The effect of supplement on the grazing behaviour and performances of sheep on mature rangeland in Tunisia

A. Bouazizi; A. Majdoub; S. Bel Hadj

The effect of supplement on the grazing behaviour and performances of sheep on mature rangeland in Tunisia

In: Livestock production and climatic uncertainty in the Mediterranean

Authors:

A. Bouazizi

A. Bouazizi Institut National Agronomique de Tunisie, 43, Avenue Charles Nicole 1082 Tunis Mahrajène Tunisia

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A. Majdoub

A. Majdoub Institut National Agronomique de Tunisie, 43, Avenue Charles Nicole 1082 Tunis Mahrajène Tunisia

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, and

S. Bel Hadj

S. Bel Hadj Institut National Agronomique de Tunisie, 43, Avenue Charles Nicole 1082 Tunis Mahrajène Tunisia

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Type:: Chapter

Pages:: 149–155

DOI:: https://doi.org/10.1163/9789004683785_021

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Summary

Under Tunisian conditions and with advancing grazing season, the nutritive value of herbaceous range vegetation becomes too low to support animal production. This is a study of the effect of using a liquid supplement as a source of energy, protein, minerals and vitamins on both animal performances and on the preservation of the vegetation cover. In the experiment 84 females lambs of the “Noire de Thibar” breed, of average age eight months and weighing on the average 22 ± 1.5 Kg were allotted to six similar groups based on liveweight (LW). Three groups of animals had free access to the rotating feeding wheel units filled with a 90% sugar beet molasses, 5% urea and 5% mineral+vitamins liquid supplement mixture. The analysed data showed the following: Mean botanical composition was 42, 35.6, 18.5 and 6% for other Herbaceous (OH), perennial grass (PG) annual grass (AG) and legumes respectively. This available vegetation has 5.5, 5.1 and 35.6% CP, ash and ADF content respectively.

The supplement did not affect the disappearance of the vegetation (53 and 55%). However available LE and PG species showed a decline of 1.5 and 8.3% respectively while OH and AG species increased 4.2 and 5.5% respectively. The supplement favoured PG and LE intake while OH and AG intake was decreased. DM content of the grazing diet was higher for the supplemented than the control animals (88.4 vs 81.2%)

The supplement did not affect the grazing parameters: resting time, walking time and total feeding time: all these were similar for both treatment (29.2, 10.7 and 60.1 % for the supplemented vs 26.5, 12.0 and 61.5% respectively for the control animals).

The supplement affected the DM intake and the nutritive value of the ingested diet and led to better live weight gains (22.6 Kg / ha and 6.7 Kg / ha for the supplemented and the control animals respectively) and better net return (70.9 TD vs 22.0 TD).

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Livestock production and climatic uncertainty in the Mediterranean

Proceedings of the joint ANPA-EAAP-CIHEAM-FAO Symposium, Agadir, Morocco, 22-24-October 1998

E-Book ISBN:: 9789004683785

Publisher:: Wageningen Academic

Print Publication Date:: 01 Jan 2000

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- Life Sciences
  - General
  - Animal & Veterinary

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The effect of supplement on the grazing behaviour and performances of sheep on mature rangeland in Tunisia

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Citation Info

Share link with colleague or librarian

Livestock production and climatic uncertainty in the Mediterranean

Proceedings of the joint ANPA-EAAP-CIHEAM-FAO Symposium, Agadir, Morocco, 22-24-October 1998

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