated net energy values, calculated from performance and intake were similar between SBH and RC (P > 0.10). Blood chemistry showed that HF-Z increased glucose levels (P < 0.05) compared to HF-SB on d 28 and 59, but neither were different (P > 0.10) from HS. The HS steers had higher (P < 0.05) NEF A levels compared to HF- SB on d 28, but neither was different (P > 0.10) from HF-Z. Steers consuming the HF-SB diet had higher PUN levels compared to HS on d 7, but were similar at all other times. Based on gain performance, soybean hulls are a viable replacement for com in receiving / realimentation diets. Soybeans should be used with caution on ruminants with marginal or inadequate nitrogen or glucose status.

Library of Congress Subject Headings

Ruminants -- Feeding and feeds.
Ruminants -- Effect of stress on.
Soybean as feed.
Corn as feed.

Publisher

South Dakota State University

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Rights Statement

In Copyright