Thesis (MScAgric (Animal Sciences))--University of Stellenbosch, 2010. / ENGLISH ABSTRACT: The aim of this study was to investigate the effect of feedlot production on the growth and carcass
characteristics, as well as the distribution of the main tissues (muscle, fat and bone) and meat quality of
Merino, South African Mutton Merino (SAMM) and Dorper lambs.
The Merino and SAMM 2008 outperformed (P<0.05) the 2007 SAMM and both Dorper production groups in
terms of average daily gain, while the Merino and both SAMM production groups achieved the best feed
conversion ratio (P<0.05). The highest percentage A2 graded carcasses was achieved after 42 days under
feedlot conditions by the Merino and both Dorper production groups, but it took only 21 days in the feedlot for
the SAMM lambs to achieve the same result.
Slaughter weight, carcass weight and dressing percentage all increased significantly with an increase in the
number of days under feedlot conditions for all three breeds, while a decrease in the percentage head,
trotters and red offal was also documented. The fatter retail cuts (thick rib, flank, prime rib and loin)
increased (P<0.05) in percentage with an increase in the number of days under feedlot conditions. A
significant decrease in the percentage leaner retail cuts (raised shoulder and hind-quarters) was found when
the amount of days under feedlot conditions increased. The highest profit is obtained by the prime rib, loin
and hind-quarters in a lamb carcass. For the Merino and Dorper lambs these three cuts, or a combination of
the three showed the highest combined percentages after 42 and 63 days under feedlot conditions,
respectively. The late maturing SAMM lambs achieved the highest percentages for these three cuts after 63
and 84 days under feedlot conditions in 2007 and 2008 respectively.
Visceral and renal fat deposition increased throughout the production period for all breeds. The Dorper
lambs attained the highest subcutaneous fat depth, and also produced the heaviest, but fattest carcasses.
For A2-graded carcasses, Dorper lambs had the highest dressing percentage and lowest subcutaneous fat
depth, followed by the SAMM and then Merino breed. A decrease in the percentage muscle and bone was
found with an increase in the number of days under feedlot conditions, whilst an increase in the percentage
fat was found under the same conditions.
Meat quality was mostly affected by the 48h post mortem pH. This pH value is affected by the cooling rate of
the carcasses, which in turn is affected by the level of carcass fatness. Carcass fatness increased with an
increase in the number of days under feedlot conditions, resulting in a low 48h post mortem pH. A low 48h
post mortem pH is accompanied by higher percentages of cooking and drip loss, as well as a high a*-colour
reading for all three breeds. / AFRIKAANSE OPSOMMING: Die doel van hierdie studie was om die effek van voerkraalproduksie op die groeivermoë, karkaseienskappe,
verspreiding van spier, been en vet, en vleiskwaliteit van Merino, Suid-Afrikaanse Vleismerino
(SAVM) en Dorperlammers te bepaal.
Die Merino en SAVM 2008 produksiegroepe het hoër (P<0.05) gemiddelde daaglikse toenames getoon as
die SAVM 2007 en beide Dorper groepe, terwyl die Merino en beide SAVM produksiegroepe die beste
voeromset verhoudings bereik het (P<0.05). Die hoogste persentasie A2 gegradeerde karkasse is na 42
dae in die voerkraal deur die Merino en beide Dorper produksiegroepe geproduseer, terwyl dit slegs 21 dae
onder dieselfde toestande vir die SAVM groepe geneem het om dieselfde resultaat te lewer.
Daar is ‘n betekenisvolle verhoging in slagmassa, karkasmassa en uitslagpersentasie vir al drie die rasse
gevind met ‘n toename in die aantal dae in die voerkraal, terwyl ‘n afname in die persentasie kop, pote en
haarslag gevind was. Die persentasie vetter groothandelsnitte (dikrib, dunrib, ribtjop en lendesnit) het
toegeneem (P<0.05) met ‘n toename in die aantal dae in die voerkraal. ‘n Betekenisvolle afname in die
persentasie van die maerder groothandelsnitte (blad en boude) is gevind met ‘n toename in die aantal
produksie dae in die voerkraal. Die hoogste inkomste van ‘n lamkarkas is afkomstige van die ribtjop, lende
snit en boude. ‘n Kombinasie van hierdie drie snitte was die hoogste vir die lammers van die Merino en
beide Dorper groepe na 42 en 63 dae in die voerkraal onderskeidelik. Die laat volwasse SAVM lammers het
die hoogste persentasie van hierdie drie snitte bereik na 63 en 84 dae in die voerkraal vir die SAVM 2007 en
SAVM 2008 onderskeidelik.
Die neerlegging van pensvet en niervet het voortdurend toegeneem deur die produksieperiode vir al drie
rasse. Die Dorperlammers het die hoogste onderhuidse vetneerlegging getoon, maar het ook die swaarste
en vetste karkasse geproduseer. Dorperlammers het die hoogste uitslagpersentasie en laagste onderhuidse
vetneerlegging vir A2 gegradeerde karkasse gehad, gevolg deur die SAVM en Merino. ‘n Afname in die
persentasie spier en been in karkasse is waargeneem namate die lammers langer in die voerkraal was,
terwyl ‘n toename in die persentasie vet onder dieselfde omstandighede waargeneem is.
Die 48h post mortem karkas pH affekteer die meeste vleiskwaliteit eienskappe. Hierdie pH waarde word
weer deur die tempo van karkasafkoeling beϊnvloed, wat op sy beurt deur die vetheidsgraad van die karkas
bepaal word. Die vetheid van karkasse het toegeneem met ‘n toename in die aantal dae in die voerkraal,
wat ‘n lae pH waarde 48h post mortem tot gevolg gehad het. ‘n Lae 48h post mortem pH waarde het gelei
tot hoër persentasies kook- en dripverliese en hoë a* kleurlesings vir al drie rasse.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:sun/oai:scholar.sun.ac.za:10019.1/4331 |
| Date | 03 1900 |
| Creators | Van der Westhuizen, E. J. |
| Contributors | Brand, T. S., Hoffman, L. C., Cloete, J. J. E., University of Stellenbosch. Faculty of Agrisciences. Dept. of Animal Sciences. |
| Publisher | Stellenbosch : University of Stellenbosch |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | Unknown |
| Type | Thesis |
| Format | 105 p. : ill. |
| Rights | University of Stellenbosch |
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