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Dorpernuus • Dorper news 2012 32
Table 6. The changes in the body weight, eye muscle area and fat thickness of the M. longissimus dorsi (± s.e.) of the four groups abc Values in the same column with the same superscript differ significantly (P< 0.05) Figure 1. Body weight at different ages Figure 3. Fat depth at different ages Figure 2. Eye muscle area at different ages CONCLUSION It is evident from the results that compensatory growth occurred in lambs when they are switched from a low to a higher feeding level. Furthermore, this compensatory growth will result in more muscle tissue being developed than fat due to an increase in protein deposits. Irrespective of feeding level, the differences in M. longissimus dorsi area between groups decreased towards the end of the experimental period. However, lambs reared on the higher feeding level early in life, retained their advantage over those lambs reared on a lower feeding level. The effect of improved feeding regime on fat depth was more pronounced than the effect on M. longissimus dorsi area. REFERENCE Acocks, J.P.H., 1988. Veld types of South Africa. Memoirs of the Botanical survey of South Africa, 57, 1-146. Pretoria: Government Printers. Atti, N. & Ben Salem, H., 2008. Compensatory growth and carcass composition of Barbarine lambs receiving different levels of feeding with partial replacement of the concentrate with feed blocks. Animal Feed Science and Technology, 147, 265-277. Marais, P.G., Van der Merwe, H.J. & Du Toit, J.E.J, 1991. The effect of compensatory growth on feed intake, growth rate, body composition and efficiency of feed utilization in Dorper sheep. S. Afr. J. Anim. Sci., 21, 80-88. Meissner, H.H., Hofmeyr, H.S. & ROUX, C.Z., 1977. Similar efficiency at two feeding levels in sheep. S. Afr. J. Anim. Sci., 7, 7-15. Olivier, W.J. & Olivier, J.J., 2005. Effect of feeding stress on the wool production of strong and fine wool Merino sheep. S. Afr. J. Anim. Sci. 35, 273-281 SAS, 2009. SAS OnlineDoc® 9.2. Cary, NC, SAS Institute Inc Thompson, E.F., Bickel, H. & Schürch, A., 1982. Growth performance and metabolic changes in lambs and steers after mild nutritional resrricrion. J. Agric. Sci. Camb., 98, 183-194. 33 Dorpernuus • Dorper news 2012
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