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This experiment was conducted to determine apparent and true amino acid digestibilities of untreated (BPS), heat-treated (HBPS) and thermal-ammoniated (NH3BPS) high-tannin sorghum with pigs both intact and with an ileo-rectal anastomosis (IRA). The mean endogenous protein secretion for the surgically modified (12,1 g CP /d) and normal pigs (5,8 g CP / d) differed significantly (P ",;;;0,01). A net synthesis of isoleucine, lysine and methionine was observed in the large intestines of normal pigs fed the sorghum diets. In general, the mean apparent and true faecal and ileal digestibilities of amino acids (AA) were the highest for NH3BPS, followed by HBPS and BPS. Thermal ammoniation improved the true ileal digestibility (as measured with IRA pigs) of arginine (28,3%), methionine (22,9%), valine (42,8%), histidine (22,9%), isoleucine (8,8%), lysine (27,3%), phenylalanine (27,3%), threonine (24,6%), serine (17,0%) and tyrosine (6,9%). Although ammoniation improved AA digestibility, the improvements were too small to be of practical importance.'n Eksperiment is uitgevoer om die skynbare en ware aminosuurverteerbaarheidswaardes vir onbehandelde (BPS), hittebehandelde (HBPS) en geammonifiseerde (NH3BPS) voelbestande graansorghum met norm ale en ileum-rektumanastomose- gemodifiseerde (IRA) varke te bepaal. Die hoeveelheid endogene N uitgeskei deur normale diere (5,8 g RP / d) was hoogsbetekenisvol (P ",;;;0,01) laer as die hoeveelheid uitgeskei deur gemodifiseerde diere (12,1 g RP/d). 'n Netto sintese van isoleusien, lisien en metionien het plaasgevind in die dikderms van die normale varke. Gor die algemeen was die skynbare en ware fekale en ileale verteerbaarheid van aminosure die hoogste met die NH3BPS-dieet, gevolg deur die HBPS- en BPS-diete. Termiese ammonifisering het 'n verhoging meegebring in die ware ileale verteerbaarheid (soos bepaal met die gemodifiseerde diere) van arginien (28,3%), metionien (22,9%), valien (42,8%), histidien (22,9%), isoleusien (8,8%), lisien (27,3%), fenielalanien (27,3%), treonien (24,6%), serien (17,0%) en tirosien (6,9%). Alhoewel aminosuurverteerbaarheid verhoog is, was die verbetering egter te klein om van enige praktiese belang te wees.Keywords: Amino acids, ammonia, digestibility, endogenous excretion, heat, ileo-rectal anastomosis, ileum, nitrogen, sorghum.

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A study was conducted to describe the changes occurring in body composition of ostriches over a 285-day growth period. Fifty two birds were given a choice of four diets with different protein (180 and 120 g/kg feed) and energy (8.5 and 13.5 MJ ME/kg feed) levels, on the assumption that the birds would select from the four feeds according to their protein and energy requirements, and thereby grow close to their potential without being constrained by the quality of feed supplied to them. Birds were weighed at approximately 10-day intervals and randomly selected birds were slaughtered at 1, 54, 120, 162 and 285 days of age respectively. Proximate analyses were done on the complete empty carcasses and the components were expressed as a percentage of live weight at the different slaughter ages. The Gompertz growth curve was fitted to the live weights of the birds and to the weights of the individual chemical components. The change in body weight with age as the only independent variable can be considered as a good (R2 = 0.93) description of growth in ostriches. The growth parameters a, b and c were estimated as 119.4, 0.009 and 156.3respectively. Body protein and moisture concentrations decreased as the birds aged, while the body ash concentration remained relatively constant and body fat concentration increased. Fitted Gompertz parameters for the different chemical components were, for fat; a = 33.6, b = 0.013 and c = 143.4 (R2 = 0.914), protein; a = 44.5, b = 0.015 and c = 113.9 (R2 = 0.961), ash; a = 10.3, b = 0.016 and c = 118.2 (R2 = 0.965), and moisture; a = 55.0, b = 0.014 and c = 116.9 (R2 = 0.965). Similar to other animals, fat was a late maturing tissue and protein a relatively early maturing tissue. These results are important in describing the growingostrich and this information can be used to model the nutrient requirements of these birds.Keywords: Growth, development, feeding optimization, proportional changes, Gompertz growth curve