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South African Journal of Animal Science

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Invloed van mielieaanvulling en weidruk op produksie van ooie en lammers op wintersuurveld

W P Henning, H H Barnard

Abstract


Influence or maize supplementation and stocking rate on production or ewes and lambs on winter sourveld. Body mass changes of lactating ewes and lambs with different types of maize supplements on winter sourveld were investigated over three consecutive seasons in a 3 X 2 X 2 factorial experimental design. Camps were grazed for 60 days in June to August at either 3 or 6 kg available DM/ewe/d. Maize grain at 300 g and cob and com at 350 g/ewe/d were supplied to ewes. A protein energy lick was also supplied to ewes whilst creep feed was available to lambs. The effect of manipulating rumen fermentation by means of these energy supplements was also investigated in a digestion trial with 12 rumen-fistulated wethers. Rumen pH, intake and digestibility were the main parameters investigated. Caustic soda treatment of the energy supplements increased the rumen pH from 6,1 to 6,3 (P ≤ 0,01). Supplementation with cob and com (6,3) and maize grain (6,2) also resulted in a higher (P ≤ 0,01) rumen pH compared with no maize supplementation (6,1). Significant differences in grass intake (764 ± 17 g), DM digestibility (58,7 ± 0,8%) and fibre digestibility (61,1 ± 1%) were not recorded. Caustic soda treatment of the energy supplements resulted in a 15% (P ≤ 0,01) decrease in creep feed intake by lambs. Lambs maintained a higher ADO (P :s;;0,01) when ewes recieved energy supplementation (161 and 153 vs. 136 g). The loss in body mass by ewes tended to be lower (77 vs. 87 g/d) at the higher herbage availability (6 kg DM). Caustic soda treatment of energy supplements resulted in a 15% (P ≤ 0,01) reduction in lick intake (162 vs. 191 g/ewe/d) without affecting the loss in body mass (82 ± 4,3 g/ewe/d).

Massaveranderinge van ooie en lammers met verskillende tipe energieaanvullings op gespaarde wintersuurveld is vir drie opeenvolgende winterseisoene ondersoek in 'n 3 X 2 X 2-faktoriale proefontwerp. Veldkampe is vir 60 dae in Junie tot Augustus bewei teen 3 of 6 kg beskikbare DM/ooi/d. Mieliegraan teen 300 g en mieliekoppe teen 350 g/ ooi/ d is aan lammerooie voorsien. 'n Prote'ien-energielek is ook aan ooie voorsien terwyl kruipvoer aan lammers beskikbaar was. Die invloed van die manipulasie van rumenfermentasie met behulp van hierdie energieaanvullings is ook in 'n verteringstudie met 12 rumen-fistelhamels ondersoek. Rumen-pH, inname en verteerbaarheid was die hoof parameters wat ondersoek is. Bytsodabehandeling van energieaanvullings het die rumen-pH van 6,1 na 6,3 verhoog (P ≤0,01). Aanvulling met koppe (6,3) en mielies (6,2) het ook 'n hoer (P ≤ 0,01) rumen-pH tot gevolg gehad teenoor geen mielieaanvulling (6,1). Geen betekenisvolle verskille in grasinname (764 ± 17 g), DM-verteerbaarheid (58,7 ± 0,8%) en veselverteerbaarheid (61,1 ± 1%) is gevind nie. Bytsodabehandeling van die energieaanvullings het 15% minder (P ≤ 0,01) kruipvoerinname deur lammers tot gevolg gehad. Lammers het 'n hoer GDT gehandhaaf waar ooie energieaanvulling ontvang het (161 en 153 vs. 136 g). Liggaamsverliese van ooie het geneig om laer (77 vs. 87 g/d) te wees by die hoer (6 kg) DM-beskikbaarheid. Bytsodabehandeling van die energieaanvullings het 'n 15% (P ≤ 0,01) afname in lekinname (162 vs. 191 g/ooi/d) teweeg gebring sonder om massaverliese te be'invloed (82 ± 4,3 g/ooi/d). 

keywords: Whole maize, Winter Sourveld, supplementation, sheep.




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