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Supplementation of maize stover for Ethiopian Menz sheep: effects of cottonseed, noug (Guizotia abyssinica) or sunflower cake with or without maize on the intake, growth, apparent digestibility, nitrogen balance and excretion of purine derivatives

Published online by Cambridge University Press:  25 May 2016

P. O. Osuji ,
S. Sibanda  and
I. V. Nsahlai
P. O. Osuji
Affiliation:
International Livestock Centre for Africa, PO Box 5689, Addis Ababa, Ethiopia
S. Sibanda
Affiliation:
International Livestock Centre for Africa, PO Box 5689, Addis Ababa, Ethiopia
I. V. Nsahlai
Affiliation:
International Livestock Centre for Africa, PO Box 5689, Addis Ababa, Ethiopia
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Abstract

Thirty-six male Ethiopian Menz sheep (9 to 22 months old, average live weight 15·8 (s.d. 1·84) kg), given maize stover (1·5 times ad libitum) supplemented with either 75 g cottonseed cake (CSC), 114 g noug cake (NGC; Guizotia abyssinica) or 112 g sunflower cake (SFC) with or without maize grain, were used in an 88-day study comprising growth and balance trials. The trials were undertaken according to a randomized-block design with a 2 × 3 factorial arrangement.

There were no significant interactions (P > 0·05). Sheep consumed significantly more stover when supplemented with CSC compared with NGC and SFC (P < 0·05). Maize grain significantly increased organic matter intake (P < 0·001). Although CSC tended to support lower live-weight gains, the effect of protein was not significant. Maize grain increased live-weight gains (P < 0·01).

Urinary nitrogen (N) excretions were similar between CSC and SFC but about 0·22 higher with NGC (P > 0·05). The faecal N output was 0·33 (P < 0·01) and 0·18 (P < 0·05) higher with CSC than with NGC and SFC respectively. Maize grain had no effect on any of the N-balance measurements.

Cottonseed cake supported lower daily production of purine derivatives (PD) (P < 0·01), microbial purine (P < 0·01) and microbial protein (P < 0·01) than either NGC or SFC. Maize grain increased the daily excretion of total PD (P < 0·05), microbial purine (P < 0·05) and microbial protein (P < 0·05). Neither the protein source nor maize grain affected the efficiency of microbial protein synthesis. It was concluded that SFC was utilized more effectively both in terms of rumen microbial N synthesis, N retention and growth. The addition of a small amount of energy as crushed maize grain increased microbial N synthesis, N retention and live-weight gain.

Keywords

maize stovernitrogen balanceoilseed cakespurinessheep
Type
Research Article
Information
Animal Production , Volume 57 , Issue 3 , December 1993 , pp. 429 - 436
Copyright
Copyright © British Society of Animal Science 1993

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