Effects of dietary energy density and lysine:calorie ratio on the growth performance of growing pigs and subsequent finishing performance

One hundred twenty crossbred gilts were used in a growth trial to evaluate the effects of increasing dietary energy density and lysine:calorie ratio on growing pig growth performance and subsequent finishing performance. Feeding 3% choice white grease and 3.45 g lysine:Mcal ME maximized growth performance of growing gilts. Choice white grease additions and increasing lysine:calorie ratio during growing (65 to 160 lb) did not affect carcass back fat or loin depth at 235 lb

Effects of low-protein, amino acid- fortified diets, formulated on a net energy basis, on the growth performance and carcass characteristics of finishing pigs

Two hundred eighty-eight gilts were used to determine the effects of corn-soybean meal or low-protein, amino acid-fortified diets, formulated on a net energy (NE) basis on growth perforn1ance and carcass characteristics. Pigs fed high NE grew faster from 105 to 165 lb. However, pigs fed diets with intact protein grew faster and more efficiently during the finishing period and for the entire trial than those fed low protein, amino acidfortified diets. Carcass data revealed that pigs consuming high NE were fatter and had lower percentage lean than pigs consuming low NE. Additionally, longissimus muscle area tended to be greater in pigs fed diets containing intact protein than pigs fed low protein, amino acid-supplemented diets. Based on these results, pigs fed low protein, amino acid-fortified diets had poorer ADG, feed efficiency, and carcass leanness than those fed diets with intact protein, regardless of NE

Influence of added zinc from zinc sulfate on weanling pig growth performance and plasma zinc concentration

A total of288 weanling pigs (13.4lb and 18 d of age) was used in a 27 d growth assay to determine the effects of adding Zn from ZnS04 or ZnO on growth performance. Pigs were allotted to one of eight dietary treatments consisting of a control diet; diets containing one of six concentrations of Zn from ZnS04 (SOD, 1,000, 1,500,2,000,2,500, or 3,000 ppm); and a diet containing 3,000 ppm of Zn from ZnO. Increasing Zn from ZnS04 linearly improved ADO and FlO from d 9 to 19; however, adding ZnS04 to the diet decreased ADO from d 19 to 33. Thus, pigs fed diets containing ZnS04 or 3,000 ppm of Zn from ZnO had similar growth performance compared to pigs fed the control diet for the overall trial. In conclusion, no benefit was observed for the overall trial from adding increasing concentrations of Zn from ZnS04 or 3,000 ppm ofZn from ZnO

Apparent ileal digestiblity of amino acids and digestible and metabolizable energy valves for conventional soybean meal or dry extruded-expelled soybean meal for swine

We conducted two experiments to determine the apparent ileal digestibility of amino acids and digestible energy (DE) and metabolizable energy (ME) values for conventionally processed, solvent-extracted soybean meal (SBM) compared to dry-extruded-expelled SBM with or without soy hulls. Apparent ileal digestibility of crude protein and lysine and DE and ME values were greater in either extruded-expelled SBM compared to the conventionally processed SBM. No differences occurred in apparent digestibility of amino acids or energy values between extruded-expelled SBM with hulls and that without hulls. These results suggest that the dry extrusion followed by expeller processing of soybeans results in a SBM with slightly greater digestibility of crude protein and lysine as well as greater DE and ME values con1pared to conventionally processed, solvent-extracted SBM

Effects of modified tall oil on growth and body composition in adult ovariectomized rats

A trial was conducted to evaluate the effects of modified tall oil (MTO) on growth and body composition of adult ovariectomized rats. This trial was targeted as a model for postmenopausal women; thus, only data applicable to swine production are presented herein. Feeding MTO decreased adiposity, increased concentrations of certain lipids in tissues, increased vitamin E (octocopherol) levels in the adipose, and increased actual lean content. These data lend support to the carcass leanness and meat quality improvements routinely seen in swine from feeding MTO